An on-board 2G HTS magnets system with cooling-power-free and persistent-current operation for ultrahigh speed superconducting maglevs

Abstract

Introduction of superconductor to magnetic levitation (maglev) trains greatly enhances the performances compared to those of normal conductor maglevs, e.g. from 430 km/h of the Transrapid (in Shanghai) to 603 km/h of the L0 Series in Japan. However, one of the important constraints on development of superconducting maglevs is limited wireless feeding power for on-board superconducting magnets and cryogenic cooling. In this paper, a persistent-current superconducting magnets system with solid nitrogen (SN 2 ) cooling preservation is proposed for liberation of its demanding on-board power feeding requirement. The magnets are optimally designed with no-insulation technique guaranteeing a safe operation with magnetic field over 0.8 T. Lasting time of persistent current (at 96.5% magnetic field retained) and SN 2 cooling preservation (up to 40 K) is all >9 h, covering a maglev traveling distance of >5400 km at average designed speed of >600 km/h. The magnets have anti-vibration ability of 15 g (147 m/s 2 ) up to 350 Hz, which has covered the vibratory motion range in maglevs. This work is intended to provide a reference for superconducting maglev developments.

<b>Research and Development of Maglev and Application of Related Technologies to Conventional Railways</b>

“…They aim to develop a magnet operable for a certain period without a refrigerator using solid nitrogen (SN2), which has a high specific heat, as a heat capacity medium. This may be based on RTRI's previous development examples [13]. China also has a development plan for a maglev aiming for a maximum speed of 4,000 km/h by China Aerospace Science and Industry Corporation (CASIC).…”

Perovskite Puzzle for Revolutionary Functional Materials

“…Vice versa, HLH materials can effectively generate light by converting electrical energy in light-emitting devices and quantum dots under low voltages and low currents (De Roo et al, 2016 ; Fu et al, 2019 ). HTSCs are the only type of materials in this group requiring high current applications demanded for industrial transport of electricity, industrial current limiters or generation of record magnetic fields in energy generation or transport systems (Bednorz, 2019 ; Dong et al, 2019 ).…”

Design, Fabrication and Test of a High- Temperature Superconducting Linear Synchronous Motor Mover Magnet Prototype for High-Speed Maglev

“…However, only static tests were carried out, and there are no dynamic performance data reported. Zheng Huang et al proposed a design method for an on-board persistent-current superconducting magnet system with cooling-free operation, especially for superconducting maglevs [20], [21]. The structural dynamics of the HTS magnets were evaluated by simulation considering electromagnetic and thermal stress [22].…”