公开(公告)号：US10295599B2

公开(公告)日：2019-05-21

申请号：US15674804

申请日：2017-08-11

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Gilsu Choi ,  Anno Yoo ,  Dwarakanath V. Simili

IPC: H02P21/08 ,  H02P23/14 ,  H02P25/16 ,  G01R31/34 ,  G01R31/3842 ,  G01R31/367 ,  B60L3/00

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 (λpm,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 (λpm,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.

公开(公告)号：US20190049517A1

公开(公告)日：2019-02-14

申请号：US15674804

申请日：2017-08-11

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Gilsu Choi ,  Anno Yoo ,  Dwarakanath V. Simili

IPC: G01R31/34 ,  G01R31/36 ,  B60L3/00

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 (λpm,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 (λpm,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.

公开(公告)号：US20170077854A1

公开(公告)日：2017-03-16

申请号：US14854171

申请日：2015-09-15

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Yo Chan Son ,  Brian A. Welchko ,  Dwarakanath V. Simili ,  Mohammad Faizul Momen ,  Aayush Gupta ,  Chia-Chou Yeh

IPC: H02P21/00 ,  H02P27/08 ,  H02P6/10

CPC classification number: H02P6/10 ,  H02P21/22

Abstract: A multi-phase electric machine electrically connected to an inverter is described. A method for controlling the electric machine includes determining an initial current command responsive to a torque command for the electric machine and determining an expected torque ripple associated with operation of the electric machine. A mitigation current command is determined based upon the torque command and the expected torque ripple, and the electric machine is dynamically controlled responsive to the initial current command and the mitigation current command.

Abstract translation: 描述了电连接到逆变器的多相电机。 一种用于控制电机的方法包括：响应于电机的转矩指令确定初始电流指令，并确定与电机操作相关的预期转矩脉动。 根据转矩指令和预期的转矩波动来确定减轻电流指令，并且响应于初始电流指令和缓解电流指令动态控制电机。