Power braking is usually required when mine hoist is at reducing stage, but sPeed closed-loop control is difficultly realized.
交流矿井提升机的减速阶段，一般要求主要用动力制动，但速度闭环控制难实现。
In this paper, the hoist and lower automatic control system for stage and orchestra is designed, which is necessary to high technical equipment for those newly built theaters.
本文以新建剧场所用高技术设备为背景，设计了一个具有升降舞台和升降乐池的舞台自动控制系统。
In this paper, the hoist and lower automatic control system for stage and orchestra is designed, which is necessary to high technical equipment for those newly built theaters.
本文以新建剧场所用高技术设备为背景，设计了一个具有升降舞台和升降乐池的舞台自动控制系统。
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