基于滑模观测器的PMSM转子位置估计

PMSM rotor position estimation based on sliding mode observer

针对传统滑模控制易导致系统出现抖振的问题,提出了一种基于双曲正切函数改进的控制算法来实现永磁同步电机无传感器控制。为了减小观测器系统抖振,通过反馈增益和开关函数常值的调节,并利用锁相环技术提高估算精度,削弱计算噪声。基于MATLAB/Simulink软件平台搭建了仿真模型,将改进后的的滑模观测器和传统的滑模观测器法进行对比。结果表明,与传统的滑模观测器相比,改进的滑模观测器能够快速、有效地跟踪转子位置,精确估算出转子速度,同时具有较好的动态特性。

Aiming at the chattering problem of traditional sliding mode control,an improved control algorithm based on hyperbolic tangent function is proposed to realize sensorless control of PMSM.In order to reduce the chattering of the observer system,the feedback gain and the constant value of the switching function are adjusted,and the PLL technology is used to improve the estimation accuracy and reduce the computational noise.The simulation model is built based on MATLAB/Simulink software platform,and the improved sliding mode observer is compared with the traditional sliding mode observer method.The results show that compared with the traditional sliding mode observer,the improved sliding mode observer can track the rotor position quickly and effectively,estimate the rotor speed accurately,and has better dynamic characteristics.