Patents by Inventor Anno YOO

Anno YOO has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210099123
    Abstract: A method, system, and apparatus for controlling and regulating operation of a permanent magnet rotary electric machine including a stator and a rotor includes determining a first reactive power term associated with the electric machine based upon voltage, and determining a second reactive power term associated with the electric machine based upon flux. A first motor temperature associated with the electric machine is determined based upon the first and second reactive power terms, and power output from the permanent magnet electric machine is controlled based upon the first motor temperature.
    Type: Application
    Filed: October 1, 2019
    Publication date: April 1, 2021
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Anno Yoo, Daniel J. Berry, Young J. Kim
  • Publication number: 20210067075
    Abstract: A method for estimating a magnet temperature of a rotor magnet within a rotary electric machine includes, while a rotor of the electric machine is stationary, injecting a high-frequency voltage component onto a control voltage of the electric machine, via a controller, to generate an adjusted voltage command, and extracting a high-frequency component of a resulting current as an extracted high-frequency component. The method also includes calculating an inductance value of the electric machine using the extracted high-frequency component of the resulting current. The magnet temperature is estimated using the calculated inductance value and an angular position of the rotor. The method includes controlling an operation of the electric machine using the estimated magnet temperature. An electric powertrain uses the electric machine and controller noted above.
    Type: Application
    Filed: September 4, 2019
    Publication date: March 4, 2021
    Applicants: GM GLOBAL TECHNOLOGY OPERATIONS LLC, Seoul National University R & DB Foundation
    Inventors: Daniel J. Berry, Anno Yoo, Seung Ki Sul, Hyun-Sam Jung
  • Publication number: 20210021219
    Abstract: A propulsion system having an electric motor and corresponding method. A controller is configured to receive a torque request and selectively command the electric motor. The controller has a processor and tangible, non-transitory memory on which instructions are recorded for a method of generating an auxiliary power. The controller is configured to obtain a desired auxiliary power and a delta factor (?). The delta factor is set as a speed modifier (??=?) when the cosine of an angle (?), between a constant torque unit vector and a decreasing voltage ellipse unit vector, is less than a predefined threshold. A modified rotor speed is obtained as a sum of an original rotor speed and a speed modifier (??).The controller is configured to obtain modified stator current commands based on the modified rotor speed and torque request. The auxiliary power is generated by commanding the modified stator current commands.
    Type: Application
    Filed: July 18, 2019
    Publication date: January 21, 2021
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Siddharth Ballal, Anno Yoo
  • Publication number: 20210010832
    Abstract: A resolver disposed to monitor a rotatable member is described, along with an associated method for evaluating an output signal therefrom. The method for monitoring the resolver includes supplying an excitation signal to the resolver, and monitoring, at an oversampling rate, first and second output signals from the resolver. An oversampling routine is executed to determine averages of the first and second output signals from the resolver. A demodulation angle error is determined based upon the first and second output signals from the resolver, and provided as feedback. A position of the resolver is also determined based upon the first and second output signals from the resolver.
    Type: Application
    Filed: July 9, 2019
    Publication date: January 14, 2021
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Young Joo Lee, Anno Yoo, Milan A. Vadera, Daniel J. Berry
  • Publication number: 20200313586
    Abstract: A method of controlling an interior permanent magnet (IPM) motor includes receiving a motor torque command, and selecting a nominal d-axis current and a nominal q-axis current stored in a first lookup table. The nominal d-axis current and the nominal q-axis current correspond with a predetermined efficiency of the IPM motor at a nominal temperature and are based on at least the motor torque command and magnetic flux at a nominal temperature of the IPM motor. A d-axis adjustment current and a q-axis adjustment current are then selected from a stored second lookup table. The adjustment currents correspond with the predetermined efficiency of the IPM motor and are based at least on the magnetic flux and an operating temperature of the IPM motor. A corrected d-axis current and a corrected q-axis current are commanded. The corrected currents are the sum of the respective nominal current and adjustment current.
    Type: Application
    Filed: March 26, 2019
    Publication date: October 1, 2020
    Applicant: GM Global Technology Operations LLC
    Inventors: Suresh Gopalakrishnan, Anno Yoo, Wesley G. Zanardelli, Yo Chan Son
  • Publication number: 20200228049
    Abstract: An electric motor control system of a vehicle includes a temperature module configured to, based on a motor torque request, (i) determine a plurality of stator current values based on a plurality of temperatures and (ii) generate a maximum stator current based on a lowest value of the plurality of stator current values. A torque module configured to, based on the maximum stator current, the motor torque request, and a maximum allowable flux, generate a maximum torque output. A current command module configured to, based on a speed of a rotor of the electric motor and the maximum torque output, generate a d-axis current adjustment and a q-axis current adjustment. A switching control module configured to, based on the d- and q-axis current adjustments, control switching of an inverter module and apply power to stator windings of the electric motor from an energy storage device.
