Bench experiments play a crucial role in studying the eddy-current braking characteristics.The longitudinal end effect significantly influences experimental results,when the number of magnetic poles used in these experiments is below the design level.Therefore,studying the generating mechanism of this effect and correction methods become imperative.This study introduced experi-mental schemes with varying magnetic pole counts to verify the influence of the end effect on braking force and dynamic attractive force.The study employed 2-D finite element electromagnetic simulations to extract the distribution patterns of the magnetic field,eddy current density,and Lorentz force,elucidating the generating mechanism of the end effect.By calculating the braking force of individual magnetic pole at different speeds,the study inferred the contribution of the end magnetic pole to the braking force,deriving the correction formula-tion of end effect.The study results show that a minor influence of the end effect on the dynamic attractive force,while a significant im-pact on the braking force,necessitating correction solely for the braking force.The braking force of the leading pole is identified nearly equal to that of the intermediate pole,while that of the trailing pole is lower and its contribution is approximately linearly related to speed.By correcting the braking force experimental data using a trailing pole contribution function,a notable reduction in the relative er-ror between the correction results and the braking force derived from 3-D finite element simulations is observed.The research findings serve as a reference for the design of eddy-current braking experiments and the processing of experimental data.This enhancement con-tributes to a better comprehending of accurate eddy-current braking characteristics,thereby offering guidance in product research and de-velopment.
关键词
涡流制动/永磁涡流制动/端部效应/电磁制动/电磁仿真/高速列车
Key words
eddy-current braking/permanent magnetic eddy-current braking/end effect/electromagnetic braking/electromagnetic simulation/high-speed train
维普
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