A Detecting Method of Initial Rotor Position for Permanent Magnet Synchronous Motor

영구자석 동기전동기의 회전자 초기위치 검출법

This paper describes a new detecting method of initial rotor position for PMSM without a position sensors. The proposed method uses the fact that the back-EMF is differently generated according to tile initial rotor position of Permanent Magnet Synchronous Motor (PMSM). The voltage with short duty is impressed to each phase at standstill. Then, we can detect the rotor position by comparing the amplitudes and signs of three phase current each other. Experimental results show the validity of the proposed method.