永磁同步电机的转子初始位置检测

Rotor Initial Position Detection of Permanent Magnet Synchronous Motor

摘要: 针对传统机械式永磁同步电机(PMSM)转子初始位置检测方法存在可靠性差、适用范围小的缺陷，对利用高频信号注入的转子位置检测方法进行了改进。该方法利用PMSM的凸极效应，将永磁同步电机注入高频信号，对三相电流进行滤波后用外差法提取转子位置信息，并设计观测器准确地估计出转子位置。在滤波环节，设计了一种基于比例谐振控制器的带通滤波器，简化了滤波器结构，易于数字实现。仿真实验结果表明，提出的方法可以准确检测PMSM转子位置，位置检测的平均误差在0.1˚以内。

Abstract: Aiming at poor reliability and small applicable range of the traditional rotor initial position detection method for permanent magnet synchronous motor, a rotor position detection method using high frequency signal injection is improved. The high frequency signal is injected in the three-phase permanent magnet synchronous motor. The salient effect based on the current con-taining rotor position information is obtained and filtered, where a band-pass filter based on proportional resonance controller is designed, which simplifies the structure of the filter and is easy to realize digitally. Then, the position information is extracted by a heterodyne method and the position is accurately estimated by the rotor position observer. The simulation results show that the presented method can accurately estimate the rotor position and the average error of position detection is within 0.1˚.