Class / Patent application number | Description | Number of patent applications / Date published |
318400230 | Torque ripple stabilization or acoustic noise attenuation (e.g., cogging prevention, etc.) | 76 |
20080315809 | MOTOR CONTROLLER AND ELECTRIC POWER STEERING APPARATUS - The micro computer | 12-25-2008 |
20080315810 | MOTOR CONTROL APPARATUS AND MOTOR CONTROL METHOD - The motor control apparatus includes a memory that stores a correction data group for suppressing a fluctuation of an output of a motor, and a calculating unit that generates, by using a correction value calculated on the basis of a first output command value input thereto and the correction data group, a second output command value for controlling the output of the motor, the correction value being in accordance with operation position information of the motor. The memory stores plural correction data groups corresponding to predetermined output command values for different torque levels. The calculating unit calculates the correction value in accordance with the first output command value and the operation position information of the motor by interpolation processing using correction data included in at least two correction data groups among the plural correction data groups. The apparatus suppresses the output fluctuation of the motor. | 12-25-2008 |
20090128073 | Brushless Motor Control Method and Brushless Motor - In a brushless motor for an electric power steering device having a configuration of 2 poles and 3 slots, or of an integral multiple thereof, a stator coil is supplied with current containing a higher harmonic component. A difference of 0.5% to 1.5% is provided between the higher harmonic component content rate of the stator coil current and the higher harmonic component content rate of the induced electromotive force generated in the stator coil with rotation of a permanent magnet, thereby mitigating the influence by an armature reaction generated in the induced electromotive force to reduce torque ripples. The difference between the higher harmonic component content rates is set on the basis of a change that occurs in the induced electromotive force due to the armature reaction at a time of supplying electricity to the armature coil. | 05-21-2009 |
20090140678 | TORQUE RIPPLE SUPPRESSOR OF ENGINE - A torque ripple suppressor ( | 06-04-2009 |
20090167224 | Motor Control Device and Motor-Driven Power Steering System Using the Same - An object of the present invention is to provide a motor control device capable of suppressing voltage composite vector fluctuation to increase the output of a brushless motor, and a motor-driven power steering system using this device. The present control device calculates motor phase current command values based on a target current and a rotor rotational position detection value, calculates voltage command values based on the motor phase current command values and phase current detection values, and supplies phase currents to a three-phase brushless motor based on the voltage command values. The present control device outputs the phase current command values so that the absolute value of a composite vector of respective phase drive voltages is substantially a value √3/2 times the power supply voltage. | 07-02-2009 |
20090251086 | MOTOR CONTROL UNIT - A motor control unit ( | 10-08-2009 |
20090251087 | MOTOR CONTROLLER - A motor controller supplies power to a motor and drives the motor, the motor including a position detector. The motor controller includes a velocity control unit which generates a torque instruction by using a velocity instruction and a velocity signal; a correction processing unit which Fourier-transforms the torque instruction, extracts first-, second-, and sixth-order frequency components from the Fourier-transformed torque instruction, extracts an order component having the largest spectrum from the extracted order components, and generates a sine wave correction signal; an adder which adds the sine wave correction signal to the torque instruction, and generates a new torque instruction; and a position-signal generation unit which generates a position signal by using a position detection signal of the position detector. | 10-08-2009 |
20090322268 | ELECTRIC POWER STEERING APPARATUS - There is provided a three-phase brushless motor | 12-31-2009 |
20100019709 | METHOD FOR CONTROLLING THE ELECTRIC MOTOR OF A HYBRID OR ELECTRIC VEHICLE - The invention relates to a method for controlling the electric motor of a hybrid or electric vehicle. The method is intended for controlling the electric motor driving the transmission shaft of a vehicle, wherein the motor applies to the transmission shaft a torque having a value corresponding to a torque set-point applied to said electric motor. The torque set-point is corrected by subtracting a correction signal obtained by the application of a band-pass filtration-type processing to a signal representative of the transmission-shaft rotational instant speed, within a frequency band including the frequency of a particular oscillation mode of the vehicle traction chain. The invention can be used for reducing jolts resulting from a discontinuity in the torque applied to the transmission shaft. | 01-28-2010 |
20100134058 | METHOD AND SYSTEM FOR CREATING A VIBRATION IN AN AUTOMOBILE - A method and system for operating an automotive electric motor having first and second components is provided. A desired frequency of vibration for the electric motor is selected. A current is caused to flow through at least one of the first and second components such that the second component moves relative to the first component. The current is modulated such that the motor vibrates at the desired frequency. | 06-03-2010 |
20100156332 | COMPENSATING SYSTEM AND METHOD FOR COGGING TORQUE OF MOTOR - A compensating system for compensating a cogging torque of a motor includes a speed measuring apparatus, a moment of inertia measuring apparatus, a rotor position sensor, a processor, a plurality of band-pass filters, and a current control apparatus. The processor receives a speed, a moment of inertia, and a rotor position of the motor, to determine the cogging torque of the motor. Each band-pass filter is arranged with a different frequency to filter different frequencies of waveforms of the cogging torque. The processor determines a Fourier transformation of the cogging torque according to a number of Fourier coefficients from the band-pass filters, a cogging torque at a preset rotor position, and a cogging current according to the Fourier transformation of the cogging torque. The current control apparatus outputs a current opposite to the cogging current, to compensate the cogging torque of the motor. | 06-24-2010 |
