To provide a basis for precise calculation of pumping Unit, it is necessary to make a elastodynamic analysis on the u-nit. 要对抽油机的设计提供较为精确的理论计算依据，必须对抽油机进行弹性动力分析。
This paper mainly focuses on the fluctuation of velocity and torque of the electromotor because of the variational load in the pumping unit equipment. 摘要抽油机中载荷变化大，易引起电动机转速和转矩的波动。
