Nonlinear Control And Simulation Of Maglev Ball System

With the continuous progress of science and technology,magnetic levitation technology has become a hot research trend.As the research object of magnetic levitation technology,magnetic levitation ball has been widely concerned by researchers.Magnetic levitation ball system is a typical strong nonlinear,unstable system,the electromagnetism,materials science and control science and other fields,because of its strong nonlinear characteristics,the traditional controller is difficult to achieve good control effect,so look for ways to improve the overall performance of magnetic suspension ball control system is of great research value.This article first from the research and development of magnetic levitation technology is introduced,and then extended to the maglev ball technology,internal structure and working principle of magnetic levitation ball in detail,on the premise of familiar with equipment for system modeling,respectively,set up the linear and nonlinear model,and carries on the modeling and simulation in MATLAB,analyzes its own characteristics.Then,two kinds of variable structure controllers and a new type controller for magnetic levitation ball system are introduced respectively.(1)Anti-windup variable structure PI controller,and uese a linear model of magnetic levitation ball system in electrical flow,on the basis of the PI controller existing saturation phenomenon,considering the system resistance added to a saturated controller,in order to verify the feasibility of the controller,PI controller with variable structure PI controller is used in the comparison,join optimization,genetic algorithm,the value of the Verify the superiority of the controller.(2)The backstepping sliding mode variable structure controller adopts the linear model of magnetic levitation ball system under voltage,and combines the backstepping method with the sliding mode variable structure controller to establish the backstepping sliding mode controller.In view of external interference,the controller is compared with the sliding mode variable structure controller to verify the control effect of the controller.(3)three nonlinear controller for single input single output nonlinear system design of three nonlinear controller,uses a nonlinear model of magnetic levitation ball system,the controller structure is simple and easy to implement,deduces the corresponding three-step controller in MATLAB to simulation of the controller,and compared with step against sliding mode controller,The feasibility and robustness of the controller are verified.Last three kind of controller can be seen from the simulation results on the control effect gradually optimized,but can be very good control effect,on the control performance can make the ball quickly stable suspension in the equilibrium position,to verify that the tracking performance of the controller,the equilibrium position will be changed to sine signal,the system can still on the fast track the given signal,and the tracking effect is good.The feasibility of the three controllers is verified,which has a good reference value for other controls.