关键词: 永磁同步电机, 转子定位, 全速范围

Abstract:

A method for position detection and initial positioning permanent magnet synchronous motor rotor is developed based on DSP for the precise transformation of coordinate system of motor positions.The improved magnetic localization method is used when motor is stationary,where the rotor is tracked out of the positioning blind spots by outputting DC torque twice,and then fixed to the predetermined position to get the rotor initial position.The improved M/T method is used when motor is running,which uses variable sampling time to measure speed and rotor position information.The experimental based on DSP results show that the method can accurately locate the initial position of the rotor and that the motor can accurately detect the rotor position at low speed and high speed,verifying the reliability and validity of the method.

Key words: permanent magnet synchronous motor;rotor position;whole speed range