20100164417 | APPARATUS MOTOR CONTROL METHOD - A method for controlling a motor can suppress an influence of speed variation due to cogging of the motor. The method includes performing a preliminary drive process to output a first driving signal to the motor to move the mechanism, performing the preliminary drive process to output a second driving signal corresponding to a cogging period of the motor to the motor as well as output the first driving signal, to move the mechanism, determining parameters which include an output waveform and output timing of the second driving signal based on a speed of the mechanism in the preliminary drive process, and outputting the second driving signal according to the determined parameters to the motor as well as outputting the first driving signal to the motor in an actual drive process to perform predetermined processing by moving the mechanism. | 07-01-2010 |
20100194320 | Motor control apparatus and motor control method - In a polyphase electric motor, a voltage is sequentially applied to a plurality of windings on a phase-by-phase basis. Then, there is sensed a rotational speed of a rotor, which is rotated by a rotating magnetic field that is generated by sequentially flowing an electric current in the windings on the phase-by-phase basis upon the sequential application of the voltage to the windings. Then, an oscillation frequency of a periodic oscillation, which is generated in the motor at the sensed rotational speed of the rotor, is obtained. Thereafter, it is determined whether the obtained oscillation frequency is a predetermined resonance frequency. Next, the voltage to be applied to the windings is corrected in a manner that reduces a resonance generated in the motor when a result of the determination indicates that the obtained oscillation frequency is the predetermined resonance frequency. | 08-05-2010 |
20100207559 | ROTARY ELECTRIC MACHINE CONTROL APPARATUS - It is possible to suppress vibration of a rotary machine in a rotary machine control apparatus. A drive control system of a fuel cell vehicle having a rotary machine includes a control unit having: a drive permission power calculation module which calculates the rotary machine drive permission power according to the states of a fuel cell and an accumulator as power sources of the rotary machine: a limit torque calculation module which calculates a limit torque of the rotary machine according to the drive permission power; and a filter processing module which performs a low-pass process on the limit torque calculation. A storage device of the control unit stores a filter processing region map indicating the region where the filter process is executed by correlating the region with the drive permission power and the rpm. | 08-19-2010 |
20100244755 | Rotary electric machine control device - A rotary electric machine control device includes a positive/negative determination section that determines whether an output torque of the rotary electric machine is positive or negative; a correction parameter setting section that sets as a correction parameter a phase difference of a sinusoidal ripple correction wave for reducing torque ripple of the rotary electric machine with respect to a magnetic pole position of the rotary electric machine depending on whether the output torque is positive or negative; and a correction wave generation section that generates the ripple correction wave on the basis of the correction parameter. | 09-30-2010 |
20100270956 | Quiet Motor Control System - A quiet motor control system is described. This system digitally determines modulated voltages applied to motor phases in a manner that compensates for winding torque distortions, which reduces acoustic emissions. | 10-28-2010 |
20100301789 | CONTROL OF ELECTRICAL MACHINES - This invention relates to the control of electrical machines and is concerned more particularly, though not exclusively, with the control of flux switching brushless permanent magnet and switched reluctance electrical machines without a mechanical shaft position sensor. Brushless Reluctance and permanent magnet motors can be used in many applications, since they do not require the use of commutators or brushes in supplying electrical power to the rotor of the motor. An electrical machine is provided for converting electrical energy into mechanical energy and/or mechanical energy into electrical energy, the machine comprising a stator and a rotor, the stator having one or more electrical windings wherein at least one electrical parameter of the windings have a cyclic variation related to rotor position; at least one control device for controlling supply of electrical current to or from the or each said electrical winding, and at least one rotor position sensor means for detecting at least one electrical signal related to the cyclic variation of at least one electrical parameter of the or each said electrical winding wherein at least one said rotor position sensor means comprises the steps of measuring the said electrical signal at least once during any part of a switching cycle, conversion of the at least one measured electrical signal to a ratiometric quantity representative of an estimate of the rotor position corresponding to the at least one measured electrical signal and using the said ratiometric quantity in a calculation to maintain the current passing through the or each said electrical winding in synchronism with rotor rotation. | 12-02-2010 |
20110057591 | SYNCHRONOUS ELECTRIC MOTOR DRIVE SYSTEM - The present invention provides a synchronous motor drive system designed to realize reduced vibration and noise along with high output. The system includes: inverters | 03-10-2011 |
20110074324 | Control Device for Synchronous Motor - A control technology for a synchronous motor for suppressing rotational pulsation caused by variation in individuals without making a control algorithm complex is provided. In a motor drive system which is a control device for a synchronous motor, in order to suppress the pulsation component of N times as high as the AC frequency for driving the synchronous motor, a controller in which the phase property of the disturbance response of the controller with respect to the pulsation frequency is within ±45° is arranged. Therefore, the torque pulsation component generated from distortion in induction voltage or variation between phases is suppressed. | 03-31-2011 |
