Numerical Evaluation of the Reinforcing Effect of the Advanced YOROI Coil Structure for the HTS Coil

Yuji Kashiwazaki, Atsushi Ishiyama, Xudong Wang, Hiroshi Ueda, Tomonori Watanabe, Shigeo Nagaya

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    REBCO coils applied to superconducting magnetic energy storage system, magnetic resonance imaging, medical accelerator, and so on, are expected to result in high efficiency and compactness due to the realization of higher magnetic field and current density. Because these devices require large coil radius, huge hoop stress 'BJR' (= magnetic field × current density × coil radius) is produced in the coil winding and the damage to these devices is likely to cause. In our previous study, we proposed a novel coil structure called the Y-based oxide superconductor and reinforcing outer integrated (YOROI) structure to achieve a high-strength REBCO pancake coil. The YOROI structure comprises upper and lower plates and the outer frame of the winding outer periphery. The frames are forcibly expanded by the superconducting coil winding situated inside when the coil winding is subjected to an electromagnetic force. The outer frame is connected to the upper and lower plates and transfers a part of the electromagnetic force from the coil winding to the reinforcing outer plates. The reinforcing outer plates then support the coil to suppress the coil deformation against the electromagnetic forces. The YOROI structure achieved the resistance to a maximum hoop stress of 2 GPa, which was calculated from the BJR in an excitation test at 4.2 K in 8-T backup fields. In this study, we investigated the effect of the stress control structure to realize the HTS coil with a mechanical strength of over 2 GPa using a three-dimensional finite-element structural analysis.

    Original languageEnglish
    Article number7817852
    JournalIEEE Transactions on Applied Superconductivity
    Volume27
    Issue number4
    DOIs
    Publication statusPublished - 2017 Jun 1

    Fingerprint

    coils
    evaluation
    Current density
    Magnetic fields
    Oxide superconductors
    Medical imaging
    hoops
    Magnetic resonance
    Structural analysis
    Energy storage
    Strength of materials
    Particle accelerators
    electromagnetism
    current density
    magnetic energy storage
    radii
    backups
    void ratio
    high strength
    structural analysis

    Keywords

    • Electromagnetic force
    • hoop stress
    • REBCO-coated conductor
    • reinforcing structure

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

    Cite this

    Numerical Evaluation of the Reinforcing Effect of the Advanced YOROI Coil Structure for the HTS Coil. / Kashiwazaki, Yuji; Ishiyama, Atsushi; Wang, Xudong; Ueda, Hiroshi; Watanabe, Tomonori; Nagaya, Shigeo.

    In: IEEE Transactions on Applied Superconductivity, Vol. 27, No. 4, 7817852, 01.06.2017.

    Research output: Contribution to journalArticle

    Kashiwazaki, Yuji ; Ishiyama, Atsushi ; Wang, Xudong ; Ueda, Hiroshi ; Watanabe, Tomonori ; Nagaya, Shigeo. / Numerical Evaluation of the Reinforcing Effect of the Advanced YOROI Coil Structure for the HTS Coil. In: IEEE Transactions on Applied Superconductivity. 2017 ; Vol. 27, No. 4.
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