Optimization And Analysis Of Permanent Magnet Track Of High Temperature Superconducting Maglev Train System

After decades of development,maglev technology has become increasingly mature,maglev train has become an important direction of new rail transit.Among various types of maglev trains,the high temperature superconducting maglev train based on pinning principle has attracted the attention of many scholars at home and abroad.The magnetic field of the high temperature superconducting maglev train is provided by the permanent magnet track.The size of the magnetic field directly affects the suspension force and guiding force of the suspension system,and the size of the suspension force and guiding force directly determines the performance of the maglev train.In order to improve the magnetic field of the permanent magnet track and improve the performance of the maglev train,this paper focuses on the study of the influence of the structure size of the single-peak and double-peak permanent magnet track on the magnetic field,and obtains the optimization track model.Based on the optimization track,the multi-layer structure is used to put forward the improved suspension frame system,which increases the suspension force and avoids the occurrence of derailment accidents.The specific research content is as follows:Taguchi experiment was designed,and the finite element software Ansoft Maxwell was used to simulate and calculate the average magnetic field intensity of the20 mm plane above the single-peak permanent magnet orbit and the 20 mm magnetic field evaluation line above the bimodal permanent magnet orbit.The average magnetic field intensity per unit mass was calculated,and the influence of permanent magnet structure size on the magnetic field performance of single-peak and bimodal permanent magnet orbit was studied.The influencing factors were optimized with the objective of optimizing the comprehensive magnetic field performance,and the track size was optimized by comparing the comprehensive magnetic field performance,and the magnetic field performance of single-peak permanent magnet track and double-peak permanent magnet track was optimized.After comprehensive analysis,working condition 20 is the optimal working condition size of bimodal permanent magnet track,that is,section width of A is 40 mm,section width of B is 50 mm,section height is 30 mm and pure iron thickness is 6mm.It provides the basis for the design of permanent magnet track.It provides the basis for the design of permanent magnet track.Based on the frozen mirror model,an equivalent treatment method for high temperature superconductors(referred to as equivalent treatment method)was proposed.Experiments on the combination of high temperature superconductors and the suspension force between permanent magnet orbits were carried out with experimental equipment.The correctness of the equivalent treatment method was verified by comparing the experimental data with the simulation data.The suspension force and guiding force of the bimodal experimental track and the bimodal optimized track were calculated by simulation to verify the correctness of the optimization design.The suspension force under different arrangement of high temperature superconductors was calculated and analyzed,and the relationship between suspension stiffness and the number of rows of high temperature superconductors was studied.It was concluded that suspension stiffness increased rapidly with the increase of the number of rows of high temperature superconductors.The suspension force and guiding force of large size high temperature superconductor blocks with different field cooling heights are concluded that the maximum suspension force increases,the maximum guiding force decreases,and the suspension stiffness and guiding stiffness decrease with the increase of field cooling height.Based on the frozen mirror model,an equivalent treatment method for high temperature superconductors(referred to as equivalent treatment method)was proposed.Experiments on the combination of high temperature superconductors and the suspension force between permanent magnet orbits were carried out with experimental equipment.The correctness of the equivalent treatment method was verified by comparing the experimental data with the simulation data.The suspension force and guiding force of the bimodal experimental track and the bimodal optimized track were calculated by simulation to verify the correctness of the optimization design.The suspension force under different arrangement of high temperature superconductors was calculated and analyzed,and the relationship between suspension stiffness and the number of rows of high temperature superconductors was studied.It was concluded that suspension stiffness increased rapidly with the increase of the number of rows of high temperature superconductors.The suspension force and guiding force of large size high temperature superconductor blocks with different field cooling heights are concluded that the maximum suspension force increases,the maximum guiding force decreases,and the suspension stiffness and guiding stiffness decrease with the increase of field cooling height.A novel suspension system with "sandwich" structure was proposed.The suspension force and guiding force of high temperature superconductor unit were calculated based on equivalent treatment method.According to the structural characteristics of the new suspension system,the suspension force and guiding force of the suspension frame are explored.In the calculation of guiding force,the influence of two different arrangements of permanent magnet orbit on guiding force is explored.The levitation force and steering force of a single maglev train were calculated whether gravity was considered or not,and the vertical dynamics model was established and the dynamics analysis was carried out.It was concluded that the new sandwich suspension system has better levitation and steering performance than the traditional high temperature superconducting permanent magnet maglev system.