The Dynamic Model And Characteristics Of A Planar Magnetic Levitation Platform

Magnetic suspension technique is a newly advanced technique in recent years. Because of no mechanical contact, no wear, low power loss, no need of lubrication and long service life, ect, it has great exertions on the transformation from traditional mechanical product to mechatronics product. On the research of ultra-precision work platform for quick orientation and close motion, the application of magnetic suspension technique is helpful to improve the performance of platform prominently.In this paper, with the research object of magnetic levitation platform, a test sample machine is designed and made. It is analyzed the static mechanical properties of the magnetic levitation work platform with using the finite element method and established the dynamic model of the maglev work platform. The dynamic characteristics of the magnetic levitation work platform are researched. The natural frequency of the electromagnet base is analyzed by the simulation and experiment. The primary work and research results are as follows:(1) With the research of the home and abroad magnetic platform, a test sample which can achieve a large linear motion plate is designed and made. The statics analysis is studied. The deflections of the maglev platform are analyzed with using Ansys software under the states of suspension and non-suspension. The maximum deformation is4.9μm with no suspending and3.85μm with1×107N/m of the spring stiffness and the results show that the overall design of the platform has a good rigidity.(2) A dynamic model of six degree of the freedom Mag-Lev work platform is set up. The Mag-Lev work plate is researched with the modal analysis and the transient response analysis. The influence of the magnetic work platform U-shaped electromagnet stiffness on the natural frequencies is investigated. With using the decoupling and solution principle of multi-degree of freedom system with forced vibration, the transient response analysis of magnetic work platform is studied in different stiffness and damping and the effect of the stiffness and damping is worked too.(3) The modal analysis of the electromagnet base is worked. With using the spectrum analyzer, it is tested the nature frequencies of the electromagnet base. It is verified the validity of the result of the modeling and analysis of finite element method.