Brushless Motor Closed-loop Control Patents (Class 318/400.01)
  • Patent number: 11327116
    Abstract: A pulse pattern generation device generating a pulse pattern for controlling switching elements provided in an inverter that operates a motor, the pulse pattern generation device includes a current calculation unit that calculates a current flowing through a coil when a voltage that is applied to the motor during the operation of the motor is virtually applied to the coil of the motor, an effective current calculation unit that calculates an effective current from the current calculated by the current calculation unit, an iron loss estimation unit that estimates an iron loss which originates in a core of the motor, and a pattern generation unit that generates a pulse pattern using an evaluation function including the iron loss estimated by the iron loss estimation unit and the effective current calculated by the effective current calculation unit as evaluation items.
    Type: Grant
    Filed: April 19, 2019
    Date of Patent: May 10, 2022
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Kazuki Yamane, Masamichi Nawa
  • Patent number: 11303235
    Abstract: A power tool is provided including a brushless motor having a stator defining a plurality of phases and a rotor. A power unit is provided including power switches operable to deliver power to the motor. A primary controller is interfaced with the power unit to output drive signals to drive the phases of the motor over a series of sectors of the rotor rotation. The primary controller measures a back-electromotive force voltage of the motor and transitions motor commutation from the present sector to the next sector based in relation to the back-EMF voltage. A second controller is provided to receive at least one of the drive signals, calculate a speed and/or direction of rotation of the motor from the drive signals, and take corrective action to cut off supply of power to the motor if it detects an overspeed condition or incorrect direction of rotation.
    Type: Grant
    Filed: April 20, 2020
    Date of Patent: April 12, 2022
    Assignee: Black & Decker Inc.
    Inventors: Jason Thrush, Gregory Besack, Michael J. Kowalski, John C. Vanko
  • Patent number: 11296644
    Abstract: A vehicle includes a traction battery, an inverter, and a controller. The inverter includes a plurality of pairs of switches. Each of the pairs includes an upper switch that is directly electrically connected with a positive terminal of the traction battery and a lower switch that is directly electrically connected with a negative terminal of the traction battery. The controller, responsive to presence of a fault condition and during each of consecutive switching periods, deactivates all of the switches for a predetermined portion of the switching period, activates only the upper switches for another predetermined portion of the switching period, deactivates all of the switches for yet another predetermined portion of the switching period, and activates only the lower switches for still yet another predetermined portion of the switching period.
    Type: Grant
    Filed: January 20, 2020
    Date of Patent: April 5, 2022
    Assignee: Ford Global Technologies, LLC
    Inventors: Xuemei Sun, Jiyao Wang, Hongjie Wu, William Reynolds, Silong Li, Michael W. Degner
  • Patent number: 11283375
    Abstract: To avoid cost increase, delay of response, time, and performance degradation in driving a power source including a plurality of servo motors and/or a servo motor with a plurality of windings. A slave unit drives a power source including a plurality of servo motors and/or a servo motor with a plurality of windings using a plurality of amplifiers on the basis of a command from a high-order controller.
    Type: Grant
    Filed: April 23, 2020
    Date of Patent: March 22, 2022
    Assignee: FANUC CORPORATION
    Inventor: Takehiro Yamaguchi
  • Patent number: 11251734
    Abstract: A method of operating a Brushless Direct Current Motor (BLDCM), the BLDCM of the type including: a series of concentric independently activated electromagnetic phase coils interacting with a series of permanent magnets to provide relative movement therebetween, the phase coils having temporal periods of activation time and deactivation time, the method including the steps of: (a) activating at least one of the phase coils for a short period of activation; and (b) measuring the voltage response across the phase coil of the deactivated phase coil during the short period of activation to determine the rotor position.
    Type: Grant
    Filed: June 29, 2021
    Date of Patent: February 15, 2022
    Inventor: Janislav Sega
  • Patent number: 11233451
    Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to bypass sensed signals in power converters. The disclosed methods, apparatus, systems and articles of manufacture provide an apparatus to bypass sensed signals in power converters, the apparatus comprising: a first single shot circuit to, during runtime of a power converter, generate a clock signal based on an adaptive delay, the adaptive delay based on a count value of a counter; a pulse comparator coupled to an adaptation pulse generator, the pulse comparator to, during runtime of the power converter: compare a first duration of the adaptation pulse to a second duration of a reference pulse; and adjust the count value of the counter; and a ready detector coupled to the pulse comparator, the ready detector to, in response to a trigger event, transmit, during runtime of the power converter, the count value to a second single shot circuit.
