Design and Analysis of Cooling Structure on Advanced Air-Core Stator for Megawatt-Class HTS Synchronous Motor

Ji Hyung Kim, Chang Ju Hyeon, Sang Heon Chae, Do Jin Kim, Chang Jin Boo, Young Sik Jo, Yong Soo Yoon, Seong Gyeom Kim, Haigun Lee, Ho Min Kim

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


A general high-temperature superconducting synchronous motor (HTSSM) is designed and manufactured with an air-core structure, which eliminates the laminated iron core to concentrate the linkage flux in conventional rotor and stator. In an air-core structure, a nonmagnetic material such as glass fiber-reinforced plastic (GFRP) is used as an armature winding supports to avoid saturation of magnetic field density in the stator core and to reduce the weight and harmonics of the motor. However, GFRP air-core supporters make heat dissipation difficult due to the very low thermal conductivity of GFRP, which makes sustainable and stable operation of HTSSMs impossible. Therefore, in this paper, the concept of advanced air-core stator (AACS) is presented to enhance the cooling performance of a conventional GFRP air-core stator. The AACS concept pertains to the introduction of thermal conductive materials on an armature supporter to replace the GFRP material of a conventional air-core stator. The AACS concept structure for a 1.5-MW-class HTSSM was designed and analyzed using three-dimensional electromagnetic and thermal finite element method.

Original languageEnglish
Article number7855727
JournalIEEE Transactions on Applied Superconductivity
Issue number4
Publication statusPublished - 2017 Jun

Bibliographical note

Funding Information:
This work was supported in part by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning, Grant funded by the Ministry of Trade, Industry and Energy, and in part by the National Research Foundation of Korea, Grant funded by the Korea Government (MSIP), Republic of Korea (20164030201230 and 2016R1A2B4007324).

Publisher Copyright:
© 2002-2011 IEEE.


  • Advanced air-core stator
  • Eddy-current loss
  • Finite element method
  • High thermal conductivity
  • Laminated armature supporter

ASJC Scopus subject areas

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


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