| In China, mine elevator whose electric control system uses speed regulation by means of stringing and slicing the rotor resistance, and constitutes the logic control device by the relay and contactor adopts the means of the drive of AC asynchronous motor in most cases. This paper which studies and designs the parts of speed regulation by means of stringing the rotor resistance in the electric control system of AC mine elevator , adopting PLC which takes the place of the logic control device constituted by the relay and contactor takes the security, reliability, high efficiency, economy as a starting point, and takes the reliability principle as the basis,This paper sets JKD4×6 multi- ropes rubbed elevator for an example, proposes the research and design plan which puts in practice successfully. in Jing Gezhuang mining industry company of Kailuan (group).The electric control system based on PLC has carried out the procedure control of hoist process and high accuracy, closed-cycle control of mine elevator through speed, electric current as well as digital switching of vector and so on , the monitor of important parameters such as the distance of travel ,speed, the state of hoist .In addition ,the system also has carried out contactless control, long life-span,reliability greatly improved, good control supervisory system and completely automation of relevant datas'demonstration, recording, printing and so on.
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