Vector Control (e.g., Dq-axis Control, 3-2 Phase Conversion, Etc.) Patents (Class 318/400.02)
  • Patent number: 10439526
    Abstract: A field oriented control (FOC) system and method provides smooth field-oriented startup for three-phase sensorless permanent magnet synchronous motors (PMSMs) despite the absence of load information. The system uses the rotor flux projection on the d- or q-axis to determine whether the stator flux current reference being applied during reference startup phase is sufficient to spin the PMSM, thereby providing smooth operation during the reference startup phase and saving energy relative to applying rated current. The system also determines a suitable initial value for the stator torque current reference to use at the start of closed-loop sensorless FOC control mode based on an angle difference between the reference and estimated angles. Since this angle difference is reflective of the load on the PMSM, the selected initial value allows the system to achieve a smooth transition from reference startup mode to closed-loop sensorless FOC control mode.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: October 8, 2019
    Assignee: DANFOSS POWER ELECTRONICS A/S
    Inventor: Gang Tian
  • Patent number: 10439523
    Abstract: In a method for controlling an operation of an electric motor, electric voltages applied to electric phases of the electric motor are generated and output in a modulation in a controlled manner dependent on a rotor position of the electric motor and a target/actual comparison of at least one first variable which characterizes a load on the electric motor or an actual rotational speed of the electric motor. A rotor position angle, which characterizes the rotor position, is complemented with a specified preliminary control angle and another regulated preliminary control angle component upon reaching a field weakening range of the electric motor so as to form a sum angle. The sum angle is used to characterize the rotor position in the modulation upon reaching the field weakening range. The disclosure also relates to a device for controlling an operation of an electric motor.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: October 8, 2019
    Assignee: Conti Temic microelectronic GmbH
    Inventors: Patrick Hinze, Andreas Schnell, Andreas Schulze
  • Patent number: 10432124
    Abstract: In a current detection apparatus, a corrector obtains first current-value pairs of the plural values of the corrective first phase current and the respective plural values of the corrective first phase bus-based current synchronized with the plural values of the corrective first phase current. The corrector obtains second current-value pairs of the plural values of the corrective second phase current and the respective plural values of the corrective second phase bus-based current synchronized with the plural pairs of the corrective second phase current. The corrector corrects at least target first and second phase currents detected by a first current detector based on the obtained first current-value pairs and the second current-value pairs to thereby align amplitudes of the respective target first and second phase currents with each other.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: October 1, 2019
    Assignee: DENSO CORPORATION
    Inventor: Yasuaki Aoki
  • Patent number: 10425031
    Abstract: In a motor driver of the present invention, voltage and current values measured by a voltage and current detector and a voltage value measured by a voltage detector are determined as first measurement results, in the state of turning on semiconductor switching elements connected between a positive terminal of a capacitor and motor coils. Voltage and current values measured by the voltage and current detector and a voltage value measured by the voltage detector are determined as second measurement results, in the state of, as to a group A, turning on a semiconductor switching element connected between the positive terminal of the capacitor and the motor coil, and as to a group B, turning on semiconductor switching elements connected between a negative terminal of the capacitor and the motor coil. The insulation resistance values are calculated between the motor coils of each group A or B and a ground.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: September 24, 2019
    Assignee: FANUC CORPORATION
    Inventors: Hiroyasu Satou, Masaya Tateda, Youichirou Ooi, Akira Hirai, Kiichi Inaba
  • Patent number: 10418922
    Abstract: A 3-phase motor driver circuit has a first input to be coupled to an output of a first phase current sensor, and a second input that represents a zero reference. A controller adjusts one or more of a first phase voltage, a second phase voltage, and a third phase voltage, until a comparison between the first input and the input indicates that the first input has reached the zero reference, and in response the controller captures an output of a second phase current sensor and an output of a third phase current sensor. The controller then stores, in memory, calibration data that is based on the captured outputs of the second and third phase current sensors. Other aspects are also described.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: September 17, 2019
    Assignee: Verb Surgical Inc.
    Inventor: Jan Bosteels
  • Patent number: 10418929
    Abstract: Provided are: a synchronous machine having permanent magnets as a field system; a stress estimator that estimates stress acting on the permanent magnets; and a first magnet temperature corrector that calculates an amount of demagnetization due to stress of armature interlinkage magnetic flux on the basis of the estimated stress, estimates an amount of demagnetization due to stress of the armature interlinkage magnetic flux on the basis of the rotor position of the synchronous machine, a current command and a voltage command, and the amount of demagnetization due to stress of the armature interlinkage magnetic flux; and outputs a permanent magnet temperature estimated value after correction, having factored therein the amount of demagnetization due to stress of the armature interlinkage magnetic flux from the estimated armature interlinkage magnetic flux.
