Synchronous Motor Systems Patents (Class 318/700)
  • Patent number: 11349430
    Abstract: Technical solutions are described for controlling operation of an inverter to manage voltage upon a direct current (DC) bus and regenerative power (current) provided to a battery. A control system and method are provided to control operation of an electric machine using a controller. More specifically, the controller is configured to calculate a current-based torque limit to satisfy a regenerative current limit, and a voltage-based torque limit to satisfy a voltage limit constraint of the DC bus. The controller is configured to calculate a torque limit to satisfy the regenerative current and voltage limits of the DC bus, and to command a plurality of switches within the inverter to generate a direct-axis current from the electric machine corresponding to a torque demand and according to the torque limit. The proposed system and method provide for motor current that exceed a demagnetizing current limit of the electric machine.
    Type: Grant
    Filed: October 15, 2019
    Date of Patent: May 31, 2022
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Prerit Pramod, Krishna Namburi, Zhe Zhang
  • Patent number: 11196308
    Abstract: A field coil type rotating electric machine includes a field coil having a serially-connected coil section pair consisting of first and second coil sections, a diode having its cathode and anode respectively connected to opposite ends of the serially-connected coil section pair, a rotating shaft, and a rotor having main pole portions radially protruding from a rotor core. In the rotating electric machine, there are formed both a series resonance circuit including the first coil section and at least one capacitor and a parallel resonance circuit including the second coil section and the at least one capacitor. Electronic components electrically connected with the field coil, which include the diode and the at least one capacitor, are arranged so that an overall center of gravity of all the electronic components is located closer than each of centers of gravity of the electronic components to a central axis of the rotating shaft.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: December 7, 2021
    Assignee: DENSO CORPORATION
    Inventor: Masahiro Seguchi
  • Patent number: 11165381
    Abstract: A motor controller includes a current controller configured to generate control signals for driving a permanent magnet synchronous motor (PMSM), where the current controller is configured to measure voltage information and current information of the PMSM; a power constant controller configured to receive the voltage information and the current information, and generate a first target speed based on a target power of the PMSM and based on the voltage information and the current information; first signal generator configured to generate a second target speed; a speed constant controller coupled between the power constant controller and the current controller, wherein the speed constant controller is configured to switchably receive the first target speed and the second target speed, and regulate a motor speed of the PMSM based on the received first target speed or the received second target speed.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: November 2, 2021
    Inventors: Long Fei Jian, Toshio Takahashi
  • Patent number: 11152870
    Abstract: A power conversion device that suppresses voltage pulsation of a capacitor of a power converter with respect to a control target whose effective power is to be controlled is provided. The power conversion device includes a plurality of power conversion cells that are connected to each other, and convert a primary-side system voltage into a secondary-side system voltage, a capacitor that is connected to each of the plurality of power conversion cells, and a power conversion cell driver that drives the power conversion cells to add a 3N order higher-harmonic-wave voltage of each of alternating voltages of the plurality of power conversion cells to the each of alternating voltages, and output a voltage made by adding the each of alternating voltages and the 3N order higher-harmonic-wave voltage, when N is a natural number.
    Type: Grant
    Filed: October 4, 2018
    Date of Patent: October 19, 2021
    Assignee: Hitachi Industrial Products, Ltd.
    Inventors: Kimihisa Furukawa, Akihiko Kanouda, Yuuichi Mabuchi, Hiroyuki Shoji, Takae Shimada, Mitsuhiro Kadota, Mizuki Nakahara
  • Patent number: 11146189
    Abstract: A control device for drives of a machine switches between normal operation and special operation depending on power demand from a power supply. In both operating modes, the control device cyclically determines preliminary current setpoint values. In normal operation, the current setpoint values match the preliminary setpoint values. In special operation, the control device dynamically determines a proportional factor for the drives depending on nominal and/or actual operating states of the drives. The control device determines current setpoint values by modifying the preliminary current setpoint values so that a respective drive draws no more power than the product of the respective proportional factor and the available total power. The current setpoint values and the current actual values are fed to drive controllers for the first drives, by means of which the preliminary first current setpoint values are determined. The control characteristics of the drive controllers include an integral part.