    Type: Application
    Filed: January 11, 2019
    Publication date: July 16, 2020
    Applicant: GM Global Technology Operations LLC
    Inventors: Anno Yoo, Yo Chan Son, Dwarakanath V. Simili
  • Patent number: 10700632
    Abstract: An electric motor control system of a vehicle includes a temperature module configured to, based on a motor torque request, (i) determine a plurality of stator current values based on a plurality of temperatures and (ii) generate a maximum stator current based on a lowest value of the plurality of stator current values. A torque module configured to, based on the maximum stator current, the motor torque request, and a maximum allowable flux, generate a maximum torque output. A current command module configured to, based on a speed of a rotor of the electric motor and the maximum torque output, generate a d-axis current adjustment and a q-axis current adjustment. A switching control module configured to, based on the B- and q-axis current adjustments, control switching of an inverter module and apply power to stator windings of the electric motor from an energy storage device.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: June 30, 2020
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Anno Yoo, Yo Chan Son, Dwarakanath V. Simili
  • Patent number: 10658963
    Abstract: A method for regulating operation of an induction motor having a rotor includes calculating a rotor flux angle error value, via a flux observer of a controller, using estimated d-axis and q-axis flux values of the rotor, estimating rotor position using a position observer of the controller, and calculating slip position of the rotor using d-axis and q-axis stator currents. The method also includes estimating a rotor flux angle as a function of slip position and estimated rotor position, calculating a corrected rotor flux angle by selectively adding the rotor flux angle error value to the estimated rotor flux angle, and controlling output torque of the motor using the corrected rotor flux angle. A logic switch may be used to selectively add the rotor flux angle.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: May 19, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Anno Yoo, Nathan Minor
  • Publication number: 20200119676
    Abstract: A method regulates operation of an induction motor by generating d-axis and q-axis current command references, and generating a current compensation value using a modulation index and an actual/feedback modulation index. An angle (?) is derived between constant torque direction and decreasing voltage ellipse unit vectors, with separate d-axis and q-axis components of the current compensation value also derived. A direction of compensation is determined using angle (?). The direction is that of the constant torque unit vector when cos ? exceeds a calibrated threshold, and in the direction of the decreasing voltage ellipse unit vector otherwise. The d-axis and q-axis components are added to the d-axis and q-axis current command references in the determined direction to derive final d-axis and q-axis current commands, which are used to control motor torque. An electric system and motor vehicle include the controller.
    Type: Application
    Filed: October 15, 2018
    Publication date: April 16, 2020
    Applicant: GM Global Technology Operations LLC
    Inventors: Siddharth Ballal, Anno Yoo
  • Publication number: 20200114900
    Abstract: A current command module is configured to, based on a motor torque request for an electric motor of the vehicle, generate a first d-axis current command for the electric motor and a first q-axis current command for the electric motor. An adjusting module is configured to: generate a second d-axis current command for the electric motor by adjusting the first d-axis current command based on a d-axis current adjustment; and generate a second q-axis current command for the electric motor by adjusting the first q-axis current command based on a q-axis current adjustment. An adjustment module is configured to, when a rotational speed of the electric motor is greater than a predetermined speed: determine a scalar value based on the second d-axis current command and the second q-axis current command; and determine the d and the q-axis current adjustments based on multiplying a flux error with the scalar value.
    Type: Application
    Filed: October 12, 2018
    Publication date: April 16, 2020
    Applicant: GM Global Technology Operations LLC
    Inventors: Kibok LEE, Dwarakanath V. SIMILI, Anno YOO
  • Publication number: 20200119680
    Abstract: A method for regulating operation of an induction motor having a rotor includes calculating a rotor flux angle error value, via a flux observer of a controller, using estimated d-axis and q-axis flux values of the rotor, estimating rotor position using a position observer of the controller, and calculating slip position of the rotor using d-axis and q-axis stator currents. The method also includes estimating a rotor flux angle as a function of slip position and estimated rotor position, calculating a corrected rotor flux angle by selectively adding the rotor flux angle error value to the estimated rotor flux angle, and controlling output torque of the motor using the corrected rotor flux angle. A logic switch may be used to selectively add the rotor flux angle.
    Type: Application
    Filed: October 10, 2018
    Publication date: April 16, 2020
    Applicant: GM Global Technology Operations LLC
    Inventors: Anno Yoo, Nathan Minor
  • Patent number: 10601348
    Abstract: A switching module switches between receiving a first output from a sensor and a second output from a sensor-less position detection module each indicating a rotor position error of a motor. A position determining module determines a rotor position of the motor based on an output of the switching module and generates a control signal to control a parameter of the motor. A sample and hold module operates on a sum of the output of the switching module and an output of the sample and hold module from a prior instance of switching between the first and second outputs. The position determining module scales the output of the sample and hold module using first and second gains to generate first and second scaled outputs, and generates the control signal based on the output of the switching module and the first and second scaled outputs.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: March 24, 2020
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: David S. Ochs, Anno Yoo, Kibok Lee
  • Patent number: 10461678
    Abstract: Methods and systems for applying adaptive thermal compensation when operating a rotor of a motor are provided. The method includes: receiving a plurality of parameter data of torque and temperature of the rotor and current and voltage of the motor by a region determination module; calculating, by the region determination module from the set of parameter data, a cosine value to determine a region for applying the adaptive thermal compensation wherein the cosine value is calculated from a constant torque direction vector and a voltage limit eclipse vector derived from a functional relationship of the one or more parameter data; and applying, by a reference modification module, a modification value to incrementally modify the motor current when the motor is operating within the region determined by the region determination module for the adaptive thermal compensation.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: October 29, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Anno Yoo, Siddharth Ballal
  • Patent number: 10424945
    Abstract: Disclosed embodiments relate to a control method of an energy management and more particularly, to an energy management system which is capable of reflecting a state of each energy storage system in the energy management system.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: September 24, 2019
    Assignee: LSIS CO., LTD.