    Type: Grant
    Filed: January 18, 2016
    Date of Patent: September 17, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Junichi Aizawa, Yoshikazu Nakano, Akihiro Daikoku, Shota Hanioka
  • Patent number: 10396696
    Abstract: A current regulator is provided for an electric machine drive system for driving an electric machine. The current regulator includes an adjustable damping module that has a value of virtual damping resistance that is applied at the current regulator. The value of virtual damping resistance is adjustable as a function of sampling frequency. A controller can control the current regulator by determining whether the sampling frequency has changed since a previous execution cycle of the current regulator, and when the sampling frequency has changed since the previous execution cycle, the controller can modify the damping value as a function of the sampling frequency to allow the damping value to change with the sampling frequency. The damping value has a new value of virtual damping resistance that is applied at the current regulator after modifying the damping value. The controller can then execute the current regulator in accordance with the modified damping value to generate the voltage commands.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: August 27, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Brent S. Gagas, Dwarakanath V. Simili, Caleb W. Secrest
  • Patent number: 10389284
    Abstract: A control arrangement of a multiple-stator machine, comprising a frequency converter for each of the plurality of stators and a controller for each frequency converter, wherein a controller of a frequency converter is realized to generate control signals for that frequency converter on the basis of current values relating to that stator, and to generate a compensation current value for a further controller on the basis of the received current values in the event of an open-circuit fault in a frequency converter; to receive a compensation current value from a further controller; and to compute a voltage reference for a subsequent transform stage of the controller on the basis of the received current values is provided. The invention further describes a current control module of a frequency converter controller of such a multi-stator machine; a multi-stator machine; and a method of performing fault-tolerant control of a multi-stator machine.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: August 20, 2019
    Assignee: SIEMENS GAMESA RENEWABLE ENERGY A/S
    Inventor: Nuno Miguel Amaral Freire
  • Patent number: 10374532
    Abstract: Disclosed are an apparatus, system and method for detecting, based on a mathematical model, a fault of a permanent magnet motor driven by a square wave. A fault diagnosis apparatus for the permanent magnet motor includes a current voltage measurement unit, a phase shift time calculation unit, and a control unit.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: August 6, 2019
    Assignee: KOREA ELECTRONICS TECHNOLOGY INSTITUTE
    Inventors: Joonsung Park, Jinhong Kim, Byongjo Hyon, Junhyuk Choi
  • Patent number: 10348234
    Abstract: An electronic control unit is configured to perform pulse width modulation control. The pulse width modulation control is to generate signals of a plurality of switching devices of an inverter by comparing a modulation wave of a voltage command of each phase based on a torque command of the motor, with a carrier wave, and perform switching of the switching devices. The electronic control unit is configured to generate the carrier wave so that, in each unit interval, a required time in the unit interval is equal to a total time of a plurality of unit components, and, in at least one unit interval, durations of at least two unit components of a plurality of unit components are different from each other.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: July 9, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Kenji Yamada
  • Patent number: 10348230
    Abstract: A control device for an AC rotary machine includes a magnetic-pole-position correction amount calculation device that calculates a magnetic-pole-position correction amount based on a detection-current vector detected when a voltage application device applies a voltage to the AC rotary machine according to a voltage command and on the voltage command, and stores in a storage device the magnetic-pole-position correction amount as it is associated with the detection-current vector. At normal operation of the AC rotary machine, a voltage-vector command generation device generates a voltage command for normal operation based on the detection-current vector detected by a current vector detection device and the magnetic-pole-position correction amount associated with the detection-current vector.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: July 9, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yosuke Hachiya, Kunihiro Kawahara
  • Patent number: 10348231
    Abstract: A motor control device includes a current detector which, in generating a feedback current value on the basis of the detection result of a three-phase AC current supplied from an inverter to a motor, generates a first current detection value based on a first sample timing and a second current detection value based on a second sample timing that is shorter than the first sample timing; a coordinates converter which converts the coordinates of the first current detection value and the second current detection value to q and d axes; and a detection current processor which generates a feedback current value from the coordinate conversion results.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: July 9, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomoya Tachibana, Masahiro Iezawa, Daiki Matsuura, Noriyuki Wada
  • Patent number: 10320317
    Abstract: In a sensorless control of a motor, due to the characteristic of a response frequency, an induced voltage, a magnetic pole position estimation gain, a current control gain, and a speed control gain are closely related. An object of the invention is to enable the induced voltage and the frequency characteristic of a magnetic pole position estimation system to be clearly designed and to theoretically and quantitatively design all of the control gains necessary for the sensorless control so as to solve a problem that a method of designing those parameters cannot be established and the parameters have to be adjusted in a try and error manner. A control device has an estimator estimating an estimation induced voltage and a phase error of a motor by applying an induced-voltage observer and a controller controlling the motor on the basis of the estimation induced voltage and the phase error.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: June 11, 2019
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Reiji Yamasaki, Yutaka Ono
  • Patent number: 10293243
    Abstract: When an electric vehicle is traveling downhill, experiencing regenerative braking, or otherwise forcing the vehicle motor to turn faster than the commanded motor torque, the vehicle motor produces electrical energy that can be used to recharge a vehicle battery. However, if the vehicle battery is already nearly or fully charged, the excess electrical energy produced may damage the battery. Control systems described herein may reduce and/or dispose of the excess energy by manipulating the motor flux (i.e., direct) current and quadrature current independently.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: May 21, 2019
    Assignee: Future Motion, Inc.