20110084636 | METHOD FOR REDUCING COGGING TORQUE EFFECTS OF AN ELECTRICAL PERMANENT MAGNET MACHINE - A method for reducing cogging torque effects of an electrical permanent magnet machine includes running an “a” test and a “b” test with different cogging compensation signals. A first value is calculated by multiplying a complex cogging amplitude of the compensation signal applied for the “a” test with a complex amplitude of a vibration signal resulting from cogging torque of the “b” test. A second value is calculated by multiplying a complex cogging amplitude of the compensation signal applied for the “b” test with a complex amplitude of the vibration signal resulting from cogging torque of the “a” test. A desired complex cogging compensation amplitude is calculated by dividing the difference between the first and second values by a difference between the complex amplitudes of the vibration signals resulting from the “b” test and the “a” test. A cogging compensation torque is applied to the machine based on the desired complex cogging compensation amplitude. | 04-14-2011 |
20110204833 | CONTROLLER FOR MOTOR - A controller for use with a motor including a stator, around which three-phase coils are wound, and a rotor, which includes a magnet functioning as a first magnetic pole and a salient pole of a core functioning as a second magnetic pole. The controller supplies the three-phase coils with excitation currents having a predetermined phase difference from one another to drive and rotate the rotor. The controller includes a current adjustment unit that adjusts a fundamental wave current using high-order currents for third order and ninth order components in a q-axis to reduce torque ripple. The excitation current is generated based on the fundamental wave current adjusted by the current adjustment unit. | 08-25-2011 |
20110215745 | Vibration and Noise Control Strategy in Electrical Machines - An electrical machine device is disclosed, the electrical machine device including an electrical machine and a converter electrically coupled to the electrical machine. A configuration of the electrical machine generates a first vibration component in the electrical machine and the converter generates a second vibration component in the electrical machine. The electrical machine and the converter are adapted to each other such that the first vibration component and the second vibration component at least partially interfere destructively. Further, respective methods and computer programs for controlling a converter or operating a converter are disclosed. | 09-08-2011 |
20110241586 | CONTROL APPARATUS FOR PERMANENT MAGNET MOTOR - A sinusoidal signal is superimposed on a current command value of a q-axis (torque shaft) supplied from a host, and according to the resulting current command value, the output voltage of a power converter is controlled. For the calculation of the superimposed signal added to the current command value of the q-axis, with the use of the ripple component information of induced voltage coefficients of the d-axis and q-axis of the rotating coordinate system of a permanent magnet motor, the current command values of the d-axis and q-axis, an average value of induced voltage coefficients of the d-axis, and inductance values of the d-axis and q-axis, the sinusoidal superimposed signal is calculated and added to the above-described current command value of the q-axis. | 10-06-2011 |
20110291601 | CONTROL APPARATUS FOR ELECTRIC ROTATING MACHINE - A controller outputting a voltage instruction for drive control to a electric rotating machine includes a drive voltage instruction calculation section calculating drive voltage instructions for driving the electric rotating machine, a position estimation voltage generator generating position estimation voltage instructions for position estimation about the electric rotating machine, a noise reduction voltage generator generating noise reduction voltage instructions for reducing noise occurring from the electric rotating machine along with input of the position estimation voltage instructions to the electric rotating machine, and adders outputting, to a voltage application means, a voltage instruction obtained by adding the position estimation voltage instructions and the noise reduction voltage instructions to the drive voltage instructions. | 12-01-2011 |
20110298405 | METHOD OF CONTROLLING A THREE-PHASE PERMANENT MAGNET SYNCHRONOUS MOTOR FOR REDUCING ACOUSTIC NOISE AND RELATIVE CONTROL DEVICE - A method of controlling a synchronous motor that may include windings and a power driving stage coupled to the windings, may include using a feedback loop including using a feedback circuit coupled to the windings to generate current feedback components, using current controllers for generating respective voltage signals, and using an anti-transform circuit for generating control signals for the power driving stage. Using the feedback loop may include generating additional compensation signals for compensating the control signals, and adding the additional compensation signals from the current controllers by one of generating the additional compensation signals as quadrature and direct voltage compensation signals and adding them to the voltage signals to generate compensated quadrature and direct signals, and supplying the compensated quadrature and direct signals to the power driving stage by providing the compensated quadrature and direct signals to the anti-transform circuit. | 12-08-2011 |
20120001576 | APPARATUS INCLUDING MOTOR - To suppress torque variation including various frequency components, a lot of measuring and adjusting operations are necessary, and this takes much time and trouble. An electronic apparatus includes a selection unit configured to select, on the basis of a threshold value relating to speed variation of the mechanism and threshold values relating to a plurality of frequencies that constitute the speed variation, a frequency to be measured and a frequency to be suppressed, from the plurality of frequencies, a generation unit configured to generate a periodic signal including the frequency to be suppressed that is selected by the selection unit, and an acquisition unit configured to output the periodic signal generated by the generation unit to the control unit and to acquire a parameter relating to the frequency included in the periodic signal. | 01-05-2012 |
