Study On Driving System Of Evacuated Tube HTS Side-suspended Maglev Train

In the long history of human development,the pursuit of more efficient and comfortable means of transport has always been the trend of social development.In ancient times,soldier riding,officials sedan,today’s human travel is mainly dependent on cars,high-speed rail,aircraft and other means of transport.At present,high-speed rail and aircraft is still the mainstream of high-speed public transport,China’s high-speed rail in the world get a lot of attention.However,in the future of higher speed,high-speed rail train due to wheel-rail friction mechanism led to limited speed to enhance the space,so the urgent need for a speed of 600km/h above ground transportation to fill this area.The combination of evacuated tube and maglev traffic will be a strong competitor.Southwest Jiaotong University as a pioneer in the domestic rail transportation industry,as early as 2011 began on the research of evacuated tube high temperature superconducting magnetic levitation system.In order to solve the problem of centrifugal force running in the evacuated tube ring line,the design and construction of the evacuated tube HTS side-suspended maglev system.It’s means that vehicle is hanging on the side,and the linear induction motor is use of as a drive.In this paper,the characteristics of the linear induction motor driven by the side-suspended system of the evacuated tube are analyzed with the linear induction motor as the research object.Firstly,the structural parameters of the evacuated tube HTS side-suspended system is introduced,and several main constituent systems of the vacuum pipe are introduced:linear motor drive system,segmented power supply control system and measuring system.Secondly,the static characteristic test platform of linear motor is introduced,and the relevant static starting thrust of linear motor is experimented on this platform.Finally,based on the theory of rotating electrical machine,the electromagnetic theory of linear motor and the special characteristics of linear motor and rotary motor are introduced.The equivalent circuit model of linear induction motor is given.Then,the composite secondary linear induction motor model is established,and the effect of compound secondary parameters on the starting thrust and normal force of the motor is analyzed by the stratified theory model.The relationship between the driving performance of the linear induction motor and the composite secondary parameters is verified by the finite element simulation.The aim of this paper is to investigate the influence of the secondary secondary on the thrust of the linear induction motor.According to the static test results of the linear induction motor,the correctness of the simulation model and the result is verified,which provides the design reference for the high speed evacuated tube HTS side-suspended maglev system.Then,the effect of centrifugal effect on the driving performance of linear induction motor was studied by experiment and simulation.The results show that the thrust of the linear induction motor decreases with the increase of air gap and lateral displacement.This part is designed to explore the reasonable vertical displacement and lateral displacement range,which can be used as a reference for the design of the initial floating position of the HTS maglev for side-suspended evacuated tube.Finally,according to the dynamic experimental data of the evacuated tube HTS side-suspended maglev system,the variation of the resistance of the magnetic vehicle under different air pressure in the evacuated tube is studied,and then obtains the change of driving thrust in the acceleration process.Derives the empirical expression of dynamic resistance and thrust.