| Entries |
| Document | Title | Date |
|---|
| 20080252244 | SENSORLESS SPEED DETECTION OF A PM BRUSHLESS MOTOR WITH PHASE TERMINALS SHORTED - A method of determining the speed of a spinning sensorless brushless motor driven by an inverter when the phase terminals of the motor are shorted including determining a voltage related to the voltage developed in a phase leg of the inverter; from the determined voltage, determining the direction of current and providing a first signal determining transitions between current flowing in each of two directions; and from the first signal, determining the frequency of the current and thus the motor speed. | 10-16-2008 |
| 20080309268 | Initial Pole Position Estimating Apparatus and Method for Ac Synchronous Motor - The present invention provides an initial pole position estimating apparatus and method for an AC synchronous motor without using magnetic pole detector. The initial pole position estimating apparatus includes a thrust force or torque pattern generating portion for generating a thrust force or torque pattern, a pole position command generating portion for generating a pole position command, and a position detecting portion for detecting a position of the AC synchronous motor. The initial pole position estimating apparatus can estimate an initial pole position in a short time with high precision without depending on a fluctuation in a load. The initial pole position estimating apparatus further includes a pole position correcting portion ( | 12-18-2008 |
| 20090009114 | SYNCHRONOUS MACHINE - The invention relates to a synchronous machine provided with a stator and rotor, wherein the stator comprises stator teeth ( | 01-08-2009 |
| 20090033262 | Sensorless controlling apparatus of brushless motor - A sensorless controlling apparatus for controlling a brushless motor includes a speed calculator for calculating speed of a rotor ω, an angle calculator for calculating rotor angle θ at a predetermined time interval, and an angle controller for calculating correction angle Δθ based on the current value of a d-axis current (d-axis current value i | 02-05-2009 |
| 20090039810 | SYSTEM FOR SEAMLESS ESTIMATION OF SPEED AND/OR POSITION, INCLUDING STANDSTILL OF A PERMANENT MAGNET ROTOR OF AN ELECTRIC MOTOR - Procedure for determining the electrical drive speed (ω | 02-12-2009 |
| 20090134826 | CONTROLLER OF MULTI-PHASE ELECTRIC MOTOR - A controller of a multi-phase electric motor has a drive section, including a pair of upper arm switching element and a lower arm switching element, for driving the multi-phase electric motor, a single current detection section for detecting a current value of the multi-phase electric motor, a pulse width modulation signal (PWM) generation section for generating a PWM signal of each phase based on the current value detected by the current detection section and a saw-tooth signal having a predetermined frequency, a current detectability determination section for determining whether or not the current value is detectable in the current detection section based on the PWM signal of each phase generated by the PWM signal generation section, a switching number determination section for determining whether or not conducting number of the upper arm switching element is an even number or an odd number based on the determination that the current is not detectable by the current detectability determination section, a phase movement section for moving a phase of the PWM signal of a predetermined phase generated by the PWM signal generation section based on the determination result of the switching number determination section and outputting to the drive section, and each phase current calculation section for calculating a current value of each phase based on the current value detected by the current detection section and the PWM signal of each phase generated by the PWM signal generation section. | 05-28-2009 |
| 20090174354 | Method for determining the position of a rotor of an electric motor without sensors - Disclosed is a method for detecting the current position of a rotor, in particular the angle of rotation of the rotor, an electromotor and a method for detecting the speed and/or the angle of rotation of an electromotor. The speed of the electromotor is hereby implied inter alia from the number of zero crossings of a comparison signal of the armature resistances or respectively conductances determined continuously in time and the average values of the armature resistances or respectively conductances determined continuously in time. | 07-09-2009 |
| 20090195200 | ELECTRIC MOTOR DRIVE SYSTEM AND ELECTRIC MOTOR CONTROL METHOD - An electric motor drive system having current detecting sections for detecting the currents flowing into electric motors, speed variation calculating sections for calculating the speed variation estimating values for the electric motors in accordance with the motor currents detected by the current detecting sections and the current command values for the motors corresponding to the detected currents and a speed uniformizing voltage compensating section for delivering the values that serve to compensate the amplitudes of the voltages applied to the electric motors in such a manner that the speed variation estimating values calculated by the speed variation calculating sections become equal to a predetermined value. | 08-06-2009 |
