公开(公告)号：US20180123493A1

公开(公告)日：2018-05-03

申请号：US15569288

申请日：2015-06-22

Applicant: Mitsubishi Electric Corporation

Inventor： Shingo HARADA ,  Keiichi ENOKI ,  Yasukazu MURATA ,  Masutaka WATANABE ,  Yoshimasa NISHIJIMA

IPC: H02P21/22 ,  H02P29/66 ,  H02P21/14 ,  H02P21/00

CPC classification number: H02P21/22 ,  B60L15/025 ,  B60L2240/425 ,  B60L2240/429 ,  B60L2240/529 ,  H02P6/17 ,  H02P21/0089 ,  H02P21/141 ,  H02P29/662

Abstract: A motor control device having a motor temperature sensor for detecting a magnet temperature of the motor, a magnet magnetic flux calculation section that calculates a magnet magnetic flux of the motor corresponding to the magnet temperature of the motor, a current combination candidate calculating section that calculates a d-q axis current combination candidate that minimizes the input current of the inverter within a voltage limit ellipse determined by a value that can be output by a voltage of a power supply of the motor, and a d-q axis current search section that searches the d-q axis current that minimizes the input current of the inverter within the range of the combination candidate of the d-q axis currents when the d-q axis current of the motor moves on a voltage limiting ellipse by automatic weakening flux control.

公开(公告)号：US09692342B2

公开(公告)日：2017-06-27

申请号：US14867438

申请日：2015-09-28

Applicant: DENSO CORPORATION

Inventor： Ryo Kano ,  Takashi Suzuki ,  Hideki Kabune

IPC: H02P21/00 ,  H02P25/22 ,  H02K3/28 ,  H02P29/66 ,  B62D5/04

CPC classification number: H02P25/22 ,  B62D5/0403 ,  B62D5/046 ,  B62D5/0496 ,  H02K3/28 ,  H02P29/66

Abstract: A brushless motor for an electric power steering device that assists a steering operation includes: a stator having a plurality of winding sets for a plurality of systems respectively; and a rotator having a ferrite magnet. In the motor, a maximum current flowing without any demagnetization at high temperature is large. Hence, the torque of the motor is easily ensured at high temperature. In particular, when a failure occurs in one system, it is easy to ensure the torque of the normal system even at high temperature.

公开(公告)号：US11863101B2

公开(公告)日：2024-01-02

申请号：US17427286

申请日：2019-03-28

Applicant: Mitsubishi Electric Corporation

Inventor： Takahiko Kobayashi

IPC: H02P29/66 ,  H02P29/024 ,  H02P29/60 ,  H02M1/00 ,  F25B31/02 ,  H02M1/32 ,  H02M7/5387 ,  H02P27/08

CPC classification number: H02P29/027 ,  F25B31/026 ,  H02M1/0009 ,  H02M1/32 ,  H02M7/53871 ,  H02P27/08 ,  H02P29/60 ,  F25B2500/08

Abstract: A driving apparatus includes: an inverter unit generating a three-phase alternating-current voltage from a direct-current voltage in accordance with a drive signal based on a voltage command and outputting the three-phase alternating-current voltage to a permanent-magnet motor, the permanent-magnet motor including a permanent magnet; a current detection unit detecting a motor current flowing through the permanent-magnet motor; and a control unit generating the voltage command to control an operation of the inverter unit and estimating a temperature of the permanent magnet to perform a protection operation on the inverter unit on the basis of the motor current and an overcurrent protection threshold. The control unit sets the overcurrent protection threshold on the basis of a magnet temperature estimated value of the permanent magnet and any one of a control computation period of the control unit, an output voltage frequency of the inverter unit, and a carrier frequency based on the output voltage frequency of the inverter unit.

公开(公告)号：US11641175B2

公开(公告)日：2023-05-02

申请号：US17342795

申请日：2021-06-09

Applicant: Mitsubishi Electric Corporation

Inventor： Hitoshi Isoda ,  Shinsuke Kayano ,  Kengo Kumagai ,  Noriyuki Wada

IPC: H02P29/64 ,  G01K13/08 ,  H02P29/66

Abstract: A controller for a rotary electric machine may include: at least one memory that stores a temperature prediction data in which a relationship among a rotational speed of a rotary electric machine, a torque information of the rotary electric machine, a temperature of the rotary electric machine at a reference time point, and a temperature of the rotary electric machine after an estimation calculation period elapses from the reference time point, and at least one processor that, at every estimation calculation period, sets the last calculation time before the estimation calculation period as the reference time point, and, by referring to the temperature prediction data, calculates an estimation value of temperature of the rotary electric machine after the estimation calculation period elapses from the last calculation time.

