永磁同步电机改进滑模观测控制研究

Improved Sliding-mode Control for Permanent Magnet Synchronous Motor

针对永磁同步电机(Permanent Magnet Synchronous Motor,PMSM)永磁体磁链为常数的特点,本文对其d-q轴模型进行分析,结合滑模控制原理,研究了永磁同步电机的滑模观测无传感器控制策略。为了更精确的估计PMSM转速和转子位置,本文提出了一种改进型滑模观测器,采用自定义Sigmoid函数代替Sat函数作为滑模观测器的切换函数,提高滑膜观测器的运行精度和动静态稳定性。在Matlab/Simulink中建立了永磁同步电机滑模控制模型,并进行了仿真实验。仿真结果证实改进滑模转速辨识方法在PMSM无速度传感器控制系统中具有更强的鲁棒性和更好的动静态性能。

As for Permanent Magnet Synchronous Motor,permanent magnet flux is constant;this article analyzes the d-q axis model,applies voltage space vector pulse width modulation technology (SVPWM)control method,combining with sliding mode control principle,the sensorless control strategy for synovial observation of PMSM is studied.This paper discusses the method of establishing SVPWM control system and sliding mode observer of permanent magnet synchronous motor.In Matlab/Simulink,the model of the sensorless control system of permanent magnet synchronous motor is established and the simulation experiment is carried out.The simulation results show that the improved sliding speed identification method has stronger robustness and better dynamic static performance in the PMSM speed sensor control system.