    Type: Grant
    Filed: May 31, 2019
    Date of Patent: January 25, 2022
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Janne Matias Pahkala, Juha Olavi Hauru, Jussi Matti Aleksi Särkkä
  • Patent number: 11218105
    Abstract: A motor-drive system may include a rectifier, a metal-oxide varistor (MOV) assembly, and an inverter. The rectifier may generate a direct current (DC) voltage based on a first voltage received from at least one supply voltage line coupled to a voltage source. The MOV assembly may include at least two metal-oxide varistors (MOVs) respectively coupled to the at least one supply voltage lines. The MOV assembly may couple between the voltage source and the rectifier. The motor-drive system may also include a permanently-installed jumper to couple at least one MOV of the at least two MOVs of the MOV assembly to a system ground. The inverter of the motor-drive system may convert the DC voltage to an alternating current (AC) voltage, which may be provided to a load of the motor-drive system.
    Type: Grant
    Filed: January 25, 2019
    Date of Patent: January 4, 2022
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Xuechao Wang, Bora Novakovic, Rangarajan M. Tallam
  • Patent number: 11210191
    Abstract: A device, which may be embedded in a power distribution enclosure, enables analysis of the conditions of an electromechanical machine operating on a commonly supplied network with other electromechanical machines. The analysis preferably uses aggregate operating voltage and current signals supplied to or from such machines along with known changes in steady-state conditions of one or more machines to discern the discrete effect of one or more machines to the aggregate electrical signal. Such discrete effect can then be associated with the operating performance of the individual machine. And, since such voltage and current signals are normally readily available at the enclosure, wiring or any other communication means to any sensors on the electromechanical machines or devices are not necessary. The embedded device may optionally receive or transmit information to a computing or monitoring device remote from the enclosure.
    Type: Grant
    Filed: June 8, 2020
    Date of Patent: December 28, 2021
    Assignee: Fischer Block, Inc.
    Inventors: Gregory R. Wolfe, Margaret P. Paietta
  • Patent number: 11211893
    Abstract: A UVW-phase inverter control circuit has a control function of generating a UVW-phase inverter control signal. An XYZ-phase inverter control circuit has a control function of generating an XYZ-phase inverter control signal. The control function of the UVW-phase inverter control circuit is stopped during execution of a BIST. A phase conversion unit generates a UVW-phase inverter control signal by phase conversion for the control signal from the XYZ-phase inverter control circuit. During execution of the BIST by the UVW-phase inverter control circuit, a selector outputs the inverter control signal from the phase conversion unit as a UVW-phase inverter control signal, and a selector outputs the inverter control signal from the XYZ-phase inverter control circuit as an XYZ-phase inverter control signal.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: December 28, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Takumi Hoshi
  • Patent number: 11183956
    Abstract: An electric propulsion system includes a prime mover, a starter-motor generator configured to be driven by the prime mover to generate electric power, and an electric propulsion motor, and an integrated generator-motor controller arranged to control the supply of the electric power to the electric propulsion motor in response to a control signal, wherein the integrated generator-motor controller includes an active rectifier configured in a first mode to feed-forward to the starter-motor generator a power demand parameter associated with the control signal so as to control the power output of the starter-motor generator in order to start the prime mover.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: November 23, 2021
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Mustansir Kheraluwala, Tadashi Sawata, Michael C. Harke
  • Patent number: 11114964
    Abstract: A method for determining a direct inductance and a quadrature inductance of an electrical machine is included. The method includes controlling the electrical machine so that a stator generates a first magnetic field rotating at a first rotation frequency to rotationally drive a rotor of the electrical machine, and a second magnetic field that varies periodically at a second frequency for measuring a portion of the phase currents flowing through the stator windings of the electrical machine during controlling of the electrical machine. The method further includes determining an amplitude spectrum of a given electrical quantity determined based on a portion of the phase currents, searching in the amplitude spectrum for a peak present at a frequency that is dependent on the second frequency, determining an amplitude of each peak found, and determining the direct inductance and the quadrature inductance from the amplitudes of two peaks found.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: September 7, 2021
    Assignee: VALEO SYSTEMES DE CONTROLE MOTEUR
    Inventors: Wided Zine, Antoine Bruyere, Pierre-Alexandre Chauvenet
  • Patent number: 11114957
    Abstract: A vacuum pump and a motor controller that make a safe transition to a regeneration mode while avoiding an overvoltage are provided. A turbo molecular pump includes a power supply unit that converts alternating-current power to direct-current power and outputs the power, the alternating-current power being obtained from an alternating-current power supply, and the motor controller that controls a motor.
