变频驱动器（VFD）为感应电机提供变频和电压下的脉宽调制（PWM）电源。除了VFD的能耗外，PWM功率中的谐波还可能产生额外的电机功率损耗。在VFD电机驱动系统上进行了实验，以研究额定频率下的VFD效率和额外电机功率损耗。实验结果表明，对于所研究的驱动系统，在额定频率下，PWM功率不会产生明显的额外电机功率损耗，VFD能量效率为95.5%。 引用:2019年年度会议，密苏里州堪萨斯城，扩展摘要

Variable frequency drives (VFDs) supply induction motors the pulse width modulation (PWM) power at variable frequency and voltage. In addition to the energy consumption by VFDs, the harmonics in the PWM power may generate additional motor power loss. An experiment was conducted on a VFD-motor drive system to investigate the VFD efficiency and additional motor power loss at the rated frequency. The experimental results show that the PWM power does not generate significant additional motor power loss and the VFD energy efficiency is 95.5% at the rated frequency for the studied drive system.