20120019182 | MAGNETIC-DRIVE-PULSATION MOTOR - To develop a motor which can directly drive a brushless motor using a conventional circuit for an inverter without smoothing circuit and a circuit for a matrix converter that are for a brushed motor that operates on single-phase 100 V. Magnetic cores are attached to a motor shaft to increase inertial force. A magnetic-drive-pulsation motor which modulates torque is realized using force of attraction and repulsion generated by outer magnets and magnetic cores. The magnetic-drive-pulsation motor can be driven using the inverter and the matrix converter on single-phase 100 V power supply. | 01-26-2012 |
20120038301 | Polyphase AC Motor, Driving Device and Driving Method Therefor - Provided is an AC motor in a three-phase unbalanced state such as a claw-teeth type AC motor ( | 02-16-2012 |
20120081051 | CONTROL DEVICE - A control device configured with an external input estimator that reduces a vibration component of a rotational speed of the power transfer system at a rotational speed of the rotary electric machine and estimates transfer system input torque on the basis of the rotational speed of the rotary electric machine, and that estimates external input torque by subtracting at least output torque of the rotary electric machine from the transfer system input torque. A low-vibration speed calculator calculates a low-vibration rotational speed on the basis of the external input torque and vehicle required torque. A rotational speed controller calculates feedback command torque that matches the rotational speed of the rotary electric machine with the low-vibration rotational speed. A torque command value calculator calculates an output torque command value on the basis of the vehicle required torque and the feedback command torque. | 04-05-2012 |
20120091934 | METHOD FOR DAMPING ELECTROMECHANICAL OSCILLATIONS IN AN ELECTROMECHANICAL SYSTEM AND OSCILLATION DAMPING SYSTEM FOR EMPLOYING SUCH METHOD - A method is provided for damping electromechanical oscillations in an electromechanical system including at least one electric machine operable with an angular speed and a phase of the angular speed being coupled to at least one torque load and producing an electromotive force. The method includes deriving actual values of the electromotive force and adjusting the phase of the angular speed, based on the derived actual values of the electromotive force, in a direction in which an oscillatory behavior of the electric machine is reduced. | 04-19-2012 |
20120235612 | MOTOR CONTROL DEVICE FOR VEHICLE - The motor control device includes: a vehicle control device ( | 09-20-2012 |
20120249030 | APPARATUS MOTOR CONTROL METHOD - A method for controlling a motor can suppress an influence of speed variation due to cogging of the motor. The method includes performing a preliminary drive process to output a first driving signal to the motor to move the mechanism, performing the preliminary drive process to output a second driving signal corresponding to a cogging period of the motor to the motor as well as output the first driving signal, to move the mechanism, determining parameters which include an output waveform and output timing of the second driving signal based on a speed of the mechanism in the preliminary drive process, and outputting the second driving signal according to the determined parameters to the motor as well as outputting the first driving signal to the motor in an actual drive process to perform predetermined processing by moving the mechanism. | 10-04-2012 |
20120268048 | CONTROL SYSTEM FOR ELECTRIC MOTOR APPLIED TO CYCLIC LOADS AND CONTROL METHOD FOR ELECTRIC MOTOR APPLIED TO CYCLIC LOADS - The present application refers to a system and a control method especially applied to electric motors designed to drive cyclical loads. The present system includes an electric motor ( | 10-25-2012 |
20120274250 | ANTICIPATORY CONTROL SYSTEM FOR ELECTRIC MOTOR AND ANTICIPATORY CONTROL METHOD FOR ELECTRIC MOTOR APPLIED TO CYCLIC LOADS - The present application relates to an anticipatory control system and method for electric motor applied to cyclic loads, said system including an electric motor ( | 11-01-2012 |
20120306415 | CONVERTER CONTROL DEVICE FOR VEHICLE - A boost control section for controlling a converter includes a PI control section and a resonance suppression section. The PI control section calculates a basic command value based on a deviation between a drive voltage generated by the converter and a target voltage to equalize the drive voltage and the target voltage. The resonance suppression section calculates, based on the state of variation of the drive voltage, a correction value for correcting the basic command value to suppress the variation. The basic command value is corrected by adding the correction value. First and second drive pulses corresponding to the corrected command value are outputted to the converter. | 12-06-2012 |
20130009579 | Control of Electrical Machines - In an electrical machine which has time-varying or position-varying disturbances in its output, signals representing the position and values of machine-related parameters are used to solve a model of the machine to calculate the phase currents which are required to minimise the disturbances. The model is able to provide solutions in the presence of limitations of some of the operating conditions of the machine, for example the supply voltage or the error in the signal representing the position. | 01-10-2013 |
20130020973 | MOTOR DRIVING CIRCUIT AND MOTOR DRIVING SYSTEM - A motor driving circuit controls driving of a motor based on communications with an external MCU. The motor driving circuit has a first port that receives a first digital signal outputted from the MCU. The motor driving circuit has a duty measuring circuit that measures a duty of the first digital signal inputted through the first port and outputs a duty information signal corresponding to the measured duty. The motor driving circuit has a frequency measuring circuit that measures a frequency of the first digital signal and outputs a frequency information signal corresponding to the measured frequency of the first digital signal. | 01-24-2013 |
20130082629 | MOTOR DRIVING DEVICE - Provided is a motor driving device. The motor driving device includes a drive signal generating unit, a current control unit, and a driving unit. The drive signal generating unit generates a motor drive signal for driving a motor. The current control unit is disposed at a front of the drive signal generating unit and controls a current of the drive signal generating unit so as to prevent noise and vibration of a motor caused by electromagnetic interference generated when a switch of the drive signal generating unit is turned on/off. The driving unit drives the motor based on the motor drive signal outputted from the drive signal generating unit. | 04-04-2013 |
