关键词: 抽油机 , 电动机 , 负载率 , 功率 , 扭矩 , 效率

Abstract: The load characteristic of pumping units is a cyclicity loading. In order to startup and run the pumping units normally, the electrical motor theory installed power of pumping unit was usually higher than running power for requirement of the motor margin, which makes the electric power lost. The reasonable upper limit of electrical motor power utilization ratio by theorical check of the motor heating conditions、overload capacity and startup character and the lower limit by characteristic curve of electrical motor were made. It had been checked by experimental study. Declining electrical motor of pumping units installed power reasonably not only can raise electrical motor power utilization ratio and decrease initial investment, but also can make importance for energy saving of oilfield. 

Key words: Pumping unit, Electrical motor, Power utilization ratio, Power, Torque, Efficiency