Influence of eddy current braking of high-speed train on track axle counter

Linear eddy current braking has the potential to become a new type of braking method for high-speed EMUs due to its non-adhesive braking characteristics. At present, there is a lack of relevant research on the electromagnetic interference of the eddy current braking system on the existing track signal equipment, which hinders the further application of this technology. In this paper, the axle counter was selected as a typical track signal device. On the basis of theoretical analysis, ANSYS Maxwell and Twin Builder were used to establish simulation models of eddy current brake electromagnetic system and axle counter respectively. Then, based on the Twin Builder platform, the eddy current brake system model and the axle counter model were jointly simulated to analyze the electromagnetic interference of the eddy current brake system to the axle counter. The experimental result shows that the simulation results of the eddy current brake electromagnetic system model are consistent with the theoretical calculation results. The inductance voltage of the axle counter is 8.94 mV when the train without the eddy current brake system passes, which verifies the correctness of the established model. The axle counter induction coil will generate an interference voltage with a peak value of about 50 mV when the train with an eddy current brake system passes. The interference may make the inductive voltage of the axle counter exceed the set threshold and cause misjudgment, resulting in the occupation situation of the track section is inaccurate, which affects driving safety. The co-simulation model can assist in the design of eddy current brake devices, thereby promoting its application.