Design And Simulation Analysis Of High Temperature Superconducting Maglev Train System

Since the discovery of high temperature superconducting(HTS)phenomenon,HTS materials,working mechanism and application technology have been studied rapidly and extensively,which provids new technology solutions for device technology in many fields.In the practical application,HTS materials are mainly composed of bulks,tapes and films,and the HTS bulks based on its flux pinning properties and Meisner effect and high magnetic field capture ability have been widely used in motor,electric power,high-energy physics,transportation and other fields.They can be used to the linear motor so that the new linear motor has a greater advantage than the traditional linear motor.Based on the characteristics of magnetic flux pinning,the levitation force can be generated under the external field,and the system has the self-levitation self-guidance function.Therefore,the combination of HTS linear motor and HTS maglev subsystem can achieve the integration of suspension,guidance and propulsion superconductivity,and form a real sense of energy saving.This paper focuses on the key technologies of propulsion system and suspension system in HTS Maglev train system.First,the evolution process,classification and theoretical principles of the traditional linear motor are introduced.When the HTS materials are applied in linear motor,five application modes of HTS linear motor are obtained,and the structure and theory of the HTS linear motor are introduced.Then the theoretical model of HTS bulks magnet is described and summarized,including critical state model,sand pile model and “surface current + body current” model.According to the theoretical model of HTS bulks magnet,a HTS linear motor model can be obtained,and the thrust characteristics and normal force characteristics are studied through the double reaction theory.At the same time,the magnetomotive force and equivalent magnetic circuit of HTS linear motor are analyzed in detail.Secondly,the single-side HTS linear synchronous motor is designed based on the theoretical model,which is applied to the propulsion system of maglev train speed of 1000km/h.And the related structure and size of the single-side HTS linear motor is designed,according to the physical model and size,the simulation model is established in the finite element simulation software,and the related electromagnetic analysis was carried out.Finally,the structural design of HTS maglev subsystem,theoretical analysis model and finite element analysis are completed based on the pinning properties of HTS bulks.The physical models of three kinds of permanent magnet guideways(PMGs)are established.The electromagnetic analysis of PMGs are carried out by surface current model,and the magnetic flux density distribution at any point above the PMGs is obtained,then the rationality of the model is verified by the finite element simulation analysis.The force model between HTS bulks and PMGs can be obtained through the established model of PMGs that provides a theoretical basis for the levitation and guidance performance of the suspension system.Then the levitation characteristics of different mode maglev trains are compared and analyzed.