Investigation of HTS racetrack coil without turn-to-turn insulation for superconducting rotating machines

Young Gyun Kim, Seungyong Hahn, Kwang Lok Kim, Oh Jun Kwon, Haigun Lee

Research output: Contribution to journalArticle

85 Citations (Scopus)


This paper reports a study of two HTS racetrack coils wound with GdBCO coated conductors, one without turn-to-turn insulation and the other with Nomex insulation. The coils were characterized by charge-discharge, over-current, and sudden discharge tests. Thermal and electrical characteristics of the GdBCO racetrack coil without insulation outperformed the insulated one. The test results confirmed that although the coil without insulation has a slow charging/discharging time constant, the no-insulation winding technique may enable a compact and protection-free racetrack-typed coil with enhanced mechanical integrity as well as better thermal and electrical stabilities.

Original languageEnglish
Article number5200604
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2012 Jun 25



  • No-insulation
  • protection-free
  • racetrack coil
  • superconducting rotating machine

ASJC Scopus subject areas

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

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