永磁同步电动机无传感器二阶滑模观测器仿真研究

Simulation research of the second order sliding mode observer of sensorless permanent magnet synchronous motor

针对永磁同步电动机无传感器控制采用传统滑模观测器引起的"抖振"现象,提出了一种基于二阶滑模控制方法的滑模观测器,并将其用于估算永磁同步电动机的转子位置和速度;采用Matlab/Simulink软件,分别在理想情况及存在参数摄动情况下,对永磁同步电动机采用传统滑模观测器和二阶滑模观测器控制时的转子位置和速度进行估算,结果表明该二阶滑模观测器在没有低通滤波器的情况下即可得到平滑的电动机速度和位置估算曲线,估算误差较传统滑模观测器小,且具有更高的观测精度和更好的鲁棒性。

For eliminating chattering caused by traditional sliding mode observer used in sensorless control of permanent magnet synchronous motor, a sliding mode observer based on the second order sliding mode control method was proposed to estimate position and speed of rotor of permanent magnet synchronous motor. The position and speed of rotor were estimated separately by traditional sliding mode observer and the second order sliding mode observer in Matlab/Simulink software under ideal condition and parameter perturbation condition. The results show that the second order sliding mode observer can obtain smooth curves of estimated position and speed of rotor under the condition of no low pass filter with smaller estimation error, which has better observation precision and robustness.