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。
Power braking is usually required when mine hoist is at reducing stage, but sPeed closed-loop control is difficultly realized.
目前，我国实际生产中使用的矿井提升机有相当一部分是交流提升机。
At present, the AC hoist is used as the major mine hoist in our countrys mine production in domestic.
现代交流调速技术因其优越的性能和日益成熟的技术将在包括矿井提升机在内的电力传动系统中普及。
Modern control system of AC motors is gradually prevalent in electrical drives include of mine-hoist because of its remarkable performance and mature technology.
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