基于改进型SMO无位置传感器速度控制

Sensorless Speed Control Based on Improved SMO

针对传统SMO(Sliding Mode Observer)在开关函数切换过程中存在抖振现象,提出一种利用饱和函数代替开关函数的新型滑模观测器削弱抖振,并在位置信息提取过程中选用锁相环代替传统的反正切方法,从而提高对PMSM(Permanent-Magnet Synchronous Motor)转子位置的观测精度。在Matlab环境下,通过传统和新型SMO的对比,可观察到转子的转速误差提高了大约14 r/min,转子位置误差提高大约0.03 rad。

In response to the chattering phenomenon that traditional SMO(Sliding Mode Observer)faces during switching functions,novel sliding mode observer using saturation function instead of switching function is proposed to weaken chattering.In the process of extracting position information,a phase-locked loop is selected to replace the traditional arctangent method,there by improving the observation accuracy of PMSM(Permanent Magnet Synchronous Motor)rotor position.In the Matlab environment,by comparing traditional SMO and new SMO,it can be observed that the speed error of the rotor has increased by about 14 r/min,and the position error of the rotor has increased by about 0.03 rad.