Research on Coupling Property of Vertical and Transverse Force of Maglev Platform

Maglev platform is a support platform which has special advantages, such as no contact， no lubrication, easy maintenance, long service life and high precision. It has a very broad application prospects. In the research of maglev platform, the design and optimization of electromagnets is critical. In this paper, the overall structure of the maglev platform and electromagnets has been introduced firstly. According to the technical requirements with large span and big air gap, the parameters of iron cores and coils are given for the following calculation and simulation. Secondly, in order to study the property of vertical and transverse force produced by the electromagnets of maglev platform, the calculation based on magnetic circuit method of the bearing force of toroidal and U-type electromagnets are carried out. Mathematical analytical model of vertical and transverse magnetic force was deduced by using virtual displacement method. The vertical and transverse magnetic force dependence on vertical gap and transverse displacement was analyzed. Coupling between vertical and transverse magnetic force was studied. The forces was simulated by finite-element method and the simulation results were compared with the calculated results. Theoretical results for designing vertical and transverse decoupling control system were provided. Lastly, the bearing capacity, magnetic field distribution and magnetic induction intensity of the simulation model, which is established based on previous parameters, are analyzed through Ansoft finite element method. Combining with smoothing and trimming, defects of the electromagnets are improved. The result of analysis on the characteristics of the electromagnets is helpful to improve the control precision and stability of the platform, and the study of the issue involved has very high theory value and realistic significance.