介 绍了在估算的两相旋转坐标系下的永磁同步电机模型，推导出了反电动势方程的扩展形式。针

对凸极永磁同步电机提出了在电动机低速时，利用凸极跟踪法和在高速时利用反电动势相结合来获得转子

转速和转子位置的方法。仿真结果表明两者相结合的估算方法的有效性。-t:A modelo fp ermanentm agnets ynchronousm otor(P MSM)i nt hee stimationt wop haser otating

reference frame is introduced and an extended back electromotive force (EMF) equation is deduced. A

sensorless control strategy for a salient-pole PMSM using saliency tracking at low speed and back EMF at

high speed is presented to obtain the rotor speed and position. The simulation results illustrate the validity of

the approach.

Ke yw or ds p ermanentm agnets ynchronous motor(PMSM) speed sensorless back EMF high frequency

signal