采用SPWM电容的单相电机研究（Ⅰ）

Study of Single Phase Motor with SPWM Capacitor

提出了一种用ＳＰＷＭ逆变电容替代单相双值电容电机中常规电容的方案．定性分析表明此方案取消了原电机中的离心开关，为电动机提供可连续变化的电容，使电机获得接近圆形的旋转磁场，且这种特点不随工作点的变化而变化，因而改善了电机性能，并为电机设计提供灵活性．

A plan in that the standard capacitor has been replaced with SPWM invert dc capacitor is suggested.Analysing shows that in this plan the centrifugal switch is canceled,a continuously variable capacitance is supplied for the motor.The motor performance is improved and the auxiliary winding turn ratio may be reduced.