| Entries |
| Document | Title | Date |
|---|
| 20080265815 | HARMONIC PROCESSOR - A harmonic processor receiving an input signal and providing an output signal, the input signal comprising a first analog signal having amplitude, frequency and phase components and being converted to an instantaneous magnitude output signal, or the input signal comprising an instantaneous magnitude signal for inverse conversion to an output analog signal having amplitude, frequency and phase components, comprising a first component comprising a resistive plane, the first component having a first zone and a second zone, the first zone comprising a first set of first electrodes contacting the resistive plane at first defined locations and the second zone comprising a second set of electrodes contacting the resistive plane at second defined locations; the first electrodes comprising a first subset of first electrodes permanently connected to external terminals; and a second subset of first electrodes for connection to external terminals during controlled time periods; the second electrodes comprising a first subset of second electrodes permanently connected to external terminals and a second subset of second electrodes connected to external terminals during controlled time periods; wherein one of the first set of electrodes and second set of electrodes comprises signal injection electrodes and the other of the first set of electrodes and second set of electrodes comprises sensor electrodes; the signal injection electrodes being provided to allow a pattern of bias to be applied to the resistive plane and injecting currents or forcing potential at either the first or second defined locations; the sensor electrodes being provided for sensing a potential on a surface of the resistive plane at the other of the first or second defined locations. | 10-30-2008 |
| 20080290826 | Motor Controller - A motor controller stores values corresponding to predetermined equivalent resistance which corresponds to power loss generated by switching on and off switching elements. Voltage command values are determined by adding voltage drop values determined from values corresponding to the equivalent resistance and values of current flowing in the switching elements to target applied voltage values corresponding to current command values which correspond to target output of a motor. The switching elements arranged in a power supply line to the motor are switched on and off by control signals generated according to the voltage command values. | 11-27-2008 |
| 20080297077 | MOTOR DRIVE CONTROL DEVICE, MOTOR DRIVE CONTROL METHOD AND ELECTRIC POWER STEERING DEVICE USING MOTOR DRIVE CONTROL DEVICE - A motor drive control device includes: a generation part for generating a current command value; a current detection part for detecting a drive current of an electric motor; a motor feedback control part for controlling feedback of the electric motor based on the current command value and a drive current detection value; a prefilter with order of one or more for adjusting the current command value, the prefilter being interposed between the generation part and the motor feedback control part; and a series compensator with order of two or more for determining a voltage command value of the motor feedback control part based on the current command value adjusted by the prefilter and the drive current detection value of the electric motor. | 12-04-2008 |
| 20080297078 | Motor Control Device - A motor control device that controls the driving of a motor having a permanent magnet provided at a rotor has: an angle detector that detects the angle of the rotor by use of an angle sensor; a current detector that detects, as a detected current, the outflow current from or inflow current to a direct-current power source serving as the source for driving the motor; and an angle corrector that corrects the detected angle based on the detected current. The driving of the motor is controlled by use of a corrected angle obtained through the correction by the angle corrector. | 12-04-2008 |
| 20080309265 | Motor Control Device - In a motor control device according to the invention, upon velocity control of a motor, a superimposed signal generating unit | 12-18-2008 |
| 20080309266 | Device for Controlling a Rotating Electrical Machine - A device for determining the position of the rotor of a rotating electrical machine. The invention is characterized in that the device comprises a plurality of magnetic field sensors stationary relative to the stator and adapted to deliver multiphase electric signals representing a magnetic field detected by the sensors, and means for processing the multiphase electric signals by an operator capable of providing diphase signals depending on the position of the rotor. The invention is applicable to rotating electrical machines used in the automotive industry. | 12-18-2008 |
| 20090009111 | Polyphase Rotating Machine Equipped with an Improved Control Device - A machine comprising a rotor, a stator ( | 01-08-2009 |
| 20090015182 | MOTOR CONTROL DEVICE - A motor control device for controlling a d-axis current and a q-axis current on dq coordinates to control a motor, includes a q-axis current command value setting unit which sets a q-axis current command value, an upper limit/lower limit setting unit which sets an upper limit and a lower limit of the q-axis current, a comparing unit which compares the q-axis current command value set by the q-axis current command value setting unit and the upper limit and the lower limit set by the upper limit/lower limit setting unit, a q-axis current command value limiting unit which puts a limit on the q-axis current command value in accordance with a comparison result by the comparing unit, and a d-axis current command value setting unit which sets a d-axis current command value on the basis of the q-axis current command value limited by the q-axis current command value limiting unit. | 01-15-2009 |
| 20090021194 | CONTROL DEVICE - Parameters “n”, “ad”, “pd”, “aq”, “pq” and the like of a motor parameter setting unit | 01-22-2009 |
| 20090021195 | MOTOR CONTROL DEVICE AND MOTOR DRIVE SYSTEM - Let an axis parallel to a magnetic flux produced by a permanent magnet provided on a rotor of a motor be called a d-axis, let an axis leading the d-axis by an electrical angle of 90 degrees be called a q-axis, and let control axes corresponding to the d-axis and the q-axis be called a γ-axis and a δ-axis, respectively. Then, a motor control device performs vector control of the motor with the γ-axis and the δ-axis made different from the d-axis and the q-axis, respectively, and with a motor current passing through the motor broken down into a γ-axis current on the γ-axis and a δ-axis current on the δ-axis. The motor control device has an estimator that estimates, as an estimated magnetic flux, a flux linkage of an armature winding of the motor, or estimates, as an estimated induction voltage, an induction voltage generated by the flux linkage and the rotation of the motor; and a specified current value deriving portion that derives, by using the estimated magnetic flux or the estimated induction voltage, a specified γ-axis current value to be followed by the γ-axis current. | 01-22-2009 |
| 20090021196 | Device for controlling an electromechanical actuator - A device for controlling an electromechanical actuator includes an electric motor and an actuator operated by the electric motor. It also includes a digital signal processor (DSP) providing data of reference voltages (Ud | 01-22-2009 |
| 20090021197 | MOTOR DRIVER - A motor driver according to the invention comprises an energizing unit ( | 01-22-2009 |
| 20090026988 | Motor Control Device - A motor control device includes a motor current detector for detecting motor current flowing in a three-phase motor based on current flowing between an inverter driving the motor and a DC power supply, a specified voltage vector generating portion for generating a specified voltage vector indicating a voltage vector to which an applied voltage to the motor should follow based on a magnetic flux linkage of an armature winding of the motor, a specified voltage vector correcting portion for correcting the generated specified voltage vector, and a magnetic flux estimating portion for estimating the magnetic flux linkage based on the motor current and the specified voltage vector after the correction. The motor control device controls the motor via the inverter in accordance with the specified voltage vector after the correction. | 01-29-2009 |
| 20090026989 | Electromagnetic Suspension Device - In an electromagnetic suspension device comprising one member ( | 01-29-2009 |
| 20090039808 | Motor Control Device And Compressor - A motor control device performing vector control for a motor that drives a load whose load torque varies periodically. The motor control device has: a motor speed deriving portion estimating or detecting a motor speed; a speed controller producing a specified torque current value such that the motor speed is made to follow a specified motor speed value fed from outside; a resonance filter producing a corrected torque current value by receiving a control value that varies with variations in the load torque and emphasizing a periodic variation component of the control value; a torque current corrector producing a specified superimposed torque current value by superimposing the corrected torque current value on the specified torque current value; and an adjusting portion adjusting, based on the specified superimposed torque current value, the phase of the corrected torque value by controlling the resonance filter. The vector control is performed according to the specified superimposed torque current value. | 02-12-2009 |
| 20090058334 | Current Detector Unit And Motor Control Device - A current detector unit has a current detecting portion detecting a current flowing between a three-phase inverter and a direct-current power supply as a detection current; a three-phase current detecting portion for detecting a three-phase current of the inverter based on the detection current; and a judging portion judging, based on the detection current, whether or not a target time point belongs to a period during which the three-phase current can be detected. If the judging portion judges that the target time point belongs to the period, the three-phase current detecting portion detects the three-phase current. | 03-05-2009 |
| 20090058335 | CONTROL SYSTEM FOR BEARINGLESS MOTOR-GENERATOR - A control system for an electromagnetic rotary drive for bearingless motor-generators comprises a winding configuration comprising a plurality of individual pole pairs through which phase current flows, each phase current producing both a lateral force and a torque. A motor-generator comprises a stator, a rotor supported for movement relative to the stator, and a control system. The motor-generator comprises a winding configuration supported by the stator. The winding configuration comprises at least three pole pairs through which phase current flows resulting in three three-phase systems. Each phase system has a first rotor reference frame axis current that produces a levitating force with no average torque and a second rotor reference frame axis current that produces torque. | 03-05-2009 |
| 20090079370 | IPM MOTOR SYSTEM AND CONTROL METHOD THEREOF - An IPM (Interior Permanent Magnet) motor system is provided with an IPM motor provided with a stator having slots and a rotor having poles, and a control unit which controls the rotor to the stator. An estimation precision of an initial angle position of the rotor to the stator is selected such that it is substantially the same as an angle unit precision of stable positions of the rotor to the stator which is based on a combination of the number of poles and the number of slots. In this way, the cheap IPM motor system with a high drive efficiency and a control method of the IPM motor system are provided. | 03-26-2009 |
| 20090079371 | MOTOR CONTROLLER AND ELECTRIC POWER STEERING APPARATUS - A signal generating section includes a second calculating section that corrects phase resistance. The calculating section stores resistance values of phases that have been measured in advance and a reference resistance value. The calculating section calculates correction components, which cancel a voltage drop term of a voltage equation of a d-q coordinate system changing depending on the rotation angle of the motor, based on the stored resistance values and the reference resistance value. The signal generating section superimposes the correction component and the correction component on a d-axis voltage command value and a q-axis voltage command value, respectively. The d-axis voltage command value and the q-axis voltage command value are thus corrected in such a manner as to suppress a torque ripple caused by difference among the resistance values of the phases. | 03-26-2009 |
| 20090140674 | CONTROL APPARATUS FOR AC MOTOR - It is attained by being provided with a motor constant calculation unit for calculating electric constants of a motor, and by correcting setting values of electric constants defined on one of the axes of two orthogonal axes, by a functional expression using a state variable defined on the same axis, and by correcting them by a functional expression using a state variable defined on the other axis. | 06-04-2009 |
| 20090146589 | Motor Control Device and Vehicle Including the Same - A current instruction generation unit generates a d-axis current instruction and a q-axis current instruction based on a torque instruction for an AC motor, using a map in which a current instruction capable of lowering noise (vibration and sound noise) (low-noise current instruction) generated from the AC motor is determined in advance for each torque of the AC motor. Then, a signal for driving an inverter is generated based on the generated d-axis current instruction and the q-axis current instruction. | 06-11-2009 |
| 20090146590 | CONTROLLER OF MULTI-PHASE ELECTRIC MOTOR - A controller of a multi-phase electric motor includes a drive section for driving the multi-phase electric motor; a single current detection section for detecting a current value of the multi-phase electric motor, a PWM signal generation section for generating plural PWM signals of each phase within one control period based on the current value detected by the current detection section and a carrier signal; and a phase movement section for moving a phase by a predetermined amount such that frequency in change of the PWM signal of the predetermined phase generated by the PWM signal generation section is included in a non-audible range, and outputting the PWM signal which phase is moved to the drive section; wherein the phase movement section moves the phase by a predetermined amount for all the PWM signals of the predetermined phase within one control period. | 06-11-2009 |
| 20090146591 | Motor controller of air conditioner - The present invention relates to a motor controller of an air conditioner, including an inverter including a plurality of switching elements and adapted to convert a DC voltage, input through switching operations of the switching elements, into an AC voltage and supply the converted voltage to a motor, a power calculation unit that calculates electric power applied to the motor, an angle calculation unit that calculates an optimal phase angle of a current command value based on the calculated electric power; and a microcomputer that outputs a switching control signal to control the switching elements of the inverter based on the optimal phase angle. | 06-11-2009 |
| 20090146592 | POSITION SENSORLESS CONTROLLER FOR PERMANENT MAGNET MOTOR - In a calculation for estimating axis error in a permanent magnet motor, a d-axis commanded voltage value is added to the product of three signals, which are a q-axis detected current value or commanded current value, an inductance value, and an estimated speed value, and then the resulting value is divided by the product of a commanded speed value ω | 06-11-2009 |
| 20090160376 | CONTROL SYSTEM FOR MULTIPHASE ROTARY MACHINES - In a control system designed to use a plurality of voltage vectors expressing a switching mode for a switching circuit to thereby control a difference between a current actually flowing through a multiphase rotary machine and a command current value therefor within an allowable range, a calculating unit calculates a direction of change in the difference during the switching mode for the switching circuit being set to a zero vector. A zero-vector setting unit sets the switching mode for the switching circuit to the zero vector when a preset positional condition between the difference and the direction of change in the difference is met in a space. | 06-25-2009 |
| 20090160377 | CONTROL SYSTEM FOR MULTIPHASE ROTARY MACHINES - A control system is designed to use a plurality of voltage vectors expressing a switching mode for a switching circuit to thereby control a difference between a current actually flowing through a multiphase rotary machine and a command current value therefor within an allowable range. The plurality of voltage vectors include a zero vector that allows line-to-line voltages in the multiphase rotary machine to be all zero, and a plurality of non-zero vectors that allow at least one of line-to-line voltage in the multiphase rotary machine to be nonzero. A drive unit is configured to switch only one phase of the switching element for each shift of the switching mode to thereby shift, in accordance with a preset switching pattern, the switching mode from a specified one of the plurality of non-zero vectors to the specified one of the plurality of non-zero vectors via the zero vector. | 06-25-2009 |
| 20090206780 | Method and Device for Operating a Synchronous Machine - According to the invention, estimated values (i | 08-20-2009 |
| 20090230900 | CURRENT REGULATOR AND CURRENT CONTROL METHOD AND SYSTEM FOR AC MOTORS - Methods and systems are provided for controlling an AC motor via an inverter. The method includes determining a delay-compensated offset based on a synchronous frame current, producing a current error based on a synchronous frame current and a commanded current, producing a voltage error based on an anti-windup offset and the current error, producing a commanded voltage based on the delay-compensated offset and the voltage error, and providing the inverter with the commanded voltage. | 09-17-2009 |
| 20090237013 | Control Apparatus and Method for Motor Drive System - In the rectangular-wave voltage control mode, torque feedback control, in which the voltage phase of the rectangular-wave voltage is adjusted based on the deviation of the torque estimated value from the torque command value, is performed. A torque estimation portion calculates the torque estimated value using the motor currents calculated based on the values detected by a current sensor and a rotational position sensor, as in the case of the PWM control mode. Namely, the same state quantity (quantity detected by the sensors) of the alternating-current motor is used in the motor control in both the rectangular-wave voltage control mode and the PWM control mode. | 09-24-2009 |
| 20090237014 | SYNCHRONOUS MOTOR CONTROL DEVICE AND METHOD FOR OPTIMIZING SYNCHRONOUS MOTOR CONTROL - A synchronous motor control device, includes a coordinate transformation portion for coordinate transforming motor currents applied to respective three phases of a synchronous motor into a d-axis, corresponding to a direction of a magnetic field generated by a permanent magnet arranged at a rotor of the synchronous motor, and a q-axis orthogonal to the d-axis, a current command calculation portion for calculating a d-axis current command and a q-axis current command from a target torque, a voltage command calculation portion for calculating a d-axis voltage command and a q-axis voltage command, an inverse coordinate transformation portion for inversely coordinate transforming the d-axis voltage command and the q-axis voltage command into three-phase voltage commands, and a torque ripple estimating portion for estimating a torque ripple and feed-forwarding the estimation results to the current command calculation portion or the voltage command calculation portion. | 09-24-2009 |
| 20090237015 | Motor Control Device - To prevent a step-out of a permanent magnet synchronous type motor ( | 09-24-2009 |
| 20090251082 | CONTROLLER FOR AC ROTARY MACHINE - A controller for an AC rotary machine is proposed, by which a stable rotation angular-frequency estimate value can be obtained even in an extremely low speed region of the AC rotary machine, and consequently stable control can be performed. A controller for an AC rotary machine has an angular-frequency estimate output means | 10-08-2009 |
| 20090256503 | MOTOR CONTROL APPARATUS AND ELECTRIC POWER STEERING SYSTEM - If the magnitude of a command voltage vector is greater than a predetermined voltage value indicated by a voltage limit circle, the magnitude of a voltage vector, which corresponds to a q-axis current and which forms the command voltage vector, is adjusted so that the magnitude of the command voltage vector is equal to or less than the predetermined voltage value. Then a q-axis current estimated value is obtained based on i) the ratio of the magnitude of the voltage vector from the q-axis current after adjustment to the magnitude of the voltage vector from the q-axis current before adjustment, and ii) a q-axis current command value. | 10-15-2009 |
| 20090267546 | MOTOR CONTROL DEVICE, MOTOR DRIVE SYSTEM, WASHING MACHINE, AIR CONDITIONER AND METHOD OF CHANGING MAGNETIZATION AMOUNT OF PERMANENT MAGNET MOTOR - A motor control device includes a magnetization control unit energizing a motor winding to change magnetic flux content of permanent magnet motor, a current detector detecting current supplied to the motor, a vector control unit including a speed/position estimation unit carrying out an operation to estimate a motor rotational speed and rotational position, the vector control unit carrying out a vector control of the motor, an induced voltage detector detecting an induced voltage of the motor based on the rotational speed, motor currents obtained by the vector control unit, output voltages of the drive unit, a winding inductance or the motor constant and a winding resistance, an induced voltage command determining unit determining an induced voltage command based on the motor rotational speed and output torque, and a magnetization current determining unit determining an amount of energization based on the induced voltage of the motor and the induced voltage command. | 10-29-2009 |
| 20090267547 | MOTOR CONTROL DEVICE AND MAGNETIC POLE POSITION ESTIMATION PRECISION CONFIRMING METHOD - A motor control device includes a dq-axis current control unit for generating a dq-axis voltage reference based on a dq-axis current reference and a dq-axis current signal, an initial magnetic pole position estimation unit for estimating a magnetic pole position of the motor upon power-on to generate a magnetic pole position signal, and a magnetic pole position estimation precision confirming unit for supplying a current in a d-axis direction after generation of the magnetic pole position signal with the initial magnetic pole position estimation unit, and checking an error of the magnetic pole position signal based on an angle of movement of the motor. | 10-29-2009 |
| 20090278482 | SERVOMOTOR CURRENT CONTROL METHOD, CURRENT CONTROL PROGRAM, RECORDING MEDIUM, SERVOMOTOR, AND INJECTION MOLDING MACHINE - A method of controlling a current by supplying a d-axis current in order to prevent a voltage saturation includes: defining an amount of the d-axis current as Id=|Idmax|·sin θ; continuously comparing a voltage command value with the voltage command value threshold Vo in a predetermined cycle; extracting a predetermined number No of latest: comparison results in terms of time; setting a phase angle θ to be 0° when a number N of the comparison results out of the predetermined number No of the comparison results is equal to or less than an integer Nb; and increasing the phase angle θ depending on largeness of the number N when the number N is more than the integer Nb. | 11-12-2009 |
| 20090284194 | PHASE CURRENT MEASUREMENTS IN A THREE PHASE INVERTER USING A SINGLE COMMON DC-LINK CURRENT SENSOR - A method for measuring current in each phase of a three-phase inverter driven motor is based on the three-phase inverter being controlled in a PWM mode by three PWM signals including the use of a common DC-link current sensing resistor. The current on the sensing resistor is intermittently sampled. The method includes determining a modulation index for the voltage demand set by a motor controller. Based on specific mutual duty cycle conditions of the three PWM phase driving signals, sampling windows of sufficient duration are created for allowing distinct sampling of two of the phase currents. | 11-19-2009 |
| 20090284195 | GAIN ADJUSTMENT TO IMPROVE TORQUE LINEARITY OF AN ELECTRIC MACHINE DURING OPERATION IN A FIELD WEAKENING REGION - Systems and methods are disclosed to improve torque linearity of an electric machine when operating in a field-weakening region. The systems and methods adjust the q-axis and the d-axis components of the stator current commands of the electric machine using a flux weakening control loop and a torque linearity control loop such that torque linearity is maintained when the machine operates in a field weakening region of operation. | 11-19-2009 |
| 20090295316 | GEARLESS WHEEL MOTOR DRIVE SYSTEM - Methods and apparatus are provided for an electric vehicle embodying an axial flux traction motor directly coupled to a wheel thereof. The traction motor comprises a stator having coils for producing a magnetic field, an annular rotor magnetically coupled to the stator and mechanically to an output shaft. Permanent magnets of alternating polarity are mounted on the annular rotor. Magnetic shunts bridge a portion of the stator slots above the coils. The magnets are arranged in groups with group-to-group spacing exceeding magnet-to-magnet spacing. Adjacent edges of the magnets diverge. The method comprises, looking up d- and q-axis currents to provide the requested torque and motor speed for the available DC voltage, combining at least one of the d- and q-axis currents with a field weakening correction term, converting the result from synchronous to stationary frame and operating an inverter therewith to provide current to the coils of the motor. | 12-03-2009 |
| 20090315492 | MOTOR CONTROL UNIT AND AIR CONDITIONER HAVING THE SAME - A motor control unit or a semiconductor integrated circuit device for an air conditioner is provided. The motor control unit includes a current detector that detects a coil wound current of the permanent magnet motor; a coordinate transformer that transforms the coil wound current detected by the current detector into a d-axis current indicating a magnet flux component and a q-axis current indicating a torque component perpendicular to the magnet flux component; a position estimator that estimates a rotational position of the rotor based on an induced voltage of the permanent magnet motor; a current controller that calculates a command d-axis voltage based on a command d-axis current and the d-axis current detected by the current detector, and that calculates a command q-axis voltage based on a command q-axis current and the q-axis current detected by the current detector; an electrifier controller that electrifies the coil wound based on the command d-axis voltage and the command q-axis voltage; and a start-up controller that detects an oscillation of the rotor during a start-up operation and, if a velocity direction of the oscillation corresponds with a rotational direction of a forcible commutation, the start-up controller starts the forcible commutation so as to start an acceleration of the rotor by following an acceleration pattern. | 12-24-2009 |
| 20090322262 | Controller For Permanent Magnet Synchronous Motor and Motor Control System - A motor control system includes a power converter, a vector controller for controlling the power converter, an axial error estimating operation for estimating an axial error which is a deviation between the phase estimation value and phase value of the motor, and a rotational speed estimating computing unit | 12-31-2009 |
| 20100026216 | CONTROLLER FOR MOTOR - A controller for an axial gap-type motor ( | 02-04-2010 |
| 20100045217 | Motor control apparatus and electric power steering apparatus - An angle calculation portion of a motor control apparatus determines an angle θ of a rotor, and an angular velocity calculation portion determines an angular velocity ωe of the rotor. A command current calculation portion determines command currents id* and iq* on dq axes, based on a steering torque T and a vehicle speed S. An open-loop control portion determines command voltages vd and vq on the dq axes based on the command currents id* and iq* and the angular velocity ωe, according to circuit equations of a motor. A dq-axis/three-phase conversion portion converts the command voltages vd and vq to command voltages of three phases. A three-phase voltage correction portion corrects the command voltage so that an actual time average value of a voltage applied to each phase is equal to a time average value of a voltage that is to be applied to the phase if the voltage is not decreased, in order to compensate for a decrease in the applied voltage. By performing the correction, it is possible to eliminate or suppress a decrease in control accuracy due to a wiring resistance and the like. | 02-25-2010 |
| 20100045218 | Motor Control Device - To estimate an initial magnetic pole position in a short time, estimated axes for control that correspond to the d-axis and the q-axis are set as the γ-axis and the d-axis, and a high frequency rotation voltage or alternating voltage on the γδ coordinate system is applied to the motor. A high frequency current i | 02-25-2010 |
| 20100060210 | METHOD AND APPARATUS FOR AUTOMATICALLY IDENTIFYING ELECTRICAL PARAMETERS IN A SENSOR-LESS PMSM - A method and apparatus for determining electrical parameters for commissioning a sensor-less permanent magnet synchronous machine uses knowledge of the rotor position to apply balanced pulses along the rotor magnet axis and perpendicular to the rotor magnet axis allowing measurement of q- and d-inductance at multiple current levels without substantial rotor movement. | 03-11-2010 |
| 20100060211 | Inverter Control Apparatus And Motor Drive System - An inverter control apparatus that controls a three-phase inverter which transforms a direct-current voltage into an alternating three-phase voltage, the inverter control apparatus includes: a voltage command vector generation portion that generates a first voltage command vector for specifying a vector of a voltage to be applied to a three-phase load that is connected to the inverter; a voltage command vector correction portion that in performing overmodulation with the inverter, corrects the first voltage command vector by setting a limit onto a coordinate-axis component of the first voltage command vector on an ab coordinate system to generate a second voltage command vector, wherein the inverter is so controlled that a voltage depending on the second voltage command vector is applied to the load, and the ab coordinate system is a coordinated system that depending on a phase of the first voltage command vector with respect to a predetermined fixed axis on a two-dimensional fixed coordinate system, rotates in stepwise fashion for every 60 degrees in electrical angle with respect to the fixed coordinate system. | 03-11-2010 |