20130099706 | Motor Control Circuit And Method That Synchronize A Speed Of An Electric Motor To An External Clock Signal - Motor control circuits and associated methods to control an electric motor provide an ability to synchronize a rotational speed of the electric motor with an external clock signal, resulting in reduced jitter in the rotational speed of the electric motor. | 04-25-2013 |
20130099707 | BRUSHLESS MOTOR CONTROL METHOD, BRUSHLESS MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING APPARATUS - A control device ( | 04-25-2013 |
20130106332 | Current Sensor Error Compensation | 05-02-2013 |
20130134916 | CONTROLLING AN ELECTRICAL CONSUMER OF AN AIRCRAFT - An electrical consumer of an aircraft comprises an electric motor and an inverter for producing an alternating voltage for the electric motor. A method for controlling the electrical consumer comprises determining a rotational frequency for the electric motor. The method also includes establishing whether the rotational frequency leads to oscillations in the input current of the inverter which are below a predefined threshold, the oscillations being produced by the inverter when producing a supply voltage for the electric motor, and changing the rotational frequency if it has been established that the rotational frequency leads to oscillations below the predefined threshold. | 05-30-2013 |
20130141027 | MOTOR DRIVE SYSTEM AND CONTROL METHOD THEREOF - A motor drive system comprising: an inverter that supplies power to a three-phase motor; and a control unit that controls switching elements of upper and lower arms included in the inverter by switching between supply control of controlling the switching elements so that alternating current is supplied to three phases of the three-phase motor and suspension control of controlling the switching elements so that the supply of current is stopped. The suspension control involves: putting and keeping, in a conduction state, a switching element of at least one upper arm each corresponding to one of one or more phases through which current flows in a direction entering the three-phase motor at a timing at which the supply of current is stopped, and putting and keeping switching elements of rest of the upper arms and switching elements of lower arms in a non-conduction state. | 06-06-2013 |
20130147408 | MOTOR CURRENT PHASE DETECTING DEVICE AND MOTOR DRIVE DEVICE HAVING SAME - The present invention is directed to a motor current phase detecting device that drives a motor having a three-phase drive coil, the device including a power distributor that supplies a drive voltage and a drive current to the drive coil, a current detector that detects a common current waveform flowing from the power distributor, a position detector that detects a position of a rotor, a waveform generator that generates a first PWM signal, a waveform regulator that generates a second PWM signal based on the first PWM signal, and a current phase detector that detects a phase of a drive current flowing in each of the drive coil. The waveform regulator generates the second PWM signal that operates a current phase detector while maintaining a relative voltage value between the drive coils determined by the first PWM signal, and the current phase detector detects the phase of the drive current of the drive coil by detecting a peak current value of the drive coil included in the common current waveform based on the second PWM signal. | 06-13-2013 |
20130162186 | SENSORLESS TORSIONAL MODE DAMPING SYSTEM AND METHOD - A torsional mode damping controller system is connected to a converter that drives an electrical machine mechanically connected to a train. The controller system includes an input interface configured to receive measured data related to variables of the converter or the electrical machine, and a controller connected to the input interface. The controller calculates at least one dynamic torque component along a section of a shaft of the train based on the data from the input interface, generates control data for the converter for damping a torsional oscillation in the mechanical drive train based on the at least one dynamic torque component, and sends the control data to the converter for modulating an active power exchanged between the converter and the electrical machine. | 06-27-2013 |
20130175957 | SINGLE-PHASE BRUSHLESS MOTOR - A single-phase brushless motor includes a plurality of coils configured to be driven with a single phase, a sensor which detects a magnetic pole change according to the rotation of a rotor, and an energization mechanism which drives the rotor at a predetermined rotational speed. The energization mechanism is arranged to switch between a rectangular wave energization in which a voltage applied to the coil represents a rectangular waveform and a pseudo-sine wave energization in which the applied voltage represents a waveform of a pseudo-sine wave. The switching between the rectangular wave energization and the pseudo-sine wave energization is performed by gradually changing the waveform. | 07-11-2013 |
20130200828 | PWM Frequency Pattern Optimization for NVH - An optimized pseudo-random period pattern can reduce audible noise in a system that includes an inverter circuit configured to provide power to an electric machine. A system can include a PWM optimization module (POM) comprising the PPP. A carrier period for a carrier signal used to provide PWM inverter drive signals can be selected in accordance with the PPP. The PPP can be expressed as an array of 200-400 elements, each element a period belonging to a finite set of 2 or more predetermined periods. A period can be selected by index from the array, and the index incremented to progress through the PPP, which can be repeated upon its completion. The PPP can be optimized to reduce audible noise while mitigating inverter losses. Modeling techniques can determine the number of array elements, the number of possible periods, and the period values that optimize the PPP. | 08-08-2013 |
20130221887 | METHOD AND APPARATUS FOR HIGH VELOCITY RIPPLE SUPPRESSION OF BRUSHLESS DC MOTORS HAVING LIMITED DRIVE/AMPLIFIER BANDWIDTH - A method and apparatus are provided for ripple suppression of brushless DC motors at any given velocity irrespective of the limited bandwidth of the driver/amplifier supplying the excitation currents to the stator. In a preferred embodiment, Fourier coefficients of the current waveform are calculated as a function of rotor velocity by taking into account the driver/amplifier's finite bandwidth dynamics. For a given velocity, Fourier coefficients of the series approximating the waveform (control signal) are calculated as a function of the rotor velocity and the amplifier dynamics, to generate a waveform that results in no torque or velocity pulsations. When changing the motor speed, the coefficients are updated (recalculated) based on the new desired velocity (and amplifier dynamics), resulting in generation of an updated waveform that results in no torque or velocity pulsations at the new motor speed. | 08-29-2013 |
