Studies of the Effect of Copper Layer on Dynamic Characteristics of a Stack-Type HTS Maglev System Based on H-Formulation

The study of dynamic characteristics is crucial for the future safe applications of HTS maglev systems. Currently, there is limited research on the dynamic characteristics of stack-type HTS maglev systems, particularly regarding the effect of the copper layer within the coated conductor multi-layer structure on vibrational behavior. This paper fills this research gap. The dynamic responses of a stack-type HTS maglev bearing under different time-varying external excitations are calculated with 3 modes (real-scale (HTS-copper) model, real-scale (HTS) model, homogenized model). It is found that under low-frequency external excitations, the induced currents in the copper layer are too small to significantly affect the vibrational response. However, under high-frequency external excitations, the primary effect of the induced currents in the copper layer is to induce phase delay of the dynamic response. Besides, the results from 3 models indicate that the accuracy of the homogenized model decreases as the external excitation frequency increases. In response to different operating conditions, the suitable modeling approaches are proposed from the perspectives of accuracy and computing time consumption.