Magneto-electric-vibration coupling characteristics for superconducting EDS train using onboard closed-loop magnet and damping coil

With the increasing pursuit of higher speeds, research on superconducting electrodynamic suspension (EDS) has received much attention. The high speed poses great challenges to dynamic performance and ride comfort. Damping coils (DCs), which directly affect the vehicle-track interaction, are crucial for vibration control. This paper develops an electromagnetic analytical model considering DCs and closed-loop superconducting magnets (SCMs), verified by finite element method and test platform under diverse conditions. The magneto-electric-vibration coupling of a single suspension frame is analyzed with various control strategies. Dynamic characteristics and SCMs currents are illustrated for different control currents, and AC losses are simulated. Results show that the change in levitation force is the key reason for vibration suppression when control current is applied. A positive-negative switching strategy greatly improves vertical dynamics. However, excessive current worsens high-frequency vibrations and increases AC losses. Given the sensitivity of SCMs, limiting current to 80 A is reasonable.