基于滑模观测器的无轴承永磁同步电机无速度传感器矢量控制∗

摘要

A novel control strategy based on sliding mode observer was present for the purpose of solving the problems of cost and reliability caused by the mechanical sensor of the bearingless permanent magnet synchronous motor ( BPMSM) vector control system. The sliding-mode surface and the sliding-mode equivalent control method was used in the control system. And, the sliding-mode surface was defined on the errors between the actual and estimated currents. The estimated back-EMF was observed to calculate the angle and speed of the rotor. Simulation system of speed sensorless was constructed in MATLAB/Simulink environment and simulations of speed/angle identification for the rotor were carried out. The simulation results had showed that sliding mode observer speed/angle identification precision was very well and was able to achieve stable sensorless suspension running.%为解决无轴承永磁同步电机矢量控制系统中传统机械式传感器带来的成本及可靠性等问题，将滑模观测器技术应用到其控制系统中。该系统采用滑模面及滑模等效控制方法，并基于转矩绕组观测电流和其实测电流差值构建滑模面，观测电机反电动势，从而实现转子位置角及转速的精确估算。利用MATLAB仿真软件构建了无速度传感器运行仿真系统，对电机转速、转角信号进行辨识。仿真结果表明：滑模观测器的转角、转速信号辨识精度较高，并能满足无轴承永磁同步电机无速度传感方式的稳定悬浮运行要求。