Demonstration of a Practical Nb 3 Sn Coil for an Actively Shielded Generator

David Loder, Matthew Feddersen, Reed Sanchez, Kiruba Haran, Mike Sumption, Chris Kovacs, Milan Majoros, E. W. Collings, David Doll, Xuan Peng, Jinji Yue

Research output: Contribution to journalArticlepeer-review


This paper describes a detailed design of a 6-T Nb3 Sn superconducting racetrack coil designed for conduction cooling. We then describe a bench test pursued as a proof of concept for one winding of an actively shielded air-core electric machine with superconducting field windings. Electromagnetic design selection is drawn from previous optimization work. The coil former design is then discussed. Numerical simulations of thermal and structural features are pursued to determine temperature distribution and strain within the winding. A coil instrumentation and experimental setup of a quasi-conduction cooled system is described. Finally, test results are presented; a maximum critical current of 480 A was reached at a peak temperature of 7.9 K, surpassing the operational current goal of 435 A. Future work and planned improvements to the test setup are discussed.

Original languageEnglish (US)
Article number7815394
JournalIEEE Transactions on Applied Superconductivity
Issue number4
StatePublished - Jun 2017


  • AC machines
  • magnetic shielding
  • rotating machines
  • superconducting coils
  • superconducting magnets

ASJC Scopus subject areas

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


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