Research On Design And Damping Characteristics Of Electric High-speed Maglev Linear Generator

Railway transportation has become the main method of road transportation in countries all over the world due to factors such as large transportation volume,low cost,and convenience.However,compared with air transportation,the shortcomings of railway transportation speed also limit its development.The concept of magnetic levitation overcomes the limitation of wheel rail system friction and greatly improves the train speed.With the continuous development of maglev train technology,ordinary contact power supply methods can no longer meet the power supply requirements of trains at ultra-high-speed operation,and contact power supply requires additional power supply lines,and there are problems such as maintenance,switching,and friction.Type power supply also limits the increase in train speed.The induction power generation device has the advantages of high efficiency,safety,noiselessness,and convenient maintenance.It is applied to the maglev train.Because the physical connection with the external power supply device of the train is eliminated,the train running speed can be greatly improved.First,this thesis introduces the research background of the subject and the application of linear motors on maglev trains,and then analyzes in detail the principles and differences of different types of maglev train power generation systems.After that,it introduces several principles of wireless power generation,and then compares them.The difference is that the linear generator is selected as the on-board power supply method of the maglev train.Then,based on the design of Japanese EDS maglev train,this thesis analyzes the electromagnetic field generated by the superconducting coil using the space harmonic method,and integrates the magnetic field at the position of the levitation coil in the area where the levitation coil is located to obtain the cross-link Then,the induced electromotive force in the levitation coil is calculated,and the current induced in the levitation coil is calculated based on its resistance and inductance.The fundamental wave current and the third harmonic current component account for the largest proportion in the suspension current.For simple calculation,the magnetic field generated by these two parts of the current is taken for analysis,and it is found that the fundamental wave magnetic field and the fifth harmonic magnetic field account for the largest proportion,which is also due to the fundamental wave magnetic field.Compared with the running maglev train,it is a static magnetic field,which cannot be used to generate electricity.Therefore,we design the collector coil according to the characteristics of the fifth harmonic magnetic field of the suspension coil.According to the power supply requirements,in-depth analysis of the connection mode of the collector coils was carried out to design the parameters of the linear motor that can meet the power supply requirements of the high-speed maglev train.Finally,because the electric superconducting magnetic levitation system itself has relatively low inherent damping,in order to improve the magnetic damping,this thesis proposes an arrangement of collector coils by changing the arrangement of the collector coils and controlling the zero sequence in the collector coils.Electric current can obtain controllable electromagnetic force,thereby increasing the damping force of the maglev system.This thesis mainly analyzes the influence of zero sequence current on the magnetic damping of the maglev train,and calculates the magnetic damping produced by the collector coil under the working conditions such as the lateral deviation of the train and the change of the levitation height.The effect of current collector coil on train operation during rolling.Through analysis,it can be known that when the zero-sequence current is 100 A,the electromagnetic force of the train in the levitation direction can reach about 4000 N,and the electromagnetic force in the horizontal direction can reach about 2000 N.When the train is in any abnormal operation posture,the zero-sequence current All types of collector coils can provide stable electromagnetic force to increase the stability of the train during operation.