本文叙述了由不带滤波的脉宽调制逆变器供电的电动机在理论性能方面的一些研究。文中着重叙述了定子铜耗和绕组绝缘的寿命,还叙述了一个感应电动机系统及其低频附加转矩的产生。通过评价它们之间的相对意义,证明脉宽调制供电对电动机的性能和使用寿命可能有一个反作用,并且可使改变电动机的设计比采用“简易的”逆变器系统更为需要。 This article describes some of the theoretical performance studies of motors powered by unfiltered PWM inverters. The paper mainly describes the stator copper loss and winding insulation life, also describes an induction motor system and its additional low-frequency torque generation. By evaluating their relative significance, it is proven that pulse-width modulated power supply can have an adverse effect on motor performance and service life and can make changing the motor design more desirable than using a “simple” inverter system.