基于高频方波电压注入的同步磁阻型特种电机无传感器控制方法研究

Research on Sensorless Control Method of Synchronous Reluctance Special Motor Based on High-frequency Square Wave Voltage Injection

针对同步磁阻(SynR)型特种电机在高温高压、强辐射的工况下,位置传感器对转子位置检测容易出现失灵或者检测误差较大的现象,提出一种不需要依靠位置传感器就可以将SynR型特种电机位置检测出来的无传感器控制方法。该方法在矢量控制的基础上通过向估计的d轴注入正负交替的高频方波电压信号,在估计的q轴会产生相应的高频响应电流,高频响应电流中包含有电机转子位置信息,将高频响应电流通过转子位置观测器就可以将转子的位置信息估算出来,实现对SynR型特种电机的无传感器控制。仿真结果表明,所提出的方法可以实现在高温高压强辐射工况下无位置传感器时对SynR型特种电机的精准控制,具有收敛速度快、精度高,易于工程实现等优点。

Aiming at the phenomenon that the position sensor of synchronous reluctance special motor is prone to failure or large error in rotor position detection under high temperature,high pressure and strong radiation,a sensorless control method is proposed to detect the position of synchronous reluctance special motor without relying on the position sensor.On the basis of vector control,the positive and negative alternating high-frequency square wave voltage signals are injected into the estimated d-axis,and corresponding high-frequency response current is generated in the estimated q-axis.The high-frequency response current contains the rotor position information of the motor.The rotor position information can be estimated through the rotor position observer,and the sensorless control of synchronous reluctance special motor can be realized.The simulation results show that the proposed method can achieve accurate control of the synchronous reluctance special motor under high temperature,high pressure and strong radiation conditions,and has the advantages of fast convergence,high accuracy and easy engineering implementation.