Dynamic Characteristics and Protection Strategy for Superconducting Electrodynamic Suspension Train With Quenched Magnet

Abstract

Superconducting magnet (SCM), as one of the key components of superconducting electrodynamic suspension (EDS) train, plays a critical role in load capacity and service safety. Quench behavior of SCM not only reduces the ride comfort but also increases the risk of accidents for the train, especially at high speeds where it becomes more dangerous and uncontrollable. Therefore, to evaluate the influence of quench conditions, this article proposes a dynamic model that considers the protective effect of auxiliary wheels when quench behavior occurs on the SCM. By controlling the variable resistance of SCM in the improved electromagnetic model, a switch can be realized among the normal and quench conditions. Furthermore, regarding the EDS train with propulsion, levitation, and guidance (PLG) coils as an object, the dynamic characteristics and magnetoelectric force coupling mechanism are analyzed and revealed under different quench positions. Finally, based on the analysis above, an emergency protection strategy is put forward by releasing energy from SCM on the opposite side of quench magnet. The results show that the strategy is able to avoid a sharp increase in guidance force and makes the re-stabilization possible in lateral dynamics, providing a valuable solution for coping with the quench condition of EDS train.