Development of the Current Bypassing Methods into the Transverse Direction in Non-insulation HTS Coils

K. Tanaka, S. B. Kim, H. Ikoma, D. Kanemoto

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

In the case of motors and generators, the benefits of using high temperature superconducting (HTS) coils can be represented by the reduction of 50% in both losses and sizes compared to conventional machines. However, it is hard to establish quench detection and protection devices for the HTS coils applied to the rotors of motors and generators. So, the stability of the coils is lower than for the quiescent coils applied to NMR, MRI and so on. Therefore, it is important to improve the self-protection ability of HTS coils. We have studied the methods to improve the self-protection ability of HTS coils by removing the layer-to-layer insulation and inserting metal tape instead of the electrical insulation. The operating current in the non-insulated HTS coil was bypassed into the transverse direction by the generated normal region because of their electrical contact among the winding. In this study, we examined the method to control the current bypassing on layer-to-layer for controlling the inductance of the non-insulated HTS coil. The current bypassing properties on non-insulated HTS coil wound with 2G wires will be discussed.

Original languageEnglish
Pages (from-to)229-232
Number of pages4
JournalPhysics Procedia
Volume65
DOIs
Publication statusPublished - Jan 1 2015
Event27th International Symposium on Superconductivity, ISS 2014 - Tokyo, Japan
Duration: Nov 25 2014Nov 27 2014

Keywords

  • control bypassing current
  • current sharing
  • HTS coil
  • MQE
  • Non-insulation
  • thermal properties of 2G wire

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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