基于全周期电感空间矢量的开关磁阻电动机无位置传感器控制

Sensorless control of switched reluctance motor based on full-cycle inductance space vector

针对转子位置传感器导致开关磁阻电动机可靠性降低、复杂度增加等问题,提出了一种基于全周期电感空间矢量的开关磁阻电动机无位置传感器控制方法。电动机启动时各相同时注入激励脉冲,电动机运行时非导通相注入激励脉冲,导通相采用能量回馈式电流斩波控制,通过计算电流斜率差来辨识全周期电感;利用全周期电感空间矢量与角度关系估计转子位置。仿真和实验结果表明,电动机在启动和稳态运行时的转子位置最大估计误差分别为0.8°和0.5°,满足开关磁阻电动机无位置传感器控制精度要求。

In view of problems of less reliability and more complexity of switched reluctance motor caused by rotor position sensor,a sensorless control method of switched reluctance motor based on fullcycle inductance space vector was proposed.In the method,each phase is injected with drive pulse at starting stage of the motor,non-conducting phase is injected with driving pulse and conducting phase uses energy returnable current chop control at running stage of the motor,so as to identify full-cycle inductance by calculating current slope difference.Then,the rotor position is estimated through relationship between full-cycle inductance space vector and its angle.The simulation and experimental results show that the maximum estimation errors of the rotor position at starting and steady running stage of the motor are 0.8°and 0.5°respectively,which meet accuracy requirement of sensorless control of switched reluctance motor.