无位置传感器控制下的永磁同步电机电阻在线辨识

Online Resistance Identification for Permanent Magnet Synchronous Motor under Position Sensorless Control

提出一种在全速域内实现永磁同步电机无位置传感器控制及定子电阻在线辨识的方法。利用高频方波注入法实现电机零、低速无位置传感器运行,在中、高速时则切换至同步轴系滑模观测器。定子电阻与绕组温度、控制性能紧密相关,在静止两相坐标系下注入直流扰动电流并对其进行闭环控制,通过欧姆定律计算定子电阻。所提方法不依赖其他电机参数,对系统运行影响小,且适用范围广。仿真结果表明其精度达±5%,可用于绕组温度监测以及改善无位置传感器控制的性能。

A method is introduced to achieve position sensorless control and online stator resistance identification for PMSM in the full speed range. The high-frequency square wave injection method is utilized to accomplish position sensorless operation at zero and low speed, while switching to the synchronous shaft sliding mode observer at medium and high speed. The stator resistance is closely related to winding temperature and control performance, and it can be calculated by Ohm′s law with the DC disturbance current injection and closed-loop control in the stationary two-phase coordinate system. The proposed method does not rely on other motor parameters, has little impact on the system operation and is widely applicable. The simulation results show that the accuracy is ±5%, which can be used to monitor the winding temperature and improve the performance of position sensorless control.