基于改进式反电动势法的直线游标永磁电机无位置传感器控制

Sensorless Control of Linear Permanent Magnet Vernier Motor Based on Improved Stator Back EMF

直线游标永磁电机兼具高效率、低成本和大推力的优点,适合于轨道交通等长行程应用领域,但其位置传感器需沿轨道铺设,成本非常高.研究了一种基于反电动势的动子位置估计方法,实现该类电机的无位置传感器运行.采用定子磁链角与负载角相减的途径估计动子位置,估计的动子位置经锁相环得到动子速度,并构建了仿真模型.基于直线游标永磁电机系统进行了实验研究.当被控对象速度在0-1.5m/s范围内,动子位置估计误差在±5°范围内,速度估计误差在±0.01m/s范围内.仿真和实验研究验证了所提出的动子位置估计方法的可行性和实用性.

Linear permanent magnet vernier （ LPMV ） motor has the advantages like high efficiency, low cost, high thrust force. Therefore, it is suitable for application of rail traffic with a long stoke. However, position sensor installed along the track costs too much. In the paper, the mover position estimated method based on stator back EMF is researched to reach sensorless control. Estimated mover position is calculated by stator flux angle min using load angle. Estimated mover speed is estimated by a phase locked loop （PLL） with estimated mover position inputted. The simulation and experiment is carried out based on system of LPMV motor. The results show that there is a high accuracy of estimation when speed of the prototype in the range from 0 to 1. 5 m/s, mover position estimation is in error within plus and minus 5 °, mover speed estimation is in error within plus and minus 0. 01 m/s. Simulation and experiment results verify the feasibility and practicality of the mover position estimated method based on stator back electromotive force （ EMF ）.