Design And Implementation Of Variable Structure Controller For Permanent Magnet Synchronous Motor

As a kind of motor equipment with wide application and reliable performance,permanent magnet synchronous motor has the advantages of high stability,high efficiency,light weight,low inertia,fast response,low manufacturing cost,simple structure and so on.There is a wide range of applications in various fields of PMSM.However,the PMSM also has several factors that affect its performance.For example,PMSM is a multi-variable,strongly coupled nonlinear system,and the control method needs to be improved,so the sliding mode variable structure control method can be used to control the PMSM.The sliding mode cannot be influenced by external disturbances with the advantage of strong robustness.However,the chattering phenomenon is its inherent property,and since the chattering in the approaching process is caused by the switch control,completely eliminating the chattering will also eliminate the robustness.Therefore,this paper improves the exponential approaching law to improve the performance indicators in the approaching process.First,this paper designs the PMSM controller based on the sliding mode variable structure controller.According to the characteristics of the PMSM,the classical exponential reaching law is improved,the system error square term is introduced into the reaching law,and the exponential reaching term is summed.The parameter relationship of the constant velocity approach item is adjusted,and its performance is verified by simulation.Secondly,a sliding mode controller based on the improved exponential reaching law is used to adjust the speed loop and current loop.And apply it in the design of sliding mode controller,design PMSM control system based on improved sliding mode controller and verify its performance improvement.After that,in order to improve the controller’s anti-disturbance performance when the load changes,a load torque observer is designed and combined with an improved SMC.MATLAB simulation is used to verify the effectiveness of the designed controller.Finally,the motion controller MAC1630 and related equipments of DCCE are used to design and test the program.