Research on the electromagnetic characteristics of the high-speed magnetic levitation eddy current braking system
LYU Gang
WANG Yaohang
LIU Yaqing
CUI Leilei
ZHANG Zhixuan
HAN Tianyu
Abstract：In response to the insufficient research on the electromagnetic characteristics of the Eddy Current Braking System(ECBS)for high-speed maglev trains in engineering,an electromagnetic model is proposed.The relationship between braking force and parameters such as train operational speed,number of magnetic poles,excitation current,secondary plate thickness,number of turns in excitation coil,and structure of iron core cogging is established.First,the ECBS is divided into three solution regions based on the equivalent current layer method,and the magnetic field distribution ex-pressions for each region is calculated.Second,a model for the distribution of induced current density is developed,accounting for the skin effect's impact on the conductivity of the secondary plate mate-rial,and parameter corrections are made.The conductivity correction coefficient for the secondary plate material is then introduced,and the magnetic flux density expression at the interface between the secondary plate and the air gap is calculated using the boundary conditions in each solution region.Fi-nally,using the Maxwell stress tensor method,the braking force expression is derived,and a three-dimensional finite element simulation model is built based on the parameters of the ECBS for the mag-lev train.The results show that,in the analysis of braking force variations with respect to speed,exci-tation current,and secondary plate thickness,the average relative error between the analytical calcula-tions and finite element simulation results is within 10%,validating the mathematical model's effec-tiveness.The braking force first increases and then decreases with the increase of train speed,peaking at 50 km/h.It increases with the rise in excitation current,excitation coil turns,and other parameters.The braking force first increases and then stabilizes as magnetic pole pitch,secondary plate thickness,and other parameters increase.The braking force remains stable with increasing primary groove depth and decreases rapidly after surpassing the critical point.
Keywords：eddy current brakingequivalent current layer methodfinite element methodelectromag-netic performance
Publication Date：2024-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 162-169 )