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1. (WO2018198734) MOTOR DRIVE DEVICE, MOTOR DRIVE METHOD, RECORDING MEDIUM, AND ENGINE COOLING DEVICE

Pub. No.:    WO/2018/198734    International Application No.:    PCT/JP2018/014848
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Tue Apr 10 01:59:59 CEST 2018
IPC: H02P 29/02
H02P 6/18
H02P 29/68
Applicants: NIDEC CORPORATION
日本電産株式会社
Inventors: TAKADA Tomoyuki
▲高▼田 知幸
Title: MOTOR DRIVE DEVICE, MOTOR DRIVE METHOD, RECORDING MEDIUM, AND ENGINE COOLING DEVICE
Abstract:
Provided is a motor drive device for driving a motor, wherein: the motor drive device includes a control unit for outputting a drive signal that causes the motor to be driven, a drive unit for supplying the motor with a current supplied from an external power source on the basis of the drive signal outputted from the control unit, and a current detection unit for detecting the current flowing through the drive unit; and the control unit, after having outputted a drive signal for causing the motor to be driven at a first rotational speed, calculates the torque generated in the motor and the rotational speed of the motor from the current value of the current detected by the current detection unit, compares the calculated value of the calculated torque with a limit value for the torque at the calculated rotational speed, and outputs a drive signal that causes the motor to be driven at a second rotational speed lower than the first rotational speed if the calculated value is higher than the limit value.