But Xie Yunyue says, common linear electric machinery also can not satisfy the efficiency of the large facility such as pumping unit to ask, main difficult problem is bulk wants small, power big, this and the fundamental of common electromotor are contrary to. 2005, a research organization of Beijing is taking difficult problem Mu Minglai to go to Zhejiang university linear electric machinery and contemporary drive institute look for Xie Yunyue, after this, xie Yunyue begins development to be used technically at the drive pumping unit electromotor that is apart from sharp movement machine energetically. After a year, he uses external rotor electric machinery and structure of disk type electric machinery compound, make full use of the space of electric machinery structure, with Fan Chengzhi a trial-produce such as the associate professor succeeded the first complex formula achieved a design to ask " electric machinery of three-dimensional permanent magnetism " already was in try out of Central Plains oil field a year, the effect all is like person meaning.