Design And Simulation Analysis Of Eddy Current Retarder For EMU

The eddy current retarder is a kind of contactless auxiliary braking equipment using eddy current braking working principle,with no noise,can reduce particle pollution and other advantages,can effectively reduce the load of the vehicle main brake,improve the safety of vehicle operation.In this paper,the CRH380 A locomotive is selected as the matching model,and the installation position of eddy current retarder is determined according to the structural characteristics of the trailer bogie.According to the relevant parameters of the rolling stock,the mechanical model analysis of the whole train is carried out to calculate the braking torque required for braking the train.Innovative design of a new type of double-winding eddy current retarder overall scheme,compared with the existing eddy current retarder braking efficiency and better heat dissipation.The equivalent magnetic circuit is drawn according to the basic law of magnetic circuit,and the equations of magnetoresistance and magnetic induction strength are obtained.Finally,the calculation formula of braking torque is derived from the theory of previous research.By using the electromagnetic field finite element analysis software,the variation curves of braking torque and maximum eddy current loss at different rotational speeds are obtained,and the relationship between magnetic induction strength and braking torque is verified by analyzing the variation of braking torque and magnetic induction strength in the transient magnetic field.The influence of relevant parameters on the magnetic field and braking torque is analyzed by the control variable method.The finite element analysis software is used to establish the thermal stress coupling field model and analyze the influence of temperature and thermal deformation on the braking performance of the equipment.According to the simulation analysis,the temperature change curve of the brake disc with time was obtained,and then the minimum selection value of air gap and the maximum selection value of brake disc thickness in the temperature field were analyzed according to the permissible temperature of the brake disc.Finally,the influence of air gap distance on thermal deformation is further analyzed through the thermal stress coupling field,and the air gap distance that meets the working requirements is obtained,thus verifying the safety and reliability of the equipment when working.