ring motor

例句：

1. 1. The ring motoris responsible for driving the conveyor belt.
   环形马达负责驱动输送带。
2. 2. The ringmotor is a crucial component of the elevatorsystem.
   环形马达是电梯系统的关键部件。
3. 3.The ring motor is used to control thespeed of the car's wheels.
   环形马达用于控制汽车车轮的速度。