换向器

例句：

1. 1. The commutator is a crucial component of the electric motor.
   换向器是电动机的关键部件。
2. 2.The switchboard is responsible for controlling the flow of electricity.
   开关板负责控制电流的流动。
3. 3.The commutator plays a vital role in ensuring smooth operation of the motor.
   换向器在确保电机平稳运行中起着至关重要的作用。