| 20100066283 | VECTOR CONTROLLER FOR PERMANENT-MAGNET SYNCHRONOUS ELECTRIC MOTOR - A method of controlling a current command by comparing voltage with a set value needs to vary the set value depending on voltage fluctuation, which involves taking a complicated control. A vector controller for a permanent-magnet synchronous electric motor, according to the present invention, can realize with a simplified configuration a field-weakening operation in a one-pulse mode in a high speed range by providing a current command compensator that corrects a current command by a corrected current command calculated based on a modulation index. | 03-18-2010 |
| 20100066284 | DRIVE SYSTEM OF SYNCHRONOUS MOTOR - A position sensorless drive method capable of driving a permanent magnet motor by an ideal sine-wave current and enabling the driving from an extremely low-speed range in the vicinity of zero-speed is provided. A neutral-point potential of the permanent magnet motor is detected in synchronization with a PWM waveform of an inverter. The position of a rotor of the permanent magnet motor is estimated from the variation of the neutral-point potential. Since the neutral-point potential is varied in accordance with the magnetic circuit characteristics of an individual permanent magnet motor, the position can be detected regardless of the presence of saliency of the permanent magnet motor. | 03-18-2010 |
| 20100072925 | ROTARY ELECTRIC MACHINE CONTROL SYSTEM - A control unit for a rotary electric machine control system includes a first current command module, a second current command module and a change module. The first current command module controls the rotary electric machine based on a maximum efficiency characteristic line. The second current command module controls the rotary electric machine based on an early switching characteristic line, which is set at a retard angle side relative to the maximum efficiency characteristic line with a predetermined phase difference. When a control mode is switched over to a rectangular wave voltage phase control mode from an overmodulation current control mode in accordance with an increase in torque, the change module changes the current command from the first current command module to the second command current module. | 03-25-2010 |
| 20100109583 | INVERTER CONTROL DEVICE AND AC MOTOR CONTROL DEVICE USING THIS INVERTER CONTROL DEVICE - There is provided a current tracking PWM control circuit that directly generates PWM signals such that inverter output currents id, iq track PWM current references id**, iq**, using the results of comparison of the inverter output currents id, iq and PWM current references id**, iq**, in which, if current references id*, iq* exist, the result of adding the original current reference iq* and a correction signal iqC*, obtained by amplifying the deviation (iq*-iq) of the current reference iq* and iq, is used as the PWM current reference iq** on the q axis side for performing current control, but, in respect of the d axis side, the original current reference id* is used directly as the PWM current reference id** for performing current control. | 05-06-2010 |
| 20100109584 | POSITION-SENSORLESS CONTROL SYSTEM AND METHOD OF OPERATION FOR A SYNCHRONOUS MOTOR - This invention provides an advanced position and velocity estimation scheme used in a position-sensorless control system for synchronous operation of an electric motor. The system includes an electric motor having a stator and a rotor; an inverter for powering the electric motor; and a controller for controlling the inverter. The controller utilizes a control system comprising a rotor angle and angular velocity estimation block; an estimated angle error detector block; a field-weakening block; and a torque-to-current converter block, all of which operate to generate control commands for operation of the motor. | 05-06-2010 |
| 20100117568 | CONTROLLER FOR CALCULATING ELECTRIC POWER CONSUMPTION OF INDUSTRIAL MACHINE - A controller of an industrial machine provided with an electric motor, a peripheral apparatus and an amplifier for the motor. The controller includes a motor power-consumption calculation section calculating motor power consumption by multiplying a motor current detection value, a motor rotation-speed detection value and a predetermined motor torque constant together; a power loss calculation section calculating sum power loss of the motor and amplifier by adding motor power loss determined by multiplying a square of the motor current detection value by a predetermined motor winding-resistance value, amplifier power loss determined by multiplying the motor current detection value by a predetermined amplifier power-loss coefficient, and predetermined fixed amplifier power consumption together; a fixed power-consumption calculation section calculating fixed power consumption of the peripheral apparatus; and a total power-consumption calculation section determining total power consumption of the industrial machine in a predetermined time period by integrating, for the time period, the calculated motor power consumption, the calculated sum power loss and the calculated fixed power consumption. | 05-13-2010 |
| 20100123418 | ALTERNATING-CURRENT MOTOR CONTROL APPARATUS - When a rectangular wave voltage control mode is selected, a control apparatus estimates the output torque of an alternating-current motor based on the outputs of a current sensor and a rotation angle sensor, and executes torque feedback control by adjusting the phase of rectangular wave voltage based on the difference between the torque estimated value and a torque command value. The control apparatus executes a switching interruption that outputs a control command to a switching element of an inverter every 60 degrees of electrical angle, and executes an angle interruption that samples the phase currents of the alternating-current motor based on the output of the current sensor and converts those phase currents into a d-axis current and a q-axis current every predetermined electrical angle that is set beforehand. The control apparatus for the alternating-current motor then sets the predetermined electrical angle such that the number of angle interruptions between switching interruptions varies according to the rotation speed of the alternating-current motor. | 05-20-2010 |
| 20100148706 | POWER CONVERTER - In a power converter including a V connection inverter circuit, harmonic components included in output voltage are reduced to achieve a reduction in a loss of a load, such as a motor. | 06-17-2010 |
| 20100148707 | SPEED CONTROLLER OF MAGNETIC MOTOR - The invention relates to a speed control method of a magnetic motor and is capable of providing a speed controller of the magnetic motor realizing highly stable, highly efficient and highly responsive control characteristics even around critical torque of the motor. When an excessive torque command value (or a q-axis commanded current value) greater than a torque maximum value (or a q-axis current) that can be outputted by the motor is required, an input of speed control is limited so that the q-axis commanded current value does not increase up to a limit value. | 06-17-2010 |
| 20100156330 | APPARATUS FOR CONTROLLING PERMANENT-MAGNET ROTARY ELECTRIC MACHINE - It is an apparatus for controlling a permanent magnet rotary electric machine. After the apparatus controls a current control portion in a state, in which a rotor of the permanent magnet rotary electric machine rotates at a constant speed, to supply a predetermined current to an armature, the apparatus performs a dq vector control process by determining a predetermined temporarily set value as a magnetic pole position correction quantity while a d-axis current command value and a q-axis current command value in the dq vector control process performed on a dq coordinate system that has a d-axis extending in the direction of a magnetic field of the permanent magnet of the rotor and a q-axis extending in a direction perpendicular to the d-axis. Then, the apparatus obtains the magnetic pole position correction quantity based on a predetermined operation expression using the d-axis voltage command value and the q-axis voltage command value which are obtained when the dq vector control process is performed. | 06-24-2010 |
| 20100194316 | Method and Device for Field-Oriented Regulation of a Polyphase Machine - A method and a device for field-oriented regulation of a polyphase machine. An actual torque of the polyphase machine is ascertained, the ascertained actual torque is compared with a setpoint torque, and in the event that torque differences occur, the setpoint values for the flow-forming current and the torque-forming current are modified to bring the actual torque into agreement with the setpoint torque. The actual torque is calculated with the aid of the power balance of the polyphase machine. | 08-05-2010 |
| 20100207555 | ALTERNATING-CURRENT MOTOR CONTROL APPARATUS - An alternating-current motor control apparatus includes a voltage controller configured to output a command voltage vector so that the command voltage vector is time-averaged for time periods, a square-wave voltage generator configured to control, every time period, amplitudes and phases of voltages to be applied to an alternating-current motor, a current detector configured to detect motor currents at a timing synchronized with periods 1/N-th of the time periods, where N is equal to or larger than one, a coordinate transformation section configured to perform coordinate transformation to transform the motor currents into two-phase currents, an envelope extractor configured to extract two-phase currents as waveforms having amplitudes that periodically change from the two-phase currents, and extract envelopes of the waveforms, and a magnetic-pole-position computing section configured to compute a magnetic-pole position using the envelopes. | 08-19-2010 |
| 20100219780 | MOTOR CONTROL APPARATUS - A motor control apparatus includes a current control unit which is configured to calculate dq-axis voltage commands to match d-axis and q-axis current commands with d-axis and q-axis currents of a motor current, respectively. A power conversion circuit is configured to drive the motor. A modulation factor command unit is configured to determine a modulation factor command. A modulation wave command unit is configured to determine modulation wave commands. A pulse width modulation generating unit is configured to generate a pulse width modulation pattern. A modulation factor saturation level calculating unit is configured to determine a modulation factor saturation level. A field-weakening control unit is configured to correct the d-axis current command. | 09-02-2010 |
| 20100225257 | DEVICE FOR CONTROLLING A POLYPHASE ROTATING MACHINE - A device for controlling a polyphase rotating machine comprising a stator, a rotor, and sensors, the device being capable of receiving at least one first sensing signal (V, W, U) representing a position of the rotor relative to the stator and outputted from a first sensor ( | 09-09-2010 |
| 20100231148 | Torque Controller for Permanent Magnet Synchronous Motor - When output voltage V | 09-16-2010 |
| 20100231149 | LINEARITY FOR FIELD WEAKENING IN AN INTERIOR PERMANENT MAGNET MACHINE - Systems and methods are disclosed to provide torque linearity in the field-weakening region for an electric (e.g., IPM) machine. The systems and methods implement a field weakening and a torque linearity control loop for linearizing torque generated by an electric machine. First and second voltage commands are used at the field weakening loop to generate a first adjusting current command. The first adjusting current command is then provided to the torque linearity control loop, where it is multiplied by a gain to generate an output current command, which can then be limited to generate a second adjusting current command. The second adjusting current command can then be added to a current command to generate an adjusted current command. The first adjusting current command can also be added to another current command to generate another adjusted current command. The adjusted current commands and feedback currents are then used at a synchronous current regulator to generate new first and second voltage commands. As a result, torque linearity is maintained when the electric machine operates in the field weakening region. | 09-16-2010 |
| 20100253252 | MOTOR CONTROL SYSTEM FOR ACHIEVING PEAK TORQUE - In a motor controller, a modified interpolation technique uses an extrapolated torque command for the upper table to improve torque linearity under certain conditions. When the torque command input is greater than the max torque limit of a first look-up table, but less than the maximum torque limit of a second, adjacent look-up table, the desired current command is computed by interpolating between the maximum torque limit of the first table and a revised torque value for the second look-up table, wherein the revised torque value is determined by extrapolating from the maximum torque limit of the first look-up table through a torque value based on the torque command input. | 10-07-2010 |
| 20100259204 | CONTROL DEVICE FOR ELECTRIC ROTATING MACHINE - A control device has a unit for selecting each of controlled voltages outputted from an inverter to a generator, a unit for judging a polarity of a current flowing through the generator, a unit for predicting a current of the generator from each selected voltage to be outputted from the inverter in the succeeding period, while performing the prediction based on the current polarity each time the selected voltage differs from the voltage already outputted from the inverter in the present period, a unit for determining one voltage corresponding to one predicted current nearest to an instructed current among the predicted currents, and a unit for controlling the generator by controlling the inverter to change the voltage already outputted from the inverter to the determined voltage and to apply the determined voltage to the generator in the succeeding period. | 10-14-2010 |
| 20100264859 | CONTROL APPARATUS AND CONTROL METHOD FOR AC MOTOR - A control apparatus for an AC motor controls an inverter in a pulse width modulation scheme to feed a coil current to a stator coil of a stator. A pattern switching mechanism switches a control pattern to a first pattern or to a second pattern; a first pattern calculating mechanism calculates a control signal using a first pattern parameter; a second pattern calculating mechanism calculates a control signal using a second pattern parameter; an offset calculating mechanism calculates a difference between a control signal of an old pattern and a control signal of a new pattern, and reflects the offset amount on the control signals; and a control output mechanism calculates a final control output signal on the basis of the control signals, and transmits the final control output signal to the inverter. | 10-21-2010 |
| 20100264860 | MOTOR AND APPARATUS AND METHOD FOR CONTROLLING THE MOTOR - A motor, and a method and apparatus for controlling the motor for a washer are provided. The motor includes a stator on which a plurality of coils are wound and disposed in a circular shape, a rotor having a plurality of permanent magnets spaced apart from the coils by a predetermined distance, and a motor controller performing a vector control method for controlling a current vector applied on a d-q axis rotating coordinate system in a start mode of the rotor to make a current speed of the rotor follow a reference speed of the rotor by comparing the current speed with the reference speed. The motor controller includes a speed/position detector for detecting the current speed and a current position of the rotor using an on/off signal of a hall sensor installed on the stator. | 10-21-2010 |
| 20100264861 | METHOD FOR DETERMINING THE POSITION OF THE FLUX VECTOR OF A MOTOR - The invention relates to a method for determining the position of a rotor flux vector of an electric motor (M), comprising a step of injecting a first current vector into a first reference frame (x | 10-21-2010 |
| 20100277111 | PERMANENT MAGNET SYNCHRONIZATION MOTOR VECTOR CONTROL DEVICE - Provided is a vector control device for a permanent magnet synchronous motor driven by an inverter. The vector control device includes: a current command generation unit for generating a d-axis current command id* and q-axis current command iq* from a given torque command T*; and a current control unit operating so that the motor current coincides with the current command. The current command generation unit includes: a d-axis basic current command generation unit for generating a first d-axis basic current command id | 11-04-2010 |
| 20100277112 | Motor, Apparatus for Controlling Motor, and Method for Starting Motor - When it is determined that a rotor is initially in a stationary state, a current vector is applied to a coil by a vector control method so as to rotate the rotor in a forward direction from a present position of the rotor regardless of a predetermined start position of the rotor. Therefore, a motor can be stably started with less power consumption and noise/vibration. | 11-04-2010 |
| 20100283414 | MOTOR FOR WASHER, METHOD FOR CONTROLLING THE MOTOR, AND METHOD FOR CONTROLLING THE WASHER - A motor, and a method and apparatus for controlling the motor for a washer are provided. The motor includes a stator on which a plurality of coils are wound and disposed in a circular shape, a rotor having a plurality of permanent magnets spaced apart from the coils by a predetermined distance, and a motor controller performing a vector control method for controlling a current vector applied on a d-q axis rotating coordinate system in a start mode of the rotor to make a current speed of the rotor follow a reference speed of the rotor by comparing the current speed with the reference speed. The motor controller includes a speed/position detector for detecting the current speed and a current position of the rotor using an on/off signal of a hall sensor installed on the stator. | 11-11-2010 |
| 20100301786 | METHODS, SYSTEMS AND APPARATUS FOR CONTROLLING OPERATION OF TWO ALTERNATING CURRENT (AC) MACHINES - A system is provided for controlling two AC machines. The system comprises a DC input voltage source that provides a DC input voltage, a voltage boost command control module (VBCCM), a five-phase PWM inverter module coupled to the two AC machines, and a boost converter coupled to the inverter module and the DC input voltage source. The boost converter is designed to supply a new DC input voltage to the inverter module having a value that is greater than or equal to a value of the DC input voltage. The VBCCM generates a boost command signal (BCS) based on modulation indexes from the two AC machines. The BCS controls the boost converter such that the boost converter generates the new DC input voltage in response to the BCS. When the two AC machines require additional voltage that exceeds the DC input voltage required to meet a combined target mechanical power required by the two AC machines, the BCS controls the boost converter to drive the new DC input voltage generated by the boost converter to a value greater than the DC input voltage. | 12-02-2010 |
| 20100301787 | METHODS, SYSTEMS AND APPARATUS FOR CONTROLLING OPERATION OF TWO ALTERNATING CURRENT (AC) MACHINES - A system is provided for controlling two alternating current (AC) machines via a five-phase PWM inverter module. The system comprises a first control loop, a second control loop, and a current command adjustment module. The current command adjustment module operates in conjunction with the first control loop and the second control loop to continuously adjust current command signals that control the first AC machine and the second AC machine such that they share the input voltage available to them without compromising the target mechanical output power of either machine. This way, even when the phase voltage available to either one of the machines decreases, that machine outputs its target mechanical output power. | 12-02-2010 |
| 20100308757 | ALTERNATING-CURRENT MOTOR CONTROL APPARATUS - An alternating-current motor control apparatus includes an inverter unit, a current-command divider, a current controller, a torque-variation calculator, and a phase angle generator. The inverter unit is configured to output a command voltage to an alternating-current motor. The current-command divider is configured to divide a command current amplitude into command current components based on a phase-angle command value that is a sum of the phase angle and an alternating current signal. The current controller is configured to control current to match a motor current flowing through the motor with the command current components. The torque-variation calculator is configured to calculate a motor electric power based on the command voltage and either the motor current or the command current components and to calculate a torque variation based on the motor electric power. The phase angle generator is configured to generate a phase angle based on the torque variation. | 12-09-2010 |
| 20100315026 | Self Starting Method and an Apparatus for Sensorless Commutation of Brushless CD Motors - A method and apparatus for electronic control of a direct current motor is disclosed based upon a sensorless commutation technique using voltage vector analysis. A voltage vector is produced by addition of supply phase voltage vectors of energized windings with the back-electromotive force vector of the unenergized winding. The resultant voltage vector rotates at the same speed as the rotor and possesses rotor position information used to commutate phase windings. The angle that the resultant voltage vector makes with the real axis is measured to commutate the phase windings. By parking the rotor in a predetermined position, this technique can be used to efficiently start the motor from rest and commutate phase windings during normal operation. | 12-16-2010 |
| 20100320945 | MOTOR DRIVE SYSTEM USING POTENTIAL AT NEUTRAL POINT - According to input parameters, a controller carries out: generation of a voltage command value for each of d- and q-axes; conversion of the voltage command value for each of the d- and q-axes into a voltage command value for each of the multiphase windings; and control of a multiphase inverter based on the voltage command value for each of the multiphase windings. The controller adds, to the voltage command value for the q-axis, a first compensation voltage value for compensating torque ripples to thereby output a compensated voltage command value for the q-axis. The first compensation voltage value contains m-th harmonic components in the AC motor and varies depending on the rotational angle of the rotor, the m corresponding to the number of phase of the multiphase windings. The controller uses, as the voltage command value for the q-axis, the compensated voltage command value for the q-axis. | 12-23-2010 |
| 20110012544 | METHODS, SYSTEMS AND APPARATUS FOR SENSORLESS ROTOR ANGULAR POSITION ESTIMATION IMPLEMENTING REDUCED SWITCHING LOSS PULSE WIDTH MODULATED (PWM) WAVEFORMS - Methods, system and apparatus are provided for low speed sensorless rotor angular position estimation that implements reduced switching loss PWM waveforms. | 01-20-2011 |
| 20110025237 | Method and Control System for Controlling a Brushless Electric Motor - The present invention relates to a method and a system for controlling a permanent magnet excited, brushless, electronically commutated, three-phase electric motor ( | 02-03-2011 |
| 20110025238 | MOTOR CONTROLLER AND ELECTRONIC POWER STEERING APPARATUS - A command current setting portion has a target value corrector that calculates d-axis and q-axis current command values idc, iqc that are to be supplied to an open-loop controller, based on d-axis and q-axis current target values id*, iq*. When d-axis and q-axis voltage target value vd*, vq* calculated from the d-axis and q-axis current target values id*, iq* by the motor circuit equations exceed a voltage limit, this target value corrector | 02-03-2011 |
| 20110031909 | MOTOR DRIVE APPARATUS AND MOTOR DRIVE METHOD - The motor drive apparatus to perform vector control having excellent control performance on a motor includes an A/D converter which acquires currents flowing through a u-phase, a v-phase and a w-phase of the motor, a vector control unit which performs vector control on the motor based on d-axis motor current and q-axis motor current acquired by coordinate-converting the digitalized currents, a motor parameter and a desired angular speed of a motor rotor, a PWM generator which generates a PWM signal to drive the motor based on a motor voltage acquired by the vector control unit, and a parameter estimation unit which estimates a motor resistance, a d-axis motor inductance and a q-axis motor inductance in a direct current excitation state based on maximum peak values and minimum peak values of a d-axis motor voltage and a q-axis motor voltage and estimates a motor inductive voltage constant in a forced commutation control state. | 02-10-2011 |
| 20110043144 | MOTOR CONTROLLER AND ELECTRIC POWER STEERING SYSTEM - In a motor controller, a current detection unit detects an electric current flowing through a brushless motor. An open loop control unit determines a command value indicating a level of a command voltage in accordance with a motor circuit equation, based on a command current value indicating an amount of electric current to be supplied to the brushless motor and an angular velocity of a rotor in the brushless motor. A correction unit calculates a correction value based on a difference between the command current value and a current value detected by the current detection unit when the electric current is detected by the current detection unit and corrects the command value according to the correction value, and corrects the command value according to the correction value even when an electric current is not detected by the current detection unit. | 02-24-2011 |
| 20110062902 | METHOD AND APPARATUS FOR LOW SPEED PERMANENT MAGNET MOTOR OPERATION - Methods and apparatus are provided for startup of a permanent magnet alternating current (AC) motor. The method comprises the steps of detecting startup of the permanent magnet AC motor; detecting a mechanical oscillation of the permanent magnet AC motor when startup of the permanent magnet AC motor is detected; and, in response to detection of the mechanical oscillation of the permanent magnet AC motor when startup is detected, suppressing the mechanical oscillation of the permanent magnet AC motor. | 03-17-2011 |
| 20110062903 | MOTOR CONTROL DEVICE AND ELECTRICAL EQUIPMENT PROVIDED WITH THE SAME - A motor control device controlling an inverter to control an electric motor, includes a plurality of function sections, a voltage command generating section generating a d-axis voltage command and a q-axis voltage command, a voltage operational processing section, an input current operation section, a speed information generating section estimating a rotational speed of the motor based on at least one of a motor constant, a positional information generating section delivering positional information about a rotor, a processor executing control software set by a user, a manufacturer or the like. At least a part of the function sections are configured by hardware. The function section configured by the hardware is given at least one parameter retaining section. The parameter retaining section is configured so as to be readable/writable on the processor. The function section is configured by the hardware so as to be operated in a predetermined sequence. | 03-17-2011 |
| 20110068722 | Open-Loop or Closed-Loop Control Method for a Converter - An open-loop or closed-loop control method for a converter which supplies an electric motor, wherein a current space vector is acquired as motor current, and the motor voltage, in particular a voltage space vector, is set, an induced voltage space vector | 03-24-2011 |
| 20110074320 | CONTROL DEVICE FOR ELECTRIC MOTOR DRIVE DEVICE - A control device that controls an electric motor drive device. The control device is configured with a first voltage control section that derives a modulation rate representing a ratio of an effective value of the voltage command values to the DC voltage and a voltage command phase. A second voltage control section generates a control signal for controlling the DC/AC conversion section on the basis of the modulation rate, the voltage command phase, and a magnetic pole position representing a rotational angle of a rotator of the AC electric motor. A computation cycle of the first voltage control section is set to be longer than a computation cycle of the second voltage control section. | 03-31-2011 |
| 20110084634 | Motor apparatus including Lundell motor having Lundell-type rotor - The Lundell motor apparatus includes a controller for controlling a field current passed to a field coil of a Lundell-type rotor of a motor and an armature current passed to a stator coil of the motor in order to generate a required torque. When the field current is If, the armature current is Ia, a d-axis inductance is Ld, a q-axis inductance is Lq, a q-axis current as a q-axis component of the armature current is Iq, a d-axis current as a d-axis component of the armature current is Id, a field torque is Tf, a field flux is Φf, a reluctance torque is Tr, and a combined torque of the field torque and the reluctance torque is ΣT, the controller passes the d-axis current Id to the stator coil within a phase angle range in which the combined torque ΣT become larger than the field torque Tf in order to generate the reluctance torque Tr which is equal to (Ld−Lq)Id·Iq in addition to the field torque Tf. | 04-14-2011 |
| 20110127934 | MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE - A current command value computation section | 06-02-2011 |
| 20110148334 | METHOD AND ARRANGEMENT FOR CONTROLLING PERMANENT MAGNET SYNCHRONOUS MACHINES - A method and an arrangement are provided for controlling a sensorless permanent magnet synchronous machine using a frequency converter connected to feed the machine with electrical power. A current a current vector having a magnitude is produced to the stator of the machine with the frequency converter, and the current vector is rotated for rotating the rotor of the machine. Prior to starting the drive, a value is defined for the magnitude of the current vector and a frequency limit. The defined value is used as the magnitude of the current vector when the rotor of the machine is rotated with a frequency that is lower than the defined frequency limit. A vector control method is used for controlling the machine when the frequency of the machine is higher than or equal to the defined frequency limit. | 06-23-2011 |
| 20110148335 | CONTROL APPARATUS FOR PERMANENT MAGNET SYNCHRONOUS MOTOR - A control apparatus for a permanent magnet synchronous motor capable of performing highly accurate torque control not only during low-speed operation and medium-speed operation but also during high-speed operation without increasing a burden on a product CPU irrespective of whether the permanent magnet synchronous motor is an SPM motor or an IPM motor. The control apparatus includes a torque correction circuit that generate a torque correction command from a current phase of current correction commands on a d-axis and a q-axis and a torque command and supplies the torque correction command to a d/q-axis current command generator instead of the torque command. | 06-23-2011 |
