Development and Application of Asynchronous Motor Used in Digital Pumping Unit
JI Xiao-ke;Xu Li;ZHANG Hao;WEI Hui-ning;FAN Ya-ning;LI Yang;College of Mechanical and Electronic Engineering;Southwest Petroleum university;Equipmengt Management Departmengt;Changqing Oilfield Company;Xi’an changqing chemical group Co.;LTD;No.3 Oil Production Plant;Changqing Oilfield Company;