一种永磁同步电动机的宽调速范围控制方法

Wide speed range control method of permanent magnet synchronous motor

针对永磁同步电动机的宽调速范围应用和弱磁难问题,提出了一种永磁同步电动机的宽调速范围控制方法,该方法基于矢量控制原理,基速以下采用id=0控制,基速以上采用弱磁控制,利用电压外环调节器产生直轴电流参考值id*,不依赖于电机参数,易于数字化实现。提出电流反馈解耦控制方法,实现了d、q轴电流的完全解耦,提高了永磁同步电动机的控制性能。在5.5kW的内置式永磁同步电动机上进行了仿真,扩速倍数可达3倍,转速、转矩控制性能良好,验证了控制方法的有效性,对永磁同步电动机的宽调速范围应用具有实际意义。

For the current situation of permanent magnet synchronous motor＇s wide speed range application and fluxweakening,a method of permanent magnet synchronous motor＇s wide speed range control is proposed.This method is based on vector control theory,id=0control method used below base speed and flux-weakening control method used above base speed.Direct axis current reference value id＊is generated by external voltage loop controller.id＊is not dependent on motor parameters and easy to digital realization.The current feedback decoupling control method is proposed to decouple completely d and q axis current,which improves the control performance of permanent magnet synchronous motor.The control method is simulated in 5.5kW interior permanent magnet synchronous motor.The simulation results show the speed range expansion is up to three times,at the same time,speed and torque control performance is good.The simulation verifies the effectiveness of the control method,and the control method has practical significance for the wide speed range application of permanent magnet synchronous motor.