    Type: Grant
    Filed: August 24, 2018
    Date of Patent: September 7, 2021
    Assignee: Edwards Japan Limited
    Inventor: Kou Sato
  • Patent number: 11081988
    Abstract: A data storage device is disclosed comprising a head actuated over a disk, and a spindle motor configured to rotate the disk. A pulse width modulated (PWM) control signal is generated having a frequency based on a PWM clock, the spindle motor is controlled using the PWM control signal, and a frequency of the PWM clock is swung between a minimum frequency and a maximum frequency at a swing rate.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: August 3, 2021
    Assignee: Western Digital Technologies, Inc.
    Inventor: Jaesoo Byoun
  • Patent number: 11074378
    Abstract: A computer program causes a computer to execute processing of simulating behavior of an electromagnetic component including a coil at each of a plurality of time points based on an analytic model of the electromagnetic component. The processing comprises creating a look-up table storing a flux linkage of the coil, an inductance of the coil and a current in the coil that are obtained by a magnetic field analysis based on the analytic model in association with one another, and simulating behavior of the electromagnetic component by referring to the look-up table using currents in the coil calculated at a previous simulation step and at a step before the previous simulation step.
    Type: Grant
    Filed: November 17, 2020
    Date of Patent: July 27, 2021
    Assignee: JSOL Corporation
    Inventors: Takashi Yamada, Koji Tani
  • Patent number: 11056988
    Abstract: A waveform control unit outputs a signal for driving a brushless DC motor by intermediate value energization to a waveform output unit, and outputs a signal for driving a brushless DC motor by sine wave energization to the waveform output unit when the signal in which the rotation position of the rotation reference is detected is acquired from the element, and the waveform control unit applies voltage corresponding to a sine value of an angle of a winding of one phase of n-phase windings when the brushless DC motor is to be driven by intermediate value energization, and outputs a signal for applying voltage corresponding to a sine value of an angle having similar phase difference as the sine wave energization drive with respect to the angle to the rest of the windings.
    Type: Grant
    Filed: March 2, 2020
    Date of Patent: July 6, 2021
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Shunpei Fujii
  • Patent number: 11014254
    Abstract: The present invention is directed to a hair cutting apparatus (600), such as a shaver, which is enabled to detect whether hair is currently being cut in a robust way. Such apparatus has a motor (102) for driving a cutting element. The motor current (106) is evaluated by filtering and amplifying it in such a way that a time derivative of the motor current (106) is processed and other parts of the motor current (106), such as noise and DC-5 parts, are eliminated. An evaluator determines whether the time derivative of the motor current is above a predefined threshold value.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: May 25, 2021
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventor: Jeroen Christian Nijdam
  • Patent number: 10992243
    Abstract: A system and computer-implemented method for reducing an angle error in an estimated position of a rotor over various loads on an electric motor or type of electric motor. Electrical parameters of an electric motor are measured, a true rotor position is found, and sensorless gains based on the measured parameters are generated, including determining a sensorless angle. Data is gathered at multiple torque levels for at least one speed of the motor, including for each torque level, trying different inductance values, and determining an inductance value that results in an angle error of zero. The angle error is the difference between the true rotor position and the sensorless angle. The inductance value that results in an angle error of zero for each speed may be saved in an electronic memory and used to better control the motor or other motors of the same type.
    Type: Grant
    Filed: January 15, 2020
    Date of Patent: April 27, 2021
    Assignee: Nidec Motor Corporation
    Inventors: Bret S. Clark, Christopher D. Schock, Michael I. Henderson
  • Patent number: 10967954
    Abstract: One object is to reduce a volume occupied by a device disposed in a first space spatially limited to a large degree. An electric actuator diving and controlling device is provided with a drive unit positioned in a first space in a piece of equipment and configured to apply power to an electric actuator and a control unit positioned in a second space in the piece of equipment and configured to transmit, to the drive unit, a power command signal including information related to power to be applied to the electric actuator. The first space having the drive unit positioned therein is limited compared with the second space having the control unit positioned therein.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: April 6, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Shingo Nakagawa, Kazushige Nakajima, Takayuki Jinno
  • Patent number: 10948881
    Abstract: Timepiece movement fitted with an electromagnetic transducer comprising at least one coil and a rotor formed of a central shaft, of two magnetic plates that are mounted on the central shaft and of a plurality of bipolar magnets which are axially polarized and mounted on at least one of the two magnetic plates, said at least one coil penetrating at least partially into a circular space which is defined by the rotor between its two magnetic plates and left free by this rotor. The central shaft comprises a pinion which engages with a wheel of the timepiece movement, this pinion being arranged between the two magnetic plates and said wheel being partially arranged between the two magnetic plates, in an angular sector of the circular space that is left free by the electromagnetic transducer, so as to engage with the pinion. Advantageously, said wheel has a roller that is almost or entirely non-conductive and a non-magnetic staff.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: March 16, 2021
    Assignee: The Swatch Group Research and Development Ltd
    Inventors: Jean-Jacques Born, Yvan Ferri
  • Patent number: 10903776
    Abstract: An industrial electrical machine includes a stator; a rotor in magnetic communication with the stator; a plurality of windings disposed in the rotor and/or the stator; and an embedded solid state controller. The solid state controller is operative to control the operation of the industrial electrical machine. The solid state controller includes a power semiconductor switching device coupled to the plurality of windings, and includes a communication interface. The power semiconductor switching device is operative to provide switching during operation of the industrial electrical machine, and is operative to turn the electrical machine on and to turn the electrical machine off in response to a control input received by the communication interface.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: January 26, 2021
    Assignee: ABB Schweiz AG
    Inventors: Pietro Cairoli, Lorenzo Mazza, Zhiguo Pan
  • Patent number: 10889011
    Abstract: An actuator, a robot arm and a robot are disclosed. The actuator includes: a motor, including a housing, a motor stator and a motor rotor, wherein the motor stator is disposed to the housing, the motor rotor is rotatably connected to the housing, and the motor rotor covers the motor stator; a position encoder, disposed to the motor rotor; a reducer, connected to the motor rotor, and configured to adjust a rotation speed output from the motor rotor; and a motor driver, disposed on the housing, and electrically connected to the motor.
