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1. (WO2017150652) MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE EQUIPPED WITH SAME

Pub. No.:    WO/2017/150652    International Application No.:    PCT/JP2017/008227
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: H02P 6/12
B62D 5/04
B62D 6/00
Applicants: NSK LTD.
日本精工株式会社
Inventors: KOGURE Teruyoshi
小暮 光義
SHIMAKAWA Shigeru
嶋川 茂
KUMAGAI Shin
熊谷 紳
SUZUKI Ryoichi
鈴木 良一
Title: MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE EQUIPPED WITH SAME
Abstract:
[Problem] To provide a motor control device capable of, without adding new device components, surely and highly reliably protecting, in response to an abnormal mode, a motor release switch constituted in a small size with a semiconductor switching element in association with a temperature, and to provide an electric power steering device equipped with the motor control device. [Solution] A motor control device in which a motor release switch comprising FETs is connected between an inverter and a motor detects an assist state and turns a control of the inverter on or off. The motor control device is provided with: a control unit for detecting the presence or absence of an abnormality; a motor rotation detection unit for detecting motor rotations; an energy calculation unit for calculating an energy based on the motor rotations; a determination unit for turning all the FETs of the motor release switch off when the energy enters a safe operating area; an abnormality detection unit; and a state detection unit for detecting the presence or absence of the abnormality based on information from the abnormality detection unit. The motor control device also turns the control of the inverter on when the state detection unit has not detected the abnormality and turns the control of the inverter off when the abnormality is detected.