Permanent Magnet Synchronous Motor Controller Design Based On Adaptive Back-stepping Method

Permanent magnet synchronous motor(PMSM)has the advantages of wide speed range,high torque,and small torque ripple,which is widely used in various fields.However,the traditional PMSM control system ignores the impact of the nonlinear behavior of the controlled object and the external environment,so it is difficult to keep the stability in the complex environment.Therefore,it must be able to effectively solve the problems of PMSM,such as nonlinearity,multi parameter changes,disturbance,harmonic,noise control and so on,in order to further improve the control performance of PMSM.In order to reduce the influence of changes in inherent parameters on PMSM,based on the traditional PID vector control model,the new intelligent control theory is introduced into the PMSM control system based on the traditional PID vector control model.In this paper,A control strategy combining the back-stepping method with the adaptive method is studied.According to the adaptive reference model,the disturbance caused by some unknown factors or random factors can be modified dynamically to improve the robustness of the system.However,the traditional adaptive back-stepping method not only has a large amount of calculation and more parameters to be designed,but also can only be applied to the influence of three parameters such as rotor resistance,load and friction coefficient.According to the traditional adaptive back-stepping derivation process,it can be concluded that the final purpose of designing the controller is to compensate the current components of q axis.Therefore,a control strategy based on q axis current compensation control is proposed in this paper.The controller can not only dynamically suppress and eliminate the influence of parameter changes on the system by using the cross axis current,but also do not need to introduce too many parameters,which greatly simplifies the computation.It can not only keep the performance of the traditional algorithm,but also maintains good dynamic and static performance when the inductance of the stator changes.The integral part is introduced to enhance the stability of the controlled system,so that the controlled object has fast response and small overshoot.The simulation experiments show that the adaptive back-stepping controller can effectively reduce the influence of the change of the inherent parameters on the system,track speed for a given value quickly,and make controlled system into the steady state rapidly.Finally,the whole experimental device is developed,and the corresponding software systemis designed.The experimental results are in agreement with the simulation results,which prove the feasibility of the algorithm.