Numerical Evaluation of Thermal and Electromagnetic Stress in Frame-Reinforced Stacked REBCO Pancakes Coils

Keisuke Tokunaga, Seokbeom Kim, Ryota Inoue, Hiroshi Ueda

Research output: Contribution to journalArticlepeer-review

Abstract

To achieve high-field rare-earth barium copper oxide (REBCO) coils, the mechanism of the deterioration of or damage to such coils needs to be clarified. A REBCO coil experiences various stresses and strains during the winding, cooling down, charging, and discharging processes. Furthermore, the additional force and stress due to a screening current has become an issue in REBCO coils. To protect REBCO coils from large electromagnetic stress in a high field, a reinforcement structure called the Y-based oxide super-conductor and reinforcing outer integrated (YOROI) coil was proposed. This study numerically evaluated the effect of the YOROI coil structures against thermal and electromagnetic stress using a two-dimensional axisymmetric structural analysis. This simulation considered the following: 1) the mechanical stress induced by 10 N of winding tension, 2) thermal stress during cooling from 300 K to 10 K, and 3) electromagnetic stress, which included the additional stress due to a screening current during the charging process. The mechanical behavior due to each process was investigated, and the effect of the YOROI structures was also examined.

Original languageEnglish
JournalIEEE Transactions on Applied Superconductivity
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Coil deterioration and deformation
  • REBCO coil
  • reinforce structure
  • strain
  • stress
  • YOROI coil

ASJC Scopus subject areas

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

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