Research On Fast Control Prototype And Real Time Control Of PMSM Based On Sliding Mode Variable Structure

Permanent magnet synchronous motor(PMSM)is widely applied in many fields,such as daily life,industrial production,defense technology and so on,because of its advantages such as high efficiency,high power density,high dynamic performance and simple structure.However,PMSM is a strongly coupled nonlinear system,and in complex work environment,the performance of the control system will be affected due to adverse factors such as internal parameter perturbation and external load disturbance.In order to improve the control performance of PMSM,this paper combines the vector control strategy and sliding mode variable structure control method to study the current control and speed control of PMSM,and design the control system of PMSM based on the rapid control prototype system.Firstly,aiming at the shortage of PI control in conventional current controller,a strategy of current control based on fast terminal sliding mode is proposed.Considering the uncertainties of PMSM system under practical conditions,an adaptive fast terminal sliding mode control algorithm is designed to estimate the uncertainties,then the influence of the uncertainties is eliminated and the robustness of the motor control system is ensured.The effectiveness of the algorithm is verified by computer simulation.Secondly,aiming at the cause of chattering in conventional sliding mode control,an improved exponential reaching law is proposed and compared with the conventional exponential reaching law.Then the speed control strategy is designed based on the improved exponential reaching law.Considering the influence of external load disturbance,a load disturbance observer is designed to compensate the speed loop output and the anti-disturbance ability of the system is improved.The control performance and anti-disturbance ability of the anti-disturbance speed controller based on the new reaching law are verified by simulation.Finally,the hardware and software of the PMSM control system based on the rapid control prototype system is designed,and the experimental platform is set up to carry out the rapid control prototype experiment of the PMSM.The performance of the PMSM control system is verified by the experiment,and it has a certain application prospect.