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

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...

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Bibliographic Details
Published in:Energy (Oxford) 2020-01, Vol.190, p.116403, Article 116403
Main Authors: Dong, Fangliang, Huang, Zhen, Xu, Xiaoyong, Hao, Luning, Shao, Nan, Jin, Zhijian
Format: Article
Language:English
Subjects:
Beta phase
Computer simulation
Cooling
Cooling effects
Cryogenic cooling
Cryogenic effects
Cryogenics
Electric contacts
Energy
Energy conversion
Energy conversion efficiency
Energy preservation
High temperature
Latent heat
Maglev
Nonuniformity
Persistent current
Phase transitions
Preservation
Solid nitrogen
Superconducting magnet
Superconductivity
Synchronous motors
Ultrahigh temperature
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Summary: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
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2019.116403