| 20090218973 | CONTROL OF SWITCHED RELUCTANCE MACHINES - A flux switching electric motor ( | 09-03-2009 |
| 20090224712 | HEAT-EXCHANGE COOLING DEVICE AND POWER SUPPLY CIRCUIT DRIVER USED THEREFORE - A heat exchange cooler capable of eliminating continuous radiation of high-frequency noise waves and reducing the man hour for the installation work, and a power circuit driving device used for it are provided. A commercial power transformer ( | 09-10-2009 |
| 20090256511 | Direct Flux Regulated Permanent Magnet Brushless Motor Utilizing Sensorless Control - A permanent magnet rotor for use in a flux regulated permanent magnet brushless machine is constructed such that the inductance along the direct and quadrature axes is markedly different to provide sensorless position feedback for the rotor. | 10-15-2009 |
| 20090309528 | Motor driving system and controlling method of the same - A plurality of current sensors are provided to correspond to a plurality of inverter circuits for driving a plurality of motor generators, respectively. Zero point adjustment of each current sensor is executed in a non-energized state recognized based on a stop of operation of the corresponding inverter circuit and when noise influence is determined to be small based on stops of operations of the other inverter circuits in the same casing. As a result, it is possible to avoid a risk of performing the zero point adjustment in a state in which an output of the current sensor is not exactly a value corresponding to zero current due to the noise influence from the other inverter circuits. In this way, it is possible to highly accurately execute the zero point adjustment of the current sensor for measuring motor driving current. | 12-17-2009 |
| 20100007297 | Sensorless Drive for Unipolar Three Phase Brushless DC Motors - A system for controlling a trapezoidally (square wave) driven DC motor includes a unipolar commutation circuit coupled between a DC power supply and a brushless DC motor. The motor has three phases formed by respective stator windings coupled at respective proximal ends to a common node and having respective opposite ends remote from the common node. The commutation circuit drives the motor according to a commutation cycle including three primary steps. During each primary step, one of the phases is driven while the other two phases are not driven. Voltages at the remote ends of the undriven phases are sensed, and timing signals are generated at points where the voltages coincide. The timing signals are used to determine motor position and speed, and to synchronize the commutation cycle with motor position and speed. In one embodiment, the commutation cycle includes transitional steps between the primary steps for smoother operation. The system is compatible with high side and low side switching configurations. | 01-14-2010 |
| 20100052586 | DETECTOR CIRCUIT - The invention relates to a detector circuit for detecting a change in voltage at a terminal or node with respect to a reference potential. The detector circuit comprises an electronic switch with a control terminal, which has a predetermined switching potential at which the switch operates, and with a detection signal output for outputting a detection signal, and a voltage matching circuit, which provides a control potential at the control terminal of the switch which corresponds to a potential of the terminal which has changed by a predetermined, fixed potential absolute value. The predetermined fixed potential absolute value is selected in such a way that the control potential corresponds to the switching potential or approximately to the switching potential when the reference voltage is applied to the terminal in such a way that the change in voltage to be detected causes the switching potential of the electronic switch to be exceeded or undershot. | 03-04-2010 |
| 20100052587 | DETERMINING A POSITION OF A MOTOR USING AN ON-CHIP COMPONENT - An embodiment of a motor controller includes first and second supply nodes, a motor-coil node, an isolator, a motor driver, and a motor position signal generator. The isolator is coupled between the first and second supply nodes, and the motor driver is coupled to the second supply node and to the motor-coil node. The motor position signal generator is coupled to the isolator and is operable to generate, in response to the isolator, a motor-position signal that is related to a position of a motor having at least one coil coupled to the motor-coil node. By generating the motor-position signal in response to the isolator, the motor controller or another circuit may determine the at-rest or low-speed position of a motor without using an external coil-current-sense circuit. | 03-04-2010 |
| 20100134060 | CONTROL CIRCUIT FOR A BRUSHLESS DC MOTOR AND METHOD THEREFOR - A control circuit ( | 06-03-2010 |