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: January 12, 2021
    Assignee: INNFOS DRIVE (BEIJING) TECHNOLOGIES CO., LTD.
    Inventors: Haotian Cui, Xunge Yan
  • Patent number: 10890192
    Abstract: A fan comprising: (a) an impeller, (b) a motor connected to the impeller so that during operation the motor drives the impeller to move a fluid; (c) an instrumentation assembly that includes one or more components for controlling one or more operations of the fan; (d) an interface in communication with the instrumentation assembly; wherein the interface is configured so that one or more programs, one or more signals, or both can be input into the fan after a final assembly of the fan so that the fan can be configured to perform a desired function at the time of installation into a final product, reconfigured for a different purpose than originally programmed, or both.
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: January 12, 2021
    Assignee: MDR ARCOM LLC
    Inventors: Fred A. Brown, Kenneth Hoffman
  • Patent number: 10833612
    Abstract: An electric working machine includes an inverter and a controller. The controller switches a current conduction pattern via the inverter and performs a PWM control of a conduction current to a brushless motor. The controller includes switching patterns as the current conduction pattern switched for every commutation timing. The switching patterns include different on and off states for different switching elements. The controller sequentially switches a switching pattern synchronously with a period of the PWM control, detects a rotational position of a brushless motor from a magnitude relation between inductances of the brushless motor produced by switching the switching pattern, and sets the commutation timing.
    Type: Grant
    Filed: March 14, 2019
    Date of Patent: November 10, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Masumi Nishimura, Yoshiteru Ito
  • Patent number: 10833598
    Abstract: A power conversion device includes: a rectifying unit rectifying an AC voltage output from an AC power supply; a booster circuit boosting an output voltage of the rectifying unit; a control unit causing the booster circuit to perform synchronous rectification; and a smoothing capacitor smoothing an output voltage of the booster circuit. The booster circuit is constituted by connecting a plurality of chopper circuits in parallel to each other, the chopper circuits each including an upper arm switching element and a lower arm switching element connected in series to a reactor connected to the rectifying unit, and the control unit generates a drive pulse causing the upper arm switching element to be turned on when a reverse current flows through the upper arm switching element.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: November 10, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shigeo Umehara, Takuya Shimomugi, Takashi Yamakawa
  • Patent number: 10819257
    Abstract: Systems and methods for computing an average supply current to a motor include a current sensor that is configured to sense a current through the motor. A converter is configured to sample the output of the current sensor at times that are established by a trigger signal and convert the samples into digital current values. A trigger signal generator generates the trigger signal based on one or more pulse width modulated (PWM) motor control signals within a PWM cycle. An average supply current value that indicates the average supply current to the motor is computed by a controller using the digital current values received from the converter.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: October 27, 2020
    Assignee: Allegro MicroSystems, LLC
    Inventors: Kamyar Khosravi, Masahira Kurihara, Andrew Adib, Robert D. Christie
  • Patent number: 10812006
    Abstract: A motor drive device can include: a control circuit configured to adjust each phase current of a three-phase inverter of a motor; where the phase current of the three-phase inverter rises from zero to a first threshold during a first time interval; and where the phase current is controlled to drop gradually from the first threshold to zero during a second time interval in order to increase the second time interval.
