Abstract
The null-flux electro-dynamic suspension (EDS) system is a feasible high-speed maglev system with speeds of above 600 km/h. Owing to their greater current-carrying capacity, superconducting magnets can provide a super-magnetomotive force that is required for the null-flux EDS system, which cannot be provided by electromagnets and permanent magnets. Relatively mature high-speed maglev technology currently exists using low-temperature superconducting (LTS) magnets as the core, which works in the liquid helium temperature region (T ⩽ 4.2 K). Second-generation (2G) high-temperature superconducting (HTS) magnets wound by REBa2Cu3O7−δ (REBCO, RE = rare earth) tapes work above the 20 K region and do not rely on liquid helium, which is rare on Earth. In this study, the HTS non-insulation closed-loop coils module was designed for an EDS system and excited with a persistent current switch (PCS). The HTS coils module can work in the persistent current mode and exhibit premier thermal quenching self-protection. In addition, a full-size double-pancake (DP) module was designed and manufactured in this study, and it was tested in a liquid nitrogen (LN2) environment. The critical current of the DP module was approximately 54 A, and it could work in the persistent current mode with an average decay rate measured over 12 h of 0.58%/day.
Highlights
electromagnetic suspension (EMS) uses the electromagnetic attraction between the on-board magnets and ground rails to create suspension, where the suspension height remains at 8 to 10 mm and a highly accurate control system is required
This study presents the fabrication of a prototype high-temperature superconducting (HTS) magnet that can be applied to an electro-dynamic suspension (EDS) system and loaded onto a maglev trial vehicle with the schematic structure shown in Figure ??
Because tape A and B are similar in terms of production process element composition of REBCO layer, their Ic − B − θ characteristics are supposed to be with a similar proportional relationship
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. EMS uses the electromagnetic attraction between the on-board magnets and ground rails to create suspension, where the suspension height remains at 8 to 10 mm and a highly accurate control system is required. As it is generated from the on-board HTS bulks and permanent-magnet ground rails, HTS flux-pinning suspension does not require a control system, but the cost of the ground rails is very uneconomic. The DP module can operate in the persistent current mode, and the average decay rate was 0.58%/day for 12 h, which meet the design requirements of such a system and provides a foundation for the fabrication of the prototype HTS magnets
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