    Inventors: Kyle Jonathan Doerksen, Daniel J. Wood, Julian De La Rua
  • Patent number: 10263555
    Abstract: A method of determining angular position (0) of a rotor of an N-phase permanent magnet motor (PMM). A processor having an associated stored angular position determination (APD) algorithm is programmed to implement the algorithm to cause an associated motor controller to execute steps including forcing one vector at a time a phase vector set of current or voltage vectors to stator terminals of windings for the N-phases a positive and negative magnitude vector, wherein the vector magnitude is sufficiently small to not move the rotor, and a time duration for the forcing current or voltage vectors is essentially constant. The resulting stator current or voltage levels are measured for each current or voltage vector. An N-dimension current vector or voltage vector is generated from superposition of the resulting stator current levels or resulting stator voltage levels. The N-dimension current vector or voltage vector is used to determine angular position.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: April 16, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Eric James Thomas, David Patrick Magee
  • Patent number: 10263556
    Abstract: A method and a system for correcting an initial zero position deviation are provided, which is applied to a permanent magnet synchronous motor and a resolver. The method includes: driving a rotor of the permanent magnet synchronous motor to rotate at a constant speed; acquiring counter electromotive forces of a stator of the permanent magnet synchronous motor and a position of a rotor of the resolver; calculating a space vector phase angle ?1 based on the counter electromotive forces; acquiring a rotation angle ?2 measured by the resolver; calculating an installation deviation ?? corresponding to the space vector phase angle ?1 and the rotation angle ?2; and adjusting a position of the resolver until the installation deviation ?? meets a precision requirement.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: April 16, 2019
    Assignee: CRRC ZHUZHOU INSTITUTE CO., LTD.
    Inventors: Jianghua Feng, Junfeng Xu, Yuliang Wen, Jing Shang, Jiade Huang, Xiaofan Zeng, Zhaoyang Zhang, Hanfeng Zheng, Xiong Liu, Yaping He
  • Patent number: 10254174
    Abstract: A method for energizing the stator windings of a rotating field machine operable in motor mode, the stator windings respectively being impinged upon with phase currents that are predefined using a vector-based method. The phase currents are impinged upon at least in part with bias currents that are determined by the vector-based method in such a way that they exhibit no torque effectiveness in the rotating field machine.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: April 9, 2019
    Assignees: ROBERT BOSCH GMBH, SEG AUTOMOTIVE GERMANY GMBH
    Inventor: Manuel Hoellmann
  • Patent number: 10243503
    Abstract: The present invention relates to drive controller and control method for an electric motor equipped with coil sets corresponding to plural phases. The drive controller and control method for an electric motor of the present invention control, in case of abnormal energization that a potential of the coil reaches a power supply potential or a ground potential, at least one of a high-potential side switching element and a low-potential side switching element in a failed energization system involving the abnormal energization into ON state so as to reduce a phase-to-phase impedance and also, detect a braking torque generated in the energization system involving the abnormal energization to control an output of a normal energization system not suffering from the abnormal energization based on the detected braking torque.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: March 26, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Tomonobu Koseki, Tomishige Yatsugi
  • Patent number: 10236812
    Abstract: A method may be used to error compensate a measurement of an electric motor's rotor position in a power steering system of a motor vehicle. The electric motor generates torque for assisting steering of the motor vehicle, and stray magnetic fields of motor currents affect the measurement of the rotor position with a magneto-resistive rotor position sensor. The method may involve calculating at least two compensation values based on a current vector, rotor position, and hardware dependent parameters. The at least two compensation values account for errors in the rotor position measurement due to stray magnetic fields of motor currents. The method may also involve calculating a compensated rotor position signal by subtracting the at least two compensation values of the measured rotor position, as well as transferring the compensated rotor position signal as part of a feed-back loop to a target motor torque determination in the motor control.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: March 19, 2019
    Assignees: THYSSENKRUPP PRESTA AG, THYSSENKRUPP AG
    Inventor: Roland Gémesi
  • Patent number: 10236803