    Type: Grant
    Filed: August 20, 2019
    Date of Patent: October 12, 2021
    Assignee: Siemens Aktiengesellschaft
    Inventors: David Bitterolf, Stefan Rupprecht, Bernd Wedel
  • Patent number: 11059705
    Abstract: This electric hoisting machine comprises: a motor driven by single-phase current; a cylindrical motor housing; a starting capacitor; a operating capacitor; a starting capacitor disconnecting switch; a control unit which controls the operation of the motor and which is covered by a control housing; and a housing case in which small-diameter cylindrical portions for accommodating the starting capacitor, a large-diameter cylindrical portion for accommodating the operating capacitor, and a large-diameter cylindrical portion for accommodating the starting capacitor disconnecting switch are integrally provided in a state of continuing in a horizontal row, the housing case being mounted on the outer periphery of the motor housing in such a manner that the cylindrical portions are oriented parallel to a rotation axis.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: July 13, 2021
    Assignee: KITO CORPORATION
    Inventor: Hidenori Minamidate
  • Patent number: 11043912
    Abstract: A sensorless position estimation and control system and method for a permanent magnet electric motor of a powertrain system of a vehicle involve determining a reference torque to be achieved by the electric motor based on a set of vehicle operating parameters, determining a reference current magnitude to achieve the determined reference torque using a lookup table, determining current commands for the electric motor based on the determined reference current magnitude and a fixed reference current angle, injecting a high frequency voltage into a voltage control loop for the electric motor and estimating, by the controller, a position of a rotor of the electric motor thereafter, and controlling a current provided to the electric motor based on the determined current commands and the estimated rotor position.
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: June 22, 2021
    Inventors: Daniel R Luedtke, Nitinkumar Patel, Mustafa Mohamadian, Lakshmi Narayanan Srivatchan
  • Patent number: 10992245
    Abstract: Technical solutions are described herein for position estimation of permanent magnet synchronous machines through vibration induced saliency. An example permanent magnet synchronous machine (PMSM) includes a motor control system to provide input command to the motor to cause a position of the motor to change. The PMSM further includes a motor position estimation module configured to estimate the position of the motor. The estimation includes measuring a current Iabc across the motor. The estimation further includes extracting a filtered current Iabc_inj at a predetermined frequency from the current Iabc. The estimation further includes estimating the position of the motor based on the filtered current Iabc_inj.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: April 27, 2021
    Assignee: Steering Solutions IP Holding Corporation
    Inventors: Zhe Zhang, Prerit Pramod
  • Patent number: 10972036
    Abstract: A control device for controlling a linear actuator having a linear motor and a brake device includes a magnetic pole position estimation means to estimate which of a plurality of sections obtained by dividing a magnetic pole position of 0° to 360°, the mover is located in on the basis of a direction of movement of the mover by pulse energization, a magnetic pole position setting means to perform direct current excitation at an estimated magnetic pole position estimated by the magnetic pole position estimation means and set the estimated magnetic pole position as a magnetic pole position of the mover, and a brake control means to turn on a brake device before pulse energization by the magnetic pole position estimation means is performed and turn off the brake device after the magnetic pole position estimation means estimates the section in which the mover is located.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: April 6, 2021
    Assignee: THK CO., LTD.
    Inventors: Junichi Sakai, Shuhei Yamanaka, Hideo Saito, Yuki Nomura, Hideya Nakayama
  • Patent number: 10944346
    Abstract: A device for estimating inductances of an electric machine having a salient-pole rotor is presented. The device comprises a processing system that controls stator voltages to constitute a balanced multi-phase alternating voltage when the rotor is stationary. The processing system estimates a position of the rotor based on a negative sequence component of stator currents. To estimate the quadrature-axis inductance, the processing system controls direct-axis current to be direct current and quadrature-axis voltage to be alternating voltage. The quadrature-axis inductance is estimated based on the quadrature-axis alternating voltage and on quadrature-axis alternating current. To estimate the direct-axis inductance, the processing system controls direct-axis voltage to be alternating voltage and the quadrature-axis voltage to be zero. The direct-axis inductance is estimated based on the direct-axis alternating voltage and on direct-axis alternating current.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: March 9, 2021
    Assignee: Vacon OY
    Inventor: Arto Sankala
  • Patent number: 10938297
    Abstract: An AC-DC conversion device that includes a major circuit portion and a control circuit. The major circuit portion includes a converter in which multiple switch portions in a bridge connection include separately-excited switching elements and snubber circuits connected in parallel with the switching elements; and the major circuit portion is connected to an alternating current power supply and a direct current circuit and applies, to the direct current circuit, an alternating current voltage applied from the alternating current power supply by an ON of the multiple switch portions. The control circuit controls the voltage applied to the direct current circuit by controlling the ON timing of the multiple switch portions by inputting a control pulse to each of the multiple switch portions.
