A Study Of EMS Type High Speed Magnetic Levitation Vehicle's Electromagnetic Systems

Following the progress of national economy, the traffic and transport are more and more strain and becoming an important factor of restricting the economic development. Currently the traffic condition cries for relax and improvement. As a new-style land vehicle, the magnetic levitation vehicles rely on electromagnetic forces to suspend the train on the railway and advance by linear synchronous motor. They can run placidly at high speed without wheels and transmission machines. Since the magnetic levitation vehicles have low maintenance prices and circumstance pollution, They have favorable development foreground.An EMS high-speed magnetic levitation vehicle is driven by long stator linear synchronous motor. As the rotor of the linear synchronous motor, the suspending electromagnetic irons are excited by rotor current and act with the long stator railway mutually. They have multiform functions such as suspending, advancing and generating electricity. The distributing and changing rule of the vehicle's air-gap magnetic fields are of great important influence on the performance of vehicle's levitation, advancing, guiding and the generating electricity system on board. The study of the EMS high-speed magnetic levitation vehicles'electromagnetic systems has important directive meaning to the design and control of the vehicle's electromagnetic systems. It can provide powerful ensure for the study of homemade high-speed magnetic levitation vehicle technology.Based on the national high technology project named"The Study of the Magnetic Levitation Vehicle's Electromagnetic Field", this paper made analytic and numerical analysis of the EMS high-speed magnetic levitation vehicle's electromagnetic systems, designed the automatic magnetic fields measurement system for high-speed magnetic levitation vehicles and applied it to measure the air-gap magnetic fields of the EMS high-speed magnetic levitation vehicle's experimental system. The paper also studied the soft measurement technology of the high-speed magnetic levitation vehicle's electromagnetic forces when it is moving. The main content and innovation include:1. The electromagnetic model of the EMS high-speed magnetic levitation vehicle is established. Based on the analytic analysis of the linear synchronous motor's layered model, the paper deducted the composing of air gap magnetic fields and the analytic expression of levitating and advancing force. These results provide theoretic guidance not only for the analysis and measurement of the vehicle's air-gap magnetic fields but also for the eatablishment of the...