众所周知,抽油机一般是在重载条件下启动,在露天工作,工作条件恶劣。因此,必然要求电动机具有较大的启动转矩和过载能力,同时还要求电动机工作可靠,维护简单,对恶劣环境的适应性强。目前,国内各油田的抽油机大多采用JO_2型三相异步电动机作动力。但是这种电动机启动转矩较小,过载能力差,转差率低,因此,要带动与电动机同样载荷的抽油机,必须选用比这一载荷大得多的电动机,而在矿场往往是不进行功率计算的。这样就 As we all know, pumping unit is usually started under heavy load conditions, working in the open air, working conditions are harsh. Therefore, the inevitable request of the motor has a large starting torque and overload capacity, but also requires the motor to work reliably, easy maintenance, adaptability to harsh environments. At present, most domestic oilfield pumping units use JO_2 type three-phase asynchronous motor as power. However, this type of motor has a small starting torque, poor overload capacity and low slip, so a pumping unit with the same load as the motor must use a much larger motor than this one, No power calculation. That’s it