Research On Robust Sliding Mode Control Algorithms For Permanent Magnet Synchronous Motor

With the advantages of high operating efficiency,small size and simple structure,the Permanent Magnet Synchronous Motor?PMSM?has been widely applied to engineering practice.However,PMSM is easily affected by uncertain factors,such as external disturbance during operation,thus if it cannot track to a given position,the system control requirements cannot be met in the case where the position requirements are relatively high.In order to track to a given position as soon as possible when the PMSM is disturbed and meet the need of stability and robustness during the operation of the PMSM,the Paper,taking PMSM position control as the research content,adopted the PMSM L₂ sliding mode control method to control the position and analyzed the performance of the controller.Firstly,after introducing the common control method of PMSM and the development of Position Control Strategy for PMSM,the Paper analyzed the vector control principle and then,with the adopting of control method of id =0,established the Mathematical model of the PMSM control system according to the structure and principle of PMSM.Secondly,for the parameters of the traditional PID control method cannot be changed according to the changes of the system,thus the accuracy and stability of the system control cannot be guaranteed,and the anti-interference ability cannot meet the requirements,which can be made up for by the sliding mode control theory.Therefore,the Paper derived the L₂ sliding mode controller and proved the effectiveness and robustness of the controller after making simulation comparison with the sliding mode control method based on exponential approach law.Then the simulation model of L₂ sliding mode control algorithm of PMSM is established by using MATLAB/Simulink,and the position deviation of PMSM is taken as the input of the controller to form a position outer loop,which is combined with the current inner loop control to form a double closed loop control.Besides,after the detailed simulation experiments under the L₂ sliding mode control algorithm of the PMSM and the traditional PID control method used in this paper,the paper verified the strong anti-interference ability of the control method theoretically.Finally,in order to further verify that the L₂ sliding mode control method of PMSM enjoys better stability and anti-interference ability in tracking a given position,this paper,using TI company TMS320F28335 as the control chip to build the experimental platform of PMSM position control,verified the superiority of the L₂ sliding mode control method of PMSM by comparison experiment with the PI control method.