    Abstract: A method is provided for controlling a traction motor for an electrified vehicle, wherein the motor is driven by a pulse-width modulated inverter. A drive command from a driver of the vehicle is converted into a demanded torque. A substantially fixed DC link voltage is maintained from a DC power source. An input voltage for supplying to the inverter is calculated that causes the motor to deliver the demanded torque at a transition point between a constant-torque region and a field-weakening region of torque production. The voltage from the DC link is converted to the determined input voltage at an input to the inverter. By lowering the voltage applied to the inverter, switching losses and harmonic losses are reduced.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: March 19, 2019
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventor: Craig B. Rogers
  • Patent number: 10231632
    Abstract: Described is an apparatus which comprises: a current source to generate a current having AC and DC components; a current-to-voltage converter to convert the current or a copy of the current to a voltage proportional to a resistance, the voltage having AC and DC components that correspond to the AC and DC components of the current; a first sample-and-hold circuit to sample and filter the AC component from the voltage and to provide an output voltage with the DC component; a second sample-and-hold circuit to sample the output voltage; a voltage-to-current converter to convert the sampled output voltage to a corresponding current; and an amplifier to receive the output voltage.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: March 19, 2019
    Assignee: Intel Corporation
    Inventor: Craig P. Finlinson
  • Patent number: 10236814
    Abstract: A motor controller includes an inverter including circuitry which supplies power to a motor, and a controller including circuitry which controls the inverter such that the circuitry of the inverter supplies an AC current to a first axis of a stationary orthogonal coordinate system in the motor while changing a frequency of the AC current. The first axis has a predetermined phase relationship with a phase voltage of the motor.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: March 19, 2019
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Takahiro Saeki
  • Patent number: 10211765
    Abstract: A motor control device includes a position sensor that detects a position of a motor, an AD converter that converts an analog signal, which is a detection value of a motor current, into a digital signal, and a control circuit that drives an inverter using an output signal of the AD converter. The control circuit starts the AD converter during a permission period, and performs processing for the analog-digital converter during an electrical half cycle including a permission period. The length of a prohibition period obtained by excluding a permission period from an electrical half cycle decreases as the rotating speed of the motor increases.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: February 19, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koichi Arisawa, Keisuke Uemura, Yuji Takayama, Yosuke Shinomoto
  • Patent number: 10199972
    Abstract: In a control device for an electric motor (101), a three-phase/two-phase conversion section (203) outputs N d-axis current values and N q-axis current values in each measurement period that is 1/N of a carrier period. An average value calculation section (204) calculates average values of those values. A difference calculation section (205) calculates a difference between a k-th d-axis current value and the average value of the d-axis current values as a d-axis current difference, and calculates a difference between a k-th q-axis current value and the average value of the q-axis current values as a q-axis current difference. A filtering section (206) performs low-pass filtering on each difference, and outputs d-axis and q-axis current correction values. A correction calculation section (207) performs a linear operation of each k-th current value and the corresponding current correction value, and outputs the corrected current values.
    Type: Grant
    Filed: February 5, 2018
    Date of Patent: February 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Jun Kitagawa, Yasufumi Ogawa, Daiki Matsuura
  • Patent number: 10199979
    Abstract: A power conversion device includes an alternating current rotating machine having a multiple of multi-phase windings, a multiple of power conversion means that convert direct current voltage of a direct current power supply based on a multiple of switching signals and apply voltage to the multiple of multi-phase windings, first current detection means that detects a first bus current, which is current flowing between the power conversion means that applies voltage to one multi-phase windings of the multiple of multi-phase windings and the direct current power supply, and first phase current calculation means that calculates the current flowing through the one multi-phase windings based on the first bus current, wherein the first current detection means detects the first bus current at a timing at which a multiple of voltage vectors based on the multiple of switching signals neighbor or coincide.
