Fuji Electric Co., Ltd.

Takeshi Kuroda

Akio Toba

A motor driving system is disclosed having a control deviceA for controlling a synchronous motor, the control deviceA comprising a sensorless control algorithm devicethat includes an abnormality determining devicefor determining abnormality of the algorithm based on a magnetic pole position error estimated value of the motor. When the abnormality determining devicehas determined abnormality of the algorithm, the control deviceA controls a power converterusing a magnetic pole position detected value detected by a magnetic pole position detectorattached to the motor, in place of using a magnetic pole position estimated value. This motor driving system can guarantee reliability of the sensorless control algorithm devicewhile assuring safety. Safety of electric vehicles is enhanced by installing the motor driving system that has been guaranteed reliable.

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Hino, Japan

Takeshi Kuroda