基于改进滑模观测器的永磁同步电机无传感器控制

Sensorless Control of Permanent Magnet Synchronous Motor Based on Improved Sliding-Mode Observer

针对永磁同步电机无传感器控制的传统滑模观测器(SMO)算法存在系统抖振以及转速位置误差较大的问题,提出了一种改进的SMO算法,引入估算反电动势反馈,利用饱和函数代替开关函数,用变趋近率替换固定滑模增益,根据Lyapunov方法验证了系统的可靠性,再通过锁相环(PLL)获得准确的转子位置和速度信息,最后通过Simulink搭建仿真模型并进行相关试验,仿真和试验结果表明,改进后算法的控制性能更加优越。

Aiming at the problems of system chattering and large errors in rotational speed and position of traditional sliding-mode observer(SMO)algorithm for sensorless controlled permanent magnet synchronous motor,an improved SMO algorithm is proposed.The estimated back electromotive force feedback is introduced,the saturation function is used instead of the switching function,and the variable reaching rate is used instead of the fixed sliding mode gain.The reliability of the system is verified by Lyapunov method,and the accurate rotor position and rotational speed information are obtained by phase-locked loop(PLL).Finally,Simulink is used to build a simulation model,and related experiments are carried out.The simulation and experimental results show that the improved algorithm’s control performance is superior.