基于改进信号注入法的同步电机初始位置检测

Research of Initial Rotor Position Detection in Electrically Excited Synchronous Motor Based on Improved Signal Injection Method

在电励磁同步电机控制系统中,转子初始位置角的检测对电机起动起到至关重要的作用,而传统电压积分法存在积分漂移等缺点。为了快速且精确地获得电励磁同步电机转子初始位置角,根据电励磁同步电机转子不对称的特点,采用转子高频信号注入法对电机转子初始位置角度进行检测。采用滑动傅里叶变化对高频信号注入法中提取位置信号的方法进行改进,并对带有转子初始位置检测的电励磁同步电机气隙磁链定向矢量控制系统的起动进行研究。结果表明,改进后的基于转子高频信号注入法的电励磁同步电机初始位置检测方法能够快速精确地获得转子初始位置,并且,电机在矢量控制系统中能够正常起动运行。

In the control system of electrically excited synchronous motor （ EESM）, the detection of initial rotor position angle is very important to the starting of the motor, however, the traditional voltage integral method has the disadvantages of integral drift and so on. In order to detect initial rotor position angle of EESM quickly and accurately, based on the characteristics of the asymmetry of EESM＇s rotor, rotor high frequency signal injection method was studied to detect rotor position angle. The sliding discrete fourier transform （SDFT） was used to improve the traditional method of rotor position signal obtain. Based on the air-gap flux oriented vector control system of EESM and initial rotor position detection, the starting of EESM was studied. The results show that, based on rotor high frequency signal injection method, the initial position angle of EESM can be detected quickly and accurately, and EESM could be started and operated normally in vector control system.