20130241453 | QUIET MOTOR CONTROL SYSTEM - A quiet motor control system is described. This system digitally determines modulated voltages applied to motor phases in a manner that compensates for winding torque distortions, which reduces acoustic emissions. | 09-19-2013 |
20130249457 | METHODS, SYSTEMS AND APPARATUS FOR GENERATING VOLTAGE COMMAND SIGNALS FOR CONTROLLING OPERATION OF AN ELECTRIC MACHINE - Embodiments of the present disclosure relate to methods, systems and apparatus for generating voltage command signals for controlling operation of an electric machine. The disclosed embodiments can reduce current and torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source. | 09-26-2013 |
20130278192 | CONTROL APPARATUS REDUCING NOISE COMING FROM ROTARY ELECTRIC MACHINE - A control apparatus for a rotary electric machine includes: operating unit for operating a DC-AC conversion circuit including a switching element so as to control a controlled variable of the rotary electric machine, the switching element selectively connects positive and negative terminals of a DC power source to respective terminals of the rotary electric machine and conduction period setting unit, in response to a rotational speed of the rotary electric machine, for setting a conduction period during which the respective terminals of the rotary electric machine, and the positive and negative terminals of the DC power source are allowed to be electrically connected therebetween via the switching element. The conduction period setting unit set the conduction period as a manipulated variable so as to reduce electromagnetic force distortion at a frequency corresponding to a resonant frequency of the rotary electric machine. | 10-24-2013 |
20130300327 | POWER CONVERSION APPARATUS - A DC link is provided, which includes a capacitor connected in parallel to an output of a converter circuit, and outputs a pulsating DC link voltage. An inverter circuit is provided, which converts an output of the DC link to AC by switching, and supplies the AC to a motor connected thereto. A controller is provided, which controls switching of the inverter circuit so that motor currents pulsate in synchronization with pulsation of a power-supply voltage. The controller controls the switching of the inverter circuit in accordance with a load of the motor or an operational state of the motor, and reduces pulsation amplitude of the motor currents. | 11-14-2013 |
20130314015 | CONTROL APPARATUS FOR ELECTRIC POWER STEERING APPARATUS | 11-28-2013 |
20140001991 | CONTROL DEVICE FOR ROTATING ELECTRICAL MACHINE | 01-02-2014 |
20140021894 | TORQUE RIPPLE REDUCTION OF MULTIPLE HARMONIC COMPONENTS - An electric motor system includes a motor configured to produce a torque signal in response to a torque command. The torque signal has a fundamental frequency component, a first ripple harmonic and a second ripple harmonic. The first ripple harmonic is an integer multiple of the fundamental frequency component. The second ripple harmonic is an integer multiple of the first ripple harmonic. A system and method is provided to generate a ripple reduction signal in response to the torque command that simultaneously cancels the first and the second ripple harmonic in the torque signal. The second ripple harmonic may be canceled with the first ripple harmonic by being projected onto the first ripple harmonic through a transformation matrix. | 01-23-2014 |
20140049201 | Motor Control Device - Proposed is a motor control device that executes rotational control that follows load fluctuations in a startup mode. The proposed motor control device is provided with: detection means | 02-20-2014 |
20140084829 | INVERTER CONTROLLING SYSTEM AND METHOD FOR REDUCING NOISE IN ECO-FRIENDLY VEHICLE - Disclosed is a system and method of controlling an inverter to reduce noise in an eco-friendly vehicle. In the method, at least one of a current motor torque and a current motor speed is monitored in real-time. It is determined whether or not the at least one of the current motor torque and the current motor speed corresponds to a noise occurrence range set to a current switching frequency. A changed switching frequency value corresponding to the at least one of the current motor torque and the current motor speed is calculated when the at least one of the current motor torque and the current motor speed corresponds to the noise occurrence range. A PWM signal is generated using the changed switching frequency value to control an inverter. | 03-27-2014 |
20140103844 | CONTROL DEVICE OF AC MOTOR - A control device for controlling an AC motor with an inverter includes: a current acquisition device of a sensor phase current sensed value of the motor in a sensor phase current sensing cycle; a rotation angle acquisition device of a rotation angle sensed value of the motor; a current command value operation device for updating a current command value in a command update cycle; a current estimation device; a voltage command value operation device; a drive signal generation device; and a sudden change prevention device for preventing the voltage command value from a sudden change according to a sudden change in the current estimated value. The sudden change of the current estimated value is caused by a sudden change in the current command value. | 04-17-2014 |
20140125264 | CONTROL SYSTEM FOR AC ELECTRIC MOTOR - Fluctuations in output of an AC electric motor are restrained without increasing electromagnetic noise of a boost converter. When subjecting the AC electric motor to rectangular wave voltage control, output torque T is controlled by varying a voltage phase φv. In a region where a voltage phase is large (φv=θ2), fluctuations in torque T relative to changes in a DC voltage VH corresponding to the amplitude of a rectangular wave voltage are larger than in a region where the voltage phase is small (φv=θ1). The AC electric motor is controlled such that the rectangular wave voltage control in a region where voltage phase φv is larger than a limit-phase line PLN indicated by a set of limit phases set for each DC voltage VH is avoided. | 05-08-2014 |