| 20100231153 | Driving apparatus for three-phase AC synchronous motor - In a driving apparatus for a three-phase synchronous motor, in which a battery is connected between a neutral point of a stator coil and a negative-pole bus, a control circuit acquires three-phase AC currents. The control circuit checks whether a neutral-point electric current is contained in an electric current detected by an electric current detecting section. Based on the check result, the control circuit checks whether electric current values for three-phases containing the neutral-point electric current are set together or electric current values for three-phases excluding the neutral-point electric current are set together to acquire the three-phase AC currents for driving the motor. | 09-16-2010 |
| 20100231154 | MOTOR CONTROL DEVICE AND MOTOR SYSTEM - A motor control device has first to third amplifiers which amplify voltage generated at first to third shunt resistances connected to first to third drivers to supply driving current of each of three phases to a three-phase brushless motor, first to third sample-hold circuits which sample and hold voltage amplified by the first to third amplifiers, a multiplexer which sequentially selects and outputs voltage values held by the first to third sample-hold circuits, an A/D converter which performs A/D conversion on output signals of the multiplexer, and an arithmetic unit which calculates the driving current through an output signal of the A/D converter, estimates a magnetic pole position of the motor based on the driving current, and performs pulse width modulation (PWM) control on the driving current by controlling the first to third drivers. | 09-16-2010 |
| 20100295489 | MOTOR DRIVE CONTROL APPARATUS - There is provided a motor drive control apparatus that includes a resistor, which directly or indirectly detects a driving current supplied to a motor and generates a voltage corresponding to the driving current, converts, with an AD converter, the voltage corresponding to the motor driving current detected by the resistor into a numerical value, and reflects the motor driving current converted into the numerical value on driving control for the motor, wherein a plurality of the resistors is connected in series to form a resistor string, and voltage between arbitrary two points of the resistor string is AD-converted. | 11-25-2010 |
| 20110006714 | Apparatus and Method for Providing Information Relating to a Motor - This invention relates to an apparatus and method for deriving speed and position information for an electric motor. Apparatus for and a method of controlling a motor | 01-13-2011 |
| 20110006715 | Control Unit and Control Method for Permanent Magnet Synchronous Motor - If magnitude relations between the output terminal voltage based on a DC negative terminal of the inverter and a threshold voltage that is a fixed value are compared, polarity thereof is changed at a predetermined rotor phase. The magnitude relation, for example, is detected by an inexpensive and simple apparatus such as a level shift circuit and a NOT circuit. The rotor phase of the permanent magnet synchronous motor is inferred on the basis of changes in the magnitude relation and if it is differentiated, a rotation speed is inferred. If the inferred values of the rotor phase and rotation speed are fed back to synchronous operation or vector control, the free-running permanent magnet synchronous motor is restarted. | 01-13-2011 |
| 20110062909 | POSITION SENSORLESS CONTROL OF PERMANENT MAGNET MOTORS - Methods and apparatus are provided for sensorless control of a permanent magnet motor. The method includes the step of determining a sensorless position signal and a sensorless speed signal in a torque-speed plane in response to phase currents corresponding to currents on one or more of the plurality of phases. | 03-17-2011 |
| 20110084638 | METHODS, SYSTEMS AND APPARATUS FOR DYNAMICALLY CONTROLLING AN ELECTRIC MOTOR THAT DRIVES AN OIL PUMP - Methods, system and apparatus are provided for sensorless control of a vector controlled motor drive system that includes an electric motor used to drive an auxiliary oil pump. | 04-14-2011 |
| 20110169438 | METHOD AND SYSTEM FOR CONTROLLING AN ELECTRIC MOTOR USING ZERO CURRENT OFFSET VALUE CANCELLATION - Methods and systems for controlling an electric motor are provided. The electric motor includes at least one winding. A winding current flowing through the at least one winding is monitored. The winding current has an oscillating component and an offset component. The offset component of the winding current is isolated from the oscillating component of the winding current. The electric motor is controlled based on the offset component of the winding current. | 07-14-2011 |
| 20110175560 | MOTOR MAGNETIC-POLE-POSITION ESTIMATING APPARATUS - A motor magnetic-pole-position estimating apparatus includes a command voltage output device and a current detector. A model-current calculator is configured to calculate a model current corresponding to a voltage equation for a predetermined model of a motor based on a command voltage and an actual current. A current-difference calculator is configured to calculate a current difference between the model current and the actual current. Each of first and second magnetic-pole-position-difference calculators is configured to calculate a magnetic-pole-position difference between an actual magnetic-pole position of the motor and an estimated or designated magnetic-pole position based on the current difference depending on whether or not a rotation speed of the motor is lower than a predetermined value. A magnetic-pole-position calculation device is configured to calculate the magnetic-pole position of the motor based on the magnetic-pole-position difference calculated by the first or second magnetic-pole-position-difference calculator. | 07-21-2011 |