    Type: Grant
    Filed: November 11, 2013
    Date of Patent: February 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Akira Furukawa
  • Patent number: 10177638
    Abstract: A rotor position encoder (01) for an electronically commutated electric machine (02) having a stator and a rotor (03) and including a rotor position sensor (05) which is mounted on the stator so as to rotate therewith and has the purpose of detecting the rotational position of the rotor (03) with respect to the magnetic field of the stator, and a signal encoder (07) which is mounted on the rotor (03) so as to rotate therewith. The rotor position encoder is defined in that it has a reference encoder (08) for detecting reference values of the magnetic flux density of the rotor field, wherein the reference values (09) serve to determine an angular offset (11) between the signal encoder (07) and the position of the rotor (03). Furthermore, a method for determining an angular offset (11) between a signal encoder (07) of a rotor position encoder (01) and a rotor position of an electronically commutated electric machine (02) is provided.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: January 8, 2019
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventor: Benjamin Kaufner
  • Patent number: 10158317
    Abstract: In a control apparatus for an alternating current (AC) motor, a control mode switching determiner compares a modulation rate with a modulation rate threshold, and selects between a synchronous control mode to perform synchronous control in a range where the modulation rate is equal to or greater than a modulation rate threshold and an asynchronous control mode to perform asynchronous control in a range where the modulation rate is less than the modulation rate threshold. The control mode switching determiner uses a different modulation rate threshold in a low rotational speed range and a high rotational speed range such that the modulation rate threshold in the low rotational speed range is greater than the modulation rate threshold in the high rotational speed range. A selector selects between outputting the synchronous pulse signal and outputting the asynchronous pulse signal.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: December 18, 2018
    Assignee: DENSO CORPORATION
    Inventor: Taizo Kondo
  • Patent number: 10141877
    Abstract: A method for controlling a permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The method includes: presuming, based on a target speed and an estimated speed that is an estimated value of a rotational speed of the rotor, whether or not a step-out occurs; correcting, when it is presumed that a step-out occurs, an estimated angle that is an estimated value of a position of magnetic poles of the rotor; and controlling, based on a post-correction estimated angle that is the estimated angle after the correction, a current flowing through the armature to cause the rotating magnetic field rotating at the target speed.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: November 27, 2018
    Assignee: Konica Minolta, Inc.
    Inventors: Yasuhiro Koide, Yuta Tachibana, Daichi Suzuki, Hiroyuki Yoshikawa
  • Patent number: 10116251
    Abstract: A motor drive device, which supplies electric power from a power element to a motor, and dissipates heat of the power element by way of a heat sink, includes a temperature detector that detects the actual temperature of the heat sink and an electric current detector that detects electric current from the power element to the motor. An actual temperature variation calculation unit calculates an actual temperature variation of the heat sink relative to time from the actual temperature, and an estimated temperature variation calculation unit calculates an estimated temperature variation of the heat sink relative to time from the estimated temperature. A temperature abnormality determination unit determines a temperature abnormality of the heat sink according to whether or not the actual temperature variation is departing from a permitted range based on the estimated temperature variation.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: October 30, 2018
    Assignee: FANUC CORPORATION
    Inventors: Kenichi Okuaki, Kazuhiro Yamamoto
  • Patent number: 10110150
    Abstract: A primary magnetic flux command value is changed in accordance with a torque of a rotary electric motor to control a current phase of an armature current with respect to a q axis that advances by ?/2 with respect to a d axis in phase with a field flux to be a desired phase in accordance with the torque.
    Type: Grant
    Filed: October 8, 2013
    Date of Patent: October 23, 2018
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takeshi Araki, Naoto Kobayashi, Nobuki Kitano
  • Patent number: 10103667
    Abstract: A system for preventing controller windup in an electric motor includes a limiting module that determines a limited voltage command in response to a commanded voltage exceeding an available voltage of a motor power source, the limited voltage command is applied to an electric motor, a saturation parameter module that determines a saturation parameter based on the limited voltage command, the saturation parameter indicates a magnitude of the commanded voltage exceeding the available voltage, a non-linear processing module that processes the saturation parameter to generate a processed saturation parameter, and a reference current modifier module that generates a modified current command based on the processed saturation parameter, the modified current command is applied to the control system to improve the current command tracking.