| 20110156623 | MOTOR DRIVE APPARATUS AND POWER STEERING APPARATUS USING THE SAME - In a motor drive apparatus having two power supply systems for a motor, output phase currents supplied from inverters and detected by current sensors are added. Sums of the phase currents are fed back to a 3-2 phase conversion section and converted into a d-axis current and a q-axis current. A 2-3 phase conversion section outputs the same three-phase voltage command values to the inverters. Thus, the 3-2 phase conversion section and the 2-3 phase conversion section are both reduced to 1 in number, which is less than 2 of the inverters. | 06-30-2011 |
| 20110169434 | APPARATUS AND METHOD FOR CONTROLLING OPERATION OF INVERTER SYSTEM - An apparatus for controlling operation of inverter system configured to drive a motor by using an inverter, and to normally operate the motor in a resonance-generated frequency band if the resonance occurs, and a method thereof are disclosed, wherein the method includes detecting a current outputted by an inverter system to a motor, if an operation frequency of the motor is in a resonance frequency band, converting the detected current to a d axis current and a q axis current, calculating a difference between the converted d axis current and pre-sampled d axis current (magnetic flux portion), multiplying the calculated difference by a preset comparative control gain to calculate a comparative control voltage, and adding the calculated comparative control voltage to a torque portion voltage responsive to an operation frequency of the motor to generate a driving voltage of the motor. | 07-14-2011 |
| 20110175556 | TORQUE RIPPLE SUPPRESSION CONTROL DEVICE FOR PERMANENT MAGNET MOTOR AND ELECTRIC POWER STEERING SYSTEM - A torque ripple suppression control device for a permanent magnet motor includes a current command conversion unit that outputs a current command value, a position detector that detects a rotational position of the permanent magnet motor, a current detection unit that detects a current at the permanent magnet motor, an induced voltage coefficient setting unit that outputs an information signal related to an induced voltage coefficient for an induced voltage at the permanent magnet motor, a torque ripple suppression operation unit that outputs a current correction command value for the permanent magnet motor, a current control operation unit that outputs a voltage command value based upon addition results obtained by adding together the current command value and the current correction command value and the current detection value, and a power converter that outputs a voltage with which the permanent magnet motor is to be driven. | 07-21-2011 |
| 20110193505 | CONTROL DEVICE FOR ELECTRIC ROTARY MACHINE - A control device controls a power conversion circuit so as to adjust control values of a motor generator to optimum values. The power conversion circuit has switching elements for selectively connecting and disconnecting a battery and terminals of the motor generator. The control device sets a simulated voltage vector V(n+1) in one control-period forward to perform a prediction model control. On predicting a current, the control device uses a model in a rotary coordinate system, and sets the median value of the voltage vector V(n+1) in one control-period Tc to a value of the voltage vector V(n+1) in the rotary coordinate system. The control device sets, as the value of the voltage vector V(n+1) in the rotary coordinate system, the voltage vector V(n+1) when the half-time of the control-period Tc is elapsed from the time at the electric angle θ(n+1). | 08-11-2011 |
| 20110210687 | CONTROL APPARATUS FOR ELECTRIC ROTATING MACHINE - A control apparatus for use with an electric power conversion system which is equipped with a dc/ac converter connected to an electric rotating machine and a capacitor joined to input terminals of the dc/ac converter. The control apparatus stores an angle of rotation (i.e., start angle θ | 09-01-2011 |
| 20110221365 | METHODS, SYSTEMS AND APPARATUS FOR OPTIMIZATION OF THIRD HARMONIC CURRENT INJECTION IN A MULTI-PHASE MACHINE - Methods, system and apparatus are provided for increasing voltage utilization in a five-phase vector controlled machine drive system that employs third harmonic current injection to increase torque and power output by a five-phase machine. To do so, a fundamental current angle of a fundamental current vector is optimized for each particular torque-speed of operating point of the five-phase machine. | 09-15-2011 |
| 20110221366 | METHODS, SYSTEMS AND APPARATUS FOR SYNCHRONOUS CURRENT REGULATION OF A FIVE-PHASE MACHINE - Methods, systems and apparatus are provided for controlling operation of and regulating current provided to a five-phase machine when one or more phases has experienced a fault or has failed. In one implementation, the disclosed embodiments can be used to synchronously regulate current in a vector controlled motor drive system that includes a five-phase AC machine, a five-phase inverter module coupled to the five-phase AC machine, and a synchronous current regulator. | 09-15-2011 |
| 20110221367 | METHODS, SYSTEMS AND APPARATUS FOR OVERMODULATION OF A FIVE-PHASE MACHINE - Methods, system and apparatus are provided for overmodulation of a five-phase machine in a vector controlled motor drive system that includes a five-phase PWM controlled inverter module that drives the five-phase machine. Techniques for overmodulating a reference voltage vector are provided to optimize voltage command signals that control a five-phase inverter module to increase output voltages generated by the five-phase inverter module. | 09-15-2011 |
| 20110221368 | MOTOR DRIVE DEVICE - A motor drive device capable of suppressing generation of torque ripple and abnormal noise includes an inverter, and a control section for controlling the inverter. The control section includes a current command value calculation unit for calculating a current command value, a rotation calculation unit for calculating a rotation angle and an angular speed of the motor, a drive signal generation unit for generating a PWM signal, a correction signal generation unit for generating a correction signal for correcting the PWM signal to compensate for the dead time of the inverter, and an application current setting unit for adding a dead time to the PWM signal corrected by the correction signal and outputting the resulting signal to the inverter. The correction signal generation unit generates the correction signal based on the current command value and the rotation angle and the angular speed calculated by the rotation calculation unit. | 09-15-2011 |
| 20110241578 | METHOD FOR CONTROLLING PERMANENT MAGNET SYNCHRONOUS MOTOR - The present invention provides a method for controlling a permanent magnet synchronous motor used in electric vehicles such as hybrid vehicles, fuel cell vehicles, and the like. The method for controlling the permanent magnet synchronous motor preferably includes detecting an absolute angular position of a permanent magnet synchronous motor; calculating a rotational speed of the permanent magnet synchronous motor based on the detected absolute angular position; detecting a voltage of a battery as a power source; calculating a compensated speed, for which a battery voltage variation is compensated, from the rotational speed of the permanent magnet synchronous motor based on a torque command, the rotational speed of the permanent magnet synchronous motor, and the battery voltage; generating a d-axis current command and a q-axis current command corresponding to the torque command and the compensated speed using a predetermined current command map; converting three-phase currents flowing into the permanent magnet synchronous motor into a d-axis feedback current and a q-axis feedback current based on the detected absolute angular position; calculating a d-axis voltage command and a q-axis voltage command based on the d-axis current command, the q-axis current command, the d-axis feedback current, and the q-axis feedback current; converting the d-axis voltage command and the q-axis voltage command into three-phase voltage commands based on the detected absolute angular position; and controlling the operation of the permanent magnet synchronous motor based on the three-phase voltage commands. | 10-06-2011 |
| 20110241579 | CONTROLLER FOR AC ROTARY MACHINE AND CONTROLLER FOR ELECTRIC POWER STEERING - A storage section stores three-phase detection currents and outputs them as three-phase storage detection currents and also stores three-phase voltage commands and outputs them as three-phase storage voltage commands. A second voltage command calculating section outputs three-phase voltage commands on the basis of the three-phase storage detection currents and the three-phase storage voltage commands, which are acquired from the storage section, and the three-phase detection currents acquired from a current detecting means. A voltage command output means outputs, to a voltage application means, three-phase voltage commands acquired on the basis of the three-phase voltage commands from the storage section and the three-phase voltage commands from the second voltage command calculating section. The voltage application means applies a voltage to an AC rotary machine on the basis of the three-phase voltage commands from the voltage command output means. | 10-06-2011 |
| 20110248656 | MOTOR DRIVE DEVICE - A motor drive device has a drive circuit for driving a motor, and a control section for controlling the drive circuit. The control section has a current command value calculating portion for calculating a current command value, a rotation calculating portion for calculating a rotation angle and an angular speed of the motor, a current command value correcting portion for correcting the current command value based on the rotation angle, a voltage command value calculating portion for calculating a voltage command value based on the current command value, a voltage command value correcting portion for correcting the voltage command value based on the current command value and the rotation angle and the angular speed, and a drive signal generating portion for generating a drive signal based on the voltage command value. | 10-13-2011 |
| 20110279071 | CONTROL DEVICE FOR AC MOTOR - An overmodulation PWM control unit includes a voltage amplitude calculating unit for calculating a voltage command amplitude of an original voltage command based on current feedback control, a voltage amplitude correcting unit performing linear compensation on the voltage command amplitude so that a fundamental amplitude of a pulse width modulation voltage provided from an inverter may match the original voltage command amplitude, and a harmonic determining unit for determining presence or absence of superimposition of a three-order harmonic component on a phase voltage command. The harmonic determining unit performs switching between presence and absence of the three-order harmonic component based on transition of the original voltage command amplitude to avoid passing through a change point where discontinuity occurs in the voltage amplitude characteristics representing a relationship between a fundamental amplitude obtained in advance for each of the cases of presence and absence of the superimposition of the three-order harmonic component and the voltage command amplitude required for achieving the fundamental amplitude. | 11-17-2011 |
| 20110285332 | CONTROLLER FOR ELECTRICAL MACHINES - The present invention relates to control of electrical machines and in particular, though not exclusively, to control of synchronous machines such as hybrid stepping motors, flux switching machines and brushless permanent magnet motors and generators. A sensorless control system for an electrical machine is provided comprising a rotor, a stator having one or more phase windings for generating a rotating stator magnetic field, the system comprising detection means for monitoring the currents in the phase windings providing a real component I | 11-24-2011 |
| 20110298403 | Apparatus for carrying out improved control of rotary machine - In an apparatus, a norm setter sets, based on a request torque for a rotary machine and a rotational velocity of a rotor, a norm of a vector of an output voltage in a two-phase rotating coordinate system defined in the rotor. A phase setter sets, based on a deviation between a generated torque and the request torque, a phase of the vector of the output voltage of the power converter in the two-phase rotating coordinate system. A drive signal determiner determines, based on the norm set by the norm setter and the phase set by the phase setter, a drive signal, and applies the drive signal to a switching member to thereby drive the switching member such that the generated torque is adjusted to the request torque. | 12-08-2011 |
| 20110316457 | DQ VECTOR CONTROL SYSTEM PROVIDING STABLE, HIGH EFFICIENCY OPERATION OF ELECTRIC MOTOR - A control system for a multiphase electric motor includes inputs for a desired torque output of the motor, a measured torque output of the motor, a signal representative of optimal motor efficiency; a signal representative of a measured efficiency of the motor. The output is a two-dimensional DQ control voltage. A torque feedback control loop minimizes error between the desired and measured torque outputs by controlling an angle of the DQ control voltage, and a motor efficiency feedback control loop minimizes error between the optimal and measured motor efficiencies by controlling a magnitude of the DQ control voltage. | 12-29-2011 |
| 20110316458 | THREE-PHASE MOTOR CONTROLLER, THREE-PHASE MOTOR SYSTEM, THREE-PHASE MOTOR CONTROL METHOD AND PROGRAM - A three-phase motor control apparatus 4 controlling a driver which drives a three-phase motor includes: a desired rotation angle generation section 5 which generates a desired rotation angle; a rotation angle detector 2 which detects a detected rotation angle which is the rotation angle of said three phase motor; a feedback controller 6 which generates a q-axis command reference value which controls the q-axis voltage or the q-axis current of the three-phase motor 1 in response to the desired rotation angle and the detected rotation angle; a drive torque correction section and an adder 10 which generate a q-axis command value by correcting the q-axis command reference value; and a two-phase to three-phase transformation section 8 which generates a control signal which controls the driver circuit 3 which drives the three-phase motor in response to the q-axis command. The drive torque correction section 7 includes an angle look-up table 11 which contains elements respectively associated with angle ranges defined for the rotation angle of the three-phase motor, and selects any of the elements in response to the detected rotation angle. The q-axis command is generated by correcting the q-axis command reference value based on the value of the selected element. | 12-29-2011 |
| 20120001573 | CONTROLLER FOR AC ROTARY MACHINE - A controller for an AC rotary machine which performs a smooth drive from a low-speed region including zero speed to a high-speed region, and which can attain, even if an initial value error is present in an estimated phase, desired characteristics by promptly converging the error. An adaptive observation mechanism outputs an estimated magnetic flux phase, an estimated current vector, an estimated magnetic flux vector, and an estimated speed, based on a voltage instruction vector, a current deviation vector, and an amplified deviation vector; a deviation vector calculator calculates the current deviation vector between the estimated current vector and a detected current vector from a current vector detector, and a magnetic flux deviation vector between the estimated magnetic flux vector and a detected magnetic flux vector from a magnetic flux vector detector; and a deviation amplifier amplifies the current deviation vector and the magnetic flux deviation vector, and outputs the result as the amplified deviation vector. | 01-05-2012 |
| 20120007528 | AC MOTOR CONTROL DEVICE AND AC MOTOR DRIVING SYSTEM - The present invention relates to an AC motor control device and, particularly, to provide an AC control device capable of simply setting a state quantity of an AC motor non-linearly variable, in accordance with the motor driving state and using the setting in motor control, the present invention can be achieved by including a state quantity calculating unit ( | 01-12-2012 |
| 20120038295 | METHOD FOR OPERATING A POLYPHASE MACHINE HAVING A PULSE-WIDTH-MODULATED INVERTER - A method for operating a polyphase machine having a pulse-width-modulated inverter, having the steps: determining a setpoint current value respectively for a current in the longitudinal direction and/or the transverse direction based on a specified torque, ascertaining a setpoint voltage value respectively for a voltage in the longitudinal direction and/or the transverse direction with the aid of the setpoint current value and/or of an actual current value determined at the pulse-width-modulated inverter, controlling and/or regulating the polyphase machine corresponding to the ascertained setpoint voltage value. In this context it is provided that, in addition, using a model, a model value is determined respectively for the voltage in the longitudinal direction and/or the transverse direction, the difference between the setpoint voltage value and the model value is ascertained, and in response to the exceeding of a specifiable maximum difference, an error signal is triggered. | 02-16-2012 |
| 20120038296 | CONTROLLABLE RECTIFICATION DEVICE AND ELECTRIC MOTOR COMPRISING THE SAME - The present invention discloses a controllable rectification comprising an inverter ( | 02-16-2012 |
| 20120068639 | ELECTRIC MOTOR CONTROL DEVICE - An electric motor control device includes a control section adapted to control supply of a drive current to an electric motor, and a rotational speed detection section adapted to detect a rotational speed of the electric motor, the drive current includes a d-axis current and a q-axis current, and the control section calculates a q-axis current command value based on a torque command value to the electric motor, calculates a d-axis current command value using a difference between the rotational speed of the electric motor and a previously determined base rotational speed of the electric motor, and the q-axis current command value, and performs vector control on the electric motor using the d-axis current command value and the q-axis current command value. | 03-22-2012 |
| 20120068640 | FLUX OFFSET COMPENSATION FOR A ROTATING ELECTRICAL MACHINE - A method is provided for compensating the flux drift caused by measurement and/or calculation errors when controlling a rotating electrical machine. The flux drift of the estimated flux vector may be compensated for by comparing the length of the flux vector with a reference flux magnitude which already has been determined for controlling the inverter. Depending on the comparison, the length of the estimated flux vector may be lengthened or shortened. | 03-22-2012 |
| 20120068641 | CONTROL DEVICE FOR ELECTRIC ROTATING MACHINE - A control device has a predicting unit for predicting a first current flowing through a motor in a next control period, at a predicting time during a predetermined period after a change of switching state in an inverter by using a current detected before the change and for predicting a second current of a control period later than the next control period by one control period by using the predicted first current, a determining unit for determining a next operating state of the inverter by using the predicted second current and an instructed value so as to reduce a change of switching state in the change of the operating state, and a control unit for controlling the inverter to be set in the determined operating state in the next control period and controlling the current of the motor depending on the operating state of the inverter. | 03-22-2012 |
| 20120119686 | Method for controlling a motor - A method for controlling a motor by an inverter and by a vectorial technique, comprising the following steps: determining the value of a quadrature current Iq necessary for said motor to generate the desired torque; calculating the value of a direct current to be supplied to the motor by an equation as a function of the phase of the current vector on which the torque constant of the motor depends; calculating the power current of said motor from the direct current and the quadrature current; supplying the power current to the motor through the inverter. | 05-17-2012 |
| 20120139459 | SYSTEM FOR CONTROLLING MOTOR OF HYBRID VEHICLE - A system for controlling a motor of a hybrid vehicle that secures robustness and stability of control by selecting an optimal approximation model according to a driving condition of the motor and determines current order for controlling the motor by using the selected optimal approximation model is disclosed. In particular, a current order generator utilizes a reference current determination module to determine reference currents of the first and second axes, a compensation value determination module to determine compensation values of the reference currents of the first and second axes, and a current determination module to determine the currents of the first and second axes from the reference currents of the first and second axes and the compensation values of the reference currents of the first and second axes in order to control the motor more efficiently. | 06-07-2012 |
| 20120139460 | APPARATUS FOR CARRYING OUT IMPROVED CONTROL OF ROTARY MACHINE - In a system for controlling a rotary machine, a circuit outputs an AC voltage to be applied to a rotary machine. A storage stores therein measurement-error information indicative of a measurement error of the measuring unit. A torque-feedback adjuster manipulates a phase of the output voltage of the circuit based on the rotational angle of the rotary machine measured by a measuring unit and the measurement-error information to adjust a torque of the rotary machine to a request torque. The phase is obtained from information fed back from the rotary machine. An abnormality determiner determines whether there is an abnormality to disable using accurate measurement-error information. A limiter limits adjustment of the torque of the rotary machine to the request torque by the torque-feedback adjuster when it is determined that there is an abnormality to disable using accurate measurement-error information. | 06-07-2012 |
| 20120139461 | POWER CONVERSION DEVICE FOR A ROTARY ELECTRIC MACHINE - A power conversion device includes an inverter unit and a control unit. The inverter unit includes high SWs and low SWs for each phase of coils of a motor. The control unit, in a case that the on-time of the high SWs and the low SWs is shorter than a predetermined time determined based on a dead time, changes an output voltage average value such that the on-time of the high SWs or the on-time of the low SWs becomes longer than the predetermined time. The voltage use rate can be improved without disposing a special circuit, and distortion of inter-line voltages or distortion of currents can be suppressed. | 06-07-2012 |
| 20120146559 | ESTIMATION OF ACTUAL TORQUE IN AN ELECTRICAL MOTOR DRIVE - It is presented a control device for driving an electric motor, wherein a drive control signal for the electric motor is arranged to be determined using a calculated rotor flux. A direct quadrature, dq, coordinate system relating to a rotor of the electric motor is used. The control device comprises a flux estimator arranged to determine the calculated rotor flux using a quadrature axis voltage, a measured direct axis current, a measured quadrature axis current, an angular velocity, stator resistance and a direct axis inductance and an actual torque calculator arranged to obtain an actual torque estimation using the calculated rotor flux, the measured direct axis current and the measured quadrature axis current. A corresponding method is also presented. | 06-14-2012 |
| 20120153881 | VECTOR CONTROL METHOD FOR ELECTRIC MOTORS - A vector control method for electric motors, characterized in that it comprises the steps of: supplying a reference vector (Vout | 06-21-2012 |
| 20120176068 | ROTATING MACHINE CONTROLLER - In a norm setting section, a norm of an output voltage vector of an inverter is set based on a required torque and an electrical angle speed. In a phase setting section, a phase is set as controlled variables for performing a feedback control of an estimated torque to the required torque. In an operation signal generating section, operation signals are generated based on the norm set by the norm setting section and the phase set by the phase setting section, and the signals are outputted to the inverter. Based on the value of the phase, existence of abnormalities of a permanent magnet of a motor-generator is determined. | 07-12-2012 |
| 20120176069 | ELECTRIC POWER STEERING APPARATUS - An electric power steering apparatus detects, as an abnormal phase, a phase other than a combination of phases whose interphase voltage is of nearly zero volts if a q-axis current is equal to or smaller than a first threshold value though a q-axis voltage is being applied. Alternatively, the electric power steering apparatus calculates a base electric angle at which the q-axis current is equal to or smaller than a third threshold value though the q-axis voltage is being applied, and determines an abnormal phase based on the base electric angle. | 07-12-2012 |
| 20120187876 | METHODS, SYSTEMS AND APPARATUS FOR CONTROLLING THIRD HARMONIC VOLTAGE WHEN OPERATING A MULTI-PHASE MACHINE IN AN OVERMODULATION REGION - Methods, system and apparatus are provided for controlling third harmonic voltages when operating a multi-phase machine in an overmodulation region. The multi-phase machine can be, for example, a five-phase machine in a vector controlled motor drive system that includes a five-phase PWM controlled inverter module that drives the five-phase machine. Techniques for overmodulating a reference voltage vector are provided. For example, when the reference voltage vector is determined to be within the overmodulation region, an angle of the reference voltage vector can be modified to generate a reference voltage overmodulation control angle, and a magnitude of the reference voltage vector can be modified, based on the reference voltage overmodulation control angle, to generate a modified magnitude of the reference voltage vector. By modifying the reference voltage vector, voltage command signals that control a five-phase inverter module can be optimized to increase output voltages generated by the five-phase inverter module. | 07-26-2012 |
| 20120187877 | MOTOR AND DRIVE SYSTEM PROVIDED THEREWITH - A three-phase AC motor ( | 07-26-2012 |
| 20120194108 | MOTOR SYSTEM - A motor system comprises a motor ( | 08-02-2012 |
| 20120212162 | METHOD AND SYSTEM FOR CONTROLLING AN ELECTRIC MOTOR WITH COMPENSATION FOR TIME DELAY IN POSITION DETERMINATION - A sensor detects position data for a rotor of the motor at a first time. A data processor receives the detected position data associated with a first time delay. A sensing circuit senses an analog current at the motor during a second time delay. An analog-to-digital converter converts the analog current to a digital current data during a third time delay. The fourth time delay is detected between actual current reading instant and position reading instant in a data processor. The digital phase current data is transformed into measured direct and quadrature axes control current data based on synchronization or temporal alignment of the position data with the actual measured analog phase current at the starting time by compensating the position data by a sum of the second time delay, the third time delay and the fourth time delay, where the first time delay is subtracted from the sum. | 08-23-2012 |
| 20120212163 | POWER CONVERSION APPARATUS OF ELECTRIC VEHICLE - A power conversion apparatus of an electric vehicle includes: a power converter for driving an induction machine based on arbitrary d- and q-axis voltage commands Vd* and Vq*, and a control unit for controlling the power converter based on a power running command P and a brake command B from outside. The control unit includes: a dq/three-phase conversion unit for converting phase current information iu, iv, and iw detected from the induction machine into d- and q-axis current detection values id and iq on orthogonal rotating coordinates; a speed determination unit for computing d- and q-axis voltage commands Vd* and Vq* for the power converter and determines that speed of the induction machine is zero based on the power running command P, the brake command B, and the B- and q-axis current detection values id and iq; and a resistance computing unit for computing a resistance value of the induction machine based on the power running command P, the d-axis current detection value id, and the d-axis voltage command Vd* when the brake command B is changed to the power running command P and the speed determination unit determines that the speed of the induction machine is zero. | 08-23-2012 |
| 20120217908 | METHOD AND SYSTEM FOR CONTROLLING AN ELECTRIC MOTOR AT OR NEAR STALL CONDITIONS - A data processor determines whether a composite torque command is larger than a preset torque threshold for a time interval. The composite torque command is convertible into a direct-axis current command and a quadrature-axis current command. The data processor determines whether a rotor speed of the motor is less than a preset speed threshold for the time interval. The data processor, the current adjustment module, or the current shaping module adjusts the direct-axis current command and the quadrature-axis current command to obtain a revised direct-axis current command and revised quadrature-axis current command for the time interval if the composite torque command is larger than the preset torque threshold and if the rotor speed is less than the preset speed threshold, where the revised current commands vary by the detected rotational position of the rotor to achieve a generally constant shaft torque output. | 08-30-2012 |
| 20120217909 | Synchronization of Position and Current Measurements in an Electric Motor Control Application using an FPGA - A system and method for controlling an alternating current (AC) motor using a Field Programmable Gate Array (FPGA) to read the current and position measurements in an the AC motor, perform digital filtering of the position and current data, provide very precise synchronization of the measured phase current and position data, and output the data to a phase converter for control of the AC motor. | 08-30-2012 |
| 20120217910 | MOTOR CONTROL DEVICE, CONTROL PROGRAM THEREFOR, AND METHOD FOR THE CONTROL - A motor control device determines a rotation angle and an angular speed of a motor, and has: a correcting unit including N number (N is an positive integer equal to or more than 2) of bit-shift circuits, which divide the angular speed by powers of 2 by bit shift, and a circuit, which subtracts output values of the second to Nth bit-shift circuits from an output value of the first bit-shift circuit to determine a correction amount for the rotation angle and correct the rotation angle by the correction amount; so as to determine two-phase direct voltages to obtain a target torque from the three-phase alternate currents passing through the motor according to the angular speed, and convert the two-phase direct voltages into the three-phase alternate voltages according to the sine, cosine of the corrected rotation angle. | 08-30-2012 |