| 20110248658 | APPARATUS AND METHOD FOR DETERMINING ANGULAR POSITION - The position of a rotor of a motor is determined. The motor includes the rotor and a stator and the stator includes a plurality of coils. The rotor further includes at least one rotating magnetic field device. When the rotor is moving below a threshold speed, the current in each of the plurality of coils of the stator is measured. A pre-programmed data structure is accessed. The pre-programmed data structure stores a plurality of stator currents associated with a plurality of predetermined rotor positions. A first absolute position of the rotor is determined from the data structure according to the measured current from each of the plurality of coils. When the rotor is moving above the threshold speed, one or more rising or falling edges of magnetic field strength associated with the at least one rotating magnetic field device of the rotor are sensed. At least one timing aspect of the rising and falling edges of magnetic field strength are compared to determine a second absolute position of the rotor. | 10-13-2011 |
| 20110304290 | CONTROL APPARATUS AND CONTROL METHOD FOR ELECTRIC ROTATING MACHINE - A controller outputting voltage instructions for drive control of an electric rotating machine adds, by using adders, position estimation voltage instructions for estimating the rotor position generated by a position estimation voltage generator, to drive voltage instructions, and outputs the resultant signals as voltage instructions. A position estimation device includes current extractors for extracting position estimation currents having the same frequency components as that of the position estimation voltage instructions, from electric rotating machine currents detected by a current detector, a position estimation current amplitude calculation section for calculating position estimation current amplitudes from the position estimation currents; and an estimation position calculation unit for calculating an estimated position of the electric rotating machine, based on the position estimation current amplitudes. The position estimation current amplitude calculation section calculates the position estimation current amplitudes, based on an autocorrelation obtained by squaring the position estimation currents. | 12-15-2011 |
| 20120086374 | INVERTER DEVICE, MOTOR DRIVING DEVICE, REFRIGERATING AIR CONDITIONER, AND POWER GENERATION SYSTEM - An inverter device, a motor driving device, a refrigerating air conditioner, and a power generation system, which can reduce the recovery loss thereof, are obtained. A plurality of arms that can conduct and block current are provided. At least one of the plurality of arms includes: a plurality of switching elements each having a parasitic diode and being connected in series with each other; and a reverse current diode connected in parallel with the plurality of switching elements. | 04-12-2012 |
| 20120169264 | METHOD AND APPARATUS FOR COMMUTATING A BRUSHLESS DC MOTOR - Traditionally, controllers for brushless, sensorless direct current (DC) motors (in, for example, Hard Disk Drive applications) would use one of the phases of the DC motor to measure a back electromotive force (back-EMF) voltage. This measurement would generally cause a discontinuity in the current waveform for a motor operating at a generally constant rotational speed (i.e., at “run speed”), which would result in poor acoustic performance (i.e., audible hum). Here, however, an integrated circuit (IC) is provided that uses coil current and applied voltage measurements to substantially maintain a predetermined phase difference between the phase of the applied voltage and back-EMF voltage, eliminating the need for a back-EMF voltage measurement and improving the acoustic performance. | 07-05-2012 |
| 20120181962 | Method and Device for Monitoring and Correcting a Sensorless Rotor Position Detection in Permanently Excited Motors - The invention relates to methods and devices for monitoring and correcting a sensorless rotor position detection in permanently excited motors, comprising a control device and a current converter. The invention is especially characterised in that the ambiguity of the rotor position determined from the inductance ratios of the motor, in permanently excited motors, can be resolved in a simple manner without a sensor, and a defectively determined angle can be corrected as required. To this end, during the operation of the motor, the rotor position is detected by means of an inductance-based detection device. Furthermore, the rotor position is monitored in relation to the ambiguity of the inductance-based signals by means of a monitoring/correcting device, and where necessary, an occurring angle error corrected, the currents in the motor being modified. | 07-19-2012 |