    Type: Grant
    Filed: January 16, 2019
    Date of Patent: October 20, 2020
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Xiaodong Huang, Lei Shen
  • Patent number: 10784810
    Abstract: A motor control system for reducing or eliminating current ripple error during current sampling comprises a motor having a plurality of phase coils, a motor driver circuit having a plurality of switches coupled to the plurality of phase coils to drive current through the phase coils, and a motor controller circuit configured to provide a plurality of output control signals coupled to the plurality of switches. A phase circuit modifies a first output control signal to produce a modified control signal that is out of phase with a second output control signal. A current measuring circuit is included to measure a current through the motor by measuring the current during a first time period when the first output control signal is active and measuring the current during a second time period when the modified control signal is active.
    Type: Grant
    Filed: April 29, 2019
    Date of Patent: September 22, 2020
    Assignee: Allegro MicroSystems, LLC
    Inventor: Yisong Lu
  • Patent number: 10784798
    Abstract: A power converting apparatus and a home appliance having the same according to the present invention includes: an input unit including an AC connection unit which receives an alternating current (AC) power from an external and a DC connection unit which receives a direct current (DC) power; a bridge diode unit which always outputs the DC power having a given polarity when DC power is connected to the input unit, and rectifies the AC power received through the input unit when the DC power is connected to the input unit; and a capacitor which is connected to a DC terminal which is an output terminal of the bridge diode unit.
    Type: Grant
    Filed: April 4, 2019
    Date of Patent: September 22, 2020
    Assignee: LG ELECTONICS INC.
    Inventor: Youngho Hong
  • Patent number: 10734928
    Abstract: A signal conditioning apparatus includes a timing extractor to received one or more stepper motor drive signal and convert each into a corresponding virtual quadrature trigger signal. A resolution scaler is coupled to an output of the timing extractor to scale the virtual quadrature trigger signals to adjust the transition frequency, thereby adjusting the resolution of an image captured by a camera receiving the trigger signals to be different than the print resolution created by the motor drive signals. A quadrature decoder is coupled to the output of the resolution scaler, wherein the quadrature decoder extracts timing and direction information from the virtual quadrature trigger signals received from the resolution scaler.
    Type: Grant
    Filed: March 30, 2019
    Date of Patent: August 4, 2020
    Assignee: Omron Corporation
    Inventors: Siddharth Sood, Donald Broadbent, Jesse Kolstad, David Naddor
  • Patent number: 10734936
    Abstract: A motor control device includes: a noise reduction unit that sets a PWM count in units of PWM cycles for each PWM cycle in a current control cycle such that a current that flows through a frame ground because of a phase voltage for any one of three phases is canceled out with a current that flows through the frame ground because of a phase voltage for one of the two other phases in each PWM cycle in the current control cycle; and a noise canceling circuit configured to generate a current that is opposite in phase to a current that flows through the frame ground because of a phase voltage for the other of the two other phases in each PWM cycle in the current control cycle.
    Type: Grant
    Filed: April 26, 2019
    Date of Patent: August 4, 2020
    Assignee: JTEKT CORPORATION
    Inventors: Hiroshi Sumasu, Koichiro Matsuhisa
  • Patent number: 10727771
    Abstract: In order to shorten an activation time while realizing stable motor control, a motor control apparatus operable to control a motor is provided. The apparatus controls so as to drive the motor by the forced commutation control in a duration from a start of control of the motor until a first time period elapses, and control so as to drive the motor by the vector control after the first time period has elapsed. In addition, the apparatus controls an execution frequency of a current detection and a rotation speed estimation. The apparatus controls so that a first execution frequency in a second time period after a switch is made from driving by the forced commutation control to driving by the vector control is greater than a second execution frequency in a third time period subsequent to the second time period.
    Type: Grant
    Filed: April 5, 2019
    Date of Patent: July 28, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Koji Kawamura
  • Patent number: 10680500
    Abstract: A system and method for wirelessly communicating with an HVAC motor or other motor in order to manage the motor with regard to, e.g., identifying a suitable replacement for, programming, monitoring and/or diagnosing, and/or tuning or otherwise reprogramming the motor without physically connecting to the motor. A technician uses a software application on a smartphone, tablet, or other portable device to communicate with the motor controller via a wireless communication device incorporated into the motor assembly. The smartphone may receive relevant information, such as identification, programming, or diagnostic information, and process the information or wirelessly transmit the information to a server for processing. Based on the information, the smartphone may transmit programming instructions to the motor controller via the wireless communication device. Further, the wireless communication device may transmit sensor data associated with the motor to allow for monitoring the motor's performance.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: June 9, 2020
    Assignee: Nidec Motor Corporation
    Inventors: Prakash B. Shahi, Christopher D. Schock, Randy L. Bomkamp, Anandan C. Velayutham
  • Patent number: 10666182
    Abstract: A control system for a rotary electric machine includes a controller configured to generate dynamic input current data based upon a dynamic analysis of self flux data, mutual flux data, and saturation scaling factor data. Upon generating a torque request, the controller is configured to determine a desired electrical input based upon the dynamic input current data to generate the desired output torque. The desired electrical input includes a magnitude and duration of an electrical pulse and a desired angular position of the rotor of the rotary electric machine relative to the stator of the machine. The controller determines an angular position of the rotor and generates an operating command to generate the desired electrical input at the desired angular position of the rotor to propel the rotary electric machine and generate the desired output torque. A rotary electric machine and method of operating same are provided.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: May 26, 2020
    Assignee: Caterpillar Inc.
