基于扩展反电动势法的长定子直线同步电机无速度传感器控制研究

Research on Speed Sensorless Control of Long Stator Linear Synchronous Motor Based on EEMF

针对长定子直线同步电机高速运行时,机械传感器无法准确地获得转子位置和速度信号的问题,研究了一种适合在长定子直线同步电机中应用的扩展反电动势法无速度传感器控制策略。基于长定子直线同步电机的数学模型,分析了扩展反电动势法用于长定子直线同步电机无速度传感器控制的鲁棒性。仿真和实验结果证明了基于锁相环的扩展反电动势法无速度传感器控制能够实现高速时电机的无速度传感器闭环控制,并且此方法对电机参数变化具有较强的鲁棒性。

Motion control of synchronous motors requires accurate position and velocity signalsto realize field orientation.When long stator linear synchronous motor runs at high speed, the position and velocity signalsis hard to be obtained by mechanical sensor. To solve this problem, a speed sensorless control method based on extended electromotive force （EEMF） is studied forlong stator linear synchronous motor. With the mathematical model of long stator linear synchronous motor, the robustness of speed sensorless control methodbased on EEMFisanalyzed. Simulation and experimental results show that the speedsensorless of EEMF with phase-lock loop （PLL） achieve closed-loop control for the long stator linear synchronous motor at high speed, and this method is robustto the motorparameters.