| 20120194112 | Electrical Brushless Motor - An electrical brushless motor is described, as well as a ceiling fan utilizing the electrical brushless motor. | 08-02-2012 |
| 20120242266 | SENSORLESS BLDC MOTOR SYSTEMS AND DRIVING METHODS OF SENSORLESS BLDC MOTOR - Provided is a sensorless BLDC motor system. The sensorless BLDC motor system includes a BLDC motor, a comparator, a motor controller, a three-phase inverter, and a mode selector. The BLDC motor includes first to third coils. The comparator compares a voltage of a specific coil of the first to third coils with a neutral-point voltage to output the compared result. The voltage of the specific coil becomes equal to the neutral-point voltage and a specific time elapses, and then the motor controller generates first and second coil control signals based on the compared result. The three-phase inverter supplies a source voltage or ground voltage to the specific coil, or floats the specific coil, in response to the first and second coil control signals. The mode selector selects a driving mode of the BLDC motor by adjusting the specific time. | 09-27-2012 |
| 20120249033 | SENSORLESS MOTOR CONTROL - An method for driving a motor is provided. A plurality of pulse width modulation (PWM) signals are generated from a commanded voltage signal and a commanded angle signal, and these PWM signal are used to drive a motor (which has a plurality of phases). Currents through the phases of the motor are measured, and a Park transformation is performed on the measured currents to determine a projection current measurement. Based at least in part on the projection current measurement, the adjusting the commanded voltage signal and the commanded angle signal can be adjusted. | 10-04-2012 |
| 20130069574 | METHOD AND APPARATUS FOR DETERMINING A ZERO CROSSING OF A PHASE CURRENT OF AN ELECTRONICALLY COMMUTATED ELECTRICAL MACHINE, IN PARTICULAR FOR DETERMINING A ROTOR POSITION OF THE ELECTRICAL MACHINE - A method for determining a time for a zero crossing of a phase current in a polyphase electrical machine ( | 03-21-2013 |
| 20130082630 | DETERMINING ROTOR POSITION IN SENSORLESS SWITCHED RELUCTANCE MOTORS - A method for determining the position of a moving rotor in a switched reluctance motor includes the steps of applying a voltage to a phase winding of the reluctance motor, sampling a signal representative of the current magnitude in this phase winding, detecting a feature of the second temporal derivative of the signal, and determining the position of the moving rotor taking into account the occurrence of this feature. Apparatus for carrying out the method is described. | 04-04-2013 |
| 20130193886 | SENSORLESS CONTROL APPARATUSES OF MOTORS AND CONTROL METHODS THEREOF - A sensorless control apparatus of a motor may include: a position estimator configured to compensate for a resistance and a magnetic flux of a permanent magnet of the motor according to a temperature of the motor, and/or configured to generate an estimated speed of a rotor of the motor based on the compensated resistance and the compensated magnetic flux of the permanent magnet; and/or a speed controller configured to generate a command current based on a command speed of the rotor and the estimated speed of the rotor. | 08-01-2013 |
| 20130193887 | MOTOR CONTROL DEVICE - The present invention provides a motor control device including a feedback control system that generates a torque command for reducing a difference between an operation command signal for commanding an operation of a motor and a detection signal of a detector attached to the motor to detect a position and speed of the motor and drives the motor. The motor control device includes a correcting unit configured to estimate an amplitude and a phase of a correction amount for suppressing the detection error included in the detection signal and sequentially update estimation values of the amplitude and the phase and a post-correction-detection-signal calculating unit configured to generate a post-correction detection signal, which is a difference between the detection signal and the correction amount, instead of the detection signal. | 08-01-2013 |
| 20130234639 | SENSORLESS LOST/FOUND ROTOR DETECTION FOR PERMANENT MAGNET MOTORS - Various methods of detecting a found rotor, a lost rotor, a locked rotor and a caught rotor after a power disruption using flux estimates are disclosed. Also disclosed are permanent magnet motor controllers and assemblies suitable for performing one or more of these methods. | 09-12-2013 |
| 20130293171 | Measurement Circuit - A measurement circuit in a motor circuit generates signals for use in a motor control strategy for an electric motor. The measurement circuit comprises a first current sensing means which produces an output signal indicative of the current flowing in a di/dt path connecting the phases of the motor to a ground or a common positive supply voltage, and further comprises a second current sensing means which produces an output signal indicative of the rate of change of current flowing in the ground line, and in which the second current sensing means comprises a Rogowski coil. | 11-07-2013 |
