Characteristic Analysis Of Linear Generator In High Speed Maglev System Under Multi Attitude Condition

With the continuous development of human society and economy,the long-distance personnel exchanges and material exchanges between cities are becoming more and more frequent,and higher requirements are put forward for the timeliness,comfort and safety of vehicles.High speed maglev train has the advantages of high speed,high safety,energy saving and environmental protection,low mechanical noise and so on.It has become a research hotspot and future development trend in the field of transportation in recent years.When the maglev train is running at high speed,the traditional contact power supply mode will produce serious friction heating,which seriously affects the safe and stable operation of the train.The non-contact power supply mode based on the principle of electromagnetic induction linear generator has become the preferred choice of high-speed superconducting maglev train.In this thesis,the finite element method is used to study the characteristics of linear generator of high-speed superconducting maglev train under multi attitude condition.Firstly,the advantages and disadvantages of various train power supply modes are summarized,and the feasibility of using linear generator for power supply is determined.This thesis reviews the development of maglev train at home and abroad,expounds the suspension principle,guiding principle and propulsion principle of superconducting maglev train,summarizes the advantages and disadvantages of maglev train,and summarizes the research results of linear generator at home and abroad.Secondly,the topology of the linear generator is explained,the structure and advantages and disadvantages of the vehicle power supply system are introduced.The generating principle and the frequency of the magnetic field harmonic used in the generation are discussed by the analytic method and the finite element method.The three-dimensional transient model of linear generator is established by using ANSYS Maxwell.The distribution characteristics of air gap magnetic field of linear generator are calculated and analyzed.The main harmonic components in air gap magnetic field are given,and the number of harmonic generation is determined.Then,ANSYS Maxwell is used to simulate the linear generator with different running speed,suspension height and pitch angle.The influence of the above conditions on the power generation and force characteristics of the linear generator is studied in detail.The variation trend and reasons of the induced current and air gap magnetic field of the levitation coil,the induced current and induced electromotive force of the collecting coil,the output power of the linear generator,the total suspension force of the train and the electromagnetic force of the collecting coil in different directions are analyzed.Finally,the adverse effects of the eddy current generated on the dewar shell on the power generation characteristics of the linear generator are studied,and the optimization design scheme of the dewar shell is proposed,and the performance improvement effect of the optimization scheme on the linear generator is evaluated.