公开(公告)号：US11563400B2

公开(公告)日：2023-01-24

申请号：US17388867

申请日：2021-07-29

Applicant: HYUNDAI MOTOR COMPANY ,  KIA CORPORATION

Inventor： Tae Il Yoo ,  Seong Min Kim ,  Seon Mi Lee ,  Ho Sun Jang ,  Ho Rim Choi ,  Han Hee Park ,  Seung Hyeon Bin

IPC: H02P29/66

Abstract: An iron loss reduction control apparatus for motor permanent magnet overtemperature protection is provided. The apparatus includes: a permanent magnet temperature prediction unit configured to predict a temperature of a permanent magnet in a motor based on a driving state of the motor; a first iron loss reduction unit configured to adjust a switching frequency of a switching element in an inverter providing a driving power to the motor based on the temperature of the permanent magnet; and a second iron loss reduction unit configured to adjust a current command of the motor based on the temperature of the permanent magnet.

公开(公告)号：US11502637B2

公开(公告)日：2022-11-15

申请号：US17037367

申请日：2020-09-29

Applicant: AUDI AG

Inventor： Bernhard Karl ,  Martin Adam ,  Sebastian Heber ,  Franz Honkomp

IPC: H02P29/66

Abstract: Methods and apparatuses for determining a rotor temperature of a permanent magnet synchronous machine (PSM) of an electrically driven vehicle are described.

公开(公告)号：US11502346B1

公开(公告)日：2022-11-15

申请号：US17877208

申请日：2022-07-29

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Xiaojian Huang ,  Zhimin Dan ,  Bao Li ,  Xiyang Zuo

IPC: H01M10/63 ,  H01M10/615 ,  H01M10/625 ,  H01M10/48 ,  H02P29/66 ,  G01K3/00 ,  G01K3/10 ,  G01R31/34 ,  B60L58/27

Abstract: Disclosed is a traction battery self-heating control method and a device. Acquiring a second temperature of a rotor at a current sampling time according to system parameters and a first temperature of the rotor at a previous sampling time, and estimating a third temperature of the rotor at a next sampling time according to the first temperature and the second temperature, and stopping the self-heating of the traction battery when the third temperature reaches a demagnetization temperature of the rotor. Whether to stop the self-heating of the traction battery is determined by estimating a rotor temperature under the self-heating condition, and comparing the rotor temperature with the demagnetization temperature of the rotor, and thus the self-heating control of the traction battery is realized.

公开(公告)号：US20220329190A1

公开(公告)日：2022-10-13

申请号：US17761657

申请日：2020-08-20

Applicant: Nidec Corporation

Inventor： Tomohiro FUKUMURA ,  Linfeng LAN

IPC: H02P23/14 ,  H02P29/66

Abstract: A first torque estimator determines a first torque estimation value according to a cross product method, and a second torque estimator determines a second torque estimation value according to an energy method. A torque weight adjuster adjusts, using a weighting coefficient calculated in accordance with a predetermined condition, weightings respectively applied to these two types of torque estimation values, and outputs a torque estimation value

公开(公告)号：US20210297034A1

公开(公告)日：2021-09-23

申请号：US16826152

申请日：2020-03-20

Applicant: Schneider Electric USA, Inc.

Inventor： Roy Stephen COLBY

IPC: H02P29/66

Abstract: Motor overload protection device is equipped with a thermal monitor that can determine expected rotor temperature rise from rotor resistance estimates. The thermal monitor determines expected rotor temperature rise by using a correlation between rotor temperature rise computed from rotor resistance estimates, and motor thermal state estimates. The correlation can be derived by fitting a line to a plurality of points, with each point defined by an ordered pair composed of a rotor temperature rise estimate and a corresponding motor thermal state estimate, and determining a slope of the line. This rotor temperature slope can then be used by the thermal monitor to determine a rotor temperature rise given a rotor resistance estimate and a corresponding motor thermal state estimate. If the rotor temperature rise exceeds an expected rotor temperature rise by more than a predefined threshold, the thermal monitor issues an alarm and/or takes corrective actions in some embodiments.

公开(公告)号：US20210175838A1

公开(公告)日：2021-06-10

申请号：US17269073

申请日：2019-08-12

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Ji-Young BYUN ,  Yong-Ho YOU ,  Hyoungil KIM

IPC: H02P29/66 ,  G03G15/00 ,  H04N1/23 ,  H02P8/36

Abstract: An image forming apparatus and an image forming method are provided. The image forming apparatus includes a printing engine to form an image, a step motor to drive the printing engine, a driving circuit to provide a constant current to the step motor and sense a voltage corresponding to a magnitude of the constant current provided to the step motor, and a processor to calculate a temperature of the step motor based on the voltage sensed by the driving circuit during an excitation period of the step motor and control an operation of the image forming apparatus based on the calculated temperature.