    Type: Grant
    Filed: May 22, 2019
    Date of Patent: March 2, 2021
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Keisuke Hattori, Teruo Yoshino, Tomohisa Okami
  • Patent number: 10928452
    Abstract: To simplify determination of drive parameters upon driving a motor for which circuit constants are unknown, and shorten the time required in determination.
    Type: Grant
    Filed: February 8, 2019
    Date of Patent: February 23, 2021
    Assignee: FANUC CORPORATION
    Inventors: Kouki Oikawa, Yuuki Morita, Tadashi Okita
  • Patent number: 10917028
    Abstract: A motor driving control device has a motor driving unit configured to selectively energize coils with a plurality of phases of a motor, a control circuit unit configured to control an operation of the motor driving unit by outputting a driving control signal to the motor driving unit, and a position detector configured to output a position signal which corresponds to any one phase of the plurality of phases and a phase of which changes depending on a position of a rotor of the motor. the control circuit unit detects a transition of values of a back electromotive force induced in the one phase in a detection period corresponding to a change timing of the position signal when beginning to start up the motor, and determines a rotational state of the motor including a rotational direction of the motor based on a detection result of the transition of the values of the back electromotive force.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: February 9, 2021
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Xiao Zhou, Hiroyuki Kaidu, Masato Aoki, Mitsunari Terada
  • Patent number: 10910968
    Abstract: The present disclosure provides a motor drive device and a motor drive system for improving a control stability despite an imbalance in zero crossing points in a sensorless motor of which position of a rotor is estimated by a counter electromotive force. The motor drive device includes: a position detector configured to detect a rotational position of a rotor of a motor by detecting a plurality of zero crossing points of a counter electromotive force induced in the motor; and a controller configured to control the motor by estimating a phase change timing based on a time interval between a current zero crossing point and a previous zero crossing point of a same state as the current zero crossing point among the plurality of zero crossing points detected by the position detector.
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: February 2, 2021
    Assignee: KOREA ELECTRONICS TECHNOLOGY INSTITUTE
    Inventors: Joonsung Park, Junhyuk Choi, Jinhong Kim, Byongjo Hyon, Yongsu Noh, Dongmyoung Joo
  • Patent number: 10910974
    Abstract: A feedback control switching unit of an inverter control unit selects, based on a magnitude relationship between a predetermined switching determination amount and at least one switching threshold, at least one of feedback control units to thereby execute switching among feedback control modes, such as a current feedback control mode and a torque feedback control mode, of the respective feedback control units for driving of the AC motor. A switching command generating unit generates a switching command for an inverter based on a manipulated variable calculated by the selected feedback control unit. When a torque response request determining unit determines that a required torque responsiveness is high, the feedback control switching unit reduces the number of executions of switching among the feedback control modes.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: February 2, 2021
    Assignee: DENSO CORPORATION
    Inventors: Hidekazu Takahashi, Koji Irie
  • Patent number: 10879751
    Abstract: A rotating electric machine has a drive control part and a motor having a stator and a rotor. The drive control part has an external disturbance voltage instruction generation part, a switching signal generation part, first and second drive circuits, a current acquisition part detecting an external disturbance current flowing in three phase winding in each of a first coil and a second coil of the stator, and a phase angle estimation part detecting a phase angle of the rotor of the motor based on the detected external disturbance current. The drive control part adjusts turn-on/turn-off timings of switching signals so as to reduce a timing difference between corresponding line external disturbance voltages in the three phase windings more than the time difference without performing the timing adjustment while maintaining a duty ratio of these line external disturbance voltages to that when the timing adjustment is not performed.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: December 29, 2020
    Assignee: DENSO CORPORATION
    Inventor: Tomoya Takahashi
  • Patent number: 10873273
    Abstract: An apparatus includes: an inverter converting generated power of renewable energy resources to predetermined alternating-current power for output to a power transmission network; a PWM control unit controlling the inverter; a first detecting unit detecting the input voltage and current to the inverter; a second detecting unit detecting the output voltage, current, and frequency of the inverter; a power change deciding unit calculating the input and output powers of the inverter and the difference therebetween from the voltage and current of each of the input and output detected by the detecting units, and calculating a correction output power command with reference to an output power command; and a virtual synchronous inertia control unit calculating a virtual inertia characteristic based on the voltage, current, and frequency of the output detected by the second detecting unit and the correction output power command, and outputting a reference command to a PWM control unit.