    Inventor: Anno Yoo
  • Publication number: 20190288625
    Abstract: Methods and systems for applying adaptive thermal compensation when operating a rotor of a motor are provided. The method includes: receiving a plurality of parameter data of torque and temperature of the rotor and current and voltage of the motor by a region determination module; calculating, by the region determination module from the set of parameter data, a cosine value to determine a region for applying the adaptive thermal compensation wherein the cosine value is calculated from a constant torque direction vector and a voltage limit eclipse vector derived from a functional relationship of the one or more parameter data; and applying, by a reference modification module, a modification value to incrementally modify the motor current when the motor is operating within the region determined by the region determination module for the adaptive thermal compensation.
    Type: Application
    Filed: March 19, 2018
    Publication date: September 19, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Anno Yoo, Siddharth Ballal
  • Publication number: 20190229653
    Abstract: A switching module switches between receiving a first output from a sensor and a second output from a sensor-less position detection module each indicating a rotor position error of a motor. A position determining module determines a rotor position of the motor based on an output of the switching module and generates a control signal to control a parameter of the motor. A sample and hold module operates on a sum of the output of the switching module and an output of the sample and hold module from a prior instance of switching between the first and second outputs. The position determining module scales the output of the sample and hold module using first and second gains to generate first and second scaled outputs, and generates the control signal based on the output of the switching module and the first and second scaled outputs.
    Type: Application
    Filed: January 25, 2018
    Publication date: July 25, 2019
    Inventors: David S. OCHS, Anno Yoo, Kibok Lee
  • Patent number: 10333448
    Abstract: An electric motor control system of a vehicle includes a current command module configured to, based on a motor torque request for an electric motor of the vehicle, generate a first d-axis current command for the electric motor and a first q-axis current command for the electric motor. An adjustment module is configured to, based on a speed of a rotor of the electric motor and the motor torque request, selectively determine at least one of a d-axis current adjustment and a q-axis current adjustment based on a temperature of the rotor of the electric motor. An adjusting module is configured to produce a second d-axis current command for the electric motor by adjusting the first d-axis current command based on the d-axis current adjustment and to produce a second q-axis current command for the electric motor by adjusting the first q-axis current command based on the q-axis current adjustment.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: June 25, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Anno Yoo, Yo Chan Son, Sangyeop Kwak
  • Patent number: 10295599
    Abstract: A method in a motor controller for an electric motor is disclosed. The method includes receiving a motor current measurement, a motor reference voltage or measured voltage, and an estimated temperature from the electric motor, determining a reference flux linkage estimate (?pm,ref) from a lookup table based on the motor current measurement and the estimated temperature, determining a back-EMF (electromotive force) estimate based on the motor current measurement, the motor voltage and the estimated temperature, determining an observed flux linkage estimate (?pm,obs) from the back-EMF estimate, determining a magnetic strength as a ratio of the observed flux linkage estimate to the reference flux linkage estimate, and determining that a rotor magnet has been demagnetized to an unacceptable level when the magnetic strength is below a threshold level.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: May 21, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Gilsu Choi, Anno Yoo, Dwarakanath V. Simili
  • Patent number: 10230318
    Abstract: Disclosed embodiments relate to methods, apparatuses, and systems for estimating parameters of an induction machine. In some embodiments, a method for estimating parameter of an induction machine includes estimating parameters of the induction machine more accurately even when it is stationary by utilizing voltage equations of the induction machine and signal processing techniques, with no additional hardware.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: March 12, 2019
    Assignee: LSIS CO., LTD.
    Inventors: Anno Yoo, Yong-Doo Yoon
  • Publication number: 20190049517
    Abstract: A method in a motor controller for an electric motor is disclosed. The method includes receiving a motor current measurement, a motor reference voltage or measured voltage, and an estimated temperature from the electric motor, determining a reference flux linkage estimate (?pm,ref) from a lookup table based on the motor current measurement and the estimated temperature, determining a back-EMF (electromotive force) estimate based on the motor current measurement, the motor voltage and the estimated temperature, determining an observed flux linkage estimate (?pm,obs) from the back-EMF estimate, determining a magnetic strength as a ratio of the observed flux linkage estimate to the reference flux linkage estimate, and determining that a rotor magnet has been demagnetized to an unacceptable level when the magnetic strength is below a threshold level.
    Type: Application
    Filed: August 11, 2017
    Publication date: February 14, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Gilsu Choi, Anno Yoo, Dwarakanath V. Simili