Current distribution in YBCO coated conductors of toroidal coil composed of multiple double pancake coils

M. Tsuda, T. Hamajima

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We should prevent non-uniform current distribution due to manufacturing errors of tape size, coil size, and conductor deformation in the toroidal coil composed of multiple YBCO double pancake coils. This is because the non-uniform current distribution causes the increase of AC losses and the decrease of critical current in the YBCO tapes. Therefore, we analytically investigated the relationship between the manufacturing error and the current distribution in the toroidal coils composed of the eight seriesconnected double pancake coils composed of the transposed conductor with two parallel-connected YBCO tapes and the eight sets of two parallel-connected double pancake coils composed of single YBOC tape conductor connected in series. The parallel-connected multiple double pancake coils composed of single tape conductor is much more effective for preventing the non-uniform current distribution than the double pancake coil composed of the transposed conductor with parallel-connected multiple tapes. The non-uniformity of current distribution can be improved by increasing the length of parallel-connected current path by increasing the number of series-connected double pancake coils in each current path.

Original languageEnglish
Pages (from-to)999-1006
Number of pages8
JournalJournal of Superconductivity and Novel Magnetism
Volume24
Issue number1-2
DOIs
Publication statusPublished - 2011 Jan

Keywords

  • Current distribution
  • Pancake coil
  • Toroidal coil
  • Transposed conductor
  • YBCO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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