A Linear Eddy Current Braking System With Normal Force Suppression Function for Electrodynamic Suspension Train

The linear eddy current braking (LECB) system is suitable for use as an emergency braking system to ensure the safe and stable operation of high-speed maglev trains. This article analyzes the adverse effects of the normal force generated by eddy currents on the stable levitation of the electrodynamic suspension (EDS) train. From the perspective of electromagnetic mechanisms, it elucidates the intrinsic relationship between the magnetic field distribution and the resulting eddy current electromagnetic forces. Based on this theoretical framework, a novel parallel hybrid excitation (PHE) eddy current braking electromagnetic structure is proposed for the EDS train. The aim is to suppress the normal force without reducing the braking force. Using the subdomain method and the principle of equivalent magnetic vector potential, a spatiotemporal distribution model of magnetic flux density, along with analytical models for the eddy current braking force and normal force, is developed. Key parameters influencing the system's electromagnetic performance are identified. The analytical model's accuracy is validated through 3-D finite element simulations, confirming the effectiveness of the proposed structure and providing a theoretical basis for its application in EDS trains.