Research On Permanent Magnet Synchronous Motor Control System Based On New Active Disturbance Rejection Control

Permanent magnet synchronous motor(PMSM)is widely used in industrial production because of its structural characteristics,such as high power density,high positioning accuracy and fast response.However,PMSM has strong coupling,non-linearity and other adverse factors,so a better control strategy is needed.General control methods are difficult to control effectively.In this paper,active disturbance rejection control(ADRC)is applied to PMSM servo system,which can effectively improve the anti-interference ability and control accuracy of PMSM.Firstly,according to the physical structure of the permanent magnet synchronous motor,reasonable assumptions and simplifications are made.The mathematical model of permanent magnet synchronous motor(PMSM)is analyzed,and the reasons of strong coupling and non-linearity in PMSM are obtained.On this basis,the mathematical model of permanent magnet synchronous motor in three-phase stationary coordinate system is obtained.The mathematical model of PMSM in two rotating coordinate systems is obtained by coordinate transformation.Secondly,this paper expounds the principle of the traditional ADRC and describes the composition and function of each part in detail.Because the nonlinear function of traditional ADRC is not differentiable at the origin,it will lead to high frequency chatter and other uncontrollable factors.So the interpolation fitting method is used to construct a new type of nonlinear function,which can be differentiated at the origin and boundary points,and the new type of nonlinear function is applied to the ADRC to obtain an improved ADRC.The stability analysis,convergence proof and parameter tuning of the improved ADRC are carried out,which proves the effectiveness and feasibility of the improved ADRC.Then,when the PMSM servo control system is running,it is necessary to effectively control the position loop,speed loop and current loop respectively according to the principle of separation and setting.In this paper,an improved ADRC for PMSM servo control system is designed.The second-order ADRC is constructed for the position loop,speed loop and current loop.And then the three control systems are combined into a whole control system to achieve effective control of the PMSM servo system.Finally,the simulation and experimental results show that the performance and control precision of the improved ADRC are better than those of the traditional ADRC.The improved active disturbance rejection controller designed in this paper has achieved the ideal control effect and proved its good control performance.The permanent magnet synchronous motor controller based on improved ADRC has better control performance and anti-disturbance performance,and has good development prospects.It provides valuable exploration for high-precision and anti-interference control of permanent magnet synchronous motor in complex environment.