Development of Stator Windings for Fully Superconducting Motor With Wires
Applied Superconductivity, IEEE Transactions（2013）
Abstract
Stator windings for a superconducting motor with MgB2 wires are fabricated and tested. The stator windings are composed of 12 element coils in the form of a racetrack, and located in iron core slots to generate a rotating magnetic field of three phases and four poles. Preliminary estimations by means of numerical calculations with a finite element method indicate that the magnetic-flux distribution in a gap between the stator and rotor cores contains relatively significant components of fifth and seventh harmonics compared with a fundamental component. An MgB2 rotor prepared in the previous work can be rotated at a synchronous speed successfully by energizing the fabricated stator windings with a pulse width modulation inverter and compensating for the higher harmonics with a torque boost voltage.
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Key words
electric motors,finite element analysis,magnesium compounds,magnetic flux,rotors,stators,superconducting coils,superconducting machines,synchronous motors,wires (electric),mgb2,element coils,fifth harmonics component,finite element method,fully superconducting motor,iron core slots,magnetic-flux distribution,numerical calculations,pulse width modulation inverter,racetrack form,rotating magnetic field,rotor core,seventh harmonics component,stator core,stator winding development,synchronous speed,torque boost voltage,wires,inverter drive,magnesium diboride,racetrack coil,superconducting stator,windings
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