| 20120229058 | DEVICE AND METHOD OF STOPPING INDUCTION MOTOR - Provided are a device and method of stopping an induction motor. The includes: a frequency commanding unit for generating an operating frequency corresponding to a rotational speed command of the induction motor; a q-axis and d-axis V/F converter for outputting a first q-axis voltage (Vq | 09-13-2012 |
| 20120235609 | MOTOR CONTROL DEVICE - A motor control device includes a current profile generator generating a current profile, a pilot voltage operator calculating a pilot pulse voltage, on the basis of the current profile, and adding the pilot pulse voltage to a voltage command on a d axis, a magnetic pole position detector detecting a position of a magnetic pole in the permanent magnet motor, on the basis of the pilot pulse voltage, a polarity identification evaluation current operator calculating a polarity identification evaluation current for identifying a polarity of the magnetic pole in the permanent magnet motor, on the basis of a current value on the d axis in the motor current that has been detected in synchronization with a period of PWM control, and a polarity detector outputting a phase correction amount, on the basis of a deviation between the polarity identification evaluation current and the current profile. | 09-20-2012 |
| 20120242260 | CONTROL METHOD AND CONTROL DEVICE OF MOTOR INVERTER - A motor inverter is provided with switching elements for each phase of a 3-phase motor, and driving the motor by turning on and off the switching elements. In an example of a control device of the motor inverter, the control device includes: a stationary phase determination unit for defining a phase in a plurality of phases provided with switching elements for each area as a stationary phase in which a switching operation is not performed, based on current command value of each phase acquired from d-axis current command value and q-axis current command value of the motor, with one rotation in electrical angle of a rotor of the motor divided into a plurality of areas; and a drive unit for performing the switching operation of switching elements of the phases other than the stationary phase determined for each area to perform, and realizing 2-phase modulation control. | 09-27-2012 |
| 20120249024 | ELECTRIC MOTOR CONTROL DEVICE - An electric motor control device includes a mode in which an inverter is controlled by a current phase of an armature current in a 2-axis orthogonal vector space, a vector being obtained by synthesizing a field and a drive current along two axes defining the vector space; a high-loss control section that, when extra power results from charging a power storage device, varies the field current in accordance with the extra power to increase the armature current while maintaining torque of an AC electric motor; and the high-loss control section varies the field current to one of a field weakening and a field intensifying side of the electric motor, which results in the higher power loss within a range in which the armature current can be output in the vector space and which is determined based on the DC power source voltage and a rotational speed of the electric motor. | 10-04-2012 |
| 20120249025 | DETECTION DEVICE FOR DETECTING MAGNETIC POLE POSITION OF SYNCHRONOUS MOTOR, AND CONTROL APPARATUS EQUIPPED THEREWITH - A detection device for detecting a magnetic pole position of a synchronous motor includes a generating unit for generating a magnetic pole correction value based on the difference between a forward rotation d-phase voltage command and a reverse rotation d-phase voltage command, the d-phase voltage commands being used for rotating the synchronous motor and generated when the synchronous motor is driven in forward and reverse directions, respectively, by applying a prescribed d-phase current command after detecting a magnetic pole initial position at power-on of the synchronous motor, and a correcting unit for correcting the magnetic pole initial position based on the magnetic pole correction value and on a sensor reference position which defines a reference position of a sensor attached to the synchronous motor, and a control apparatus equipped with the detection device controls the rotation of the synchronous motor based on the corrected magnetic pole initial position. | 10-04-2012 |
| 20120268046 | CONTROL DEVICE FOR ALTERNATING CURRENT MOTOR - A control device for an alternating current motor according to embodiments includes a current distributor and a phase estimator. The current distributor divides a torque command by using a control phase and outputs a component that contributes to a mechanical output of the motor as a δ-axis current command and a component that does not contribute to the mechanical output as a γ-axis current command. The phase estimator computes a phase at which a γ-axis component of an addition amount of the output of the current controller and a voltage drop amount of inductance of the motor becomes zero and outputs the computed phase as the control phase. | 10-25-2012 |
| 20120306411 | TORQUE RIPPLE SUPPRESSION CONTROL APPARATUS AND TORQUE RIPPLE SUPPRESSION CONTROL METHOD FOR ROTATING ELECTRICAL MACHINE - A periodic disturbance observer determines real part Î | 12-06-2012 |
| 20120319628 | Method For Controlling A Machine Or An Electrical Load Supplied With Electric Power Over A Long Line - A drive controller arranged to provide electrical power from a power supply to a machine or load over a long AC power cable of the order of kilometers. The drive controller is arranged with circuits and/or control processes to provide AC current at a constant ratio of voltage and frequency to said machine or load. The drive controller maintains voltage and frequency at the machine terminals despite fluctuations in voltage and/or frequency that would ordinarily be caused by the load. This is done by estimating the voltage and current at the machine terminals and adapting the drive controller output accordingly to actively vary the converter output dependent on the load of the machine or other load. In other aspects of the invention a method and a computer program for carrying out the method are described. | 12-20-2012 |
| 20120319629 | INVERTER DEVICE AND CONTROL METHOD THEREOF - This inverter device includes a power portion performing PWM control on a voltage command to a motor for each set time period, converting direct-current power into alternating-current power, and outputting the same, a voltage command generation portion generating a voltage command in synchronization with a period N-times (N≧1) longer than the time period, an interval determination portion generating an interval determination signal which is ON during a half period of the time period and OFF during the next half period, a current detection portion detecting the current of the motor at timing of change in the interval determination signal, and a voltage correction portion generating a voltage correction value such that the amount of change in the detected current when the interval determination signal is ON becomes equal to the amount of change in the detected current when it is OFF and correcting the voltage command. | 12-20-2012 |
| 20120326639 | Sensorless Optimum Torque Control For High Efficiency Ironless Permanent Magnet Machine - Embodiments of the present invention permit the optimization of torque control of a permanent magnet machine including obtaining instantaneous terminal voltages of the machine, transforming the instantaneous terminal voltages to a zero direct axis voltage and a non-zero quadrature axis voltage, using a mathematical transformation, regulating the electrical frequency of the permanent-magnet machine such that the zero direct-axis voltage is adjusted to have a value of zero, determining a non-final electrical angle of the permanent-magnet machine by applying an integrator to the regulated electrical frequency of the machine, determining a final electrical angle of the of the machine by integrating the non-final electrical angle and an electrical angle from a previous calculation cycle, and regulating the current vector of the machine such that the current vector is perpendicular to the final electrical angle of the machine, thereby optimizing the torque of the machine. | 12-27-2012 |
| 20130009574 | APPARATUS FOR OPERATING INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR - Provided is an apparatus for operating interior permanent magnet synchronous motor in a system including a detector measuring a position and a speed of a rotor of an IPMSM, the apparatus including an output unit generating and outputting a current command driving a MTPA (Maximum Torque Per Ampere) based on the command torque, a correction unit correcting the current command outputted by the output unit, a feedback unit transmitting over-modulated voltage information to the correction unit, a control unit controlling the current command to output a voltage, a first limit unit limiting an output of the control unit using a maximum voltage synthesizable by an inverter unit, and the inverter unit applying a 3-phase voltage command for tracking a command torque to the IPMSM using an output of the first limit unit. | 01-10-2013 |
| 20130009575 | APPARATUS FOR OPERATING INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR - Provided is an apparatus for operating interior permanent magnet synchronous motor by receiving a first current command of a flux weakening control region I in a system including a detector measuring a position and a speed of a rotor of an IPMSM, the apparatus including a feedback unit transmitting over-modulated voltage information to a correction unit, the correction unit using the rotor speed and the over-modulated voltage information to correct the first current command to a second current command of a flux weakening control region II, a control unit controlling the second current command to output a voltage, a first limit unit limiting an output of the control unit to a maximum voltage synthesizable by an inverter unit, and the inverter unit applying a 3-phase voltage command for following a command torque to the IPMSM using an output of a voltage limit unit. | 01-10-2013 |
| 20130015793 | METHOD AND APPARATUS FOR SPACE VECTOR PULSE WIDTH MODULATION OF A THREE-PHASE CURRENT CONSTRUCTION WITH SINGLE DC-LINK SHUNTAANM Qin; LingAACI HoustonAAST TXAACO USAAGP Qin; Ling Houston TX USAANM Akin; BilalAACI StaffordAAST TXAACO USAAGP Akin; Bilal Stafford TX US - A method for driving a motor having a plurality of phases is provided. Initially, first, second, and third intervals for a pulse width modulation (PWM) period from first and second voltage commands are generated. The first and second voltage commands correspond to a voltage vector for the motor, and the voltage vector has an associated sector. A conversion formula is then determined for the first, second, third intervals based on the associated sector for the voltage vector. Using the conversion formula and the first, second, and third intervals, fourth, fifth, and sixth intervals are generated, and a set of PWM signals for the PWM period is generated from the fourth, fifth, and sixth intervals. The motor is then driven with the second set of PWM signals, and a current traversing the plurality of phases with a single shunt is measured. | 01-17-2013 |
| 20130020971 | TEMPERATURE COMPENSATION FOR IMPROVED FIELD WEAKENING ACCURACY - Methods and apparatus are provided for rotor and stator temperature compensation for field weakening current. The method comprises generating a phase voltage feed back signal V | 01-24-2013 |
| 20130033205 | Power Conversion Device - A control circuit of a power conversion device calculates voltage command signals for determining timings for making switching elements of a power switching circuit continuous by performing feed forward control on the basis of input information, and feedback control on the basis of the input information and current values of AC output, for each of the d axis and the q axis of a motor. | 02-07-2013 |
| 20130033206 | METHODS, SYSTEMS AND APPARATUS FOR ADJUSTING MODULATION INDEX TO IMPROVE LINEARITY OF PHASE VOLTAGE COMMANDS - Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a motor drive system. The disclosed embodiments provide a mechanism for adjusting modulation index of voltage commands to improve linearity of the voltage commands. | 02-07-2013 |
| 20130038256 | ROTARY MACHINE CONTROL APPARATUS - A current sensor detects a bus current flowing to an inverter. An estimation section uses actual currents id and id outputted from a d-q conversion section as initial values, estimates currents flowing in a motor/generator and calculates estimated currents ide and iqe. A UVW conversion section converts the estimated current ide and iqe to three phase currents. A selection section inputs, as currents flowing in each phase of the motor/generator, three out of outputs of the UVW conversion section and the bus current. The bus current is used as the current of one phase, if a voltage vector representing an operation state of the inverter is an effective voltage vector. | 02-14-2013 |
| 20130043811 | FIELD ORIENTED CONTROL OF A MOTOR WITH A SINGLE SHUNT - A method for driving a motor is provided. Pulse width modulation (PWM) signals are generated from a voltage signal and a commanded angle signal, which drives a motor with multiple phases. A motor current from a motor is measured with a single shunt and converted into a digital signal. Based on the digital signal and the commanded angle signal, direct-axis and quadrant-axis currents for the motor can be determined, and the voltage signal and the commanded angle signal can be adjusted based at least in part on the direct-axis and quadrant-axis currents. | 02-21-2013 |
| 20130057184 | METHOD AND APPARATUS FOR DRIVING ALTERNATING-CURRENT MOTOR - A method of driving an alternating-current (AC) motor while periodically obtaining a rotator angle of the AC motor. The method includes: (a) driving the AC motor by a d | 03-07-2013 |
| 20130063056 | CONTROL SYSTEM FOR A ROTARY MACHIINE - An estimation section estimates a time period required for a norm of a difference vector between a current flowing to a motor/generator and a command current to attain a threshold level r in each switching mode provisionally set by a mode setting section. A mode determination section determines the switching mode of the longest required time period to be a final switching mode. A drive section controls an inverter to operate in the switching mode determined by the mode switching section. | 03-14-2013 |
| 20130063057 | CONTROL SYSTEM FOR A ROTARY MACHINE - An estimation section calculates estimated currents corresponding to switching modes, which are provisionally set by a mode setting section. A mode determination section determines one of modes, which has a smallest difference between the estimated currents and command currents, to be a final switching mode. A drive section drives an inverter in the switching mode determined by the determination section. The estimation section uses transient-state inductances as coefficients of time differentiation of currents in voltage equations used for estimation of the estimated currents. These are different from steady-state inductances, which are coefficients of multiplication of currents and electric angular velocity. | 03-14-2013 |
| 20130069568 | System and Method for Controlling a Permanent Magnet Motor - A system. The system includes a processor, a first module, a second module and a third module. The first module is communicably connected to the processor and is configured for calculating a q-axis voltage component and a d-axis voltage component. The second module is communicably connected to the processor and is configured for determining a voltage angle relative to the q-axis. The third module is communicably connected to the processor and is configured for (1) comparing the determined voltage angle to a predetermined value, (2) outputting the determined voltage angle if the determined voltage angle is less than the predetermined value, and (3) outputting the predetermined value if the predetermined value is less than the determined voltage angle. | 03-21-2013 |
| 20130088179 | SYNCHRONOUS MACHINE CONTROL APPARATUS - A control command generator that generates an armature interlinkage flux command and a torque current command by a torque command, a rotation speed, and an operation target command, includes a first flux command generator generating a first flux command by the toque command or the torque current command, a second flux generator generating a second flux command by the torque command or the torque current command and the rotation speed of the synchronous machine, a command allocation setting unit setting an allocation coefficient equivalent to an allocation ratio of the two first and second flux commands by the operation target command, a flux command adjuster outputting an armature interlinkage flux command by the two flux commands and the allocation coefficient, and a torque current command generator generating the torque current command by the torque command and the armature interlinkage flux command. | 04-11-2013 |
| 20130093369 | CONTROLLING TORQUE RIPPLE IN INTERIOR PERMANENT MAGNET MACHINES - A system for controlling a vehicle, the vehicle including a permanent magnet (PM) synchronous motor, includes a controller. The controller is configured to control the motor with a motor current. In the presence of a predetermined condition, the motor current results in increased winding loss and reduced torque ripple with respect to optimal motor current for minimal winding loss. | 04-18-2013 |
| 20130093370 | PARAMETER ESTIMATING APPARATUS FOR PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVING SYSTEM - A parameter estimating apparatus for permanent magnet synchronous motor driving system is disclosed, the apparatus estimating an inductance and a magnet flux linkage of a permanent magnet through a real-time magnetic flux estimation, whereby an operation performance of the PMSM can be enhanced. | 04-18-2013 |
| 20130093371 | MOTOR CONTROL DEVICE THAT CONTROLS d-AXIS CURRENT OF PERMANENT MAGNET SYNCHRONOUS MOTOR - A motor control device that performs vector control to control a q-axis current and a d-axis current of a permanent magnet synchronous motor independent from each other. The motor control device includes a q-axis current and d-axis current detection unit configured to detect a q-axis current and a d-axis current of a permanent magnet synchronous motor, a q-axis current command value generation unit configured to generate a q-axis current command value, a d-axis current command value generation unit configured to generate a d-axis current command value, in which an amount of rise in the temperature of permanent magnets in a steady state of the permanent magnet synchronous motor is a minimum, and a drive unit configured to drive the permanent magnet synchronous motor. | 04-18-2013 |
| 20130113398 | CONTROL APPARATUS FOR AC ROTARY MACHINE - A control apparatus for an AC rotary machine includes: a current detection section detecting current from a power converter to the AC rotary machine; and a control section generating a three-phase AC voltage instruction to the power converter, based on current detected by the current detection section and a torque instruction. The control section includes: an observer calculating a magnetic flux estimated value of the AC rotary machine, based on detected current and the voltage instruction; a current instruction calculation unit calculating current instruction values on rotational two axes, based on the torque instruction and the magnetic flux estimated value from the observer; and a voltage instruction calculation unit calculating the voltage instruction, based on the current instruction values from the current instruction calculation unit and the magnetic flux estimated value from the observer. | 05-09-2013 |
| 20130113399 | CONTROL APPARATUS AND CONTROL METHOD FOR AC ROTARY MACHINE - A control apparatus for an AC rotary machine includes a control circuit, a power converter, a current detector, and a voltage detector. The control circuit includes: an activation current instruction unit which generates a current instruction for activation; and a start phase setting unit which sets an initial rotation phase for activation control, based on the rotation direction of the AC rotary machine just after activation and on the polarity of current detected by the current detector just after activation. Thus, the current amplitude and torque shock just after activation control is started can be reduced, and assured and stable reactivation is allowed without causing the protection operation. | 05-09-2013 |
| 20130119900 | MOTOR TORQUE RIPPLE COMPENSATION - A system for controlling a vehicle, the vehicle including an electric machine, includes a controller. The controller is configured to control the electric machine with an electric machine current including a plurality of current harmonic components. At least two of the current harmonic components have different magnitudes. When a torque ripple of the electric machine is an electrical k-th order harmonic, the plurality of current harmonic components may include an electrical k-1 order harmonic component having a first magnitude and an electrical k+1 order harmonic component having a second magnitude different than the first magnitude. | 05-16-2013 |
| 20130141023 | MOTOR CONTROLLING APPARATUS - A motor controlling apparatus including an inverter, a voltage detector, a rotational speed detector, a command value calculating component, an inverter controller, a state detector and an offsetting component. The inverter converts direct-current power to alternating-current power supplied to a motor. The voltage detector detects a direct-current voltage, and the rotational speed detector detects a rotational speed of the motor. The calculating component calculates current and torque command values, and motor rotational speed. The controller provides a control signal to control the inverter based on the current command value. The state detector detects a control state of the inverter, and the offsetting component offsets the detected voltage or rotational speed by an offset amount. The calculating component modifies the current command value based on the offset detected voltage or rotational speed to increase on a negative side a d-axis current command value included in the current command value. | 06-06-2013 |
| 20130169201 | METHODS, SYSTEMS AND APPARATUS FOR CONTROLLING OPERATION OF AN ELECTRIC MACHINE IN AN OVERMODULATION REGION - Embodiments of the present disclosure relate to methods, systems and apparatus for controlling operation of an electric machine in a vector controlled motor drive system when the electric machine operates in an overmodulation region. The disclosed embodiments can reduce variations/errors in the phase voltage command signals applied to the multi-phase machine so that phase current may be properly regulated thus reducing current/torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source. | 07-04-2013 |
| 20130169202 | METHODS, SYSTEMS AND APPARATUS FOR GENERATING VOLTAGE COMMANDS USED TO CONTROL OPERATION OF A PERMANENT MAGNET MACHINE - Methods, systems and apparatus are provided for generating voltage commands used to control operation of a permanent magnet machine. For example, a control system is provided that generates voltage command signals for controlling a permanent magnet machine during a transition from an initial operating condition to a final operating condition. The control system includes a processor configured to execute software instructions, and a memory configured to store software instructions accessible by the processor. The software instructions comprise a voltage command generator module. Based on an electrical angular frequency of the permanent magnet machine, and synchronous reference frame current signals, the voltage command generator module is configured to generate ramped voltage command signals that each change linearly in accordance with a slope during a transition period that is set to a rise time. | 07-04-2013 |
| 20130169203 | APPARATUS FOR CONTROLLING INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR - Disclosed is an apparatus for controlling an IPMSM, the apparatus according to exemplary embodiments of the present disclosure including a first generating unit generating a q-axis reference voltage of a synchronous reference frame from a reference frequency, a current converter generating a current of the synchronous reference frame from a 3-phase current of the IPMSM, and a voltage controller generating a d-axis reference voltage compensating a voltage in response to a load change. | 07-04-2013 |
| 20130175955 | METHOD AND SYSTEM FOR SENSORLESS CONTROL OF AN ELECTRIC MOTOR - Methods and systems for controlling an electric motor are provided. An estimated rotor flux angular position error is generated based on estimated back electromotive force (EMF) values, and based on the estimated rotor flux angular position error, an estimated rotor flux angular position, an estimated electrical synchronous frequency and/or an estimated rotor frequency can be generated. | 07-11-2013 |
| 20130181642 | METHOD AND SYSTEM FOR CONTROLLING AN ELECTRIC MOTOR FOR A VEHICLE - A system and method for calibrating an interior permanent magnet (IPM) motor with an optimized maximum torque per ampere trajectory curve. The system and method use a real-time particle swarm technique that requires less known parameters than standard maximum torque per ampere trajectory techniques. | 07-18-2013 |
| 20130187579 | MOTOR DRIVE FOR PERMANENT MAGNET SYNCHRONOUS MOTOR - A pulse-width modulation (PWM) inverter controller compensates for harmonics in the output current provided by a PWM inverter to permanent magnet (PM) motor. The PWM inverter controller includes a field-oriented controller (FOC) that monitors output currents provided by the PWM inverter to the PM motor and employs the monitored output currents in a current loop feedback that generates control signals. A harmonic compensator transforms monitored phase currents into rectangular waveforms having magnitudes modified based on detected harmonics within the monitored phase currents to generate compensation signals. The compensation signals generated by the harmonic compensator are summed with the control signals generated by the FOC to generate compensated control signals. A PWM signal generator generates PWM signals for controlling the PWM inverter based on the compensated control signals. | 07-25-2013 |
| 20130207579 | METHOD AND SYSTEM FOR ESTIMATING ELECTRICAL ANGULAR SPEED OF A PERMANENT MAGNET MACHINE - Methods, systems and apparatus are provided for estimating electrical angular speed of a permanent magnet machine based on two-phase stationary reference frame feedback stator current samples, and a dimensionless gain (K) that is computed based on a sampling time (T) and machine parameters. | 08-15-2013 |
| 20130214709 | AC MOTOR CONTROL APPARATUS - A motor control circuit calculates an α-axis current iα and a β-axis current iβ in a fixed coordinate system based on a W-phase (sensor phase) of an AC motor. The control circuit calculates the α-axis current iα from a current iw.sns sensed in the W-phase, and the β-axis current iβ from a differentiated value Δiα determined from the variation quantity of the α-axis current based on that the α-axis current iα and the β-axis current iβ are in a relation of a sine wave and a cosine wave. Subsequently, the control circuit calculates a current phase xθ=tan | 08-22-2013 |
| 20130214710 | AC MOTOR CONTROL APPARATUS - A motor control circuit calculates an α-axis current iα and a β-axis current iβ in a fixed coordinate system based on a W-phase (sensor phase) of an AC motor. The control circuit calculates, at each switching time point and each intermediate time point, the α-axis current iα from a current iw.sns sensed in the W-phase, and the β-axis current iβ from a differentiated value Δiα determined from the variation quantity of the α-axis current between every two successive switching time points or intermediate time points. Subsequently, the control circuit calculates a current phase xθ=tan | 08-22-2013 |
| 20130214711 | AC MOTOR CONTROL APPARATUS - A motor control circuit calculates, based on a sensed current of a sensor phase sensed by a current sensor, an estimated current of the other phase and calculates a d-axis and a q-axis estimated currents based on the sensed current of the sensor phase and the estimated current of the other phase. The motor control circuit further calculates a d-axis and a q-axis command voltages based on the estimated currents thereby to control power supply to the AC motor. When the sensed current of the sensor phase is 0 [A], the command voltages are fixed and the estimated current is interpolated. Thus, variations of the command voltages caused by an error in the estimated current are reduced and a rapid change in the estimated current is reduced. | 08-22-2013 |
| 20130214712 | AC MOTOR CONTROL APPARATUS - A reference current phase sensing part of a sensor phase (W) calculates an α-axis current iα and a β-axis current iβ in a fixed coordinate system formed with respect to a sensor phase as a base. The α-axis current iα is calculated based on a sensed current iw.sns of the sensor phase and a β-axis current iβ is calculated based on command currents iu* and iv* of the other two phases (U, V) determined from a d-axis command current id* and a q-axis command current iq*. Then a current phase xθ=tan | 08-22-2013 |
| 20130214713 | CONTROLLER FOR AC MOTOR - A controller for a three-phase AC motor includes a current sensor and a current estimation section. The current sensor detects current flowing through one phase of the motor. The one phase is defined as a sensor phase. The current estimation section calculates a current phase relative to an axis of the sensor phase based on α-axis current and β-axis current in a stationary coordinate system defined by a α-axis parallel to the sensor phase axis and a β-phase perpendicular to the sensor phase axis. The current estimation section estimates current flowing through another phase of the motor based on the current phase and the detected current. The current estimation section calculates the α-axis current based on the detected current. The current estimation section calculates the β-axis current based on the detected current and a command value for the current flowing through the other phase of the motor. | 08-22-2013 |
| 20130221879 | METHOD OF CONTROLLING A CURRENT OF A MOTOR AND CONTROL DEVICE OF A MOTOR - The present invention is a control device of a motor, for drawing out a capacity of the motor as much as possible so as to achieve a high-speed high-output performance thereof while securing a stability, including: a converter unit configured to rectify and smooth an AC voltage, and to output a DC main circuit voltage; an inverter unit configured to pass a current for driving the motor, with the use of the main circuit voltage; a current detector configured to detect an armature current passing through the motor; a position detector disposed on the motor, the position detector being configured to detect a motor speed; and a current control unit configured to control, upon reception of a q-axis current command (Iqr), the armature current passing through the motor, by outputting a signal for driving the inverter unit, with the use of data from the current detector and data from the position detector. | 08-29-2013 |
| 20130249448 | SYNCHRONOUS MACHINE CONTROL APPARATUS - A synchronous machine control apparatus is characterized by including a magnet condition estimation unit ( | 09-26-2013 |