    Type: Grant
    Filed: March 21, 2018
    Date of Patent: December 22, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Chia Tse Lee, Akira Kikuchi
  • Patent number: 10818458
    Abstract: Disclosed herein are control modules and methods for controlling recreational vehicle power in auxiliary systems. The control modules may be installed and/or retrofitted to connect with power systems in recreational vehicles and thereby control operation of auxiliary components, such as slide-outs and awnings, for example. The disclosed control modules and systems may be remotely and/or automatically operated and programmed via wireless devices and/or software applications.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: October 27, 2020
    Assignee: Command Electronics, LLC
    Inventors: Charles A Leonard, Mark D Ehrnsberger
  • Patent number: 10812003
    Abstract: A method and apparatus is described in which a series of short-circuiting pulses is applied to a motor. A current in the motor is determined after one or more of the series of short circuit pulses has completed. The duration of the short-circuit pulses is adjusted depending on the determined current. The method and apparatus may be used within an arrangement for catching a spinning motor.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: October 20, 2020
    Assignee: Danfoss Power Electronics A/S
    Inventors: Leandro Della Flora, Anton Smith
  • Patent number: 10704661
    Abstract: An actuator device having a motor driven cam, a follower coupled to an output member and driven by the cam, and a controller for controlling operation of the motor. The cam has a first cam surface, a second cam surface and a lift portion between the first and second cam surfaces. The controller is configured to identify a predetermined point on the lift portion as the follower is moved relative to the cam along the lift portion toward the second cam surface. The controller identifies the predetermined point based on a rate of change in the position of the output member along an output member axis as a function of the rotational position of the cam about a cam axis. The controller controls operation of the motor based on the predetermined point to position the follower on the second cam surface.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: July 7, 2020
    Assignee: American Axle & Manufacturing, Inc.
    Inventor: Curt D. Gilmore
  • Patent number: 10696141
    Abstract: A synchronous motor control device includes: a DC power supply; an inverter main circuit; a three-phase synchronous motor; and an inverter control unit that outputs a PWM signal used to control the inverter main circuit. The inverter control unit includes: a PWM signal generation unit; a start-up control unit that outputs a start-up voltage command value to the PWM signal generation unit at the time of start-up; a steady state control unit that calculates a steady state voltage command value in a steady state and outputs the value to the PWM signal generation unit; and a steady state control parameter initial value calculation unit that outputs an initial value of a control parameter to the steady state control unit such that an output voltage vector from the inverter main circuit to the three-phase synchronous motor is consistent before and after switching from the start-up to the steady state.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: June 30, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mitsuo Kashima, Tomohiro Kutsuki, Tomomi Higashikawa, Akiyoshi Muramatsu
  • Patent number: 10658958
    Abstract: A genset including at least one generator for generating electrical energy, which can be driven by a drive device is provided. Also provided is a detection device for detection of the presence of a grid fault in at least one phase of the power grid, a device for determining an operating state of the generator immediately before or upon detection of a grid fault, and a regulating device, to which the signals of the detection device and the device for determining an operating state of the generator can be fed. The regulating device is designed upon detection of a grid fault to reduce the power of the drive device in dependence of that operating state of the generator, which has been determined immediately before or upon detection of the grid fault.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: May 19, 2020
    Assignee: Innio Jenbacher GMBH & CO OG
    Inventors: Nikolaus Spyra, Lukas Vogl, Francisco Lopez
  • Patent number: 10608562
    Abstract: In an example, a system is disclosed. The system includes a rotor position estimation module configured to generate an adjustment signal to adjust a desired torque signal for a motor. The rotor position estimation module includes a sensor offset estimation module configured to estimate an offset position of a sensor based on (1) a motor current signal indicative of a current to rotate a rotor within the motor, (2) a motor voltage signal indicative of a voltage applied to a power inverter that provides the current to the motor, and (3) a motor parameter. The sensor can be disposed on the rotor. The rotor position estimation module also includes a speed adjustment module configured to generate the adjustment signal based on the estimated offset position.
    Type: Grant
    Filed: November 6, 2018
    Date of Patent: March 31, 2020
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Young Joo Lee, Kibok Lee, Brian J. Gallert
  • Patent number: 10574174
    Abstract: A method for operating an electrical machine having a stator and having a rotor with permanent magnets, includes: running the electrical machine; determining, while performing the running of the electrical machine, whether the permanent magnets have been demagnetized; finding, while running the electrical machine, the q-axis responsive to a determination that the permanent magnets have been demagnetized; firing a current pulse through the stator, while running the electrical machine, when the q-axis reaches a desired position relative to a selected stator phase, wherein the current pulse is constructed to remagnetize the permanent magnets; and continuing to run the electrical machine.
