Research On Permanent Magnet Electrodynamic And Electromagnetic Hybrid Suspension System For Vacuum Tube Maglev Transportation

Vacuum Tube Maglev Transportation(VTMT)is a new kind of transportation,which builds a vacuum environment inside the tube,and puts the maglev train inside the tube.In this way,both of mechanical friction and air resistance are eliminated.VTMT is expected to be the next generation of ground super-high speed transportation.In this paper,a hybrid suspension supporting structure of VTMT is designed,which consists of permanent magnet electrodynamic suspension and electromagnetic suspension,to assure the maglev train can travel safely and fast in the vacuum tube.This structure not only improves the space utilization ratio of the vacuum tube,but also overcomes the shortage of single EDS or EMS,and has advantages of economic,energy conservation,good stability and controllability.The main contents of this paper are as follows:(1)Aiming at the problems of suspension system of VTMT existing by now,a spatial “Four point suspension” hybrid suspension system is developed,which consists of permanent magnet electrodynamic suspension and electromagnetic suspension.The EDS system and EMS system are preliminarily designed,as well as the tube and the train body.(2)In order to improve the utilization of magnetic energy of permanent magnet,the EDS system is further optimally designed.The optimal structure of Halbach array and permanent magnet modules are obtained by theoretical calculation.By means of Ansoft Maxwell,a kind of finite element tool,suitable levitation gap and track structure are accessed,thus the main structure parameters of EDS system are accessed.(3)Using Ansoft Maxwell,permanent EDS system and EMS system are simulated separately.As for the permanent EDS system,the magnetic field distribution,the relation curves of lift force and drag force vs.velocity are obtained,proving double side Halbach array is more suitable for VTMT.As for the EMS system,the magnetic field distribution,the relation curves of electromagnetic force and drive force are obtained,armature and exciting currents of EMS system are determined.(4)An experiment platform of permanent magnet EDS system is developed,to prove the practicability and rationality of the system.A simple EDS system is designed and developed,the principal of lift force and drag force is measured,the validity of theoretical design and simulation is confirmed.By contrast to single side Halbach array,the rationality and superiority of double side Halbach array is proved.