| 20130307452 | MAGNETIC POLE POSITION DETECTING DEVICE FOR DETECTING MAGNETIC POLE POSITION OF ROTOR IN PERMANENT-MAGNET SYNCHRONOUS MOTOR - A magnetic pole position detecting device includes a calculating unit for correcting a magnetic pole position detected by a magnetic pole position detecting unit. In this magnetic pole position detecting device, an additional phase is added to the magnetic pole position detected by the magnetic pole position detecting unit, in order to move a rotor. In relation to a movement amount before and after this movement, a movement amount detected by the magnetic pole position detecting unit is compared with a movement amount detected by an encoder. When a difference between them is larger than a predetermined threshold, a process of detecting the magnetic pole position is determined as false detection. | 11-21-2013 |
| 20130307453 | VARIABLE GAIN AMPLIFIER, CURRENT DETECTING CIRCUIT USING THE SAME, MOTOR DRIVING CIRCUIT AND ELECTRONIC APPARATUS - A variable gain amplifier includes: a first input terminal, a second input terminal and an output terminal; an operational amplifier; a first resistor interposed between the first input terminal and an inverted input terminal of the operational amplifier; second and third resistors interposed between the inverted input terminal and the output terminal; and a fourth variable resistor having a first terminal connected to a node between the second resistor and the third resistor and a second terminal connected to the non-inverted input terminal, wherein the fourth variable resistor includes a resistance pass including a resistor and a switch. | 11-21-2013 |
| 20130314016 | MOTOR CONTROL DEVICE - A motor control device includes feed-forward control means for detecting a change amount of a predetermined monitoring target, which is used for changing the number of revolutions of a motor without depending on revolution number detecting means, and correcting the number of revolutions recognized by a controller. | 11-28-2013 |
| 20140028228 | CONTROL SYSTEMS AND METHODS FOR ANGLE ESTIMATION OF PERMANENT MAGNET MOTORS - An angle estimation control system of a permanent magnet motor is provided. The angle estimation 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 to be approximately equal to zero. The angle signal is further coupled to generate three phase motor voltage signals. | 01-30-2014 |
| 20140049202 | MOTOR CONTROL APPARATUS AND MOTOR CONTROL METHOD - A motor control apparatus according to the embodiment includes a rotational position estimating unit, a change amount estimating unit, and an inductance estimating unit. The rotational position estimating unit estimates a rotational position of a rotor from a motor parameter including a q-axis inductance of a motor on a basis of an output current to the motor and a voltage reference. The change amount estimating unit estimates a change amount of an output torque with respect to a current phase change of the motor corresponding to a high frequency signal whose frequency is higher than a drive frequency of the motor. The inductance estimating unit estimates an inductance value that obtains a maximum torque on a basis of the change amount as the q-axis inductance. | 02-20-2014 |
| 20140049203 | Motor Control Device - The present invention relates to a motor control device provided with the function of detecting the rotor position of a synchronous motor in a sensor-less fashion. The motor control device previously stores a current phase β defined by the two parameters that are an induced voltage peak value Ep and the subtracted value (θe−θi) obtained by subtracting an induced voltage electrical angle θe from a current electrical angle θi, and based on the actual detected Ep, θi, and θe, selects β by referring to the β previously stored, and calculates the rotor position θm by subtracting the selected β from the actual detected θi. Then, in case of selecting β, the actual detected Ep and θe are corrected according to changes in the current flowing through the coil. As a result, a detection accuracy for the rotor position during a transition period is enhanced. | 02-20-2014 |
| 20140055067 | MOTOR DRIVING SYSTEM - A motor driving system is disclosed having a control device | 02-27-2014 |
| 20140070745 | Applied-Voltage Electrical Angle Setting Method For Synchronous Motor, And Motor Control Apparatus - An applied-voltage electrical angle setting method for a synchronous motor includes detecting applied voltage and current of the synchronous motor M, calculating current peak value Ip based on the detected values while calculating present applied voltage phase α, calculating target current phase βtarg based on the current peak value Ip followed by calculating target applied voltage phase αtarg corresponding to the target current phase in a target value setting unit | 03-13-2014 |