| 20130249449 | SYNCHRONOUS MOTOR CONTROL APPARATUS - A control apparatus includes, a first calculating unit which calculates first d-phase and q-phase current limit candidate values, a second calculating unit which calculates second d-phase and q-phase current limit candidate values, a q-phase unit which, when the absolute value of the first d-phase current limit candidate value is smaller than that of the second d-phase current limit candidate value, sets the first q-phase current limit candidate value as a q-phase current limit value, but otherwise sets the second q-phase current limit candidate value as the q-phase current limit value, and a d-phase unit which, when the absolute value of the first d-phase current limit candidate value is smaller than that of the second d-phase current limit candidate value, sets the first d-phase current limit candidate value as a d-phase current limit value, but otherwise sets the second d-phase current limit candidate value as the d-phase current limit value. | 09-26-2013 |
| 20130249450 | SENSORLESS CONTROL APPARATUSES AND CONTROL METHODS THEREOF - A sensorless control apparatus may include: a speed command unit configured to output a speed command to an electric motor; a current detector unit configured to detect electric current flowing through the electric motor if a voltage being output according to the speed command is supplied to the electric motor; a rotor angle calculation unit configured to calculate a magnetic flux of a rotor of the electric motor based on the detected electric current and the voltage being output according to the speed command, and to calculate an angle of the rotor from the calculated magnetic flux; and/or an out-of-step sensing unit configured to sense an out-of-step of the rotor according to a comparison of the calculated angle of the rotor with an angle of the rotor estimated based on a sensorless control algorithm. | 09-26-2013 |
| 20130257324 | MOTOR CONTROL DEVICE - A motor control device includes a torque computing section which computes an output torque of an electric motor which is capable of generating magnetic torque by permanent magnets and reluctance torque, a flux weakening angle computing section which determines an angle of a flux weakening current vector that is added to a reference current vector so that a command torque value and the computed torque value correspond with each other, a voltage acquiring section which acquires a terminal voltage of the motor, a flux weakening amplitude computing section which determines an amplitude of the flux weakening current vector so that the terminal voltage of the motor is not more than a maximum voltage applicable to the motor, and a command current computing section which computes a command current vector by adding the flux weakening current vector to the reference current vector. | 10-03-2013 |
| 20130257325 | METHOD FOR CONTROLLING ROTATION RATE OF ELECTRIC MOTOR - A method for controlling a rotation rate of an electric motor includes the s following steps: determining if an absolute value of a difference between an objective rotation rate of the electric motor and an actual rotation rate of the electric motor is greater than or equal to a predetermined value, and if yes, compensating a q axis current of the electric motor to adjust the rotation rate. | 10-03-2013 |
| 20130264977 | CONTROL ELECTRONICS FOR BRUSHLESS MOTORS - An electronic control circuit for a brushless motor has an input power circuit providing a DC voltage and a microcontroller integrated circuit receiving the DC voltage. The microcontroller integrated circuit provides three-phase control signals according to a space vector control method. A microprocessor connected to the microcontroller integrated circuit executes supervisory control over the electronic control circuit. An inverter circuit receives the three-phase control signals from the microcontroller integrated circuit and provides driving signals to the brushless motor based on the three-phase control signals received from the microcontroller integrated circuit. | 10-10-2013 |
| 20130271048 | SYNCHRONOUS MOTOR CONTROL DEVICE FOR CONTROLLING SYNCHRONOUS MOTOR TO CARRY OUT POWER REGENERATIVE OPERATION AND STOP SYNCHRONOUS MOTOR AT THE TIME OF POWER FAILURE - A second q-axis current command value, which is set by a q-axis current command value setting unit when an alternating-current power source fails at the time of driving of a synchronous motor, and a second d-axis current command value, which is set by a d-axis current command value setting unit when the alternating-current power source fails at the time of the driving of the synchronous motor, are set so that an absolute value of power per unit time of the synchronous motor is equal to loss per unit time of the synchronous motor. | 10-17-2013 |
| 20130278182 | METHODS, SYSTEMS AND APPARATUS FOR GENERATING VOLTAGE COMMANDS USED TO CONTROL OPERATION OF A PERMANENT MAGNET MACHINE - Embodiments of the present disclosure relate to methods, systems and apparatus for generating voltage commands used to control operation of a permanent magnet machine. | 10-24-2013 |
| 20130278184 | AC MOTOR CONTROL APPARATUS - A control apparatus of an AC motor improves an electric current estimation accuracy of the AC motor. The control apparatus includes an electric current estimation unit that repeatedly performs an inverted dq conversion, a dq conversion, and a correction process. Based on a d/q axis electric current estimate values of a previous cycle, the inverted dq conversion calculates an electric current estimate value of a sensor phase. The dq conversion calculates a d/q axis electric current correction values based on an electric current estimation error of the sensor phase, which is derived from the electric current estimate value and the electric current detection value detected by an electric current detector. The correction process calculates the d/q axis electric current estimate values of a current cycle by correcting the d/q axis electric current estimate values of the previous cycle by using the d/q axis electric current correction values. | 10-24-2013 |
| 20130278185 | AC MOTOR CONTROL APPARATUS - A control apparatus for an AC motor includes a current sensor and an estimation section. The current sensor detects current flowing through one phase of the motor. The estimation section repeats an estimation process. In the estimation process, d-axis and q-axis current estimation values are calculated based on the presently detected current of the one phase and a previous current estimation value of another phase of the motor, and a present current estimation value of each phase is calculated based on smoothed values of the d-axis and q-axis current estimation values. The estimation section performs the estimation process based on a phase lag element. The phase lag element is a difference between the presently detected current and a previous current estimation value of the one phase or the previously detected current. | 10-24-2013 |
| 20130278186 | AC MOTOR CONTROL APPARATUS - A control apparatus for a three-phase AC motor includes a current sensor and a current estimation section. The current sensor detects current flowing through one phase of the motor. The current estimation section repeats dq transformation and inverse dq transformation in a predetermined cycle. In the dq transformation, a d-axis current estimation value and a q-axis current estimation value in a rotating coordinate system of the AC motor are calculated based on the detected current and a previous current estimation value of another phase of the AC motor. In the inverse dq transformation, a present current estimation value of the other phase to be obtained at a time of angle advance of one period of the cycle is calculated based on smoothed values of the d-axis current estimation value and the q-axis current estimation value. | 10-24-2013 |
| 20130278187 | AC MOTOR CONTROL APPARATUS - A control apparatus includes an electric current estimation unit to improve a responsiveness of an AC motor. The electric current estimation unit performs, at predetermined intervals, a dq conversion, a correction process, and an inverted dq conversion. The dq conversion calculates d/q axis electric current estimate values based on a detection value of a sensor phase from a sensor, and on an electric current estimate values of two phases of the AC motor other than the sensor phase from a previous cycle. The correction process corrects, during the dq conversion, the d/q axis electric current estimate values in an orthogonal direction that is orthogonal to a sensor phase axis. The inverted dq conversion calculates the electric current estimate values of the two phases other than the sensor phase based on the d/q axis electric current estimate values corrected by the correction process and smoothed by a low-pass filter process. | 10-24-2013 |
| 20130278188 | AC MOTOR CONTROL APPARATUS - A control apparatus of an AC motor improves an electric current estimation accuracy of the AC motor, which includes a three phase motor with an electric current detector to detect an electric current detection value of one of the three phases (a sensor phase). The control apparatus includes an electric current estimation unit that repeatedly performs an inverted dq conversion and a dq conversion. The inverted dq conversion calculates an electric current estimate values for phases other than the sensor phase based on the d/q axis electric current estimate values of a previous cycle. The dq conversion calculates the d/q axis electric current estimate values of a current cycle in a rotation coordinate system of the AC motor based on the electric current estimate values calculated by the inverted dq conversion and the electric current detection value of the sensor phase detected by the electric current detector. | 10-24-2013 |
| 20130278189 | INVERTER CONTROL SYSTEM - A LPF extracts DC component of a current detection value of an inverter input current. A subtracting section | 10-24-2013 |
| 20130307447 | CURRENT CONTROL FOR AN ELECTRIC ACTUATOR - A controller for an electric actuator includes a reference model that generates position and speed reference signals in response to a position command signal and employs a feed forward model that accounts for dynamic loading of the electric actuator. The feed forward model receives the position and speed reference signals provided by the reference model, and in response generates feed forward signals that account for mechanical characteristics of the electric actuator. | 11-21-2013 |
| 20130307448 | MOTOR CONTROL DEVICE - An object is to provide a specific achievement means for achieving reliable failure determination in a control system in a motor control device. | 11-21-2013 |
| 20130307449 | CONTROL DEVICE - A control device for a rotating electrical machine, which is able to reduce a tracking delay of an actual output torque and actual currents with respect to a fluctuating torque command and fluctuating current commands and to reduce steady state deviations, is obtained. The control device includes a torque current computing unit; an actual current computing unit; a current feedback control unit; and a voltage control unit that controls voltages on the basis of the two-phase voltage commands. The torque command includes a fluctuation cancellation torque command for cancelling transmission torque fluctuations transmitted from the internal combustion engine, and the current feedback control unit includes a harmonic controller that calculates the two-phase voltage commands by using a characteristic of a transfer function corresponding to a periodic function of a frequency of the transmission torque fluctuations. | 11-21-2013 |
| 20130320889 | BLOWER SYSTEM AND METHOD FOR CONTROLLING THE SAME - A blower system, including a permanent magnet motor and a wind wheel. The permanent magnet motor includes a stator assembly, a rotor assembly, and a motor controller. The rotor assembly includes a salient pole rotor including a rotor core and magnets embedded in the rotor core. The motor controller includes a microprocessor, a frequency inverter, and a sensor unit. The sensor unit inputs a phase current or phase currents, a phase voltage, and a DC bus voltage into the microprocessor. The microprocessor outputs a signal to control the frequency inverter which is connected to a winding of the stator assembly. The ratio between an air gap of the motor and the thickness of the magnets ranges from 0.03 to 0.065, and the ratio between the length of a pole arc and the length of the magnets ranges from 0.8 to 1.0. | 12-05-2013 |
| 20130320890 | MOTOR CONTROLLER - Phase voltage setting means defines an actual current phase region including a current phase error range based on parameters including an individual difference of at least any one of a motor and an inverter, defines a stable operation current phase region in which a rotor position can be detected through sensorless control, and sets, as a target current, an electric current obtained by adding a predetermined phase difference corresponding to the number of revolutions detected by revolution number detecting means to an electric current set by current vector control such that the actual current phase region is within the stable operation current phase region. | 12-05-2013 |
| 20130320891 | CONTROL METHOD AND DEVICE FOR AN ELECTRIC MACHINE - A method is described for controlling an electric machine during a motor startup operation with the aid of a power electronics device, in particular for use in a motor vehicle. The power electronics device includes a plurality of controllable power switches which are connected for the purpose of supplying an electrical current to the electric machine in polyphase form. The power electronics device is controlled in such a way that the electric machine outputs a startup torque, and the control of the power electronics device for outputting the startup torque takes place in such a way that the switching position of at least two of the power switches is changed, with the result that the power switches are subjected to a more uniform load. | 12-05-2013 |
| 20130328508 | METHOD FOR CONTROLLING INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR - Disclosed is a method for controlling a permanent magnet synchronous motor to maximize use of voltages of a battery by voltage phase control within weak magnetic flux area and to achieve compensation for a torque error through a torque compensator when driving the permanent magnet synchronous motor for hybrid vehicles. In particular, the method controls a permanent magnet synchronous motor so that voltage use can be maximized in a weak magnetic flux area by using voltage near maximum voltage through voltage phase control utilizing magnetic flux-based map data receiving a torque command and motor speed/batter output voltage as inputs and torque error can be compensated using a torque compensation filter when a motor constant is changed in the weak magnetic flux by a circumstance parameter, when the permanent magnet synchronous motor mounted in a hybrid vehicle and an electric vehicle is driven. | 12-12-2013 |
| 20130328509 | METHOD FOR OPERATING MOTOR OF MOTOR-DRIVEN POWER STEERING - A method for operating a motor of a motor-driven power steering (MDPS) includes: generating, by an inverter operating unit, a two-phase operation command by projecting a Q-axis command onto a two-phase operation axis, when an error occurs in any one of three phases; converting, by the inverter operating unit, coordinates of the two-phase operation command into an actual operation axis; calculating, by the inverter operating unit, a two-phase operation voltage by performing proportional integral (PI) control on the two-phase operation command converted into the actual operation axis; and operating, by the inverter diving unit, a motor by applying the two-phase operation voltage to an inverter unit. | 12-12-2013 |
| 20130334991 | VARIABLE-FLUX MOTOR DRIVE SYSTEM - A variable-flux motor drive system including a permanent-magnet motor including a permanent magnet, an inverter to drive the permanent-magnet motor, and a magnetize device to pass a magnetizing current for controlling flux of the permanent magnet. The permanent magnet is a variable magnet whose flux density is variable depending on a magnetizing current from the inverter. The magnetize device passes a magnetizing current that is over a magnetization saturation zone of magnetic material of the variable magnet. This system improves a flux repeatability of the variable magnet and a torque accuracy. | 12-19-2013 |
| 20130334992 | CONTROL METHOD IMPLEMENTED IN A POWER CONVERTER AND INTENDED FOR IDENTIFYING PARAMETERS LINKED TO THE MAGNETIC SATURATION OF AN ELECTRIC MOTOR - A control method implemented in a power converter including an inverter connected to a synchronous electric motor including permanent magnets, the electric motor being modeled in the power converter by a mathematical model of currents in the electric motor expressing a flux current and a torque current on the basis of magnetic-saturation parameters. The control method identifies magnetic-saturation parameters during a learning procedure including applying a static voltage signal and a high-frequency voltage signal along an axis of the flux and/or an axis of the torque of the motor to cause an oscillation of the current on the axis of the flux and/or on the axis of the torque. | 12-19-2013 |
| 20140009093 | CONTROLLER FOR MULTIPLE-PHASE ROTATING MACHINE - A controller for a multiple-phase rotating machine includes power converters for supplying alternating current to winding sets of the rotating machine. A pair of each electrical power converter and a corresponding winding set forms a system. The controller further includes a failure detector for detecting a failure in each system. The failure causes a braking current in the rotating machine. The controller further includes a control section for setting a d-axis current and a q-axis current to drive the power converter in each system. When the failure detector detects the failure in any one of the systems, the control section stops the power converter in the failed system and sets the d-axis current in the normal system in such a manner that an electric current in the failed system is reduced. | 01-09-2014 |
| 20140015457 | SYSTEM AND METHOD FOR CALIBRATING OFFSET OF MOTOR RESOLVER - Provided is a system and method for calibrating an offset of a resolver in a motor of a vehicle. More specifically, a current is applied to the −d-axis of the motor, the Vq, Vd, Iq, and Id of the motor is measured and a power input to the motor is calculated by a controller, and when the input power is not within a predetermined range, the controller adjusts the offset of the resolver to a positive or negative value accordingly. | 01-16-2014 |
| 20140028224 | MOTOR CONTROL DEVICE - A motor control device includes an inverter driving an electric motor, a vector controller determining an output frequency and a command output voltage to drive the inverter, a speed controller determining a torque command value, a current command calculation unit and an inertia moment estimation unit obtaining a load torque estimate value and estimating inertia moment that is a combination of inertia moment of a motor rotor and inertia moment of a load apparatus, based on a deviation between an acceleration/deceleration torque output value obtained by subtraction of the load torque estimation from motor torque and an acceleration/deceleration torque estimate value obtained by multiplying a variation amount in the speed estimate value per unit time by an inertia moment estimate value. The speed controller is configured to be capable of adjusting a control parameter based on an inertia moment estimate value estimated by the inertia moment estimation unit. | 01-30-2014 |
| 20140035491 | CONTROL APPARATUS OF ROTATING DEVICE - In a control apparatus of a rotating device, a voltage command value setting section sets terminal command values on the basis of a command value of a control amount of the rotating device. Individual correcting sections calculate feedback operation amounts on the basis of history information of electric currents flowing in respective terminals of the rotating device and corrects the terminal voltage command values with the feedback operation amounts. A prohibiting section prohibits difference corresponding amounts, which correspond to differences of the feedback operation amounts and an average of the feedback operation amounts, from being reflected in correcting the terminal voltage command values with maintaining polarities when a determining section determines that it is a switching time from one of a power-running control and a regeneration control to the other. | 02-06-2014 |
| 20140042938 | CONTROL DEVICE FOR ELECTRIC MOTOR AND CONTROL METHOD FOR ELECTRIC MOTOR - A control device | 02-13-2014 |
| 20140062353 | ROTOR POSITION ESTIMATING DEVICE, ELECTRIC MOTOR CONTROL SYSTEM AND ROTOR POSITION ESTIMATING METHOD - A rotor position estimating device includes a voltage application unit, a current detecting unit and an estimating unit. The voltage application unit is configured to apply a d-axis voltage to an electric motor including a salient-pole rotor during a stop of the electric motor. The current detecting unit is configured to detect a q-axis current flowing through the electric motor at the time when the d-axis voltage is applied. The estimating unit is configured to estimate a rotor position during a stop of the electric motor on the basis of the q-axis current detected by the current detecting unit. The voltage application unit is configured to set a voltage application time in correspondence with peak timing at which the q-axis current reaches a peak in a transitional response characteristic of the q-axis current at the time when the d-axis voltage is applied. | 03-06-2014 |
| 20140070738 | ELECTRIC MOTOR TORQUE CONTROL - A vehicle includes one or more inverter-fed electric machines such as permanent magnet synchronous motors. In response to a torque request, a controller issues commands to an inverter calculated to cause the motor to produce the requested torque. A method of operating the inverter may determine the commands based on the ratio of rotor speed to inverter input voltage, reducing the approximation error associated with multi-dimensional lookup tables. When the speed and voltage vary while maintaining a constant ratio and constant torque request, the issued commands produce a winding current in the electrical machine with constant direct and quadrature components. | 03-13-2014 |
| 20140070739 | ELECTRIC MOTOR TEMPERATURE COMPENSATION - A vehicle includes one or more inverter-fed electric machines such as permanent magnet synchronous motors. In response to a torque request, a controller issues commands to an inverter calculated to cause the motor to produce the requested torque at the current temperature. A method adjusts the direct component of the winding current such that the requested torque is delivered efficiently. For a given rotor speed, bus voltage, and torque, the direct component increases as the temperature increases. | 03-13-2014 |
| 20140084821 | Method and Apparatus for Controlling an Electrical Machine - An observer ( | 03-27-2014 |
| 20140084822 | CONTROL DEVICE FOR ROTARY MACHINE - A storage section stores, as stored current values, currents flowing when a voltage application section applies voltage vectors to a three-phase rotary machine. A position estimation section estimates the rotor position of the rotary machine in a stopped state based on the stored current values. An adjustment section adjusts a minimum necessary application time that allows the rotary machine to be magnetically saturated by voltage vector application, to enable rotor position estimation. Further, the adjustment section uses, as an adjustment evaluation value, the magnitude |ΔY| of differential admittance obtained by dividing a summed current value calculated from the stored current values by the voltage amplitude value of the voltage vector instruction when the voltage vector based on the voltage vector instruction is applied with the application time being set at an arbitrary application time, and adjusts the application time based on |ΔY|. | 03-27-2014 |
| 20140091740 | CONTROL DEVICE FOR AC MOTOR - A control device for a three-phase alternate current motor, includes: a control phase current acquisition means; a monitor phase current acquisition means; a rotation angle acquisition means; a two-phase control current value current calculation means; a one-phase current estimated value estimation means; a voltage command value calculation means; an other phase current estimation means for calculating a monitor or a control phase current estimated value; an abnormality detection means for detecting an abnormality in a monitor phase or a control phase current sensor; and a switching means for switching between a monitoring stop mode, in which the voltage command value is calculated based on the two-phase control current value, and a monitoring mode, in which the voltage command value is calculated based on the one-phase current estimated value, and the abnormality detection means detects the abnormality, at predetermined time intervals. | 04-03-2014 |
| 20140103841 | Controlling Method of Synchronous Motor - A method is for controlling a synchronous motor includes a stator, a rotor with a position and a speed, a direct axis and a quadrant axis. The method includes: providing a position control, a speed control and a current control programs; executing either the position control program or the speed control program to produce a quadrant axis current; executing the current control program; detecting the synchronous motor to obtain a first, a second and a third phase currents, and digitizing the three phase currents; using the three phase currents and the quadrant axis current to calculate a direct axis current; converting the direct axis current and quadrant axis current to a direct axis voltage command and quadrant axis voltage command; executing a pulse width modulation for the direct axis and the quadrant axis voltage commands, to get a trigger signal for controlling the synchronous motor. | 04-17-2014 |
| 20140117893 | CONTROL APPARATUS FOR AC MOTOR - A current estimation section of a motor control apparatus carries out the following processing. When an AC motor is controlled under a current feedback control scheme (sine wave control mode or overmodulation control mode), a β-axis current iβ is calculated based on a current detection value iw_sns in a sensor phase and a current command value iv* in one other phase. When the AC motor is controlled under a torque feedback control scheme (rectangular wave control mode), the β-axis current iβ is calculated based on a differential value Δiα of an α-axis current. Then a sensor phase reference current phase θx is calculated to estimate a U-phase current. Thus it is possible to use the current feedback control scheme and the torque feedback control scheme together. | 05-01-2014 |
| 20140125261 | CONTROLLER OF AC MOTOR - A controller of an AC motor includes a d-axis voltage command section to generate a d-axis voltage command on a d axis of a d-q coordinate system. A d-axis non-interactive control section removes, from the d-axis voltage command, an interference component resulting from a current on a q axis of the system. A first current deviation arithmetic section obtains a deviation between a current command on the q axis and the current on the q axis flowing through the AC motor. A q-axis integral control section outputs an integral value of the deviation. A q-axis voltage command section generates a q-axis voltage command based on the deviation. A constant output control section outputs a correction voltage command based on the integral value. A d-axis voltage command correction section subtracts the correction voltage command from the d-axis voltage command after non-interactive control to correct the d-axis voltage command. | 05-08-2014 |
| 20140132188 | SYSTEM FOR CONTROLLING A VOLTAGE INVERTER SUPPLYING POWER TO A MULTIPHASE ELECTRICAL MOTOR OF A MOTOR VEHICLE - A system for controlling a voltage inverter, or supplying power to a multiphase electric motor of an automobile vehicle, including: a mechanism generating values of power supply voltages for each phase of the electric motor, together with an amplitude value of the power supply voltages; a phase-splicing determination mechanism; and a controller controlling the phase splicing cooperating to control transmission to the voltage inverter of duty cycles generated by determining the duty cycles, as a function of values of power supply voltages for each phase of the electric motor, and also of the amplitude value of the power supply voltages. | 05-15-2014 |
| 20140139154 | CURRENT VECTOR CONTROLLED SYNCHRONOUS RELUCTANCE MOTOR AND CONTROL METHOD THEREOF - A current vector controlled synchronous reluctance motor and control method thereof, wherein the motor has a coil on each of the teeth. The coils form a U-phase winding, a V-phase winding and a W-phase winding. The phase windings receive a balanced three-phase current vector to induce closed magnetic field lines, such that the coils induce same magnetic poles adjacent to the rotor unit. Two short magnetic routes are formed along three adjacent teeth and the rotor unit. The efficiency of the reluctance motor is high. | 05-22-2014 |
| 20140139155 | METHOD AND DEVICE FOR CONTROLLING A RELUCTANCE ELECTRIC MACHINE - In a method of controlling a reluctance polyphase electric machine, or an automobile motor, currents injected into each coil of a stator of the machine are deduced by a transformation of a pair of excitation currents and of armature current defined in a reference frame rotating with the rotor of the machine, such that: the excitation current is composed of a fundamental sinusoidal signal, to which are added successively other odd harmonics of increasing order when a torque setpoint of the machine increases, and the armature current is a signal proportional to the estimated or measured electromotive force of the machine. | 05-22-2014 |
| 20140145653 | SYSTEM AND METHOD FOR ESTIMATING THE POSITION OF A WOUND ROTOR SYNCHRONOUS MACHINE - A system for estimating a rotor position may include a synchronous machine, including at least one stator winding pair configured to create a magnetic field when an input voltage is applied and a rotor having a field winding and configured to rotate within the magnetic field created by the at least one stator winding pair. The system may include a phase detector configured to determine a phase difference between the input voltage and a field voltage induced in the field winding of the rotor. The system may also include a processor configured to receive a signal from the phase detector indicative of the phase difference between the input voltage and the field voltage, and to estimate the rotor position based on the phase difference. | 05-29-2014 |
| 20140145654 | APPARATUS AND METHOD FOR MEASURING POSITION DEVIATION OF ROTOR OF PERMANENT MAGNET SYNCHRONOUS MOTOR - An apparatus for measuring a position deviation of a rotor of a permanent magnet synchronous motor includes a control unit, a power transformation unit, a rotor position estimator and a calculation unit. The control unit receives a d-axis DC voltage signal and a q-axis AC voltage signal and receives an initial value of the rotor position and a high-frequency signal to output a three-phase command signal. The power transformation unit receives the three-phase command signal and outputs a three-phase control signal for controlling the motor. The rotor position estimator receives a three-phase current feedback signal corresponding to an operation of the motor and generates an estimation value of the rotor position. The calculation unit performs calculation to the initial value and the estimation value to generate a deviation value of the rotor position. Moreover, a method for measuring the position deviation is also disclosed herein. | 05-29-2014 |
