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Improvement of magnetic and cryogenic energy preservation performances in a feeding-power-free superconducting magnet system for maglevs

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  • Dong, Fangliang
  • Huang, Zhen
  • Xu, Xiaoyong
  • Hao, Luning
  • Shao, Nan
  • Jin, Zhijian

Abstract

This work relates to improvement of magnetic and cryogenic energy preservation performances in an on-board high-temperature superconducting magnet system used in linear synchronous motors for ultrahigh speed maglevs. Since maglevs remove all the physical contacts to the ground, the wireless on-board feeding power is rather limited especially for superconducting subassemblies. And it has become one of the development bottlenecks. For the magnet system, realization of on-board feeding-power free is pivotal, which is regarding to two important energy conversions: electrical to magnetic energy by persistent-current mode of superconductivity, and latent heat to effective cooling (or cryogenic) energy by α-β phase transition of solid nitrogen (SN2) in the system. Improvements of the two energy conversions are the main work. Firstly, model and numerical approach of persistent-current mode are proposed, followed by simulation of SN2 cooling. Then performances of persistent-current mode and cryogenic energy preservation are reported. Energy conversion efficiency is also analyzed for a strategy to improve cooling performance. The strategy successfully extends cryogenic energy preservation time to 8.83 h and suppresses thermal non-uniformity to <0.1 K. The enhanced cooling performance is also reflected in a prolonged persistent-current mode lasting for 8.17 h. The work demonstrates the applicability of the magnet system.

Suggested Citation

  • Dong, Fangliang & Huang, Zhen & Xu, Xiaoyong & Hao, Luning & Shao, Nan & Jin, Zhijian, 2020. "Improvement of magnetic and cryogenic energy preservation performances in a feeding-power-free superconducting magnet system for maglevs," Energy, Elsevier, vol. 190(C).
    • Handle: RePEc:eee:energy:v:190:y:2020:i:c:s0360544219320985
    DOI: 10.1016/j.energy.2019.116403
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    References listed on IDEAS

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    1. David Larbalestier & Alex Gurevich & D. Matthew Feldmann & Anatoly Polyanskii, 2001. "High-Tc superconducting materials for electric power applications," Nature, Nature, vol. 414(6861), pages 368-377, November.
    2. Seungyong Hahn & Kwanglok Kim & Kwangmin Kim & Xinbo Hu & Thomas Painter & Iain Dixon & Seokho Kim & Kabindra R. Bhattarai & So Noguchi & Jan Jaroszynski & David C. Larbalestier, 2019. "45.5-tesla direct-current magnetic field generated with a high-temperature superconducting magnet," Nature, Nature, vol. 570(7762), pages 496-499, June.
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    Cited by:

    1. Li, Chao & Li, Gengyao & Xin, Ying & Li, Bin, 2022. "Mechanism of a novel mechanically operated contactless HTS energy converter," Energy, Elsevier, vol. 241(C).
    2. Zhu, Lingfeng & Wang, Yinshun & Guo, Yuetong & Liu, Wei & Hu, Chengyang, 2023. "Current decay and compensation of a closed-loop HTS magnet in non-uniform magnetic fields based on electro-magneto-thermal semi-analytical analysis," Energy, Elsevier, vol. 277(C).

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