From the fundamental equations of AC servo system, using the principle of coordinate transformation of vector a concise mathematical model is deduced, the speed examination arithmetic of PMSM is obtained.

• 摘要根据交流伺服电机的工作原理，利用矢量坐标变换原理，推导出交流永磁同步电动机的矢量控制数学模型，得出了交流永磁同步电动机速度检测算法。