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: October 16, 2018
    Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventors: Prerit Pramod, Julie A. Kleinau
  • Patent number: 10069452
    Abstract: In a motor driving system, a motor driving system is provided which simplifies the system by ceasing ON/OFF control of a commercial driving command, and by performing commercial synchronous transfer and capture control based on a drive speed reference. A system controller performs synchronization control so as to make a drive output coincident with a phase/amplitude of a commercial AC power source when a rotation speed of a motor exceeds a drive speed reference n2, and when a prescribed requirement is satisfied, the commercial AC power source is synchronously transferred, and the motor is driven by the commercial AC power source. In addition, when the drive speed reference is set to n1, and a drive output side switch is closed, the drive output is connected to the commercial AC power source, and when a prescribed requirement is satisfied, the motor is started to be driven at a variable speed (t7), and thereby the synchronous capture is performed.
    Type: Grant
    Filed: November 10, 2016
    Date of Patent: September 4, 2018
    Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation
    Inventor: Toshiaki Oka
  • Patent number: 10063166
    Abstract: This disclosure discloses a motor driving system including a motor with an encoder and a motor driving device configured to control and drive the motor based on a motor control command. The motor driving device includes a first position detection unit configured to perform a magnetic pole position detection process for the motor to detect a position of the motor. When determining whether miswiring is present between the motor driving device and the motor, the motor driving device controls and drives the motor using a first detection result of the first position detection unit and determines miswiring of the motor based on a second detection result that is a position detection result of the motor by the encoder.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: August 28, 2018
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yusuke Oka, Tadashi Okubo
  • Patent number: 10046792
    Abstract: The present invention relates to an electromechanical motor vehicle power steering mechanism for assisting steering of a motor vehicle by conferring torque generated by an electric motor to a steering mechanism. A steering controller receives at least signals representative of the vehicle velocity and the torque applied to a steering wheel and a rotor position signal to determine a target motor torque, a motor controller which receives the target motor torque from the steering controller and transfers it into target voltages expressed in a coordinate system fixed to the stator and a motor driver which transforms the target voltages into motor currents, at least one current measurement unit which measures the motor currents, wherein the mechanism further comprises a current estimation unit which estimates the target currents and a diagnostic unit which compares the estimated target currents to the measured motor currents in order to identify and remedy occurring faults.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: August 14, 2018
    Assignee: thyssenkrupp AG
    Inventors: Ádám Sóti, Ferenc Illés
  • Patent number: 10046790
    Abstract: An electric power steering apparatus includes a torque control system to calculate a current command value and a current control system to control a motor current value passing through a motor based on the current command value. A first calculation period of the torque control system is equal to or longer than a second calculation period of the current control system. The current control system includes a specific frequency band removing section that attenuates a frequency component which multiplies at least one natural number by an approximate half of a calculation frequency of the torque control system to the current command value. The specific frequency band removing section includes notch filters that set an attenuation frequency or includes the notch filters and a phase delay filter that has a cutoff frequency, which is set to a lower frequency side than a frequency which is attenuated by the notch filters.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: August 14, 2018
    Assignee: NSK LTD.
    Inventor: Takahiro Tsubaki
  • Patent number: 10033300
    Abstract: To include a carrier-wave generation unit to generate a first carrier wave with a frequency higher than a modulation wave, and a second carrier wave with a frequency lower than the first carrier wave, a comparison unit to compare either the first carrier wave or the second carrier wave to the modulation wave in order to generate a switching signal. The carrier-wave generation unit outputs the second carrier wave when a modulation factor is lower than a threshold value, and outputs the first carrier wave when the modulation factor is equal to or higher than the threshold value. When the modulation factor is equal to or higher than the threshold value, a power conversion unit operates in an overmodulation mode, in which the switching operation is stopped during a period longer than one cycle of the second carrier wave.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: July 24, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshinori Yamashita, Sho Kato
  • Patent number: 10027261
    Abstract: A motor apparatus includes: an inverter arranged to drive a motor with a voltage outputted from a driving element; a rectifier circuit arranged to rectify alternating-current power to generate direct-current power to be applied to the driving element; a measuring section arranged to measure a voltage of the direct-current power; and a control circuit arranged to control the inverter in accordance with a result of a measurement by the measuring section; wherein the control circuit is arranged to vary an amplitude value of a drive signal to be applied to a base or gate of the driving element in a complementary manner in relation to a fluctuation in the voltage of the direct-current power.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: July 17, 2018
    Assignee: NIDEC SERVO CORPORATION
    Inventor: Masatomo Ishikawa
  • Patent number: 10003287
    Abstract: Techniques for motor magnet degradation controls and diagnostics are disclosed. An exemplary technique determines q-axis current, d-axis current, q-axis voltage, and/or d-axis voltage of a permanent magnet motor based upon sensed current and voltage information of the motor. This information is utilized to determine flux information. The flux information is utilized in evaluating collective state conditions of a plurality of motor magnets and evaluating localized state conditions of a subset of the plurality of motor magnets. The evaluations can be used to identify degradation or damage to one or more of the magnets which may occur as a result of elevated temperature conditions, physical degradation, or chemical degradation.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: June 19, 2018
    Assignee: Trane International Inc.
