Efficient Magnetic Shielding Analysis for the Superconducting Magnet Outer Dewar in EDS Systems

In electrodynamic suspension (EDS) maglev systems, the time-varying magnetic fields experienced by onboard superconducting magnets can induce excessive AC losses and elevate the risk of quench, posing a critical threat to operational reliability. Conventional three-dimensional finite element analysis, though accurate, requires hours per frequency point and cannot support real-time quench assessment or parametric design optimization. This paper proposes an efficient magnetic shielding analysis method based on a reflection–absorption decoupled lumped-parameter framework. The three-dimensional eddy current field is reduced to a low-order coupled system by decomposing the eddy currents into plate-surface modes, a global circulation loop, and side-wall contributions, all coupled through a unified series magnetic circuit, while the field penetration through the cavity wall is captured via a finite impulse response (FIR) diffusion kernel with a high-frequency correction. The proposed method achieves a simulation time of 3–5 s per frequency point, a speedup of approximately 103∼104 over finite element analysis, with a root-mean-square shielding effectiveness deviation of 2.03 dB over 10 Hz–3000 Hz. The efficiency of the proposed method enables co-optimization of the outer dewar and superconducting magnets, offering a practical analysis tool for quench mitigation and electromagnetic compatibility design in EDS maglev systems.