| 20140145655 | Self-Commissioning Procedure For Inductance Estimation In An Electrical Machine - A method of estimating inductances and flux linkages of an electrical machine supplied with drive currents via current regulators. Drive current values are measured and fed back to the regulators for closed-loop control. The method includes providing one current regulator with an alternating current value either for a direct axis current reference i* | 05-29-2014 |
| 20140152204 | MAGNETIC POLE POSITION DETECTOR FOR SYNCHRONOUS MOTOR - A magnetic pole position detector includes, a voltage command unit that generates high-frequency voltage command in a dq coordinate system, a three-phase transformation unit that transforms the high-frequency voltage command in the dq coordinate system to high-frequency voltage command in a three-phase coordinate system by using an estimated magnetic pole position, a current detection unit that detects three-phase current fed from a power converter for generating drive power, a dq transformation unit that transforms the detected three-phase current to current in the dq coordinate system by using the estimated magnetic pole position, an estimated magnetic pole position calculation unit that calculates a new estimated magnetic pole position to be used in three-phase dq transformations, and a magnetic pole position confirmation unit that confirms that, when converging on a certain position, the estimated magnetic pole position is the magnetic pole position at the time when the synchronous motor is started. | 06-05-2014 |
| 20140152205 | CONTROL DEVICE OF AC MOTOR - A control device of a three-phase AC motor includes: an inverter for driving the motor; a current sensor for sensing a current; and a control means for controlling the motor by switching on/off each switching element in the inverter with feeding back dq axis current calculated values to dq axis current command values, or with feeding back a torque estimated value to a torque command value. The control means includes one first order current operation part that: expands a phase current sensed value of one phase in Fourier series as a function of an electric angle; extracts a first order component of the Fourier series; operates a first order current operated value; and integrates a calculated value based on the phase current sensed value at an integral angle for k periods of the electric angle so that Fourier coefficients are calculated. | 06-05-2014 |
| 20140152206 | CONTROL DEVICE FOR ALTERNATING CURRENT ROTATING MACHINE AND ELECTRIC POWER STEERING DEVICE EQUIPPED WITH CONTROL DEVICE FOR ALTERNATING CURRENT ROTATING MACHINE - A control device for an AC rotating machine includes a voltage command calculation means ( | 06-05-2014 |
| 20140152207 | MOTOR CONTROL DEVICE - A motor control device according to the present invention includes a motor driving unit for driving a motor, a current vector controller, a magnetic-flux weakening current command generator, and one of a target command limiter and a q-axis current command limiter. The current vector controller controls a current of the motor by separating the current into a d-axis current and a q-axis current orthogonal to each other, in accordance with a target command value from the outside. The magnetic-flux weakening current command generator generates a d-axis current command to control the amount of the d-axis current, based on one of differences, i.e. a difference between a first predetermined reference value and the absolute value of a voltage command from the current vector controller to the motor driving unit and a difference between a second predetermined reference value and a q-axis component of the voltage command. The target command limiter sets a limit value of the target command value from the outside, based on an excessive amount of the d-axis current command over a negative upper limit. | 06-05-2014 |
| 20140159621 | METHOD AND SYSTEM FOR DETECTING FAULT OF PARALLEL COIL TYPE PERMANENT MAGNET MOTOR - Disclosed are a method and system for detecting a fault of a parallel coil type permanent magnet motor. This method includes driving a parallel coil type motor on the basis of a pre-defined current reference value, detecting a phase current vector of the motor, and calculating a current compensation value for removing a negative sequence component of the motor on the basis of the phase current vector. | 06-12-2014 |
| 20140167659 | MOTOR CONTROL DEVICE AND MOTOR CONTROL METHOD - In an αβ coordinate system, vectors of currents flowing in three-phase AC motor are set in directions fixed relative to a zero vector current according to a voltage applied in six non-zero vector switching modes of an inverter. A current vector closest to a command current value is specified from those current vectors. Then, only a non-zero vector current when operating the inverter in the non-zero vector switching mode corresponding to the specified current vector is calculated. | 06-19-2014 |
| 20140176028 | MOTOR CONTROL DEVICE AND WORK MACHINE USING THE SAME - The controller estimates torque output by the motor and controls the current supplied to the motor in such a manner that a torque estimate of the motor obtained by the estimation corresponds to the torque command value. A torque estimation calculator | 06-26-2014 |
| 20140184114 | CONTROL APPARATUS FOR AC MOTOR - An apparatus for controlling an AC motor driven by an inverter includes a two-phase calculator for calculating a two-phase control current value based on a first-phase current, a second-phase current, and a rotation angle of the motor, a one-phase calculator for calculating a one-phase control current value based on the first-phase current and the rotation angle, a determinator for determining whether a sudden change occurs based on a fluctuation in a rotation speed of the motor, a switch for selecting the one-phase control current value as a fixed value when no sudden change occurs and selecting the two-phase control current value as the fixed value when the sudden change occurs, and a voltage command value calculator for calculating a voltage command value related to a voltage applied to the inverter based on the current fixed value and a drive command value related to driving of the AC motor. | 07-03-2014 |
| 20140203742 | MOTOR DRIVING DEVICE AND VACUUM PUMP - A motor driving device comprises an inverter, a first arithmetic section, a driving command generating section and a PWM signal generating section. The first arithmetic section calculates a rotational speed and a magnetic pole electrical angle of a motor rotor based on information about a motor phase voltage and information about a motor phase current. The first arithmetic section includes a counter electromotive voltage arithmetic section, a converting section, a second arithmetic section, a third arithmetic section, and a fourth arithmetic section. The first arithmetic section outputs a sum of the magnetic pole phase error and the integrated value as the magnetic pole electrical angle. | 07-24-2014 |
| 20140210385 | MOTOR DRIVING DEVICE AND VACUUM PUMP - A motor driving device comprises a first arithmetic section calculating a rotational speed and a magnetic pole electrical angle of a motor rotor, a current command setting section setting a d-axis current command and a q-axis current command in a rotating coordinate dq system based on a difference between the rotational speed and a target rotational speed, a driving command generating section generating a sinusoidal wave driving command based on the d-axis current command, the q-axis current command, the rotational speed and the magnetic pole electrical angle and a PWM signal generating section. When the rotational speed has a positive value indicating a positive rotational state, the current command setting section sets the q-axis current command of acceleration driving, and when the rotational speed has a negative value indicating a reverse rotational state, the current command setting section sets the q-axis current command of deceleration driving. | 07-31-2014 |
| 20140210386 | STATOR FLUX MAGNITUDE AND DIRECTION CONTROL STRATEGIES FOR PERMANENT MAGNET SYNCHRONOUS MOTORS - The present disclosure relates to a motor control circuit and related method that includes a transform component configured to receive current values associated with a motor being driven by the motor control circuit, and output polar coordinate values representing a magnitude component and a direction component of a current space vector. The motor control circuit further includes a control component configured to receive the magnitude component and the direction component of the current space vector, and generate motor control signals for driving the motor. | 07-31-2014 |
| 20140210387 | OPTIMIZED FIELD ORIENTED CONTROL STRATEGIES FOR PERMANENT MAGNET SYNCHRONOUS MOTORS - A motor control system and associated method includes a transform component configured to receive current values associated with a motor being driven by the motor control system, and output rotating coordinate system values representing a flux generating component and a torque generating component of a current space vector. The motor control system and method further includes a control component configured to receive the flux generating component and the torque generating component of the current space vector, and generate motor control signals for driving the motor by performing a Cartesian to polar transform to obtain values associated with a rotating coordinate system followed by an angle addition to convert the rotating coordinate system values to values of a stationary coordinate system. | 07-31-2014 |
| 20140232304 | ROTARY ELECTRICAL MACHINE CONTROL DEVICE - Regenerated power fed from a rotary electric machine is immediately reduced where connection between an electric machine and a DC power source is blocked. An inverter control section controls the inverter by controlling an armature current in a two-axis orthogonal coordinate system that rotates in synchronization with the rotary electric machine, the armature current being a vector obtained by synthesizing a field current and a drive current extending along respective axes of the orthogonal coordinate system. If it is determined that connection between the DC power source section and the inverter is in a blocked state, the inverter control section executes zero-torque control in which the inverter is controlled such that torque regenerated by the rotary electric machine becomes zero, and executes high-loss control in which the field current is varied so as to increase the armature current while maintaining a torque command provided in the zero-torque control. | 08-21-2014 |
| 20140232306 | MAGNET FLUX AMOUNT ESTIMATION DEVICE, ABNORMAL DEMAGNETIZE DETERMINATION DEVICE, SYNCHRONOUS MOTOR DRIVING DEVICE, AND ELECTRIC MOTOR CAR - According to one embodiment, a magnet flux amount estimation device includes a magnetic pole position detector configured to detect a magnetic pole position of a permanent magnet synchronous motor including a permanent magnet within a rotor; an inductance-equivalent value determination module configured to determine an inductance-equivalent value of a d-axis corresponding to a determined magnetic pole direction; and a magnet flux amount estimator configured to calculate an estimation value of a magnet flux amount of the permanent magnet, based on the inductance-equivalent value. | 08-21-2014 |
| 20140232307 | VECTOR CONTROL DEVICE FOR ELECTRIC MOTOR, ELECTRIC MOTOR, VEHICLE DRIVE SYSTEM, AND VECTOR CONTROL METHOD FOR ELECTRIC MOTOR - A vector control device includes a vector control unit computing an output voltage output from the electric power converter according to vector control based on torque command and flux command and generating a PWM signal for controlling the electric power converter based on the output voltage, a first flux-command generation unit generating a flux command for asynchronous PWM mode, and a second flux-command generation unit generating a flux command for synchronous PWM mode. When an output frequency of the electric power converter is lower than a predetermined value, a flux command generated by the first flux-command generation unit is input to the vector control unit, and when the output frequency of the electric power converter is equal to or higher than a predetermined value, a flux command generated by the second flux-command generation unit is input to the vector control unit. | 08-21-2014 |
| 20140232308 | INVERTER APPARATUS - An object of the present invention is to achieve stable inverter control by means of current detection using one current sensor in all of periods in which overmodulation control is performed. An inverter controller includes a γ-axis current calculation section that holds, in advance, a γ-axis current arithmetic expression including a direct current as a parameter, and calculates a γ-axis current using a direct current detected by a current sensor for the γ-axis current arithmetic expression. | 08-21-2014 |
| 20140232309 | POWER CONVERTER - In a power converter, vibration and noise of a motor due to pulsation of a direct current link voltage are reduced. An inverter circuit is provided, which is configured to convert a direct current link voltage having a pulsating component to an alternating current to output the alternating current to a permanent magnet synchronous motor. A controller is provided, which is configured to control the inverter circuit by vector control and which, in a control state in which fundamental voltage vectors do not include a zero vector (voltage vector for which a motor terminal voltage is zero), performs such control that the phase of a resultant voltage vector of a d-axis voltage vector and a q-axis voltage vector of the permanent magnet synchronous motor varies depending on pulsation. | 08-21-2014 |
| 20140246997 | ROTARY ELECTRIC MACHINE CONTROL APPARATUS - A control unit of a rotary electric machine control apparatus includes a rotation position calculation section, which calculates a sensor angle by correcting a detection signal of a rotation position sensor based on correction value information specific to each sensor, and a correction value abnormality check section, which checks whether the correction value information is normal. When the correction value information is abnormal, the rotation angle calculation section corrects the detection signal of the rotation position sensor by using default value information in place of the correction value information. Each default value is limited to be different from the correction value within a predetermined range. A current command value calculation section sets a d-axis current command value to zero and fixes a current command phase to 90[°]. The current command phase is changed to be most remote from 0[°] and 180[°] thereby ensuring a tolerable range. | 09-04-2014 |
| 20140253000 | METHOD OF CURRENT REFERENCE GENERATION FOR A MOTOR - A motor control system for determining a reference d-axis current is provided, and includes a motor, a DC power source and DC input lines, and a current command controller. The DC power source generates a bridge voltage across the DC input lines. The current command controller is in communication with the motor and the DC input lines. The current command controller is configured to monitor the bridge voltage and a torque reference command. The current command controller is configured to determine a peak current based on the torque reference command. The current command controller is configured to determine a current angle based on the peak current. The current command controller is configured to determine the reference d-axis current based on the current angle. | 09-11-2014 |
| 20140253001 | MOTOR ROTATIONAL POSITION DETECTING DEVICE, WASHING MACHINE AND MOTOR ROTATIONAL POSITION DETECTING METHOD - A motor rotational position detecting device includes a control current command output unit configured to generate and supply a torque current command and an excitation current command according to a control command for a permanent magnet motor having magnetic saliency, when receiving a control command. The control current command output unit includes a command value storage unit configured to store a value of the excitation current command supplied so that a rotational position error amount obtained by a rotational position detection unit is rendered zero when the control current command output unit supplies any torque current command value while the motor maintains any rotational position. When generating the torque current command in response to the control command, the control current command output unit is configured to read from the command value storage unit an excitation current command corresponding to the torque current command and to set the read command. | 09-11-2014 |
| 20140265951 | MOTOR CONTROL SYSTEM FOR DETERMINING A REFERENCE D-AXIS CURRENT AND A Q-AXIS CURRENT - A motor control system for determining a reference d-axis current and a reference q-axis current is provided. The motor control system includes a motor, a DC power source and DC input lines, and a current command controller. The DC power source generates a bridge voltage across the DC input lines. The current command controller is configured to monitor the bridge voltage and a torque reference command. The current command controller is configured to calculate the reference q-axis current based on a torque reference command. The current command controller is configured to calculate the reference d-axis current based on a magnitude of the reference q-axis current. | 09-18-2014 |
| 20140265952 | Automated Motor Control - Input-output linearization (IOL) and extended state observer (ESO) techniques are applied to a Field Oriented Control (FOC) for Permanent Magnet Synchronous Motors (PMSM). In one such approach, at least one gain value is determined based at least in part on a given bandwidth value. Operating parameters for the motor are determined based on the at least one gain value and information from a current sensor regarding motor current. Control signals used to the control the motor are determined based on the determined operating parameters. Accordingly, automated control can be effected through setting a bandwidth value through the implementation of IOL and ESO techniques. | 09-18-2014 |
| 20140265953 | GENERATION OF A CURRENT REFERENCE TO CONTROL A BRUSHLESS MOTOR - A current reference generator to control a brushless motor in a motor control system is provided. The current reference generator includes a locate peak torque module that determines a maximum possible torque and a direct axis current that corresponds to the maximum possible torque based on motor parameters, a maximum voltage, a motor velocity of the brushless motor, and a sign of a torque command. A limit torque command module limits the torque command to the maximum possible torque. A locate minimum current module determines a value of the direct axis current that results in a minimum motor current. A solve current reference module generates a reference vector that satisfies the torque command as limited by the direct axis current that corresponds to the maximum possible torque and the direct axis current that results in the minimum motor current. | 09-18-2014 |
| 20140265954 | ROTATING ELECTRIC MACHINE CONTROL DEVICE AND ELECTRIC POWER STEERING APPARATUS - In a rotating electric machine control device, a voltage command value calculation section calculates a voltage command value based on a current command value and a motor current. An inverter power estimation section estimates an inverter power based on the motor current. A power supply current estimation section estimates a power supply current based on the inverter power and a power supply voltage. A limit gain determination section determines a limit gain based on the power supply current and a target power supply current. A limited voltage command value calculation section calculates a limited voltage command value based on the voltage command value and the limit gain. A current limitation section is capable of limiting the power supply current by outputting a command value corresponding to the limited voltage command value to an inverter portion. | 09-18-2014 |
| 20140285124 | CONTROL METHOD AND DEVICE THEREFOR - In one embodiment, a method of forming a circuit to control an electrical machine may include, configuring the circuit to obtain voltage and current information of the voltage over and current in one or more stator coils; configuring the circuit to determine a stator current vector and a stator voltage vector; configuring the circuit to determine an amplitude and phase of a fundamental vector of the stator voltage vector and stator current vector; and configuring the circuit to determine a fundamental vector of a back-EMF. | 09-25-2014 |
| 20140285125 | MOTOR CONTROL DEVICE AND MOTOR CONTROL METHOD - This motor control device generates a voltage command value from a current command value, performs feedback control by means of a detected current flowing through a motor, and is provided with: a speed control unit that performs speed control of the motor; a voltage measurement unit that measures a voltage command value that is on the basis of the output of the speed control unit when the motor is rotating at a set speed; and a correction value calculation unit that calculates a correction value for the rotational position of the motor on the basis of the measured voltage command value. | 09-25-2014 |
| 20140292237 | MOTOR CONTROL APPARATUS AND MAGNETIC-POLE POSITION ESTIMATING METHOD - A motor control apparatus according to an embodiment includes a power conversion unit and a control unit. The power conversion unit supplies power to a motor having salient pole characteristic. The control unit performs proportional-integral control on the deviation between a current reference and a current flowing into the motor to generate a voltage reference, and controls the power conversion unit on the basis of the voltage reference. The control unit estimates the magnetic-pole position of a rotor of the motor on the basis of a high-frequency current flowing into the motor by controlling the power conversion unit, and corrects the estimated magnetic-pole position on the basis of an integrated value of the proportional-integral control. | 10-02-2014 |
| 20140292238 | Power Conversion Device - A power conversion device includes a switching circuit with multiple series circuits having upper arm switching elements connected in series with lower arm switching elements, receives DC power to generate AC power for a permanent magnet motor; a control circuit that calculates a state of the switching elements based on input information for each control cycle, and generates a control signal for controlling switching elements according; and a driver circuit that generates a drive signal that renders the switching elements conductive or non-conductive on the basis of the control signal from the control circuit. The control circuit predicts a locus of a d-axial magnetic flux and a locus of a q-axial magnetic flux, and calculates the state of the switching elements so that the d-axial magnetic flux falls within a given d-axial magnetic flux fluctuation range, and the q-axial magnetic flux falls within a given q-axial magnetic flux fluctuation range. | 10-02-2014 |
| 20140292239 | MOTOR CONTROL DEVICE AND MOTOR CONTROL METHOD - This motor control device generates a voltage command value from a current command value and performs feedback control by means of a detected current flowing through a motor. The motor control device is provided with: a correction control unit that, when the motor is being rotated at a set speed, sets a d-axis current command value and a q-axis current command value to each be zero; a current control unit that generates the integrated value of the deviation between the current command value and the detected current; and an integrated value measurement unit that measures the generated integrated value. The correction control unit adjusts the correction value for the rotational position of the motor by adjusting in a manner so that the measured integrated value becomes a value within a pre-determined range. | 10-02-2014 |
| 20140306626 | MOTOR DRIVING DEVICE AND BRUSHLESS MOTOR - A motor driving device of the present invention is a motor driving device that incorporates so-called vector control of controlling a current applied to a motor winding in accordance with the position of a rotor. The motor driving device receives the input of a duty command value from a host controller via a command input port, for example. The motor driving device obtains a current command or a speed command as a command value such that the input duty command value is equal to the duty of a drive pulse output from an inverter. Then, the motor driving device performs vector control based on the obtained command value. | 10-16-2014 |
| 20140312812 | ELECTRIC MOTOR CONTROL DEVICE - An electric motor control device includes a current vector controller that follows a target command value for controlling an electric current of the motor by separating the current into a d-axis current and q-axis current orthogonal to each other. The motor control device further includes a driver for driving the motor, a phase-angle generator a phase-angle command generator for generating a phase-angle command β* based on difference Δv* between an absolute value |v*| of a voltage command supplied from the current vector controller to the driver and a given reference value V | 10-23-2014 |
| 20140327379 | POSITION SENSORLESS DRIVE SYSTEM AND METHOD FOR PERMANENT MAGNET MOTORS - A position sensorless drive systems for a permanent magnet motors are disclosed. An embodiment includes a square wave voltage source connectable to an input of a permanent magnet motor. At least one current sensor is connectable to the motor, wherein the current sensor is configured to sense the current in at least one power line to the motor in response to the square wave input to the motor. The position of the rotor relative to the stator may be determined based on the current resulting from the square wave voltage. | 11-06-2014 |
| 20140333240 | SYNCHRONOUS MACHINE CONTROLLER - A synchronous machine controller includes a position detecting unit that detects a position of a rotor, a current detecting unit that detects an armature current, a current command generating unit that generates first and second current commands, a voltage command generating unit that generates a voltage command on the basis of the current commands, the position of the rotor, and the armature current, a power converting unit that outputs a voltage to the synchronous machine on the basis of the voltage command, a magnetic flux estimating unit that estimates an armature interlinkage flux on the basis of a rotational velocity calculated from a variation of the position of the rotor, the voltage command, and the armature current, and a magnet state estimating unit that estimates a magnetic flux or a temperature of the permanent magnet from the position of the rotor, the armature current, and the armature interlinkage flux. | 11-13-2014 |
| 20140333241 | OPTIMIZED CONTROL FOR SYNCHRONOUS MOTORS - Representative implementations of devices and techniques provide optimized control of a three-phase AC motor. A field oriented control (FOC) arrangement uses optimization components and techniques to improve power efficiency of the motor, with fast control response over a full range of motor speeds. | 11-13-2014 |
| 20140340007 | ROTARY ELECTRIC MACHINE CONTROL SYSTEM AND ROTARY ELECTRIC MACHINE CONTROL METHOD - A rotary electric machine control system includes a rotary electric machine (second motor generator), a number-of-revolutions sensor that measures the number of revolutions per predetermined time period of the rotary electric machine, and a controller. The controller has a threshold changing unit for changing a control switching phase that is a control switching threshold to be used for switching the control mode of the rotary electric machine, according to a measurement result of the number of revolutions. | 11-20-2014 |
| 20140346983 | MOTOR CONTROL DEVICE AND MOTOR CONTROL METHOD - This motor control device generates a voltage command value from a current command value and performs feedback control by means of a detected current flowing through a motor. The motor control device is provided with: a speed control unit that causes the motor to rotate at a set speed, and performs speed control of the motor on the basis of a speed command value that causes the flow of a d-axis current that is a set amount of current; a current measurement unit that measures a current command value that is on the basis of the output of the speed control unit when the motor is rotated at the set speed and the set amount of d-axis current is flowing; and a correction value calculation unit that calculates a correction value for the rotational position of the motor on the basis of the measured current command value. | 11-27-2014 |
| 20140346984 | MAGNETIC POLE POSITION ESTIMATING APPARATUS FOR ELECTRIC MOTOR, CONTROLLING APPARATUS FOR ELECTRIC MOTOR, AND MAGNETIC POLE POSITION ESTIMATING METHOD FOR ELECTRIC MOTOR - A controlling apparatus for an electric motor according to an embodiment includes a superposed component generator, an inverter, a current detector, and a magnetic pole position estimator. The superposed component generator generates, at a predetermined cycle, a superposed voltage reference of which vector is shifted by 90 degrees with respect to that of a superposed voltage reference previously generated, in a coordinate system that is set to a stator of the electric motor. The inverter outputs a driving voltage that is based on a driving voltage reference superposed with the superposed voltage reference to the electric motor. The current detector detects currents flowing into respective phases of the electric motor, and outputs the detected currents. The magnetic pole position estimator detects the magnetic pole position of the electric motor based on an amount of change in the detected currents at the predetermined cycle. | 11-27-2014 |
| 20140361715 | CONTROL DEVICE, DRIVING DEVICE, AND IMAGE FORMING APPARATUS - A control device includes a motor driving unit that supplies electric power to a motor according to a magnetic-pole-phase signal output from the motor; and a rotational-position detecting unit that converts the magnetic-pole-phase signal into a rotational-position detection signal and outputs the rotational-position detection signal. The rotational-position detection signal indicates a rotation amount and a rotation direction of an output shaft of the motor and has a higher resolution than the magnetic-pole-phase signal. | 12-11-2014 |
| 20140368135 | CONTROL DEVICE FOR ALTERNATING CURRENT ROTARY MACHINE - A control device for AC rotary machine includes a current vector detection section ( | 12-18-2014 |