    Inventors: Carlos E. Nino Baron, Ahmed Khalil, Jackson Wai, Jesse R. Gerdes, Sangameshwar Sonth, Amir Saad
  • Patent number: 10637376
    Abstract: A device and a method for automatically detecting an initial position of a rotor of a motor are provided. The device includes an initial position detector, a lookup table module and a controller. The initial position detector detects input voltages of the motor. The controller compares the input voltages with each other to determine the initial position of the rotor of the motor. The controller obtains a waveform pattern from the lookup table module to construct an activating waveform signal to be outputted to one of steps of the motor that corresponds to the initial position of the rotor to control the motor to run.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: April 28, 2020
    Assignee: ANPEC ELECTRONICS CORPORATION
    Inventor: Ming-Jung Tsai
  • Patent number: 10615723
    Abstract: A multi-phase brushless DC motor driving circuit includes a driving-stage circuit, a PWM generator, a control circuit and a plurality of current detection circuits. The driving-stage circuit includes a plurality of sub-driving circuits each having a high-side transistor and a low-side transistor. The current detection circuits detect the current at a node between the high-side transistor and the low-side transistor of the corresponding sub-driving circuit, and then generate a current detection signal. According to the current detection signals, the control circuit controls the PWM generator to generate a plurality of PWM signals for controlling the conducting and cutting off of the high-side transistor and the low-side transistor of each sub-driving circuit, and to provide a driving current to drive a multi-phase brushless DC motor.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: April 7, 2020
    Assignee: ENERGIC TECHNOLOGIES CORP.
    Inventors: Chien-Ming Sun, Sheng-Hung Lin, Yi-Ting Ko
  • Patent number: 10581359
    Abstract: An output torque calculation device and a method thereof is provided, and the output torque calculation device includes a first sensor, a second sensor, a rotor, a reducer, a processor, and an elastic device. An input portion of the reducer and an output portion of the reducer are respectively connected to the rotor and an input portion of the elastic device, and an output portion of the elastic device is configured to connect to a load. The output torque calculation method comprises: detecting a first angle of the rotor by the first sensor; detecting a second angle of the output portion of the elastic device by the second sensor; and calculating a torque carried by a final output end of the output torque calculation device by the processor according to the first angle and the second angle.
    Type: Grant
    Filed: December 27, 2018
    Date of Patent: March 3, 2020
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Chun-An Lin, Hsi-Chih Chang, Hsin-Hung Chou, Wen-Che Shen, Kuan-Jung Lin
  • Patent number: 10530209
    Abstract: One example device includes a rotor platform that rotates about an axis of rotation. The device also includes a ring magnet mounted to the rotor platform to provide a rotor-platform magnetic field. The device also includes a stator platform that includes a planar mounting surface. The device also includes a plurality of conductive structures disposed along the planar mounting surface. The conductive structures remain within a predetermined distance to the ring magnet in response to rotation of the rotor platform about the axis of rotation. The conductive structures are electrically coupled to define an electrically conductive path that at least partially overlaps the ring magnet. The device also includes circuitry that causes an electrical current to flow through the conductive path. The electrical current generates a stator-platform magnetic field that interacts with the rotor-platform magnetic field such that the rotor platform rotates about the axis of rotation.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: January 7, 2020
    Assignee: Waymo LLC
    Inventors: Paul Karplus, Seth Michael LaForge
  • Patent number: 10523138
    Abstract: A motor control device includes: a state monitoring unit that detects a power supply abnormality in which a power is not normally supplied to at least one of a rotation sensor and a motor; an abnormality determination unit that detects an abnormality of the rotation sensor based on an output signal of the rotation sensor; and a decision unit that decides whether to confirm the abnormality of the rotation sensor based on a detection result of the state monitoring unit and a detection result of the abnormality determination unit. When the state monitoring unit detects the power supply abnormality, the decision unit does not decide the abnormality of the rotation sensor even when the abnormality determination unit detects the abnormality of the rotation sensor.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: December 31, 2019
    Assignee: DENSO CORPORATION
    Inventors: Hiromitsu Nagata, Seiji Nakayama, Jun Yamada
  • Patent number: 10511244