20140159629 | MOTOR DRIVING CONTROL APPARATUS AND METHOD, AND MOTOR USING THE SAME - There are provided a motor driving control apparatus and method, and a motor using the same, the motor driving apparatus including a driving signal generating unit generating a driving control signal for controlling the driving of a motor apparatus, a speed detecting unit detecting a rotation speed of the motor apparatus, and a frequency determining unit controlling the driving signal generating unit to vary a frequency of the driving control signal according to the rotation speed. | 06-12-2014 |
20140167666 | Systems and Methods for Reduction of Motor Jitter While Driving an Electric Motor - An apparatus for driving a motor comprises a drive signal generation circuit configured to produce pulses on a pulse-width modulated drive signal in response to a control signal. A detection circuit is coupled to receive a commutation signal from the motor to monitor the speed of the motor. A control signal generation circuit is configured to dynamically generate the control signal so that a frequency of pulse-width modulated drive signal corresponds with the duration of the phase of the motor, so as to reduce the occurrence of an incomplete pulse on the drive signal. Methods for driving a motor are also disclosed. | 06-19-2014 |
20140203744 | MACHINE HAVING A CONVERTER CONTROLLED DRIVE - A with a converter controlled drive includes a rotor, a drive having a variable rotational frequency a working machine and a frequency converter. The drive and the working machine are connected to one another such that a torque is transmitted. The frequency converter is electrically connected to the drive and converts input frequencies to output frequencies. The output frequencies are grouped into a plurality of concentration ranges based upon a rotational speed of the machine. Each concentration range defines a blocking range. The machine has an operating rotational speed range which lies outside the blocking ranges. | 07-24-2014 |
20140217938 | MOTOR CONTROLLER WITH DRIVE-SIGNAL CONDITIONING - An embodiment of a motor controller includes a motor driver and a signal conditioner. The motor driver is operable to generate a motor-coil drive signal having a first component at a first frequency, and the signal conditioner is coupled to the motor driver and is operable to alter the first component. For example, if the first component of the motor-coil drive signal causes the motor to audibly vibrate (e.g., “whine”), then the signal conditioner may alter the amplitude or phase of the first component to reduce the vibration noise to below a threshold level. | 08-07-2014 |
20140246999 | MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE - There is provided a motor control device for controlling a motor including plural sets of windings, which is configured so that, when a fault detection means detects a fault, inverters in the normal side other than in the fault side are continued to be controlled by normal-time current control means and further, inverters in the fault side are continued to be controlled by fault-time voltage commands generated by a fault-time current control means configured with a fault-time normal-side command generator and a fault-time fault-side command generator, so as to emphasis a torque ripple of the motor when a winding fault of the motor or an inverter fault occurs, to thereby cause a user to surely recognize the fault. | 09-04-2014 |
20140265961 | MOTOR CONTROL SYSTEM TO COMPENSATE FOR TORQUE RIPPLE - A motor control system is provided. The motor control system includes a motor having plurality of motor harmonics, and a torque ripple compensation controller in communication with the motor. The torque ripple compensation controller is configured to determine a harmonic ripple current for a corresponding one of the plurality of motor harmonics. The harmonic ripple current is based on a reference q-axis current and a reference d-axis current. The torque ripple compensation controller is configured to add the harmonic ripple current for each of the plurality of motor harmonics together to determine the ripple compensating current. | 09-18-2014 |
20140265962 | MOTOR CONTROL SYSTEM HAVING BANDWITH COMPENSATION - A motor control system for determining a ripple compensating current is provided. The motor control system includes a motor having a plurality of motor harmonics and a motor frequency, and a bandwidth compensation controller that is in communication with the motor. The bandwidth compensation controller is configured to determine a magnitude response compensation value and a phase compensation value for each of the plurality of motor harmonics. The magnitude response compensation value and the phase compensation value are both based on the motor frequency. The bandwidth compensation controller is configured to determine the ripple compensating current based on the magnitude response compensation value and the phase compensation value. | 09-18-2014 |
20140265963 | METHOD OF CONTROLLING START-UP NOISE IN BLDC (BRUSHLESS DIRECT CURRENT) FAN MOTORS - A method to reduce acoustic noise in a cooling fan motor is disclosed. The method includes reducing the slew rate of a PWM (pulse width modulation) voltage waveform applied to energize a coil of the fan motor. This slew rate reduction results in lower mechanical vibrations and acoustic noise in the fan motor. In one embodiment, the slew rate reduction is performed during startup of the fan motor, when the motor is spinning slowly and there is little air flow noise. In another embodiment, the slew rate reduction is not performed during high speed operation of the fan motor, when the fan motor is spinning very fast and air flow noise masks the motor noise. In one embodiment, there is variable slew rate control depending on the speed of the fan motor. | 09-18-2014 |
20140375239 | MOTOR CONTROL SYSTEM AND METHOD FOR ENVIRONMENTALLY-FRIENDLY VEHICLE - A motor control system and method are provided for a vehicle that reduces torque ripples due to motor system characteristics while the vehicle is running at ultra-low speed in an electric vehicle running mode. The system includes a current command generator that generates a current command based on a torque command, a motor speed, and a reference voltage. A current controller generates a voltage command based on the current command. A coordinate transformer transforms the voltage command into a 3-phase voltage command by a coordinate transformation and a PWM (pulse width modulation) signal generator generates a switch signal based on the 3-phase voltage command. A PWM inverter generates a 3-phase driving current to drive a motor based on the switch signal and a current control ripple compensator applies a reverse phase harmonic wave to the current controller to reduce a harmonic wave caused by errors generated from the current controller. | 12-25-2014 |