| 20140375233 | PERMANENT MAGNET MOTOR CONTROL - A three-phase permanent magnet motor is controlled by generating two-phase control signals. A rotation speed value is generated representing a rotation speed of the permanent magnet motor based on a q-current reference value and a q-current feedback value, the q-current reference value and the q-current feedback value corresponding to a q-phase winding. A d-phase voltage change value is generated based on a d-current reference value and a d-current feedback value, the d-current reference value and the d-current feedback value corresponding to the d-phase winding. A first d-phase voltage value is generated based on the rotation speed value, the d-phase voltage change value, the d-current reference value and the q-current reference value. A first q-phase voltage value is generated based on the rotation speed value, the q-current reference value and the d-current reference value. | 12-25-2014 |
| 20140375234 | METHODS AND APPARATUSES FOR COMPENSATING FOR FRICTION TORQUES OF PERMANENT MAGNET SYNCHRONOUS MOTORS - A method of compensating for a friction torque of a permanent magnet synchronous motor may include: receiving input of a motor current and a rotor speed of the permanent magnet synchronous motor; estimating a motor torque based on the input motor current; acquiring a first friction torque corresponding to the input rotor speed and the estimated motor torque by using a lookup table of friction torques; compensating for a second friction torque of the permanent magnet synchronous motor based on the first friction torque, wherein the compensating is in response to a first torque command input to control driving of the permanent magnet synchronous motor and outputs a second torque command that compensates for the second friction torque; and/or controlling the driving of the permanent magnet synchronous motor based on the second torque command. | 12-25-2014 |
| 20140375235 | PERMANENT MAGNET MOTOR CONTROLLER - An object is to provide a permanent magnet motor controller capable of suppressing the rotary bending vibration that occurs in the permanent magnet motor effectively with simple configuration. A permanent magnet motor controller uses the dq coordinate conversion. A dq target current setting part adds the current component (i* | 12-25-2014 |
| 20150015169 | ONBOARD MOTOR CONTROLLER - There is provided an onboard motor controller that starts a failsafe process in short time at a vehicle collision. A control circuit in the motor controller acquires an acceleration detected by an acceleration sensor. When the acceleration is equal to or higher than a prescribed value, the control circuit determines that a collision of the vehicle has occurred, and executes a switching process of a control mode of a motor. The control circuit immediately switches the control mode of a motor from voltage phase control to current vector control when the collision is detected. The control circuit reads current values from current detectors. When an overcurrent is detected, the control circuit executes a failsafe process to turn off the MOSFETs of an inverter. The control circuit stops a supply of electricity to the inverter by turning off a power supply relay, thereby stopping the rotation of the motor. | 01-15-2015 |
| 20150022126 | METHOD AND APPARATUS FOR MONITORING A PERMANENT MAGNET ELECTRIC MACHINE - A controller-implemented method for monitoring a permanent magnet electric machine includes determining a threshold direct-axis (d-axis) current corresponding to inception of irreversible demagnetization of the permanent magnet based upon material properties of a permanent magnet mounted in a rotor of the PM electric machine and a temperature of the permanent magnet. A d-axis current associated with controlling the PM electric machine is determined, and a state of health of the PM electric machine is determined based upon the threshold d-axis current and the monitored d-axis current. | 01-22-2015 |
| 20150022127 | CURRENT CONTROL DEVICE OF SYNCHRONOUS MOTOR - A current control device of a synchronous motor comprises a provisional d-phase current command calculation unit; a voltage amplitude calculation unit calculating a magnitude of a voltage command vector in a previous sampling period; a voltage ratio calculation unit determining a voltage ratio between the magnitude of the voltage command vector and a maximum output voltage of an amplifier; a target d-phase current calculation unit obtaining a d-phase current command in the previous sampling period, and calculating a target d-phase current command from the voltage ratio and the d-phase current command; a correction value calculation unit determining a correction value by passing a difference between the provisional d-phase current command and the target d-phase current command through a low-pass filter; and an adder adding the correction value to the d-phase current command in the present sampling period to calculate a new d-phase current command. | 01-22-2015 |
| 20150035461 | ELECTRIC MOTOR CONTROL DEVICE AND ELECTRIC MOTOR CONTROL METHOD - An electric motor control device that performs a voltage phase control includes a voltage generator configured to calculate a d-q axis voltage command value, a stabilization filter having first to fourth filters determined based on a transfer characteristic from an applied voltage to an output electric current and configured to remove resonance characteristics in the d-q axis electric current, and a voltage application unit configured to apply an AC voltage to the electric motor based on the final d-q-axis voltage command value. The stabilization filter is configured to generate the final d-axis voltage command value based on a result obtained by using the first and second filters for each of the d-axis and the q-axis voltage command values and generate the final q-axis voltage command value based on a result obtained by using the third and fourth filters for each of the d-axis and the q-axis voltage command values. | 02-05-2015 |
| 20150042249 | ESTIMATING METHOD FOR A ROTOR POSITION OF A MOTOR AND ESTIMATING DEVICE FOR THE SAME - An estimating method for a rotor position of a motor and an estimating device for the same are disclosed herein. The estimating method includes injecting a first high frequency signal to the motor at a first estimating angle, generating a first sensing signal of the motor in a period when the first high frequency signal is injected to the motor, injecting a second high frequency signal to the motor at a second estimating angle, generating a second sensing signal of the motor in a period when the second high frequency signal is injected to the motor, determining a quadrant of an operating angle according to the first sensing signal and the second sensing signal, and acquiring the rotor position according to the first sensing signal, the second sensing signal, and the quadrant of the operating angle. | 02-12-2015 |
| 20150048765 | APPARATUS OF CONTROLLING VEHICLE PROVIDED WITH MOTOR AND CONTROL METHOD THEREOF - An apparatus for controlling a vehicle provided with a motor includes a current command generator that determines first and second axes currents according to driving conditions, and a current controller that generates first and second axes voltages by using the first and second axes currents and feedback currents. An axis converter converts the first and second axes voltages into 3-phase voltages, 3-phase feedback currents into first and second axes feedback currents, and transmits the same to the current controller. A pulse width modulation (PWM) generator receives the 3-phase voltages and generates corresponding 3-phase signals, and a PWM inverter generates 3-phase currents and transmits the same to the axis converter. A motor is driven by the 3-phase currents. A resolver detects a phase of the motor and transmits the same to the current command generator and the axis converter. A resolver offset determining unit calculates a resolver offset value. | 02-19-2015 |
| 20150048766 | SYNCHRONOUS MOTOR CONTROL APPARATUS - A control apparatus includes, a first calculating unit which calculates first d-phase and q-phase current limit candidate values, a second calculating unit which calculates second d-phase and q-phase current limit candidate values, a q-phase unit which, when the absolute value of the first d-phase current limit candidate value is smaller than that of the second d-phase current limit candidate value, sets the first q-phase current limit candidate value as a q-phase current limit value, but otherwise sets the second q-phase current limit candidate value as the q-phase current limit value, and a d-phase unit which, when the absolute value of the first d-phase current limit candidate value is smaller than that of the second d-phase current limit candidate value, sets the first d-phase current limit candidate value as a d-phase current limit value, but otherwise sets the second d-phase current limit candidate value as the d-phase current limit value. | 02-19-2015 |
| 20150054431 | CONTROL DEVICE OF AC MOTOR - A control device of a three-phase AC motor includes: an inverter that drives the AC motor; a current sensor that senses a current flowing in a sensor phase of the AC motor as a sensor phase current; and a controller that switches on and off a switching element of the inverter to control a current flowing through the AC motor. The controller includes: a current estimation device that estimates d-axis and q-axis current estimated values based on the sensor phase current and an electric angle of the AC motor; and a zero-crossing interpolation device that interpolates a command value relating to a voltage of the AC motor when the sensor phase current is in a zero cross range, which includes a zero point. When the sensor phase current is in the zero cross range, the zero-crossing interpolation device interpolates the command value with a continuous variable value. | 02-26-2015 |
| 20150054432 | CONTROL DEVICE OF AC MOTOR - A control device of a three-phase AC motor includes: an inverter for driving the motor; a current sensor for sensing a sensor phase current of the motor; and a controller for controlling the motor. The controller includes: a current estimation device for estimating d-axis and q-axis current estimated values based on the sensor phase current and an electric angle of the motor; and a zero-crossing interpolation device for interpolating the d-axis and q-axis current estimated values by fixing the d-axis and q-axis current estimated values when the sensor phase current is in a zero cross range, which includes a zero point, so that the sensor phase current crosses the zero point, and for outputting interpolated d-axis and q-axis current estimated values as fixed d-axis and q-axis values, which are used for a feedback control relating to current flowing through the motor. | 02-26-2015 |
| 20150054433 | SYSTEM AND METHOD FOR CONTROLLING AN ELECTRIC MOTOR - A method for controlling an electric motor includes receiving a first control command that is indicative of a desired motor control. A current operating condition for the motor is determined. It is then determined whether the first control command meets at least one predetermined criterion at the current operating condition. A second control command that is different from the first control command is generated when the first control command meets the at least one predetermined criterion. Generating the second control command includes determining a current value of a motor parameter, changing the parameter value, and using the changed parameter value to generate the second control command. The second control command is then used to control the motor. | 02-26-2015 |
| 20150077025 | POWER CONVERSION APPARATUS AND ELECTRIC POWER STEERING APPARATUS HAVING THE SAME - A power conversion apparatus includes: an inverter unit having high and low potential-side switching elements corresponding to each phase of a winding of a rotating electrical machine; a current detecting unit; and a control unit controlling the switching elements based on a PWM reference signal and a duty instruction value. The control unit includes: a phase current computing device; and a voltage instruction value computing device. The control unit computes an active voltage vector interval in first and second half periods of one or multiple cycles of the PWM reference signal to be a predetermined period or longer, and computes first and second half duty instruction values to set first and second voltage vector intervals equal to or longer than minimum time to be in the first or second half period. | 03-19-2015 |
| 20150084555 | MOTOR CONTROL APPARATUS AND MOTOR CONTROL METHOD - A motor control apparatus includes a calculator, a determinator, and a selector. The calculator calculates a zero vector current predicted to flow through a three-phase AC motor when an inverter operates in a first mode for applying no voltage to the motor. The determinator determines whether a difference between the zero vector current and a command current on a αβ stationary coordinate system falls within an allowable range. The selector selects the first mode as a switching mode of the inverter when the difference falls within the allowable range, and selects a second mode as the switching mode of the inverter upon determination that the difference falls outside the allowable range. The second mode corresponds to a non-zero current vector closest to the command current among six non-zero current vectors defined in fixed directions with respect to the zero vector current on the αβ stationary coordinate system. | 03-26-2015 |
| 20150097500 | STATOR RESISTANCE ESTIMATION FOR ELECTRIC MOTORS - A method of controlling an electric motor (motor) includes providing a processor having an associated memory storing a stator resistance (Rs) estimation (RSE) algorithm that is programmed to implement the RSE algorithm to execute steps including injecting a current waveform at an arbitrary frame of reference into the stator using a field-oriented-control (FOC) motor controller including an Id controller and an Iq controller, and measuring current and voltage values from the motor responsive to the injecting. The measured current and voltage values are then transformed into transformed current and voltage values in a d/q coordinate system. The transformed current and voltage values are low pass filtered to generate filtered d/q current and voltage values, and a value for Rs is estimated from the filtered d/q current and voltage values. The arbitrary frame of reference can be a time-varying frame of reference. | 04-09-2015 |
| 20150102753 | METHOD AND SYSTEM FOR CONTROLLING MOTOR OF ENVIRONMENTALLY-FRIENDLY VEHICLE - A method and system for controlling a vehicle motor are provided. The system includes an inverter that controls the motor to receive a torque command from an external system and output a torque based on the torque command. Additionally, a current command is generated based on the torque command and a operation condition of the motor. A voltage command is generated to be applied to the motor based on the current command and the operation condition of the motor. A pulse width modulation (PWM) command is generated based on the voltage command and the operation condition of the motor. The PWM command is converted to a voltage in a PWM form based on the motor operation condition and is applied to the motor. Then, an unwanted torque output of the motor generated based on a nonlinear characteristic of the motor is added and subtracted to and from the torque command. | 04-16-2015 |
| 20150115850 | VARIABLE TORQUE ANGLE FOR ELECTRIC MOTOR - A method for controlling an electric motor (such as a synchronous reluctance electric motor) is suggested, in which the torque angle in the d-q-reference frame is at least in part and/or at least at times varied depending on at least one working condition of the electric motor. | 04-30-2015 |
| 20150123577 | CONTROL APPARATUS FOR AC MOTOR - A control apparatus controls an AC motor by detecting current passing through one phase. The apparatus includes an upper controller which includes a torque command calculation section, and a torque monitoring section monitoring torque to determine whether the torque is within a range, and a lower controller which controls current supply to an inverter based on a torque command value to control the motor, and which acquires information on a current-supply state and a rotation state of the motor and transmits information on a control state to the upper controller. At least one of the controllers estimates a current estimate value of an estimated phase or a d-q axis current estimate value based on a current detection value of the one phase and an electrical angle, and calculates information for monitoring torque based on the current estimate value. The torque monitoring section monitors the torque based on the information. | 05-07-2015 |
| 20150130376 | METHOD OF FIELD WEAKENING CONTROL OF PERMANENT MAGNET MOTOR DRIVERS - A method for field weakening control of a three phase permanent magnet AC motor in a VFD drive. The VFD drive calculates the three phase voltages to be supplied to the AC motor via a three phase inverter using feedback and feed-forward calculations of quadrature and direct demand currents. | 05-14-2015 |
| 20150145445 | SYSTEM FOR CONTROLLING MOTOR OF HYBRID ELECTRIC VEHICLE - A system for controlling a motor of a hybrid vehicle determines a current of a first axis and a current of a second axis according to a driving condition, converts the currents of the first and second axes into a 3-phase AC current, and drives the motor by applying the 3-phase AC current to the motor, and includes: a revised temperature calculation module that calculates a revised temperature in order to compensate a torque error according to counter electromotive force dispersion of the motor; and a current determination module that determines the currents of the first and second axes by substituting the corrected temperature to a current map for each temperature and by using a demand torque at a present driving condition, a present speed of the motor, and a maximum counter magnetic flux of the motor. | 05-28-2015 |
| 20150295530 | APPARATUS FOR DRIVING INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR AND METHOD OF CONTROLLING THE APPARATUS - There is provided a driving apparatus of an interior permanent magnet synchronous motor (IPMSM) including a current command generator outputting a current command on a synchronous reference frame based on a command torque, wherein the current command generator generates the current command based on a variation in magnetic flux with respect to a rotor of the IPMSM. | 10-15-2015 |
| 20150311835 | MOTOR DRIVING SYSTEM - The disclosed invention provides a synchronous motor driving system that reduces vibration attributed to a temporal second-order component of radial electromagnetic force in a three-phase synchronous motor and controls a d-axis current and a q-axis current to reduce noise that is produced as a result of vibration resonating with a structure. A motor driving system of the present invention causes a predefined negative d-axis current to flow into a motor in which a q-axis current is less than or equal to a predefined current value and d-axis inductance and q-axis inductance match substantially. The motor driving system causes a predefined negative d-axis current to flow into a motor in which d-axis inductance and q-axis inductance differ and causes the negative d-axis current to increase with an increase in the q-axis current. | 10-29-2015 |
| 20150311844 | MOTOR CONTROLLER FOR POSITION SENSORLESS DRIVES - A system includes a permanent magnet motor having a rotor and a stator. The rotor and the stator have a configuration that causes the motor to generate a back-electromagnetic force (EMF) waveform that is substantially sinusoidal. The system also includes a motor controller having a sliding-mode observer configured to identify the back-EMF waveform and a position observer configured to estimate at least one characteristic of the motor using the identified back-EMF waveform. The stator may include multiple teeth projecting towards the rotor and multiple conductive windings, where each conductive winding is wound around a single tooth. The rotor may include multiple magnetic poles, where each magnetic pole has a span of about 60° or less. The sliding-mode observer may be configured to receive current measurements associated with three-phase signals and voltage commands generated by the motor controller. The position observer may include a proportional-integral (PI) regulator. | 10-29-2015 |
| 20150311845 | MOTOR DRIVE DEVICE AND ELECTRIC COMPRESSOR - A motor drive device drives a multi-phase synchronous motor in an electric compressor. The multi-phase synchronous motor includes a rotor that is provided with a permanent magnet and a stator having coils of different phases. The motor drive device includes an inverter that supplies current to the coils and a control unit that controls the inverter. The control unit executes an initial angular position calculation processing of detecting a d-axis and a q-axis as an initial angular position of the rotor, a rotating processing of rotating the d-axis and the q-axis in a direction opposite to rotation of the rotor, an acceleration processing of accelerating the rotation of the rotor, and a sensorless control processing of controlling the rotation of the rotor. | 10-29-2015 |
| 20150311847 | ROTATION ANGLE ESTIMATION MODULE FOR SENSORLESS VECTOR CONTROL OF PMSM - A rotation angle estimation module is provided. The rotation angle estimation module includes: a fixed flux instruction estimation unit calculating a rotating flux (λ | 10-29-2015 |
| 20150318804 | MOTOR CONTROL APPARATUS FOR VECTOR-CONTROLLING SENSORLESS MOTOR - A motor control apparatus that vector-controls a sensorless motor, including: an estimating unit configured to obtain an estimated phase value by estimating a phase of a rotor in the sensorless motor; and a generating unit configured to generate, from the estimated phase value and a phase command value of the rotor, a phase conversion value that is a phase difference between a rotary coordinate system and a static coordinate system in the vector control. The generating unit is further configured to output the phase command value as the phase conversion value when the rotor is caused to start to rotate, and change the phase conversion value so that the phase conversion value approaches the estimated phase value from a predetermined timing after the rotor is caused to start to rotate. | 11-05-2015 |
| 20150318805 | MULTI-MOTOR DRIVING DEVICE AND APPARATUS AND METHOD OF DRIVING MOTOR FOR WASHING MACHINE USING SAME - A motor driving apparatus for a washing machine, in which a motor is a washing machine motor with a double stator and a double rotor respectively having first and second U-phase, V-phase, and W-phase stator coils, includes: a motor controller for generating a drive signal in accordance with a washing mode, a rinsing mode and a dewatering mode; an inverter for generating a three-phase alternating-current (AC) power, in which any one-phase AC power of the three-phase AC power is applied in common to any one-phase stator coil of the first and second U-phase, V-phase, and W-phase stator coils for the washing machine motor; and a switching unit for switching to apply the remaining two-phase AC power of the three-phase AC power to any two-phase stator coils of the remaining two-phase stator coils of the first and second U-phase, V-phase, and W-phase stator coils for the washing machine motor. | 11-05-2015 |
| 20150318808 | BRUSHLESS MOTOR CONTROL METHOD AND BRUSHLESS MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE - A control device | 11-05-2015 |
| 20150326163 | PERIODIC DISTURBANCE AUTOMATIC SUPPRESSION DEVICE - In suppression of torque ripple with a periodic disturbance observer, adjustment of a gain portion is determined sequentially during monitoring operation of monitoring an operating condition. Therefore, many adjusting parameters are involved and achievement of correction is dependent on the skill of a person in charge of adjustment or design. | 11-12-2015 |
| 20150333670 | SYNCHRONOUS MOTOR CONTROL DEVICE FOR ELECTRIC AUTOMOBILE - A synchronous motor control device for an electric vehicle is provided which is able to reduce torque ripple through simple calculation and is excellent in practicability. In a synchronous motor control device which controls a traction synchronous motor, torque ripple compensation unit is provided which adds, to a motor drive current, a sine-wave correction current whose phase is opposite to that of torque ripple which is generated in the motor and has a frequency which is six times that of a rotation speed of the motor. Specifically, in the case of a configuration including a vector control type basic controller, the torque ripple compensation unit outputs a correction current command iq_c, and a value iq_ref obtained by adding the correction current command iq_c to a q-axis current command is used for control. | 11-19-2015 |
| 20150333681 | APPARATUS FOR CONTROLLING CONTROLLED VARIABLE OF ROTARY MACHINE TO COMMAND VALUE - In a control apparatus, an interference-reduction current calculator calculates, as an interference reduction current, a component of a current vector in a coordinate axis in a rotating coordinate system defined with respect to a rotor of the rotary machine. The current vector flows in the rotary machine, and the coordinate axis serves as an interference reduction coordinate axis in which the component of the current vector has reduced interference from change of the phase of the output voltage vector. An amplitude setter sets, as a manipulated variable for feedback controlling the interference reduction current to a command current value based on a command value for a controlled variable, one of: an amplitude of the output voltage vector, and an amplitude parameter indicative of a component of the output voltage vector. The component of the output voltage vector depends on the amplitude of the output voltage vector. | 11-19-2015 |
| 20150333682 | MOTOR CONTROL DEVICE - To achieve smooth switching of control without fluctuations in speed and torque, an excitation current command is allowed to transit linearly or in accordance with the function of speed between a value under sensorless vector control and a value under low-speed region control in accordance with a speed command or estimated speed in a speed region where the control is switched or in an adjacent speed region where sensorless vector control is performed. Therefore, abrupt variations in excitation current are reduced before and after the switching of the control. | 11-19-2015 |
| 20150340971 | Method for synchronizing a synchronous reluctance electric machine - A method of synchronizing a synchronous reluctance electric machine wherein the machine has no speed and/or residual magnetization voltage sensor and includes power terminals and rotating masses whose mechanical rotation frequency is subjected to speed transients caused by power cut-off conditions. The method includes at least one step of applying a control voltage with predetermined amplitude and duration to the terminals after the transients, and one step of detecting the electric current induced by the control voltage, the current induced by the voltage having a harmonic spectrum variable according to the frequency differential between the frequency of the control voltage and the mechanical rotation frequency of the rotating masses, to restore power and synchronous rotation control of the machine. | 11-26-2015 |
| 20150340979 | Improvements in Motor Controllers - A method of estimating the position of a rotor of an electric motor comprises producing an output signal indicative of motor position using a position sensor which comprises a detector and at least one encoder which rotates along with the rotor of the motor and includes a plurality of encoding regions, the output signal of the sensor varying in a stepwise fashion as the encoding regions move past the detector, and passing the output of the sensor through a smoothing algorithm to produce an estimated position signal, the algorithm being arranged to smooth the transition between the steps in the output of the sensor by causing the estimated position signal to lag behind the output of the sensor following a step change in the output of the sensor. | 11-26-2015 |
| 20150349682 | Control of Electric Motors - A control system for a multiphase electric motor comprises processing means arranged to determine a pattern of PWM voltage waveforms to be applied to respective phases of the motor, the processing means assigning different PWM patterns for use with different motor positions. In use for a given rotational position of the motor the processing means is normally adapted to apply PWM waveforms according to the assigned PWM pattern unless a different PWM pattern is currently in use at that time, except that in the event that the demanded voltage waveforms cannot be achieved with the current PWM pattern the processing means is adapted to force the PWM pattern to change. Upon the rotor moving into a different position associated with a different assigned pattern the processing means forces the PWM pattern to change to the assigned PWM pattern. | 12-03-2015 |
| 20150357934 | METHOD AND DEVICE FOR CONTROLLING AN INVERTER - The invention relates to a method for controlling an inverter ( | 12-10-2015 |
| 20150357953 | METHOD FOR CONTROLLING AC MOTOR - Provides a method for controlling an AC motor, including: receiving a torque command value; generating a command current based on the torque command, and a command voltage by using the generated command current in a current vector controller (CVC) current control mode; switching to a hexagon voltage manipulating controller (HVMC) voltage control mode when the command voltage enters a voltage limit area, and generating a command voltage in the HVMC voltage control mode; and controlling torque of an AC motor by using the command voltage that is generated in the CVC current control mode or the HVMC voltage control mode. | 12-10-2015 |
| 20150357954 | APPARATUS AND METHOD FOR MINIMIZING INFLUENCE OF TEMPERATURE CHANGE IN MOTOR - An apparatus for minimizing an influence of a temperature change may include a motor, a temperature sensor for sensing a temperature of the motor to create the temperature information, a command compensation unit compensating a torque command or a magnetic flux demand according to the information on the sensed temperature to create a compensation torque command value or a compensation magnetic flux command value, and an inverter for driving the motor according to a D-axis voltage command value and a Q-axis voltage command value are created according to a D-axis current command value and a Q-axis current command value which are matched with the compensation torque command value or the compensation magnetic flux command value. | 12-10-2015 |
| 20150357956 | ROTARY ELECTRIC MACHINE CONTROL DEVICE - A rotary electric machine control device that controls a rotary electric machine that includes a rotor in which a permanent magnet is disposed so as to provide magnetic saliency, and that performs feedback control on the rotary electric machine on the basis of a deviation between a current command and a feedback current from the rotary electric machine in a d-q-axis vector coordinate system defined by a d-axis which extends in a direction of a magnetic field produced by the permanent magnet and a q-axis which is orthogonal to the d-axis. | 12-10-2015 |
| 20150372623 | DECOUPLING CURRENT CONTROL UTILIZING DIRECT PLANT MODIFICATION IN ELECTRIC POWER STEERING SYSTEM - A method of controlling an electric motor that generates an output current from an input voltage command that includes a sum of a first voltage command and a second voltage command is provided. The method receives the output current from the motor as a feedback. The method determines a first set of gain factors to generate the first voltage command based on the feedback such that the input voltage command causes the motor to generate the output current with reduced influence of variations of a set of operating parameters of the motor. The method determines a difference between the feedback and a desired current. The method determines a second set of gain factors to generate the second voltage command based on the difference such that the input voltage command causes the motor to generate the output current as a first, second or higher order response. | 12-24-2015 |