    Type: Grant
    Filed: December 30, 2017
    Date of Patent: February 25, 2020
    Assignee: ABB Schweiz AG
    Inventors: Alessandro Castagnini, Darren Tremelling, Elio Alberto Perigo, Giulio Secondo, Liming Liu
  • Patent number: 10536104
    Abstract: In a variable speed generator-motor apparatus, a power converter includes six two-terminal arms each formed by serially connecting k unit converters that can output arbitrary voltage, an AC rotating electric machine includes an armature winding with 60-degree phase zone formed from a double layer coil, the armature winding being divided into first and second pole sides to form double star connection by binding neutral points and to be drawn out as two sets of three-phase terminals; three-phase terminals on the first pole side are connected to first terminals of three arms, and second terminals of the three arms are star-connected to a first terminal of a DC power supply; three-phase terminals on the second pole side are connected to second terminals of remaining three arms, and first terminals of the three arms are star-connected to a second terminal of the DC power supply.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: January 14, 2020
    Assignee: HITACHI MITSUBISHI HYDRO CORPORATION
    Inventors: Akira Bando, Osamu Nagura
  • Patent number: 10511246
    Abstract: An initial rotor position detection device based on a permanent-magnet synchronous motor, including a host computer, a real-time simulation system, and a control system, where the real-time simulation system is connected to the control system, for determining an encoder pulse signal according to the model parameter of the permanent-magnet synchronous motor, the model parameter of the inverter, and a PWM pulse wave generated by the control system; and the control system is connected to the real-time simulation system, for using a binary search algorithm to determine an initial rotor angle of the permanent-magnet synchronous motor according to the encoder pulse signal sent by the real-time simulation system. A comprehensive closed-loop test circuit can be achieved by setting a host computer, a real-time simulation system, and a control system, and a used binary search algorithm can effectively and quickly detect an initial rotor position of a permanent-magnet synchronous motor.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: December 17, 2019
    Assignee: Wenzhou University
    Inventors: Yuxing Dai, Xiukai Ruan, Qibo Cai, Kelu Wu
  • Patent number: 10468985
    Abstract: An AC-DC converter includes a main switch that is controlled according to an input AC line voltage. The main switch is allowed to be switched when a level of the input AC line voltage is within a regulation band, and is prevented from being switched when the level of the input AC line voltage is not within the regulation band. The regulation band can be dynamically adjusted based on load condition. The AC-DC converter can be a buck, boost, or buck-boost converter.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: November 5, 2019
    Assignee: FAIRCHILD SEMICONDUCTOR CORPORATION
    Inventors: Jason Guo, Laszlo Balogh, Gwanbon Koo, Sangcheol Moon, Bonggeun Chung, Chenghao Jin
  • Patent number: 10447183
    Abstract: A motor is driven while suppressing drive torque ripple generated by the motor, when any of the phases is opened during the driving of the motor. A motor drive device controls the driving of a motor in which the armature windings of respective phases are independently provided. The motor drive device is equipped with: an inverter circuit for converting the DC power supplied through DC bus lines to three-phase AC powers and respectively outputting the three-phase AC powers to the armature windings of the respective phases; and a controller for controlling the inverter circuit. When any of the phases is opened in the AC powers output from the inverter circuit, the controller adjusts the difference between the phases of the respective currents flowing through the armature windings of normal phases so that the AC powers of the other normal phases except the opened phase are compensated each other.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: October 15, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Katsuhiro Hoshino, Shingo Nishiguchi, Toshisada Mitsui, Kazuto Oyama, Hideki Miyazaki
  • Patent number: 10439546
    Abstract: A motor vehicle servomotor arrangement includes an electric motor with a stator, a rotor and brushes, as well as a controller with a signal input and a signal output that is connected to the electric motor. The controller is configured to transmit a control signal to the electric motor in response to an input signal supplied via the signal input by a unique function. The controller is configured to modulate the control signal in such a way that different control signals are output upon successive identical input signals within predefined input signal ranges and/or time-variant control signals are output upon identical input signals.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: October 8, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Alexander Merz, Alexander Klein, Dean G. Sorrell
  • Patent number: 10429216
    Abstract: The invention provides a control circuit and a method for qualifying a fault for a synchronous machine.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: October 1, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Benjamin Lechner, Daniel Raichle, Daniel Zirkel, Michael Ungermann
  • Patent number: 10425028
    Abstract: A motor control device includes output command calculation circuitry and inertial load value calculation circuitry. The output command calculation circuitry is configured to calculate a motor output command, based on a motor acceleration command and an inertial load value indicative of a magnitude of inertia of a load on a motor. The inertial load value calculation circuitry is configured to calculate an estimated inertial load value with an adaptive observer, based on the motor output command and a motor actual output to be output from the motor, and configured to calculate the inertial load value, based on the estimated inertial load value.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: September 24, 2019