| 20140111130 | MOTOR DRIVE DEVICE - A motor drive device is provided which allows control to be performed depending on a position of magnetic poles of a rotor even when a motor rotor angle sensor malfunctions. The device controls a motor for driving a wheel of an electric vehicle, depending on the position of the magnetic poles by using an angle sensed by the angle sensor provided at the motor. The device includes an estimator estimating an angle of a rotor of the motor without using a rotation sensor; a sensor malfunction determiner determining a malfunction of the angle sensor; and a switcher causing control to be performed using a angle estimated by the estimator instead of the angle sensed by the angle sensor once the determiner determines that the angle sensor malfunctions. | 04-24-2014 |
| 20140117900 | Switching Frequency Modulation Utilizing Rotor Position - A control system ( | 05-01-2014 |
| 20140184119 | BRUSHLESS DIRECT CONTACT MOTOR DRIVING DEVICE AND METHOD OF CONTROLLING THE SAME - There is provided a method of controlling a BLDC motor driving device, including aligning a rotor; storing alignment information of the rotor, determining whether the alignment of the rotor is correct or incorrect, and realigning the rotor based on the alignment information. | 07-03-2014 |
| 20140191694 | ELECTRONICALLY COMMUTATED ELECTRIC MOTOR - The invention relates to an electronically commutated electric motor. The electronically commutated electric motor has a power output stage connected to a stator of the electric motor, and a processing unit connected to the power output stage. The processing unit is designed to drive the power output stage to produce at least one stator current. The electric motor has a current sensor which is designed to record the stator current produced by the power output stage and to generate a current signal representing the stator current. The processing unit is designed to use the current sensor to record at least one current value of the current at a recording time within an interval of time and to determine a current profile of the current in the interval of time at least on the basis of the current value and to drive the power output stage to energize the stator on the basis of the current profile determined. | 07-10-2014 |
| 20140217943 | DETERMINING A POSITION OF A MOTOR USING AN ON-CHIP COMPONENT - An embodiment of a motor controller includes first and second supply nodes, a motor-coil node, an isolator, a motor driver, and a motor position signal generator. The isolator is coupled between the first and second supply nodes, and the motor driver is coupled to the second supply node and to the motor-coil node. The motor position signal generator is coupled to the isolator and is operable to generate, in response to the isolator, a motor-position signal that is related to a position of a motor having at least one coil coupled to the motor-coil node. By generating the motor-position signal in response to the isolator, the motor controller or another circuit may determine the at-rest or low-speed position of a motor without using an external coil-current-sense circuit. | 08-07-2014 |
| 20140265968 | Motor Control Loop with Fast Response - A system and method of controlling a motor are disclosed. The system comprises a current observer for observing a motor current at a sampling rate and a proportionate-integral controller that provides a proportionate path and an integral path and at least forms part of a proportionate-integral control loop based on the motor current. The current observer observes a motor current of the motor at a sampling rate. The proportionate path calculates, for a present cycle of the sampling rate, a proportionate path term for the proportionate-integral control loop based on the motor current. The system outputs a respective motor output voltage to the motor in conformity with the proportionate path term calculated for the present cycle. In conformity with the motor current, the integral path calculates an integral path term for another respective motor output voltage to be used in a later cycle of the sampling rate. | 09-18-2014 |
| 20140320052 | CENTRALIZED MOTOR CONTROLLER - A centralized motor controller for receiving commands from an application system controller and for controlling operation of a plurality of independent motors. The centralized motor controller includes: a power supply; a microprocessor; and an interface circuit for motor control including at least two inverter units and two rotor position detection units. The power supply supplies power for each circuit part. The motors are controlled by the microprocessor via the interface circuit for motor control. The number of the motors is equal to or more than three, in which, at least two of the motors are permanent magnet synchronous motors in the absence of a motor controller. The permanent magnet synchronous motors are driven by the microprocessor via the inverter units, respectively. Rotor position data of the permanent magnet synchronous motors are transmitted to the microprocessor via the rotor position detection units, respectively. | 10-30-2014 |
| 20140327380 | CIRCUITS AND METHODS OF DETERMINING POSITION AND VELOCITY OF A ROTOR - A motor controller includes a square wave voltage generator and adding circuitry for adding the square wave voltage to a first drive voltage that is connectable to the stator windings of a motor. A current monitor for monitoring the input current to the motor as a result of the square wave voltage. A device for determining the position of the rotor based on the input current. | 11-06-2014 |
