基于改进型滑模观测器的永磁同步电机转速辨识

Improved Sliding-Mode Observer for Speed Identification of Sensorless Permanent Magnet Synchronous Motor

提出了一种改进型滑模观测器,用于永磁同步电机(PMSM)无速度传感器控制系统的转速辨识。针对机械式传感器引起的永磁同步电机矢量控制系统可靠性的下降、安装布置时空间局限性和传统滑模观测器抖振问题,改进型滑模观测器分别在切换函数、开关增益、速度估算三个方面进行了综合改造,用饱和函数代替符号函数,可变开关增益替代固定开关增益,锁相环替换直接计算法,较大程度上削弱了抖振,加快了收敛速度,同时提高了转速辨识精度。

This paper proposes an improved sliding-mode observer（SMO） to identify the speed of sensorless permanent magnet synchronous motor（PMSM） control system.In order to overcome the decline of reliability of PMSM vector control system,the limitation of installation and the chattering problem of the conventional SMO.The improved SMO has three aspects include that the switch function,switch gain and speed estimation,and carry on the comprehensive transformation which make use of saturation function instead of sign function,a variable observer gain instead of fixed gain and phase-locked loop to replace direct calculation method.