Sensorless Control Of PMSM Based On Load Torque Feedback

Permanent magnet synchronous motor(PMSM)has obvious advantages in design and performance,and has broad application and development prospects.With the deepening of research,the development and progress of technology,PMSM has made great progress in material science,control and other fields.PMSM has broad application and development prospects in industrial production,rail transit,aerospace and other fields.However,with the development of industrial technology,PMSM is required to cope with more and more complicated working environment.Therefore,in order to obtain excellent control performance,more superior control strategy is needed.In this paper,the speed closed loop and sensorless control of PMSM are designed and studied.The main contents of this paper are as follows:First,the mathematical model of PMSM is briefly introduced.A PMSM dynamic surface control scheme based on load torque feedback is proposed to solve the problem that the performance of PMSM control system decreases due to load variation during operation of PMSM.The motion equation of PMSM is established,a new state variable equation is defined,and a new dynamic surface sliding mode controller is designed.A disturbance observer with exponential convergence is used to obtain the load torque feedback.And the high precision control of PMSM is realized.The simulation results show that the new control strategy designed in this paper can effectively suppress the control performance fluctuation caused by load torque because of its new mathematical model.Compared with the linear adrc strategy,the disturbance response is fast and robust.Second,an integral sliding mode observer is proposed for the low accuracy of rotor position and speed estimation of the observer in the sensorless PMSM control scheme.Firstly,a sliding mode surface with integral mathematics is designed,so that the designed observer has the advantages of non-singularity,fast error convergence and good chattering suppression effect.Then,the control law of sliding-mode observer is derived by combining the fast power approach law.Finally,the position parameters and speed parameters of the rotor are derived by using the PLL system.The simulation results show that compared with the traditional integral sliding mode observer,the proposed sliding mode observer can effectively improve the parameter estimation performance of PMSM,and the system has good dynamic and static responses.Last,the simulation model was built to verify the rationality of the proposed control scheme from the theoretical perspective in the Matlab environment.DSP platform is built to prove the possibility of digital realization of control means from the experimental point of view.Figure[41]table[4]reference[61]...