    Inventors: Nathan Thomas West, David Marshall Foye
  • Patent number: 9998049
    Abstract: An inverter control device includes an inverter main circuit, a current detector, a voltage detector that detects a DC voltage between DC bus lines, and an inverter control unit that generates PWM signals to perform on/off control of a plurality of semiconductor switching elements respectively with a DC current and a DC voltage. The unit sets a carrier period of PWM signals to be 1/N times a calculation period in which the PWM signals are generated, performs detection of a DC current detected by the current detector in a 1/2 calculation period immediately before a calculation start timing for generating PWM signals, calculates an output voltage vector based on the detected DC current, and reflects PWM signals generated from the output voltage vector in one calculation period from a 1/2 calculation period after the calculation start timing to 3/2 control calculation periods after the same.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: June 12, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mitsuo Kashima, Shigeo Umehara
  • Patent number: 9998059
    Abstract: A motor driving apparatus including a motor including a stator and a rotor rotating in the stator, an inverter configured to supply a driving voltage to a stator coil wound on the stator so as to rotate the rotor, and a control unit configured to, when a target command value is received, change a predetermined reference start-up time point to a start-up time point corresponding to an electrical angle position of the rotor in correspondence with the target command value per rotation of the rotor and to control the inverter to supply the driving voltage at the start-up time point.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: June 12, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Gilsu Lee, Naechun Park, Kyunghoon Lee, Sungbae Song
  • Patent number: 9991834
    Abstract: A method of operating an electric motor is disclosed. The method includes: determining a d-axis resistance of an electric motor and a Q-axis resistance of the electric motor as a function of a bulk current; determining a d-axis inductance of the electric motor and a Q-axis inductance of the electric motor as a function of the bulk current; generating an estimated flux of the electric motor based on the d-axis resistance of the electric motor, the Q-axis resistance of the electric motor, the d-axis inductance of the electric motor, and the Q-axis inductance of the electric motor; generating an estimated angle of the electric motor based on the estimated flux of the electric motor; and, based on the estimated angle of the electric motor, controlling switching of an inverter that powers the electric motor.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: June 5, 2018
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Joseph G. Marcinkiewicz, Charles E. Green, Michael I. Henderson
  • Patent number: 9966886
    Abstract: 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, the motor current being acquired, and the motor voltage being set with the aid of a pulse-width-modulation method, a signal which is in synchrony with the pulse-width-modulation frequency being superimposed on the motor voltage value to be set, values of the motor current being acquired in synchrony with the pulse-width modulation frequency, a current component induced by the superimposed voltage signal and a residual current component, i.e., fundamental wave component, being determined, the current component induced by the superimposed voltage signal being used for determining an estimated rotor angle position, whose phase error in relation to the actual rotor angle position is reduced by means of a flux model, the residual current component being supplied to a current controller.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: May 8, 2018
    Assignee: SEW-EURODRIVE GMBH & CO. KG
    Inventors: Wolfgang Hammel, Matthias Hartmann, Harald Wolf
  • Patent number: 9956890
    Abstract: An electric vehicle includes a motor, an ECU, and an inverter device. A motor control module of the inverter device includes: a parameter map having motor parameters stored therein; an open loop control section to generate control variables in open loop control by a voltage equation using the parameters stored in the parameter map, in response to a torque command from the ECU; a current feedback control section to perform control to eliminate a deviation relative to a command current value generated in an inverter, in response to the torque command from the ECU; and a hybrid control section to control the motor on the basis of control variables which are generated on the basis of the control variables generated by the open loop control section and control variables generated by the current feedback control section.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: May 1, 2018
    Assignee: NTN CORPORATION
    Inventor: Guodong Li
  • Patent number: 9952065
    Abstract: A position sensor device to determine a position of a moving device comprises a detection unit to detect a signal generated by the moving device and an evaluation unit to determine a first position (?0(t1)) specifying the position of the moving device at a first time (t1). An error distance determination unit determines a velocity of the movement of the moving device and at least one error distance (?err1, ?err2, ?err3) specifying a distance by which the moving device moves on between the first time (t1) and a second time (t2) in dependence on the velocity and a propagation delay time (Tpd). A position correction unit is configured to determine a corrected position (?corr) in dependence on the at least one error distance (?err1, ?err2, ?err3) and the first position (?0(t1)).
