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

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

Energy, 2020, vol. 190, issue C

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.

Keywords: Energy preservation; Energy conversion; Persistent current; Superconducting magnet; Cryogenics; Maglev (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:190:y:2020:i:c:s0360544219320985

DOI: 10.1016/j.energy.2019.116403

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