基于高频方波信号注入的永磁同步电机初始位置检测方法研究

Research on Initial Position Detection Method of Permanent Magnet Synchronous Motor Based on High Frequency Square Wave Signal Injection

针对表贴式永磁同步电机,使用高频方波信号注入法,对其初始位置检测技术展开研究。对高频方波信号注入法和磁极辨别技术进行理论分析和公式推导,得到转子初始位置的表达式。利用Matlab/Simulink软件搭建永磁同步电机矢量控制系统和初始位置检测系统,仿真结果表明该方法可以准确获得转子初始位置信息,误差为0.05 rad。最后编写初始位置检测和磁极极性辨别的程序,在电机平台上进行硬件试验,试验结果表明该方法可以准确地获取转子的初始位置信息,误差为0.018 rad。

The initial position detection technology of surface mounted permanent magnet synchronous motor(SPMSM)is studied by using high frequency square wave signal injection method.Firstly,the high frequency square wave signal injection method and the magnetic pole discrimination technique are theoretically analyzed and the formula is deduced to obtain the expression of the initial position of the rotor.Then,the vector control system and the initial position detection system of permanent magnet synchronous motor(PMSM)are built by Matlab/Simulink.The simulation results show that the method can accurately obtain the initial position information of the rotor with an error of 0.05 rad.Finally,the program of initial position detection and pole polarity identification is written,and the hardware experiment is carried out on the motor platform.The experimental results show that the method can accurately obtain the initial position information of the rotor,and the error is 0.018 rad.