In this p aper,according to the structure of converter, circuit and state equation of sync hronous motor, step motion system is simulated by using circuit and electronics simulating program ICAP.

• 依据变频器的结构及同步电动机的电路与状态方程,运用电路电子仿真软件包ICAP对步进传动系统进行了仿真研究,取得了良好的效果。