基于高频方波信号注入的PMSM无传感器低速运行研究

Research on High Frequency Square Wave Injection Method for PMSM Sensorless Low-speed Operation

目前,永磁同步电机(PMSM)无位置传感器运行研究受到广泛关注。采用一种基于高频方波信号注入的方法实现PMSM无位置传感器启动以及低速运行。首先详细分析了高频方波信号注入检测原理,然后对注入的高频方波信号以及电流采样模式进行了改进。向估计的两相旋转坐标系注入高频方波电压信号,根据检测到的定子电流并结合注入的电压信号即可获得转子位置,并且利用电机的磁路饱和特性,实现转子初始位置检测。所提出的改进方法不依赖于准确的电机参数,信号处理过程简单易实现。仿真结果验证了该方法的正确性。

Nowadays, the PMSM sensorless control attracts more and more attention from many researchers. A method based on high frequency square wave injection algorithm was used in the PMSM sensorless start and tow-speed operation control. The principle of square wave injection method was analyzed in detail firstly. Then an improved high frequency square wave voltage was injected into the stator of the motor in the axe directions of the estimated two-phase rotating coordinate, and the stator currents were measured to extract the rotor position information with the help of the injected signal. The proposed method was independent of motor parameters and the signal processing was simple to realize. Simulation results verify the validity of the method.