| With the characteristics of high speed,low vibration,low noise and not limited by the wheel-rail adhesion limit,maglev train has become one of the important directions of rail transit development.High temperature superconducting(HTS)maglev technology is considered as a promising maglev technology because of its passive self-stable levitation characteristics.With the launch of the high-speed HTS maglev engineering test line and prototype vehicle,China has already started the process of engineering applications of HTS maglev systems.As an important part of HTS maglev system,the performance and stability of permanent magnet guideway(PMG)will directly affect the load capacity and safety of HTS maglev train.Therefore,it is necessary to optimize the performance and protection measures of PMG.The current research on the optimization of PMG is mainly in the perspective of optimizing the magnetic circuit,and few is from the statistical point of view.In this thesis,based on the PMG of the ring test line,the data set of PMG is established by the method of joint simulation and parametric scanning.Then,with the help of sensitivity analysis,the influence of the size parameters and grade parameters on the electromagnetic force of the HTS maglev system are investigated,and the optimization suggestions for the PMG are given.Finally,this optimization method is used to give a set of optimization examples of PMG.The optimization results show that the peak magnetic field above the PMG is increased by more than 10%.Moreover,the levitation force of the HTS bulk is increased by 2.14% and the guidance force is increased by 12.97%.At the same time,the quality of PMG protection measures will greatly affect its life and performance in the practical engineering application.Therefore,it is also necessary to conduct research on PMG protection measures.Based on the experience of the high-speed HTS maglev engineering test line,this thesis focuses on the PMG surface protection technology for indepth research.Firstly,the shortcomings of existing surface protection technologies for PMG are summarized.Then,a comprehensive study of applicability and economy is made,and a proposal is given to set up a multi-coat chemical protection system of epoxy zinc-rich primer,epoxy mio barrior paint and epoxy top-coat on the surface of PMG based on the plating protection of permanent magnets(PM).Finally,in view of the obvious effect of physical protection using metal protection plates on both the PMG and its surface coating,this thesis continues with the study of metal protection plates on the surface of the PMG.In the research process of PMG surface metal protection plate scheme,it is confirmed by a combination of simulation and experiment that the use of aluminum alloy protection plates will produce the additional effect of electrodynamics suspension.According to the results of eddy current simulation and actual operation experiment,the additional guidance force caused by metal protection plate on the surface of PMG is more obvious than the additional magnetic resistance and additional levitation force.Moreover,the magnitude of the additional force is on the rise with the thickness increase of the metal plate and the increase of the conductivity.By comprehensively comparing the material characteristics,economy and additional force of metal protection plate,the selection recommendation of 1.5 mm thick 6061 aluminum alloy protection plate for PMG surface is proposed.In summary,this thesis carries out research around the PMG technology and proposes a new idea of optimization and a surface protection scheme for PMG,which provides a theoretical reference for its engineering application. |
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