关键词: 永磁无刷直流电动机, 坐标变换法, 换相误差, 换相点校正, 转子磁链观测

Abstract:

Taking high-speed permanent magnet brushless DC motor as the object, in the view of the difficulties to detect the rotor position of the high-speed permanent magnet brushless DC motor at high speed, a sensorless control strategy based on coordinate transformation was studied under the foundation of traditional back EMF method. In the view of the commutation error of phase current of the motor, the maximum torque/current ratio commutation correction control algorithm (MTPA) based on rotor flux observation was studied under the sensorless control driven strategy of coordinate transformation method. The method can correct the commutation point of the motor, so that the phase of the current was consistent with the phase of the back EMF and the performance of the motor system is improved. The effectiveness and advantages of coordinate transformation method sensorless control strategy and flux linkage method of maximum torque/current ratio commutation correction algorithm of high-speed permanent magnet brushless DC motor were verified through the simulation platform.

Key words: permanent magnet brushless DC motor, coordinate transformation, commutation error, correction method of commutation point, rotor flux observation