20150054440 | METHOD FOR MAKING A MOTOR QUIETER - The method is for making a brushless direct-current (DC) motor quieter. A predetermined high frequency pulse width modulated (PWM) signal is generated. The PWM signal is sent to a first filter. The first filter truncates the PWM signal to provide the PWM signal with a rise time. The rise time allows transistors connected thereto to open smoothly. A second filter is provided that has a non-polarized capacitor. In a coil switching process, the non-polarized capacitor operates as a voltage or current absorption circuit between driving transistors. The coil switching process creates transient energy of voltage transients. The non-polarized capacitor absorbs the transient energy. | 02-26-2015 |
20150084561 | Electric Motor Signature Reduction System - A method and apparatus for controlling a group of electric motors. A controller is configured to identify a group of switching frequencies for a desired signature for the group of electric motors. The controller is further configured to control switching of a current supplied to the group of electric motors with the group of switching frequencies for the desired signature identified. | 03-26-2015 |
20150115853 | CONTROL DEVICE FOR ELIMINATING MALFUNCTIONS IN A NETWORK - Electrical malfunctions in a network which are caused by torque fluctuations of an electric motor, in particular flicker, are reduced by using a control device. For simple and cost-effective minimizing or even correction of such malfunctions with the control device, the control device has at least one first input for supplying an input signal which contains information suitable for determining the loading of the network by torque fluctuations and at least one output for transmitting an output signal to at least one converter supplying the electric motor. This makes it possible to reduce or ideally to eliminate electrical malfunctions in a network which are caused by torque fluctuation of the electric motor. | 04-30-2015 |
20150145451 | CONTROL APPARATUS FOR SYNCHRONOUS ROTARY MACHINE ENABLING SUPPRESSION OF ROTOR VIBRATION - In a synchronous rotary machine such as a synchronous motor, respective values of the number of pole pairs of the rotor and the number of stator slots are predetermined such as to enable drive currents to be passed through the stator windings which suppress specific varying electromagnetic forces that act on the rotor and produce vibration. The drive current of each phase of the motor consists of a fundamental-frequency sinusoidal waveform current having specific harmonic-frequency currents superimposed thereon, the harmonic-frequency currents having angular velocities which are appropriate, with respect to the angular variation velocities of the specific varying electromagnetic forces, for suppressing these forces. | 05-28-2015 |
20150318806 | Current Profile Strategy for Minimizing Torque Ripple and Current - A method of controlling an electric motor may include determining a desired torque at the electric motor. A current at a first phase of the electric motor may be calculated at a controller. The calculated current may be a current that results in supplying the desired torque at the electric motor. The controller may compare the calculated current to a predetermined threshold current, and when the calculated current is greater than the predetermined threshold current, the controller may reduce the calculated current to the predetermined threshold current and adjust a current in a second phase adjacent to the first phase of the electric motor to continue to supply the desired torque at the electric motor. | 11-05-2015 |
20160072417 | APPARATUS AND METHOD FOR CONTROLLING VIBRATION OF DRIVING MOTOR IN VEHICLE - The present disclosure provides an apparatus and a method for controlling a vibration of a driving motor in a vehicle by generating a vibration reduction torque using gains that correspond to a torque variation and an RPM of a driving motor. The method includes storing a gain table in which gain values that correspond to a torque variation and a revolution per minute (RPM) of a driving motor in a vehicle are recorded. The torque variation of the driving motor and the RPM of the driving motor are detected. The gain values are determined using the detected torque variation and RPM of the driving motor based on the gain table and reducing. In addition, a vibration of the driving motor is reduced based on the determined gain values. | 03-10-2016 |
20160111986 | ELECTRONICALLY COMMUTATED ELECTRIC MOTOR WITH HARMONIC COMPENSATION - The invention relates to an electronically commutated electric motor with a stator and a rotor, which is designed as a permanent magnet rotor in particular. The electric motor also has a control unit which is connected to the stator. The control unit is designed to generate control signals for energizing the stator coils of the stator in order to generate a rotational magnetic field. The electric motor is designed to at least partly compensate for a torque ripple of a torque generated by the rotor. According to the invention, the electric motor has a rotor position sensor and a current sensor. The current sensor is designed to detect currents flowing in the stator coils and to generate a current signal which represents the currents. The control unit preferably has a processing unit which is designed to ascertain harmonics of the electromotive force dependent on the current signal, a voltage applied to the stator coils, and a rotor position signal generated by the rotor position sensor and to generate a control signal which compensates for the effect of the harmonics. The control unit, in particular the processing unit, is designed to superimpose the compensating control signal with the control signal so as to completely or at least partly compensate for the effect of the harmonics and thus the torque ripple. | 04-21-2016 |
20160141984 | Method and System for Traction Motor Torque Ripple Compensation - Torque ripple produced by a traction motor of an electric vehicle when the motor produces torque from a motor current is compensated for by modifying operation of the motor according to a difference between an expected position of the motor to produce a desired torque from the current and the actual position of the motor when producing torque from the current. | 05-19-2016 |