SRM空间电感向量法低速无位置传感器控制技术

为解决开关磁阻电机(switched reluctance motor,SRM)无位置传感器启动和低速驱动运行控制的研究难题,文中基于SRM空间电感向量模型提出了一种新的转子位置估计方法。在电机启动及低速驱动运行两种不同状态下,该方法通过对电机绕组进行高频脉冲注入以实现三相电感辨识,并结合复平面内三相电感向量模型与转子位置角度之间的余弦函数关系,采用反余弦变换实现SRM转子位置准确估计。最终通过仿真和实验对提出的无位置方案进行了验证,结果表明,该方法能对SRM转子位置进行准确定位并实现无位置传感器可靠启动及低速运行。

Low-speed Sensorless Control of Switched Reluctance Motors Based on Space Vector Model of Phase Inductance

In order to solve the difficult research points of sensorless starting and low-speed operation of switched reluctance motor (SRM) used by electric vehicle.A new sensorless control method based on space vector model of phase inductance for switched reluctance motor is presented in this paper.Three-phase inductance of SRM are computed by pulse injection at startup and low-speed drive operating two different operating states,and through the cosine functional relationship between space vector model of phase inductance and angle to realize the rotor angle estimation.The realization of this sensorless method is simple and reliable.Finally,the proposed sensorless scheme is verified by simulation and experiment.The results show that the proposed method can estimate the rotor position accurately and meet the requirements of low-speed sensorless operation of SRM.