    Abstract: To improve identification precision of a motor constant that controls a motor by vector control. A parameter identifier sets an offset voltage of a DC component as a first d-axis target voltage, and detects a d-axis current that flows accordingly as an offset current. The parameter identifier also sets a voltage obtained by superimposing an identification signal of a predetermined AC component on the first d-axis target voltage as a second d-axis target voltage, and detects the d-axis current that flow accordingly. The parameter identifier then identifies the motor constant using a voltage obtained by subtracting the first d-axis target voltage from the second d-axis target voltage and a current obtained by subtracting the offset current from the d-axis current as inputs.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: December 17, 2019
    Assignee: Renesas Electronics Corporation
    Inventor: Takahito Ishino
  • Patent number: 10498277
    Abstract: A drive system of an embodiment includes an inverter for driving an electric motor; a detector that detects an electric current value output from the inverter; command generators that generate an electric current command value corresponding to an electric current to be supplied to the electric motor and a gate command of the inverter so that the electric current command value matches the electric current value; calculators that calculate an voltage target vector of the inverter and a rotation phase estimation value of the electric motor based on the electric current value and the voltage target vector, in an initial estimation of when activating the inverter. The electric current command value in the initial estimation is a value to supply an electric current for magnetically saturating a rotor of the electric motor, and a dynamic inductance of the electric motor used for calculating the rotation phase estimation value is a value of when the rotor of the electric motor is magnetically saturated.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: December 3, 2019
    Assignees: KABUSHIKI KAISHA TOSHIBA, Toshiba Infrastructure Systems & Solutions Corporation
    Inventors: Tomoaki Shigeta, Shun Taniguchi, Kentaro Suzuki, Kazuaki Yuuki
  • Patent number: 10467892
    Abstract: According to one aspect, a method includes obtaining a first signal from a host at an air mover system, the air mover system including an air mover and a tachometer, the tachometer having an associated tachometer signal. The method also includes determining whether the first signal is a request for information associated with the air mover, and providing the information from the air mover system to the host on the associated tachometer signal when it is determined that the first signal is the request for information associated with the air mover.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: November 5, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Niels-Peder Mosegard Jensen, Phong Hoang Ho, Robert Vincent Grimes
  • Patent number: 10447187
    Abstract: A control circuit controls the operation of a brushless DC (BLDC) sensorless motor having a first terminal connected to a first winding, a second terminal connected to a second winding and a third terminal connected to a third winding. A driver circuit applies drive signals to the first and second terminals and places the third terminal in a high-impedance state. The drive signals include first drive signals at a first current amplitude and second drive signals at a second, different, current amplitude. A differencing circuit senses a first mutual inductance voltage at the third terminal in response to the first drive signals and senses a second mutual inductance voltage at the third terminal in response to the second drive signals. The differencing circuit further determines a difference between the first and second mutual inductance voltages and produces a difference signal that is used for zero-crossing detection and rotor position sensing.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: October 15, 2019
    Assignee: STMicroelectronics S.r.l.
    Inventors: Michele Boscolo Berto, Siro Vittoni
  • Patent number: 10432115
    Abstract: A motor driving control apparatus in embodiments includes: a first signal generator to generate a first signal representing any one rotation angle section of plural rotation angle sections according to a sensor signal that changes every predetermined rotation angle of a rotor; a measurement unit to measure a period of each of the rotation angle sections; a prediction unit to predict a period of a next rotation section based on one or plural measured rotation angle sections; a second signal generator to generate a second signal representing a relative rotation angle of the rotor in the next rotation angle section for each period obtained by dividing the predicted period by a predetermined number; and a third signal generator to generate a third signal corresponding to a rotation angle of the rotor based on the first and second signals.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: October 1, 2019
    Assignees: MICROSPACE CORPORATION, TAIYO YUDEN CO., LTD.
