Research On Traction System Engineering Application Problems Of Maglev Train

The low speed maglev train utilizes linear induction motor (LIM) as its traction system, thus the characteristics of the motors affect the performance of the traction; there are many differences between the low speed maglev train and the conventional wheel-rail train, so the"Traction Calculation Rules for Trains"does not support the calculation for the maglev train. Therefore, the work of calculating the characteristics of the LIM and developing a traction calculation software has a significant meaning. The main work is listed below:(1) For the disadvantages of the theoretical analysis method and the finite element method, in this thesis, the multi-layer theory is employed to establish the LIM model, and the model parameters are optimized using this model; the effectiveness and accuracy of theoretical calculation method are validated by a comparison of the calculation results and the experiments.(2) For the case of adding a layer with insulated materials into the composite materials of the secondary motor, the influences of the insulated layer on the secondary are analyzed, and the relationship among the thickness of insulated layer, the power factor, and the propulsive force is obtained. The influences on the performance of the LIM due to the lateral displacement between the primary and the secondary of the motor, which occurs when the vehicle is running, are discussed as well.(3) For the blank of traction calculation for the maglev train, a traction calculation model is established, which includes single particle maglev train model, motion equations, current and energy consumption calculations, and constraints. The characteristics of the traction strategies are analyzed. The flow charts of the algorithms using different traction strategies are presented, which solves the software implementation problems of the core algorithms.(4) A design scheme for the functions of the traction calculation software is presented, and the software interface and a database are designed. The traction of the low speed maglev vehicle in the Tangshan maglev test line is calculated using the calculation software developed in this dissertation; by comparison of the calculation result and the experimental result, the feasibility and the accuracy of the software are preliminarily validated. Finally, the west segment of the Beijing S1 route, which is to be constructed, is calculated using the software, and the result is of important significance for the optimization of the maglev routes.