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yasufumi Yoshiura, Yasuhiko Kaku, Shouta Kawahara
  • Patent number: 10411632
    Abstract: A system for detecting and eliminating harmonic effects in the DQ plane of the non-sinusoidal back EMF voltages is provided. The system is a field oriented controller (FOC) that includes a poly-phase electric machine, proportional-integral-derivative controllers and a microcontroller. The microcontroller not only analyzes a stator current but analyzes a back electromotive force (BEMF) voltages to extract flux vectors of the EMF. These vectors have distortions as a result of the geometries and saturation effects inherent in the electrical machine. Therefore, the microcontroller corrects these defects by transmitting the BEMF vectors and the machine operating points, including the current rotational speed and current, into the algorithm, which in turn develops a command voltage in the DQ frame for the specific operating point. This command voltage is inserted into the control output of the current PI controller so to prevents the non-sinusoidal back EMF voltages from generating non-sinusoidal currents.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: September 10, 2019
    Assignee: KSR IP Holdings, LLC
    Inventors: Eric Hustedt, Pacifique Maisha
  • Patent number: 10396699
    Abstract: An anomaly diagnosing device diagnoses an anomaly in a single motor driven by multiple motor drive units. The multiple motor drive units supply AC currents to multiple multi-phase windings of the motor to drive the motor. The anomaly diagnosing device includes: a power consumption calculator for calculating power consumption in each of the multi-phase windings; a power difference calculator for calculating a difference in power consumption between the multi-phase windings; and a determination unit for determining that an anomaly is occurring when the absolute value of the difference has exceeded a threshold for a predetermined period of time.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: August 27, 2019
    Assignee: FANUC CORPORATION
    Inventors: Yuuki Morita, Kenji Takahashi, Tadashi Okita
  • Patent number: 10389288
    Abstract: A motor controller includes: a rotation speed estimating unit that estimates a rotation speed of an motor on the basis of current information and primary frequency information of the motor; a proximity switch that outputs an ON signal when a portion of a rotating body of the motor is in proximity and outputs an OFF signal when a portion of the rotating body of the motor is not in proximity; a rotation speed computing unit that computes a rotation speed of the motor on the basis of the ON signal and the OFF signal output from the proximity switch; and an abnormality detection unit that detects an abnormality in the rotation speed estimation value or an abnormality in the proximity switch when a difference between the estimated rotation speed estimation value and the computed rotation speed computation value is equal to or larger than a threshold.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: August 20, 2019
    Assignee: FANUC CORPORATION
    Inventors: Shoutarou Hashimoto, Yuuki Morita
  • Patent number: 10340821
    Abstract: Low speed and high speed estimates of rotor angle and speed relative to the stator are received from a low speed estimator and a high speed estimator, respectively. LS_?_EST and a subset of torque-controlling I_Q trajectory curve (“IQTC”) parameter values appropriate to low speed rotor operation are selected for rotor speeds below a low speed threshold value ?_LOW_THRS. HS_?_EST and a subset of IQTC curve parameter values appropriate to high speed rotor operation are selected for rotor speeds above a high speed threshold value ?_HIGH_THRS. LS_?_EST and the low speed subset of IQTC parameter values remain selected for rotor speeds less than ?_HIGH_THRS after accelerating to a rotor speed greater than ?_LOW_THRS. HS_?_EST and the subset of high speed IQTC parameter values remain selected for rotor speeds greater than ?_LOW_THRS after decelerating to a rotor speed less than ?_HIGH_THRS.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: July 2, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: David Patrick Magee, Eric James Thomas
  • Patent number: 10298158
    Abstract: A feedback amount calculation unit uses a deviation of a current from its command value or a deviation of an air-gap flux from its command value to calculate a feedback amount. A voltage error calculation unit calculates a variation range of a voltage error between a voltage value based on a voltage equation of the electric motor and a voltage command. The presence or absence of step-out of the electric motor is determined by comparison between the variation range of the voltage error and the feedback amount.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: May 21, 2019
    Assignee: Daikin Industries, Ltd.
    Inventors: Hiroshi Hibino, Nobuki Kitano
  • Patent number: 10291160
    Abstract: A method of operating a synchronous motor includes using a rotor angle observer model to calculate an observed rotor angle and a speed estimator model to calculate an observed angular speed of the rotor. The observed rotor angle may be used to ensure that the stator magnetic field generated by the stator is oriented 90° ahead of the rotor magnetic field. The observed angular speed may be used to regulate the motor operation to achieve the desired speed.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: May 14, 2019
    Assignees: Haier US Appliance Solutions, Inc., University of Louisville Research Foundation, Inc.
