Research On Adaptive Sliding Mode Disturbance Rejection Control Of Permanent Magnet Synchronous Motor

With the development of permanent magnet materials,permanent magnet synchronous motor(PMSM)has been widely used in industrial production,robotics,rail transit,aerospace and other fields.Due to the increasingly diversified and complicated application fields and working environment of PMSM,point at the speed tracking problem of speed regulation system,to further improved the control accuracy of permanent magnet synchronous motor and ensure the stability of permanent magnet synchronous motor in complex environment.,consider the multi-variable non-linearity and strong coupling characteristics of permanent magnet synchronous motor and the internal parameter perturbation and external disturbance problems of the motor.An adaptive sliding mode anti-interference control method is studied.The main contents of this paper are as follows:(1)Conducted an improved sliding mode disturbance rejection control method based on elastic energy function:the elastic energy function was used instead of the symbol function which improve the exponential reaching law to suppress the sliding mode chattering problem;the extended state observer was introduced to estimate and compensate the unknown function of the control system and the external disturbance,which solves the contradiction between the strong anti-interference of sliding mode control and the elimination of chattering;the tracking differentiator was used to track the input signal and obtain the differential signal required by the controller.Finally,the stability law of the control system was proved by the stability law of Lyapulov,and the effectiveness of the improved control method was certified.(2)The adaptive sliding mode disturbance rejection control method was applied to the controller design of speed control system.Considering the disturbance effect caused by the sudden change of load torque of permanent magnet synchronous motor,the extended state observer was used to compensate the load disturbance for feedforward observation which can cancel out the negative impact of the disturbance.In order to avoid control overshoot and obtain differential signal,the tracking differentiator was used to arrange the transition process when the desired velocity is a step signal.The problem is solved and differential quantities are obtained.Finally,through MATLAB/Simulink simulation contrast experiment,it is proved that this control method can effectively improve the response speed,strong anti-disturbance ability,high control accuracy and no sliding mode chattering phenomenon.An adaptive sliding mode disturbance rejection control method is designed by combined the extended state observer and tracking differentiator with sliding mode controller,and applied to the speed control system of permanent magnet synchronous motor.This control method not only has the characteristics of strong robustness and fast response,but also effectively suppresses the sliding mode high frequency chattering phenomenon,improves the dynamic performance of the system.The method not only has the characteristics of strong robustness and fast response,but also effectively suppresses the sliding mode high frequency chattering phenomenon and improves the dynamic performance of the system,which has highly theoretical significance and great practical application prospects in permanent magnet synchronous motor control field...