绞车,起货机一种装有卷筒的固定的电动机驱动或手动的吊升机械,卷筒周围缠绕着与提升的重物相连的绳索 A stationary motor-driven or hand-powered hoisting machine having a drum around which is wound a rope or chain attached to the load being lifted.
(同步电动机的)速度偏差同步电机运行速度的周期性变化 The periodic variation in speed of a synchronous motor with respect to the current.
这些机器都是由电动机驱动的。 The machines are driven by electric motors.