commutator

名词 commutator:

1. switch for reversing the direction of an electric current

1. It is very necessary to make sure that the carbon brushes stay in good contact with the commutator.
   确定一下碳刷与换向器是否保持良好的接触，是非常必要的。

com.mu.ta.tor

n.（名词）
A cylindrical arrangement of insulated metal bars connected to the coils of a direct-current electric motor or generator, providing a unidirectional current from the generator or a reversal of current into the coils of the motor.
电流转换器；整流器：绝缘金属棒的圆柱形配置，连接到直流电动机或发电机线圈上，从发电机中提供方向不变的电流或对电动机线圈提供反向电流