| 20150372629 | SYSTEM, METHOD AND APPARATUS OF SENSOR-LESS FIELD ORIENTED CONTROL FOR PERMANENT MAGNET MOTOR - A sensor-less control system, a method and an apparatus of sensor-less field oriented control for permanent magnet motors are provided. The sensor-less control system includes a Clarke transform module, a Park transform module and an angle estimation module. The Clarke transform module generates orthogonal current signals in accordance with motor phase currents. The Park transform module generates a current signal in response to the orthogonal current signals and an angle signal. The angle estimation module generates the angle signal in response to the current signal. The angle signal is related to a commutation angle of the permanent magnet motor. The current signal is controlled approximate to zero. The angle signal associated with an angle-shift signal is configured to generate three phase motor voltages. | 12-24-2015 |
| 20150372630 | FAN MOTOR DRIVE DEVICE AND BLOWER DEVICE - A fan motor drive device configured to drive a fan with a motor includes a position speed estimating calculator configured to calculate estimated values of a rotation angle and a rotation speed of the motor, a multiplier configured to calculate a control target value by multiplying the rotation speed calculated in the position speed estimating calculator and a flow coefficient, and a current vector controller configured to control a drive current of the motor by feedback control based on the control target value. A rotor magnetic flux intensity of the motor is calculated based on at least a drive current obtained by a current sensor and the rotation angle obtained from the position speed estimating calculator, and a control value used in driving the motor is changed by the rotor magnetic flux intensity thus calculated. | 12-24-2015 |
| 20150381084 | Method and Device for Operating an On-Board Power System - An on-board power system has a three-phase motor having a first and at least a second at least three-phase winding, a first and a second electric component energy on-board power system, as well as a first and a second actuator element, which are each electrically connected to one of the windings and one of the electric component energy on-board power systems. In order to transfer energy between the first and second electric component energy on-board power systems, the first actuator is actuated to generate a voltage in the first at least three-phase winding, such that a voltage is induced in the second at least three-phase winding, a result of which is to transfer energy between the first and the second partial-energy on-board power system, and wherein the generated voltage in the first at least three-phase winding is an AC voltage with voltage vectors oriented to contribute to the fact that substantially no torque is generated in the rotor by the voltage generated for the energy transfer in the first winding. | 12-31-2015 |
| 20150381092 | CONTROLLER FOR POWER CONVERTER - A controller for a power converter detects a current output from the power converter, estimates a flux vector of the motor, and calculates a torque line in a physical model resulting from mathematizing a circuit equivalent to the motor, based on the estimated flux vector. The torque line indicates a line for obtaining a desired torque in a subsequent control period. The controller calculates a stator flux command value in accordance with a loss, calculates a voltage command value based on the torque line and the stator flux command value, and controls an output voltage. | 12-31-2015 |
| 20150381095 | INVERTER CONTROL APPARATUS AND CONTROL METHOD THEREOF - An inverter control apparatus and a control method thereof are provided. The inverter control apparatus and a control method thereof stably operate a three-phase motor using a capacitor having a small capacitance for a DC link. The inverter control apparatus includes a current sensor to sense an output current of the inverter, a voltage sensor to sense a DC-link voltage of the inverter, and a controller to generate an average of a periodically varying rotor based q-axis current boundary value based on the output current and the DC-link voltage to generate a current reference on the basis of the average of the rotor based q-axis current boundary value, and to drive a three-phase motor based on the current reference. Stabilized variable speed control of a motor by using a small-capacitance capacitor for a DC link of an inverter is performed and reliability of an inverter circuit improved. | 12-31-2015 |
| 20160006381 | DEVICE AND METHOD OF 6-STEP CONTROLLING INVERTER OF MOTOR DRIVING SYSTEM - A device and a method of 6-step controlling of an inverter of a motor driving system are provided. The device and method and apply a voltage to a motor by adopting a 6-step control scheme capable of maximally using an input voltage of the inverter to improve output efficiency of the inverter and the motor and thus improve fuel efficiency of an environmentally friendly vehicle. | 01-07-2016 |
| 20160006385 | CONTROL DEVICE AND METHOD FOR IMPROVING VOLTAGE UTILIZATION RATIO OF INVERTER FOR GREEN CAR - A control device and a control method can improve a voltage utilization ratio of an inverter for a green car, in which an input DC voltage of the inverter is modulated by a maximum amount into an output AC voltage of the inverter by changing the output AC voltage incapable of being linearly output into a voltage capable of being linearly output. The control method includes steps of: generating a two-phase current command having two phases of a first current command and a second current command; generating a two-phase voltage command having two phases of a first voltage command and a second voltage command; generating a three-phase pole voltage command; modulating the three-phase pole voltage command into a linear output voltage capable of being linearly output; and calculating a voltage gain value, using the two-phase voltage command and an input DC voltage of the inverter. | 01-07-2016 |
| 20160013738 | ROTARY MACHINE CONTROLLER | 01-14-2016 |
| 20160028337 | CONTROL SYSTEM FOR A SYNCHRONOUS MACHINE AND METHOD FOR OPERATING A SYNCHRONOUS MACHINE - The invention relates to a method for operating a synchronous machine, comprising the following steps: determining a difference value between the rotor inductance of the synchronous machine in the polar axis direction and the rotor inductance of the synchronous machine in the pole-gap direction for each of a plurality of different 2-tuples from values of useful current adjusted in the rotor-fixed coordinate system of the synchronous machine; preparing a characteristic diagram for the determined difference values in dependence on the 2-tuples of the values of useful current; determining a torque-dependent operating-point trajectory for the 2-tuples of the values of useful current taking into account the magnitude of the determined difference values along the operating-point trajectory to be determined; and operating the synchronous machine according to the determined operating-point trajectory. | 01-28-2016 |
| 20160028339 | APPARATUS FOR CONTROLLING ROTARY MACHINE - In a control apparatus, a target harmonic current obtainer obtains, according to a phase current flowing through at least one phase winding of a stator, a target harmonic current component flowing in a rotary machine. The target harmonic current component is included in a fundamental current component of the phase current. An inducing unit superimposes, on the phase information, a fluctuating signal that changes at an angular velocity identical to an angular velocity of the target harmonic current component, to induce a counteracting harmonic current component in the at least one phase winding. The counteracting harmonic current component counteracts the target harmonic current component. | 01-28-2016 |
| 20160028340 | APPARATUS FOR CONTROLLING ROTARY MACHINE - In a control apparatus, a target harmonic current obtainer obtains, according to a phase current flowing through at least one phase winding of a stator of a rotary machine, a target harmonic current component flowing in the rotary machine. The target harmonic current component correlates with a fundamental current component of a phase current. An inducing unit superimposes, on at least one of the amplitude and the phase of an output voltage vector of a power converter used by a switching unit, a harmonic signal that changes at an angular velocity identical to an angular velocity of the target harmonic current component. This induces a counteracting harmonic current component in the at least one phase winding. The counteracting harmonic current component counteracts the target harmonic current component. | 01-28-2016 |
| 20160036364 | MOTOR CONTROL DEVICE, AND METHOD AND DEVICE FOR ESTIMATING MAGNETIC FLUX OF ELECTRIC MOTOR - A motor control device is provided, which includes a power converter for applying output voltage according to a voltage command to an electric motor, a magnetic flux estimator for estimating a vector of stator magnetic flux of the electric motor based on a difference between the output voltage and a voltage drop caused by a coil resistance of the electric motor, and a phase estimator for estimating a phase of the stator magnetic flux based on the vector of the stator magnetic flux estimated by the magnetic flux estimator. The magnetic flux estimator includes a variable low-pass filter for applying a low-pass filter to the difference at a cut-off frequency according to a frequency of the output voltage, and a phase adjuster for retarding at least one of an output phase of the variable low-pass filter and a phase of the difference before inputted into the variable low-pass filter. | 02-04-2016 |
| 20160043671 | Motor Drive Circuit and Method of Driving a Motor - A drive system for a brushless DC motor having a rotor includes at least one permanent magnet and a stator including at least one phase winding. The system has a drive circuit including a switch associated with the winding for varying the current passing through the winding; a rotor position sensor arranged to sense the position of the rotor; and a controller arranged to provide drive signals to control the switch. The drive system is further arranged to receive a temperature signal that has a value dependent upon the temperature of the at least one magnet of the rotor. The controller is arranged to vary the phase of the current passing through the winding relative to the rotor position dependent upon the temperature of the rotor magnet. | 02-11-2016 |
| 20160043676 | METHOD FOR OPERATING A MULTIPHASE ELECTRIC MACHINE AND CORRESPONDING MULTIPHASE ELECTRIC MACHINE - In a method for operating a multiphase electrical machine, which includes a rotor and a rotary encoder operatively connected to the rotor, an actual rotational angle of the rotor is determined from a measured rotational angle determined by means of the rotary encoder and a rotational angle offset. To determine the rotational angle offset the rotor is brought to a specific rotational speed and then an active short circuit of the electrical machine is initiated, wherein an actual current vector is determined, using a dq-transformation, from the current intensities of the currents flowing in at least two of the phases of the electrical machine and the measured rotational angle determined by means of the rotary encoder, and wherein the rotational angle offset is calculated from the actual current vector and a reference current vector. | 02-11-2016 |
| 20160043678 | MOTOR CURRENT MAPPING - An electric machine combined with an electronic control unit including a set of onboard maps of a same setpoint parameter on the basis of first and second operating variables of the machine, each of the maps being associated with a different level of a third operating parameter of the electric machine. The maps include ranges of authorized values, and at least one range of extrapolated values. The electronic control unit is configured, for values of the third parameter not associated with one of the onboard maps, to use interpolated values between two authorized values, or between one authorized value and one extrapolated value. | 02-11-2016 |
| 20160056737 | REDUCTION TECHNIQUE FOR PERMANENT MAGNET MOTOR HIGH FREQUENCY LOSS - A system including a motor loss reducing controller system utilizing input band-shifting, an integral control architecture and inverse band-shifting is disclosed. The motor loss reducing controller system may provide correction of harmonic currents flowing to a PM motor from a motor controller. The compensation is added to the PWM voltage command signals. Within a compensator, d-axis and q-axis current feedback signals are frequency shifted down by n times the fundamental frequency. This converts the initial motor stationary harmonic currents into DC values. The frequency shifting is completed by multiplying the feedback signal by sine and cosine carrier signals of the shifted frequency. An integral controller may cancel any component of error at a desired DC value. An inverse frequency-shift transformation is applied to the output of the I controller in order to shift the command output signal back to the original reference frame. | 02-25-2016 |
| 20160056745 | ROTARY ELECTRIC MACHINE CONTROL APPARATUS - A rotary electric machine control apparatus controlling drive of a rotary electric machine includes a pre-limit d-axis voltage arithmetic portion calculating a pre-limit d-axis voltage command value; a pre-limit q-axis voltage arithmetic portion calculating a pre-limit q-axis voltage command value; a d-axis limit portion calculating a d-axis voltage command value; and a q-axis limit portion calculating a q-axis voltage command value. When an absolute value of the pre-limit q-axis voltage command value is greater than an absolute value of a second limit value, and an absolute value of a previous q-axis voltage command value is equal to or greater than the absolute value of the second limit value and is equal to or less than an absolute value of a first limit value, the q-axis limit portion determines a previous q-axis voltage command value as the q-axis voltage command value. | 02-25-2016 |
| 20160065108 | Electric Motor Current Controller with Negative Sequence Harmonic Suppression - A current controller is provided having a positive sequence controller and a negative sequence controller, where error signals operated on by the positive sequence controller are transformed into a negative sequence reference frame and input to the negative sequence controller. A current controller is also provided having a positive sequence controller, a negative sequence controller, and one or more delay state feedbacks to counter control loop delays, where the delay state feedbacks provide high bandwidth, low current overshoot, small current rise time and good current stability margins. A current controller is also disclosed having a positive sequence controller, a negative sequence controller, and one or more cross coupled gains between a d-axis and a q-axis, where the cross coupled gains are proportional to the speed of a motor associated with the current controller. | 03-03-2016 |
| 20160065109 | POSITION ESTIMATION DEVICE, MOTOR DRIVE CONTROL DEVICE, POSITION ESTIMATION METHOD AND RECORDING MEDIUM - A position estimation device for estimating a position of a rotator of a motor includes an estimation unit configured to estimate a rotational position of the rotator of the motor using a magnetic flux estimation value of the motor, which is calculated by inputting an electric voltage instruction value to be inputted to the motor and a coil electric current value detected from the motor into a motor model in which the motor is identified; and a derivation unit configured to derive a magnetic flux deviation amount due to a distortion of a magnetic flux waveform of the motor according to the estimated rotational position. The estimation unit corrects the magnetic flux estimation value based on the derived magnetic flux deviation amount, modifies the estimated rotational position based on the corrected magnetic flux estimation value, and outputs the modified rotational position. | 03-03-2016 |
| 20160072416 | MOTOR DRIVE DEVICE - [Object] To effectively improve torque of a motor, the maximum rotation rate in driving with no load, and output at a high rotation rate, while suppressing torque ripple, noise, or vibration of the motor. | 03-10-2016 |
| 20160072421 | MULTI-PHASE MOTOR CONTROL APPARATUS AND ELECTRIC POWER STEERING APPARATUS USING THE SAME - A multi-phase motor control apparatus that reduces the occurrence of the vibrations and the noises by setting the shift amount per time more finely after realizing a reduction in processing ability of a CPU by using a one-shunt type current detection circuit and an electric power steering apparatus using the same. The apparatus includes a PWM-signal generating section that generates plural second each-phase PWM-signals within two control periods based on the current estimation value and the carrier signal, and in a case that a phase shift amount of a predetermined phase in a just before control period is zero and a phase shift amount of a predetermined phase in a present control period is not zero, the phase shift control section gradually increases the phase shift amount from zero in the present control period and a next control period, and uses the second each-phase PWM-signals in the next control period. | 03-10-2016 |
| 20160079900 | MOTOR CONTROL DEVICE - A motor control device for controlling a multiphase brushless motor in a vector control manner includes: a current command value generation unit that generates q-axis and d-axis current command values; a controller that calculates q-axis and d-axis voltage command values; a saturation guard unit that corrects the q-axis or d-axis voltage command value to set a magnitude of a voltage vector of the q-axis or d-axis voltage command value to be equal to or smaller than a predetermined voltage guard value; and a current command value limiting unit that limits the q-axis or d-axis current command value using a current limit gain and a current guard value, which are calculated based on a voltage saturation amount as the magnitude of the voltage vector of the q-axis or d-axis voltage command value corrected by the saturation guard unit. | 03-17-2016 |
| 20160079901 | Four Quadrant Voltage Limiter for Rotor Flux Oriented Machine Control - Methods, systems and computer readable storage devices for a four quadrant voltage limiter that limits a commanded phase voltage to within a volt second capability of an inverter by maintaining a rotor flux and folding back a torque under both motoring and regeneration torque commands. In one embodiment: (a) in a motoring operation, an upper limit for a q-axis voltage is enforced; and (b) in a regeneration operation a lower limit for the q-axis voltage is enforced. | 03-17-2016 |
| 20160087568 | INPUT VECTOR SET FOR POSITION DETECTION OF PM MOTORS - A method of determining angular position (A) of a rotor of an N-phase permanent magnet motor (PMM). A processor having an associated stored angular position determination (APD) algorithm is programmed to implement the algorithm to cause an associated motor controller to execute steps including forcing one vector at a time a phase vector set of current or voltage vectors to stator terminals of windings for the N-phases a positive and negative magnitude vector, wherein the vector magnitude is sufficiently small to not move the rotor, and a time duration for the forcing current or voltage vectors is essentially constant. The resulting stator current or voltage levels are measured for each current or voltage vector. An N-dimension current vector or voltage vector is generated from superposition of the resulting stator current levels or resulting stator voltage levels. The N-dimension current vector or voltage vector is used to determine angular position. | 03-24-2016 |
| 20160094164 | ELECTRIC-VEHICLE CONTROL DEVICE - A control device for an electric vehicle which is able to accurately control a traction motor of the electric vehicle without any delay in control timing during rapid acceleration or rapid deceleration of the motor, is provided. The control device for the electric vehicle includes an ECU and an inverter device including a motor control module. A rotation angle sensor configured to detect a rotation angle of a motor is provided, and the motor control module is provided with a rotation angle correction section configured to correct a rotation angle of a rotor of the motor which is used for vector control, by using an angular speed of an electrical angle which is the rotation angle detected by the rotation angle sensor and a differential value of the angular speed of the electrical angle. | 03-31-2016 |
| 20160094173 | SYSTEMS AND METHODS FOR CONTROLLING HIGH SPEED MOTOR - A method for controlling an electric motor includes inputting a quadrature-axis current (I | 03-31-2016 |
| 20160094178 | METHOD FOR OPERATING POWER SEMICONDUCTORS - A method for operating power semiconductors arranged in converters, includes measuring with a temperature sensor a temperature of at least one of the power semiconductors, performing a comparison of the temperature of the at least one power semiconductor with a reference temperature and providing a result of the comparison; activating a pre-heating phase for preheating the power semiconductors as a function of the result; during the pre-heating phase, defining a pre-heating current; and impressing the pre-heating current into an electrical load. | 03-31-2016 |
| 20160105135 | CONTROL METHOD FOR REDUCING TORQUE RIPPLE IN AN ELECTRICAL MACHINE - A method of controlling torque ripple in an electrical machine that includes a field winding for creating nominally constant field current using DC current and an armature winding for creating a rotating magnetic field using AC current, calls for superimposing a spatially varying current component on to the DC current of the field winding. Other methods are also disclosed that are suitable for electrical machines that have a winding that is excited with nominal DC current including SRMs, FSMs, and wound-field synchronous motors. | 04-14-2016 |
| 20160111973 | METHOD AND DEVICE FOR CONTROLLING AN INVERTER - The invention relates to a method for controlling an inverter ( | 04-21-2016 |
| 20160111991 | MOTOR CONTROL DEVICE - A motor control device includes an electric power converter for generating three-phase voltages based on voltage instruction-values, and for supplying them to a motor; an induced-voltage estimation unit for estimating an induced voltage of the motor, based on the voltage instruction-values and electric current feedback values; a dead-time disturbance-voltage compensation unit; and a dead-time disturbance compensation-voltage modification unit for compensating a dead-time disturbance voltage(s) generated in the electric power converter, based on a fundamental wave component of an estimated induced voltage. | 04-21-2016 |
| 20160111992 | AUTOMATIC AND ADAPTIVE DEFLUXING DEVICE AND METHOD IMPLEMENTING SUCH A DEVICE - A vector control driving device is provided for an electric motor receiving an operating setpoint, with stator windings receiving a driving current and producing a rotating magnetic field, the windings generating a voltage at terminals of the motor, a rotor producing a magnetic field to follow the rotating magnetic field, the device generating current in a vector domain, and configured to carry out a transform of the current from the vector domain to a real domain allowing for generation of the driving current, and configured to carry out an inverse transform of a parameter measured in the real domain on the stator windings into a transform of the parameter in the vector domain, and comparing the value of the inverse transform of the parameter with a predefined maximum parameter value, which can drive the generating of the current in the vector domain. An automatic and adaptive defluxing method is provided. | 04-21-2016 |
| 20160118923 | BRUSHLESS MOTOR AND MOTOR CONTROL DEVICE - A brushless motor for an electric power steering device that assists a steering operation includes: a stator having a plurality of winding sets for a plurality of systems respectively; and a rotator having a ferrite magnet. In the motor, a maximum current flowing without any demagnetization at high temperature is large. Hence, the torque of the motor is easily ensured at high temperature. In particular, when a failure occurs in one system, it is easy to ensure the torque of the normal system even at high temperature. | 04-28-2016 |
| 20160126871 | MOTOR CONTROL DEVICE FOR CONTROLLING CURRENT PHASE ON dq/THREE-PHASE COORDINATES - A motor control device for controlling a three-phase AC motor by using dq-three-phase coordinate conversion includes a phase correction amount calculation unit for calculating a phase correction amount by using a detected motor speed and a q-axis current command initial value, a rotor phase angle correction unit for adding or subtracting the phase correction amount to or from a detected rotor phase angle of the motor to calculate a corrected rotor phase angle, and a coordinate conversion unit for performing coordinate conversion between parameters on a dq coordinate system and parameters on a three-phase coordinate system on the basis of the corrected rotor phase angle. | 05-05-2016 |
| 20160126877 | MOTOR CONTROL APPARATUS - A motor control apparatus that estimates a temperature of a temperature estimation target element at a time of energizing the motor and drives a motor by controlling an electric power is provided. The motor control apparatus includes a primary delay arithmetic unit that outputs a primary delay response as an amount of temperature change, a sensor value adder that adds a sensor value of a temperature sensor to the amount of temperature change, an offset adder that adds an offset temperature to an output of the sensor value adder, a response constant determination portion that determines the gain and the time constant, and an offset temperature determination portion. At least one of the response constant and the offset temperature is changed according to a supply voltage or an input voltage. | 05-05-2016 |
| 20160126881 | APPARATUS FOR CONTROLLING INVERTER - Disclosed herein is an apparatus for controlling an inverter in an inverter system. The apparatus includes: a first determining unit to determine a magnitude, a phase and a frequency of an input voltage to an electric motor in the inverter system; and a second determining unit to determine a restart command voltage for generating an inverter driving voltage larger than a residual voltage in the electric motor using the magnitude of the input voltage determined by the first determining unit, when the inverter system is restarted. | 05-05-2016 |
| 20160141983 | METHOD AND APPARATUS FOR CONTROLLING AN ELECTRIC MACHINE IN A SIX-STEP MODE - A voltage source inverter controller for controlling an inverter electrically connected to an electric machine includes a current command generator, a six-step flux controller and a current regulator. The six-step flux controller generates a flux modifier to regulate flux in a flux-weakening speed/load operating region of the electric machine when operating the electric machine in a six-step mode. The current command generator converts a desired torque to three-phase desired currents that are input to a dq0-dq transformer and combined with the flux modifier to determine a modified-flux direct-quadrature (dq) current request. The current regulator includes a proportional-integral feedback controller, anti-windup elements, a dq voltage limit element and a voltage magnitude limiter. The proportional-integral feedback controller and the anti-windup elements perform closed-loop current control on the modified-flux dq current request to determine commanded dq voltages. | 05-19-2016 |
| 20160141993 | EFFICIENT DAMPING OF VIBRATIONS OF AN ELECTRIC MACHINE - A first active part of a poly-phase electric machine is connected to a converter having a control facility. The control facility updates a base commutation angle using the target speed value and determines direct-axis and quadrature-axis component values of currents and a commutation angle supplied to the machine. Target and component quadrature-axis values are provided to a quadrature-axis portion of a current controller that determines a target value of the quadrature-axis voltage component. Target and component current values are supplied to a direct-axis portion of the current controller, which determines a target value of the direct-axis voltage component therefrom. The target value of the direct-axis and quadrature-axis voltage components and the commutation angle are used to determine the target output voltages provided to the converter. A damping commutation angle determined using target values of the quadrature-axis and direct axis voltage components is used to adjust the of the voltage. | 05-19-2016 |
| 20160141997 | DEVICE FOR CONTROLLING A POLYPHASE INVERTER - The device according to the invention controls a polyphase inverter ( | 05-19-2016 |
| 20160164443 | CONTROL DEVICE, DRIVING DEVICE, AND IMAGE FORMING APPARATUS - A control device includes a motor driving unit that supplies electric power to a motor according to a magnetic-pole-phase signal output from the motor; and a rotational-position detecting unit that converts the magnetic-pole-phase signal into a rotational-position detection signal and outputs the rotational-position detection signal. The rotational-position detection signal indicates a rotation amount and a rotation direction of an output shaft of the motor and has a higher resolution than the magnetic-pole-phase signal. | 06-09-2016 |
| 20160173018 | SENSORLESS MOTOR DRIVE VECTOR CONTROL | 06-16-2016 |
| 20160181954 | MOTOR CONTROL APPARATUS | 06-23-2016 |
| 20160181960 | MOTOR CONTROL APPARATUS AND MOTOR CONTROL METHOD | 06-23-2016 |
| 20160181961 | METHOD AND APPARATUS FOR AUTO-TUNING AN ELECTRIC MACHINE CURRENT REGULATOR | 06-23-2016 |
| 20160190961 | ELECTRIC MOTOR USING MULTIPLE REFERENCE FRAMES FOR FLUX ANGLE - A drive unit includes: an electric motor; a flux estimator circuit configured to estimate at least a flux angle; a synchronous frame generator coupled to a rotor of the AC induction motor and configured to detect a rotor mechanical angle; and a switch configured to selectively provide either the flux angle or the rotor mechanical angle for controlling the motor. | 06-30-2016 |
| 20160204726 | CONTROL APPARATUS FOR AC ROTARY MACHINE | 07-14-2016 |
| 20160204727 | CONTROLLER AND CONTROL METHOD FOR ROTARY ELECTRIC MACHINE | 07-14-2016 |
| 20160254770 | MOTOR CONTROL DEVICE | 09-01-2016 |
| 20160254771 | DIRECT TORQUE CONTROL OF AC ELECTRIC MACHINES | 09-01-2016 |
| 20170237375 | DETECTION OF OFFSET ERRORS IN PHASE CURRENT MEASUREMENT FOR MOTOR CONTROL SYSTEM | 08-17-2017 |
| 20180026559 | ROTATION ANGLE ESTIMATION APPARATUS FOR ROTATING ELECTRIC MACHINE | 01-25-2018 |
| 20190149077 | MOTOR CONTROL DEVICE | 05-16-2019 |
| 20190149078 | MOTOR CONTROL DEVICE | 05-16-2019 |
| 20190149079 | METHOD FOR SWITCHING OFF A POLYPHASE ELECTRICAL MACHINE IN A MOTOR VEHICLE | 05-16-2019 |