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: April 24, 2018
    Assignee: AMS AG
    Inventors: Ruggero Leoncavallo, Kurt Riedmueller
  • Patent number: 9935575
    Abstract: Provided are a power conversion device, relating to control of detecting a bus current in operation, and capable of acquiring an average current through a small amount of calculation and being implemented by an inexpensive microcomputer. A variation in a winding current flowing through a multi-phase winding of an AC rotating machine, namely, a phase current, is small at a timing at which voltage vectors on both sides of an axis having a larger inductance out of d and q axes of the AC rotating machine are output. Thus, switching signals are generated at timings at which the voltage vectors on both sides of the axis having the larger inductance out of the d and q axes are output, and the bus current is detected in accordance with the switching signals, thereby acquiring a value close to an average of the winding current.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: April 3, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Akira Furukawa
  • Patent number: 9927473
    Abstract: The method includes operating the synchronous machine in idle operation; recording a phase voltage measured value of the synchronous machine; ascertaining a phase voltage expected value by allocating stored characteristics map values for the phase voltage, for the exciting current and the recorded rotational speed of the synchronous machine; and comparing the phase voltage expected value to the phase voltage measured value. Also described is a diagnostic device for carrying out this method, as well as a corresponding computer program product.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: March 27, 2018
    Assignees: ROBERT BOSCH GMBH, SEG AUTOMOTIVE GERMANY GMBH
    Inventors: Jie Ge, Paul Mehringer
  • Patent number: 9923502
    Abstract: A method for detecting a potential (Vn) includes stator wirings in a Y connection, and automatically adjusting a relationship with a position of a rotor as a system for realizing rotor position-sensorless stable drive of an AC motor where the three-phase stator wirings are in Y connection in the stop and low-speed ranges. A synchronous motor control apparatus includes a three-phase synchronous motor in which three-phase stator wirings are in a Y connection, and an inverter for driving the motor, wherein the synchronous motor is DC-conducted thereby to move a rotor to a predetermined position, and is applied with a pulse-shaped voltage from the inverter in the moved state so that a neutral point potential as potential (Vn) of the Y connection point is acquired when the pulse voltage is applied, thereby driving the synchronous motor based on the acquired value.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: March 20, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Yoshitaka Iwaji, Masaki Hano, Naoki Okamoto, Takeshi Umetsu
  • Patent number: 9915517
    Abstract: A method is disclosed for determining a rotor position of an electrically excited electrical machine by injecting voltage test signals at a plurality of space vector angles with a fundamental frequency which lies in a frequency range in which there is a difference in admittance in space vector angles; calculating resulting values of an excitation current indicator variable as Fourier coefficients of the excitation current resulting from the voltage test signal with reference to the fundamental frequency of the voltage test signal at the corresponding space vector angles; and determining the rotor position on the basis of the profile of the excitation current indicator variable.
    Type: Grant
    Filed: August 25, 2014
    Date of Patent: March 13, 2018
    Assignee: ABB Schweiz AG
    Inventors: Simon Feuersaenger, Mario Pacas, Christian Stulz
  • Patent number: 9917539
    Abstract: A control device includes: an induced voltage detection circuit that detects induced voltages which is generated in at least one coil of a brushless DC motor; a rotational position that detects the rotational position of a rotor of the brushless DC motor; an error correct circuit that calculates a first difference between a phase of the induced voltage detected by the induced voltage detection circuit and a phase of the rotational position detected by the rotational position detection circuit; a correction circuit that corrects the detected rotational position based on the first difference and outputs a corrected rotational position signal; and a drive signal generation circuit that adjusts a phase of a drive signal which is supplied to the brushless DC motor based on the corrected rotational position signal and generates the drive signal whose phase has been adjusted.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: March 13, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Naoki Omura
  • Patent number: 9912263
    Abstract: A control system for a refrigeration system motor includes an angle determination module that generates an output rotor angle indicating a desired angle of a rotor of the motor. A control module controls the motor based on the output rotor angle. An estimator module determines an estimated rotor angle. A transition module generates a transition signal in response to convergence of the estimator module. Upon startup, the angle determination module generates the output rotor angle based on a first rotor angle. Upon generation of the transition signal, the angle determination module generates the output rotor angle based on the first rotor angle and the estimated rotor angle. After generation of the transition signal, the angle determination module reduces a contribution of the first rotor angle to the output rotor angle over time until the output rotor angle is based on the estimated rotor angle independent of the first rotor angle.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: March 6, 2018
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Charles E. Green, Joseph G. Marcinkiewicz