异步电动机电容补偿起动过程的仿真研究

Simulation Study on Capacitor Compensation Starting Process of Three Phase Asynchronous Motor

为了得到三相异步电动机电容补偿起动过程的运行特性,建立了三相异步电动机电容补偿起动系统在α-β坐标系下的数学模型,模型中考虑了转子参数随转速变化的因素。通过实例对三相笼型异步电动机的电容补偿起动过程进行仿真计算。仿真结果表明,异步电动机采用电容补偿起动,可以降低起动电流,提高电机起动转矩,缩短起动时间,是一种具有实际应用价值的起动方法。

In order to gain the operation characteristic of capacitor compensation starting asynchronous motor,this paper established a mathmatical model in α-β coordinates for simulation the starting performances of capacitor compensation system of three-phase squirrel-cage asynchronous motor.The influence of the rotor impedence is taken account in the modle.simulation. the start-up process of capacitor compensation system of induction motor are simulated using this model through a real example.The results of simulation show that the capacitor compensation start-up of three-phase squirrel-cage asynchronous motors can cut down stating current, maintain high starting torque and shorten starting time.The mathematics model proposed in this paper can be used to analyse and calculate the capacitor start-up system of three-phase squirrel-cage asynchronous motor.