Optimization Design And Stability Analysis Of Repulsive Magnetic Levitation System

Magnetic levitation technique has great potential in maglevs,supporting platform and precision positioning system due to its non-contact,low power consuming characteristics.In order to reduce the power consuming and simplify the mechanism of system,the permanent magnet is introduced in the system to provide the vertical levitation force rather than by electromagnet.However,the load of the system depends on the permanent magnets,and the stability of the system depends on the electromagnetic coils,its specific structure and excessive air gap between the coil and levitation object cause the stability issues.Hence,improving the stability and maximum load of the system is essential objective for system design.This paper is focusing on the repulsive magnetic levitation system,designing the control circuit of the system and studying the main factors corresponding to load capacity based on the analysis of system principle,then the magnetic part of the system is optimized combining the finite element method and completed the prototype design.Finally,based on the optimization results and the circuit design,the stability of the system is evaluated.The specific contents are shown follow:(1)Completed the design of system control circuit,including sensor module,levitation object detection module and power drive circuit module.(2)Established the 3-D finite element model of the magnetic part of the system.Calculated the magnetic field distribution and the force of levitation magnet by the equivalent current method,and analyzed the main factors affecting the force of levitation magnet.Based on the model,completed the optimum design of the magnet part of the system and obtained the corresponding prototype of the system.(3)Completed the mechanical analysis of the system,established the mathematical model of the system.Based on the mathematical model,the corresponding stability analysis are carried out,including the effects of external disturbance types,control parameters and saturation phenomenon of control signals.Finally,the stability effects of the system is verified by means of experimental measurements.