Research On The Characteristics Of Traction,suspension And Guidance Systems For Embedded Medium And Low Speed Maglev System

Medium and low speed maglev train has the advantages of strong climbing ability,small turning radius,low vibration and noise,and low construction and operation costs.It has been proved to be the development direction of urban rail transit in the future and an important demand for the development of national rail transit.Compared with the traditional rail-holding topology,the new embedded structure for medium and low speed maglev systems can reduce energy consumption and construction costs,improve system safety,reliability and environmental adaptability,and further optimize the suspension system and guidance system.Therefore,this paper adopts the three-dimensional finite element analysis method to study the characteristics of traction,suspension and guidance systems of medium and low speed maglev system with the new embedded structure.Accordingly,the influence of the embedded topology on the medium and low speed maglev system is revealed.Firstly,the research background and significance of the subject are expounded,the development history,technical characteristics and internal relations of the current maglev train are summarized,and the characteristics and advantages of the embedded topology in the application of medium and low speed maglev are clarified.The research status of linear induction motors and levitation electromagnets for medium and low speed maglev trains is summarized,and the analytical basis for the traction and levitation guidance of the embedded maglev system is clarified.Then,using the ANSYS simulation software,a three-dimensional finite element model of the embedded medium and low speed magnetic levitation system is established to study the characteristics of traction,suspension and guidance system.When the train is in alignment with the track,the distribution of the air gap magnetic field and secondary eddy current of the linear induction motor under different power supply frequency,slip frequency and air gap height is analyzed.In addition,not only the influence of operating speed and height of air-gap on the suspension magnetic field is revealed,but also the traction force and suspension force characteristics are analyzed when the end effect and eddy current effect are clearly and is considered.Also,the different effects of railmounted topology and embedded topology on forces under the same conditions are comparatively studied.Finally,when the train goes through the curve and laterally offsets,with the increase of offset,the distribution,variation trend and distortion degree of each component of the air-gap magnetic field and suspension magnetic field in the lateral direction,as well as variation of each component of eddy current in the secondary aluminum plate with lateral offset are studied.The edge coefficients using the eddy current longitudinal component are defined to describe the lateral edge effects.The variation of traction force,suspension force and guiding force under lateral offset conditions is studied,which provides a theoretical basis for the design and realization of precise control of the embedded medium and low speed maglev system.