    Inventors: Joseph Wilson Latham, Paul Goodjohn, Michael Lee McIntyre
  • Patent number: 10254318
    Abstract: A method of estimating an input power of a motor comprises determining an output power of the motor; determining a speed of the motor; calculating a scaling factor as a function of the speed of the motor; and estimating the input power as a function of the scaling factor and the output power.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: April 9, 2019
    Assignee: Nidec Motor Corporation
    Inventors: Prakash B. Shahi, Robert J. Ploof, Jr.
  • Patent number: 10246083
    Abstract: Using an estimated electric angle calculated by an electric angle estimation unit, a PWM control unit controls an output of a motor generator (MG2) having an abnormality of a resolver. The electric angle estimation unit converts, into an estimated rotation angle speed, a rotation speed of MG2 estimated from rotation speeds of an engine and a normal motor generator mechanically coupled to MG2. The estimated electric angle is calculated by correcting a sum of the estimated electric angle in a previous control period and an estimated electric angle change amount between the previous control period and a present control period obtained from the estimated rotation angle speed, with a calculated and estimated electric angle error. The electric angle error is estimated from a control command for an inverter and an actual current value detected by a current sensor.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: April 2, 2019
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Shinichiro Minegishi
  • Patent number: 10243497
    Abstract: In an apparatus, a motor current limit calculator calculates a motor current limit to which a motor current is to be limited. A motor current command calculator calculates a motor current command representing a target value for the motor current. A current command corrector corrects the motor current command as a function of the motor current limit. A motor voltage command calculator calculates a motor voltage command as a function of the corrected motor current command and the motor current, and feed back the motor voltage command to the motor current limit calculator. The motor voltage command represents a target value for a voltage of the output power applied to the motor. The motor current limit calculator calculates the motor current limit in accordance with the motor current, the converter current limit, and the motor voltage command fed back from the motor voltage command calculator.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: March 26, 2019
    Assignee: DENSO CORPORATION
    Inventors: Haruo Suzuki, Hiroyasu Otake
  • Patent number: 10224837
    Abstract: A method for starting a drive motor. The drive motor includes a motor stator with stator coils and a motor rotor, and a control electronics system and a power electronics system which supply power to the stator coils with a predefined coil voltage and a predefined constant start-up rotation frequency to generate a rotating field to drive the motor rotor. The method includes supplying power to at least one stator coil with a coil voltage corresponding to a start value, increasing the coil voltage in steps, monitoring an electric current flowing through the power electronics system, and, when a specific minimum voltage drop is detected, terminating the increasing of the coil voltage in steps, and performing a safety increase of the coil voltage by increasing a start-up voltage value by a predefined safety value to a first operating voltage value where the motor rotor is drivable in an unregulated mode.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: March 5, 2019
    Assignee: PIERBURG PUMP TECHNOLOGY GMBH
    Inventors: Martin Schumachers, Mario Jansen, Joachim Mertens
  • Patent number: 10141878
    Abstract: A controller for a sensorless 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 controller is configured to apply a pulse voltage for generating a magnetic field vector for searching for the initial position to each of search sections obtained by dividing a target range, narrow down a target range in such a manner that a search section in which a largest amount of current flows through the armature by application of the pulse voltage is selected as a subsequent target range, and repeat the application processing and the narrow-down processing to estimate the initial position.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: November 27, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Daichi Suzuki, Yuta Tachibana, Hiroyuki Yoshikawa, Yasuhiro Koide
  • Patent number: 10059206
    Abstract: A method controls an electric drive system of a vehicle including an electric drive motor, a drive battery, and a drive inverter. The method includes detecting that a measurement of an insulation resistance between the battery and a chassis of the vehicle is below a preset threshold, detecting a closed state of relays connecting the battery to the inverter, and following the detecting the measurement and the detecting the closed state, activating a cooling fan of the electric drive motor until detecting that a measurement of the insulation resistance is above the preset threshold, within a limit of a first preset duration.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: August 28, 2018
    Assignee: RENAULT s.a.s.
