Design, build and test of an AC coil using MgB2 wire for use in a superconducting machine

Xiaoze Pei, Alexander C. Smith, Xianwu Zeng, Mark Husband, Matthew Rindfleisch

Research output: Contribution to journalArticlepeer-review

5 Citations (SciVal)


Superconducting machines offer the significant advantage of smaller volume, lighter weight, and increased operating efficiencies compared with traditional electrical machines. To date, superconducting machines have utilized a superconducting dc field winding on the rotor of a synchronous machine. This increases the system complexity because it requires cryogenic cooling on the rotating part of the machine. The stator in these machines is generally composed of a set of conventional ac copper wire coils. Round magnesium diboride (\hbox{MgB}-{2}) wire however has the potential to form low-cost ac stator coils for a superconducting machine. This could enable a stationary superconducting ac stator winding to be fabricated, reducing the complexity associated with the cryogenic cooling. This paper presents initial test results on a prototype ac solenoidal coil to represent a typical ac stator coil for a superconducting machine using MgB2 wire. The diameter of the wire with insulation was 1 mm and the coil was wound in a double-layer solenoidal arrangement. The magnetic flux density distribution, quench current level, long duration operating current level, and the ac losses of the coil were measured and discussed. This paper demonstrates the potential of MgB2 wire to develop a superconducting ac stator winding for a superconducting machine.

Original languageEnglish
Article number6457417
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Early online date7 Feb 2013
Publication statusPublished - 30 Jun 2013


  • AC stator coil
  • cryogenics
  • MgB
  • superconducting machine


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