    Inventors: Masato Tanaka, Hiromi Hagiwara, Kazuo Asanuma, Hirokazu Shirakawa
  • Patent number: 10432128
    Abstract: A frequency converter is used for generating at least one frequency converter output voltage a prescribable frequency converter output voltage amplitude and a prescribable frequency converter output voltage frequency for an electric motor. The frequency converter has: a clocked DC/DC converter is designed to generate from an input direct voltage having an input voltage level a DC/DC converter output voltage having a DC/DC converter output voltage level, wherein the DC/DC converter is designed to generate the DC/DC converter output voltage level based on the prescribable frequency converter output voltage amplitude, and a clocked inverter having a number of controllable switches, to which inverter the DC/DC converter output voltage is applied and which actuates the switches with an inverter switching frequency such that the at least one frequency converter output voltage with the prescribable frequency converter output voltage frequency is generated from the DC/DC converter output voltage.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: October 1, 2019
    Assignee: Schmidhauser AG
    Inventor: Dirk Schekulin
  • Patent number: 10425033
    Abstract: It is an aspect of the present disclosure to provide a motor driving apparatus, and a method of controlling the same. In accordance with one aspect of the present disclosure, the motor driving apparatus includes an inverter configured to supply driving power to a motor; a sensing unit configured to sense a DC voltage supplied to the inverter and a driving current supplied from the inverter to the motor; and a controller configured to compensate for an iron loss and a copper loss by calculating a loss of the motor based on the sensed DC voltage and driving current and controlling the inverter to adjust the driving current based on the calculated loss of the motor.
    Type: Grant
    Filed: January 4, 2016
    Date of Patent: September 24, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jong Hyun Shin, Sun Jin Kim, Jin Han Kim
  • Patent number: 10425024
    Abstract: A brushless motor device including: a rotor; a stator including a first coil, a second coil and a third coil, first ends of which are Y-connected to each other; a motor driver including an inverter circuit including switching elements and configured to: switch ON and OFF states of each switching element of the inverter circuit, wherein by switching the ON and OFF states of each switching element of the inverter circuit, the motor driver is configured to switch an energization time period from a first time period in which current is caused to flow from the first coil to the third coil to a second time period in which current is caused to flow from the second coil to the third coil and set both voltages of second ends of the second coil and the third coil to a power supply voltage during the second time period.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: September 24, 2019
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Hironori Hirata, Kohei Kanehara
  • Patent number: 10401197
    Abstract: An apparatus and method are provided for compensating for a position error of a resolver that compensates for positions in the overall speed range using resolver position error measured at a specific speed by providing an angle tracking observer (ATO) for calculating angle information. The ATO compensates for the position errors in the overall speed range based on the position errors measured at the specific speed, to an inside of a resolver-digital converter. The method includes digitalizing detected position information of the motor rotor and receiving the digitalized position information from a resolver-digital converter to measure the position error. An electrical angular velocity of the position error is determined and the position error at the electrical angular velocity 0 is calculated and stored. The position error at a current electrical angular velocity is converted into and compensated for using the calculated position error based on the current electrical angular velocity.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: September 3, 2019
    Assignee: Hyundai Motor Company
    Inventors: Joo Young Park, Han Hee Park, Tae Il Yoo, Byung Hoon Yang, Chin Wook Paek, Hyung Bin Ihm
  • Patent number: 10396702
    Abstract: A motor drive control device is a device which drives and controls a permanent magnet synchronous motor in which each phase is independently controlled, and includes a 0-axis current calculation unit which calculates and outputs a 0-axis current iz on the basis of a motor current; a 0-axis current determination unit which compares and determines a reference 0-axis current value izs, which is the 0-axis current value when the temperature of a permanent magnet provided in the permanent magnet synchronous motor is a reference temperature with the calculated 0-axis current iz; and a switching signal generation unit which drives and controls inverters on the basis of the result of comparison determination of the 0-axis current determination unit.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: August 27, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Katsuhiro Hoshino, Toshisada Mitsui, Seigo Yukutake, Hideki Miyazaki
  • Patent number: 10348235
    Abstract: A motor control unit includes a PWM count changer that when, out of all possible combinations of any two of three phases, at least one of the combinations has a difference in PWM count less than a threshold value, changes a PWM count of at least one of the two phases of the at least one of the combinations for each of PWM periods within a current control period, without changing the total of the PWM counts of the at least one of the two phases within the current control period, such that each of the combinations has a difference in PWM count greater than or equal to the threshold value.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: July 9, 2019
    Assignee: JTEKT CORPORATION
    Inventor: Hiroshi Sumasu
  • Patent number: 10326380
    Abstract: A motor drive apparatus includes: a converter which converts AC power to DC power and to output the DC power to a DC link; an inverter including power devices which converts the DC power to AC power for driving a motor; a capacitor provided in the DC link; a shut-off circuit to open and close an electrical path between the AC power source and the converter; a constant current control unit which performs control in such a manner as to allow a constant current supplied by the capacitor to pass through a detection target power device among the power devices in the inverter; and an abnormality detection unit which detects an abnormality in the detection target power device based on changes in voltage between a collector and an emitter of the detection target power device during a period in which the constant current passes through the detection target power device.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: June 18, 2019
    Assignee: FANUC CORPORATION
    Inventor: Shinichi Mizukami