Research On Permanent Magnet Synchronous Motor Control Scheme Based On Fuzzy Disturbance Observer

With the development of permanent magnet material technology,power electronics technology,computer technology and modern control theory,permanent magnet synchronous motor(PMSM)is attracting more and more attention.It is widely used in industrial,military,aerospace and other fields.In the field of industrial control,the traditional PI control is still the most important control mode.However,PMSM is a multivariable,strongly coupled nonlinear system,and inevitably exists changes in system parameters and load torque,which makes it difficult for traditional PI control schemes to achieve high performance control of PMSM.Therefore,it is of great theoretical and practical significance to study the high performance control scheme of PMSM.Firstly,the paper introduces the principle of vector control of PMSM and the mathematical model in dq coordinate frame.The vector control of i_d=0 is the basic control strategy of this paper.For PI-based double closed-loop PMSM drive system,the influence of the moment of inertia and the change of load on the system performance is analyzed.Secondly,a fuzzy perturbation observer(FDO)is designed for a class of systems with internal and external interference,and the design method of the adaptive law is given and the stability of the observer is proved by using the universal approximation characteristic of the fuzzy system.The designed FDO can accurately observe the lumped perturbations including the variation of internal parameters and the external disturbance,which lays the foundation for the design of high performance PMSM speed control scheme.Finally,considering the strong robustness of sliding mode control,a high performance sliding mode speed control scheme based on fuzzy perturbation observer(SMC-FDO)is designed by combining the sliding mode control.The stability of the system with the designed control scheme is proved by Lyapunov stability theory.Based on the MATLAB/Simulink simulation platform,the FDO and the SMC-FDO are simulated and analyzed.The physical experiment is carried out to verify the feasibility of the designed scheme through the physical experiment platform.The simulation and experimental results show that the designed FDO can observe the lumped disturbance of the system quickly and accurately.Compared with the traditional sliding mode control,the SMC-FDO effectively suppresses the slip Damping the problem;compared to the traditional PI control,with better dynamic and static performance and the ability to resist internal and external disturbance.