varying frequency speed controner

• 变频器

varying frequency speed controner的用法和样例：

例句

1. When the frequency changer has malfunction, power frequency is adopted, and the motor speed is nonadjustable.
   万一变频器出现故障时，可工频驱动，转速不可调。
2. The paper mainly introduces the technology of adjusting speed of convertor and its superiority.
   主要介绍变频器的调速技术及使用变频器的优越性。