Influence of Copper Rings and Plates on Eddy Losses of No-Insulation High Temperature Superconductor Coil in Synchronous Machines

Yutong Fu, Yawei Wang, Qingqing Yang, Wenbo Xue, Zhen Lu, Zhiyong Hong, Zhijian Jin

Research output: Contribution to journalArticlepeer-review

Abstract

No-insulation (NI) high temperature superconducting (HTS) machine is a semi-superconducting machine with improved thermal-stability and power density, in which the rotor windings are replaced with NI HTS coils. However, the AC background field from stator windings leads to significant eddy current in NI HTS windings. The induced eddy current and loss affect the operating efficiency and safety of HTS machine. Traditionally, copper discs and rings are used for conduction cooling and mechanical support of NI HTS coil. In this paper, the influence of copper discs and rings on reducing the eddy current and loss of double pancake NI HTS coil is studied. Three structures of copper discs, copper ring, and both copper discs and ring are analyzed, by both simulation and experiment. The results show that all these three structures of copper shielding can effectively reduce the eddy loss on NI HTS coil within the HTS machine operating temperature of 20-30 K. The combination of copper discs and ring has the best shielding performance.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalIEEE Transactions on Applied Superconductivity
Volume32
Issue number6
Early online date21 Apr 2022
DOIs
Publication statusE-pub ahead of print - 21 Apr 2022

Bibliographical note

Publisher Copyright:
IEEE

Keywords

  • Copper
  • eddy current and loss
  • Eddy currents
  • electromagnetic shielding
  • High-temperature superconductors
  • Magnetic field measurement
  • Magnetic fields
  • no-insulation coil
  • ripple magnetic field
  • Superconducting machine
  • Superconducting magnets
  • Windings

ASJC Scopus subject areas

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

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