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

Xiaoze Pei, Sandy Smith, Xianwu Zeng, M.b Husband, M.c Rindfleisch

    Research output: Contribution to journalArticlepeer-review


    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 (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. © 2011 IEEE.
    Original languageEnglish
    Article number5202605
    Pages (from-to)5202605-5202605
    Number of pages1
    JournalApplied Superconductivity, IEEE Transactions on
    Issue number3
    Publication statusPublished - 7 Feb 2013


    • cooling
    • cryogenics
    • magnesium compounds
    • magneticflux
    • rotors
    • solenoids
    • superconducting machines
    • wires (electric)
    • ACcoil
    • MgB_2
    • cryogenic cooling
    • double-layer solenoidalarrangement
    • electrical machines
    • magnetic flux densitydistribution
    • quench current level
    • rotor
    • superconductingmachine
    • synchronous machine
    • wire
    • Loss measurement
    • Statorwindings
    • Superconducting coils
    • Superconducting filaments andwires
    • Wires
    • $hboxMgB_2$
    • AC stator coil


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