| 20140346990 | METHOD OF DETERMINING THE POSITION AND THE SPEED OF A ROTOR IN A SYNCHRONOUS ELECTRIC MACHINE USING STATE OBSERVERS - The invention is a method of determining the position and the speed of the rotor in a synchronous electric machine using a state observer of the currents of the electric machine and the injection of signals. Thus, the invention provides position information which is accurate, notably at low speed, without using a position detector. The invention also is a control method and system for controlling a synchronous electric machine which accounts for the position determined for the rotor. | 11-27-2014 |
| 20140346991 | METHOD AND SYSTEM OF INTERNAL TEMPERATURES DETERMINATION IN A SYNCHRONOUS ELECTRIC MACHINE USING STATE OBSERVERS - The invention relates to a method of determining internal temperatures ( | 11-27-2014 |
| 20150022131 | ELECTRIC CIRCUIT AND METHOD FOR ESTIMATING THE ANGULAR POSITION OF A ROTOR OF AN ELECTRIC MOTOR, AND DEVICE FOR CONTROLLING AN ELECTRIC MOTOR - Electric circuit for estimating the angular position of a rotor of an electric motor, including: a sensing module configured to receive at least one electric signal representative of a drive current of the electric motor and to generate a measurement signal indicative of a switching of the at least one electric signal and a switching index indicative of the type of switching, rising or falling, of the at least one electric signal; and a computing module configured to supply, from the measurement signal and switching index a position signal representative of an angular position of the electric motor rotor. | 01-22-2015 |
| 20150145454 | MOTOR CONTROL APPARATUS FOR SENSORLESS MOTOR, AND IMAGE FORMING APPARATUS - A motor control apparatus includes: a supply unit configured to supply a current for excitation to a plurality of coils of a motor; a first detection unit configured to detect a physical quantity which varies depending on a change in inductance of at least one of the plurality of coils; a determination unit configured to determine a rotational position of a rotor of the motor based on the physical quantity detected by the first detection unit; and a control unit configured to control the rotational position of the rotor of the motor based on a determination result by the determination unit. | 05-28-2015 |
| 20150349617 | METHOD AND APPARATUS FOR DETERMINING A ROTOR POSITION AND ROTATION SPEED OF AN ELECTRICAL MACHINE - The invention relates to a brush-commutated electrical machine ( | 12-03-2015 |
| 20150365028 | Method for Determining the Rotor Position of a Synchronous Machine Operated in Field-Oriented Manner - A method for determining the rotor position of a synchronous machine operated in field-oriented manner, which has an effective inductivity that is dependent on the rotor position, | 12-17-2015 |
| 20160013747 | MOTOR DRIVING CONTROL APPARATUS AND METHOD, AND MOTOR SYSTEM USING THE SAME | 01-14-2016 |
| 20160028333 | Controller And Method For Transitioning Between Control Angles - A system includes a pulse-width modulation (PWM) module, a subtraction module, an error reducing module, and a summing module. The PWM module controls switching of an inverter that powers a motor. The PWM module controls the switching based on a first angle in a first mode and a second angle in a second mode. The subtraction module determines a difference between the first and second angles. The error reducing module (i) stores the difference when a transition from the first mode to the second mode is commanded and (ii) decreases a magnitude of the stored difference to zero. The summing module calculates a sum of the stored difference and the second angle. The PWM module controls the switching based on the sum in the second mode. | 01-28-2016 |
| 20160036361 | SYSTEM AND METHOD FOR STARTING A MOTOR - A motor controller coupled to a motor is provided. The motor controller is configured to transmit a first instruction to the motor to perform a first start attempt utilizing at least one parameter in a first set of parameters. The motor controller is additionally configured to receive feedback associated with the first start attempt from the motor, and transmit, in response to the feedback, a second instruction to the motor to perform a second start attempt utilizing at least one parameter in a second set of parameters, wherein the second set of parameters differ from the first set of parameters. | 02-04-2016 |
| 20160134214 | DRIVE DEVICE - A drive device that includes an alternating-current rotary electric machine in which currents of a plurality of phases flow; an inverter that includes switching element units for respective phases corresponding to the respective phases, and that is connected between a direct-current power supply and the alternating-current rotary electric machine and performs conversion between a direct current and an alternating current; and shunt resistors that detect currents flowing in the respective switching element units for the corresponding phases between the direct-current power supply and the switching element units for the respective phases | 05-12-2016 |
