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<p>The low temperature superconducting (SC) coil is considered as an easy-implement candidate for onboard superconducting magnet of the electro-dynamic suspension (EDS) due to its mature fabrication process, low material cost, reversible quench, ductile mechanical properties and long-manufactured commercial strand. The complicated electromagnetic and mechanical vibration poses many difficulties for the design and manufacture of the SC coil, particularly, under the circumstance of extra-high speed. In this work, we firstly design the SC coil considering the vibration suppression and stiffness enhancement, and magnetic field, Lorentz force and modal frequencies are analyzed. Afterwards according to the thoughtful design, we manufacture the SC coil including persistence current switch (PCS), protect diode, reinforcement structures and insulation spacers. We then introduce the cost-saving experimental system to evaluate the electromagnetic and mechanical properties of the SC coil based on coolant-soaking method. Finally, we focus lots of efforts in the SC coil measurements and results discussions. The voltage, current and magnetic field behaviors in different operating modes of current charging, current closed-loop, current discharging and quench are measured. The strains of the SC coil during cooling and current charging process are measured, and the simulated results are compared. It is shown that the SC coil can be repeatedly charged the current of 325&#xa0;A while the operation current is 250&#xa0;A, which proves the SC coil have sufficient safe margin in critical current. The current decay rate of 0.114%/day indicates the feasibility of the long-time operation of the EDS system. The maximum strain during cooling process is up to ~ 1500&#xa0;μm/m which is similar to simulated results. The acceptable strain can further confirm that the designed reinforcement structures are effective. The results of this study may provide useful information for the design, manufacture and test of the SC coil for onboard SC magnet in extra-high-speed EDS system.</p>

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Design, Manufacture and Test of the Low Temperature Superconducting Coil for Extra-High Speed Electro-Dynamic Suspension System

  • 期刊论文

  • 发表日期：

    2026年5月2日

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  • Wei Zhou,
  • Kun Liu,
  • Ruizhe Zhang,
  • Jinpeng Yu,
  • Zian Zhu,
  • Xuehua Zhang,
  • Zhihua Zhang

摘要

The low temperature superconducting (SC) coil is considered as an easy-implement candidate for onboard superconducting magnet of the electro-dynamic suspension (EDS) due to its mature fabrication process, low material cost, reversible quench, ductile mechanical properties and long-manufactured commercial strand. The complicated electromagnetic and mechanical vibration poses many difficulties for the design and manufacture of the SC coil, particularly, under the circumstance of extra-high speed. In this work, we firstly design the SC coil considering the vibration suppression and stiffness enhancement, and magnetic field, Lorentz force and modal frequencies are analyzed. Afterwards according to the thoughtful design, we manufacture the SC coil including persistence current switch (PCS), protect diode, reinforcement structures and insulation spacers. We then introduce the cost-saving experimental system to evaluate the electromagnetic and mechanical properties of the SC coil based on coolant-soaking method. Finally, we focus lots of efforts in the SC coil measurements and results discussions. The voltage, current and magnetic field behaviors in different operating modes of current charging, current closed-loop, current discharging and quench are measured. The strains of the SC coil during cooling and current charging process are measured, and the simulated results are compared. It is shown that the SC coil can be repeatedly charged the current of 325 A while the operation current is 250 A, which proves the SC coil have sufficient safe margin in critical current. The current decay rate of 0.114%/day indicates the feasibility of the long-time operation of the EDS system. The maximum strain during cooling process is up to ~ 1500 μm/m which is similar to simulated results. The acceptable strain can further confirm that the designed reinforcement structures are effective. The results of this study may provide useful information for the design, manufacture and test of the SC coil for onboard SC magnet in extra-high-speed EDS system.