Mitsubishi Denki Kabushiki Kaisha

Sadaaki Kojima

Hiroshi Araki

Satoru Kato

A method of controlling a rotary magnet multi-phase synchronous motor and a control system based on this method increases the permissible range of accuracy in installing a position detector on the synchronous motor and automatically calculates a phase correction to improve controllability. Using a position detector for detecting a magnet position of a rotary magnet multi-phase synchronous motor and a drive unit, the synchronous motor having the position detector is driven by a drive unit. After the synchronous motor reaches a constant speed, current and drive voltage of the synchronous motor are measured to calculate a phase correction value between a biaxial coordinate axis based upon the installation error of the position detector and a biaxial coordinate system from conversion of a polyphase AC coordinate system based on the measured current and drive voltage, constants of the synchronous motor, and the constant speed. The rotor position of the synchronous motor is corrected based on this phase correction value.

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Tokyo, Japan

Sadaaki Kojima