    Inventors: Walid Ben Ahmed, Pietro Dolcini, Islam Ait-Hammouda, Pascal Le-Neel
  • Patent number: 10014804
    Abstract: Methods of starting a motor include coupling the motor to an AC power source via a switching circuit of a motor starter, detecting an output voltage produced by the switching circuit and responsively changing the output voltage and detecting an input voltage from the AC power source and responsively controlling a rate of change of the output voltage. Controlling the rate of change of the output voltage may include reducing a rate of increase of a magnitude of the output voltage responsive to detecting that the input voltage meets a first criterion. The methods may further include bypassing the switching circuit to connect the motor to the AC power source responsive to the output voltage meeting a second criterion or an output current provided to the motor meeting a third criterion.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: July 3, 2018
    Assignee: Eaton Intelligent Power Limited
    Inventors: John David Maurin, Ryan Kenneth Keating, Benjamin Stewart Wells
  • Patent number: 9979339
    Abstract: A system includes one or more synchronous generators mechanically coupled to an excitation system. The excitation system is configured to output an excitation signal to excite the synchronous generator to produce a voltage and a current at an output of the synchronous generator. During startup of the synchronous generator, the excitation system may also output pulses of the excitation signal to initiate synchronism of one or more non-rotating electric motors electrically coupled to the synchronous generator. In addition, the pulses may be output to urge rotation of the non-rotating electric motors into rotational electrical alignment with the synchronous generator and each other.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: May 22, 2018
    Assignee: Rolls-Royce North American Technologies Inc.
    Inventors: Mark Jon Blackwelder, Paul M. Rancuret
  • Patent number: 9912280
    Abstract: A rotating electric machine control device includes: an inverter in each winding set of a rotating electric machine having high and low potential-side switching elements corresponding to each phase; and a controller. The controller has: a signal generator of a control signal for turning on and off the high and low potential-side switching elements; a disturbance voltage estimating device calculating a disturbance voltage estimation value of a disturbance voltage, which is generated in a normal system, based on a current flowing in a failure system when the short circuit failure occurs; and a command calculating device calculating a normal system command value in accordance with the disturbance voltage estimation value.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: March 6, 2018
    Assignee: DENSO CORPORATION
    Inventor: Takashi Suzuki
  • Patent number: 9899946
    Abstract: A control system for a switched reluctance (SR) machine having a rotor and a stator is provided. The control system may include a converter circuit in electrical communication between the stator and a common bus, and a controller configured to monitor a bus voltage of the converter circuit and a phase current of the SR machine. The controller may be configured to determine a phase voltage based on one or more of main pulses and any diagnostic pulses, determine an estimated flux based on the phase voltage and an associated mutual voltage, determine a rotor position based at least partially on the estimated flux, and control the SR machine based on the rotor position and a desired torque.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: February 20, 2018
    Assignee: Caterpillar Inc.
    Inventors: Seok-hee Han, Jackson Wai, Ahmed Khalil, Ernesto Inoa, Sangameshwar Sonth, Jesse Gerdes, James Michael Thorne
  • Patent number: 9885741
    Abstract: In order to reliably determine the supply voltages (Ui) of the individual phases (L1, L2, L3) of a load (4) in a multiphase supply network (2), in particular a three-phase supply network, a measuring module (6) is provided and is used to determine the supply voltages (Ui) from measuring voltages (Ui,mess) with the aid of a matrix operation. The matrix operation is used, in particular, to compensate for potential differences or potential shifts between the measuring system and the supply network (2) without the need for hardware measures, for example a voltage transformer.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: February 6, 2018
    Assignee: SIEMENS AKTIEGESELLSCHAFT
    Inventor: Klaus Behringer
  • Patent number: 9849806
    Abstract: A vehicle powertrain includes a DC-DC converter and a controller. The DC-DC converter is coupled between a traction battery and an inverter for an electric machine. The controller is configured to, in response to a rotational speed of the electric machine dropping below a back EMF threshold speed, transition to a current control based six step inverter mode and operate the DC-DC converter to output a voltage less than an open circuit voltage of the traction battery.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: December 26, 2017
    Assignee: Ford Global Technologies, LLC
    Inventors: Wei Xu, Fazal Urrahman Syed
  • Patent number: 9828971
    Abstract: System and methods for optimizing operation of a wind turbine are disclosed. In one aspect, the method also includes determining, via a converter controller of a power converter, a tap position of a tap changer configured between the power grid and a primary winding of a transformer. Another step includes calculating, via the converter controller, a primary voltage of the primary winding as a function of the tap position. The method also includes implementing, via the converter controller, a control action if the primary voltage or a measured secondary voltage of a secondary winding of the transformer is outside of a predetermined voltage range.
    Type: Grant
    Filed: November 20, 2014
    Date of Patent: November 28, 2017
    Assignee: General Electric Company
    Inventors: Igor Berroteran Gil, Anthony Michael Klodowski, Werner Gerhard Barton