Abstract

At present,in allusion to problems of high motor energy dissipation,low reliability in the coal mine drain system of our country.The motor which is used to drag pump is controled by variable frequency speed system.The mechanical properties of down-hole pump and the principle and methods of the pump energy saving applied variable frequency speed will be expounded.Studies show that effects of the technology and energy saving is remarkable and that has a certain degree of social and economic benefits.

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