Patent ID: 7492073

Claim:
A machine comprising: a stator assembly comprising a stator yoke, a pair of armature coils mechanically coupled to the stator yoke, and a stationary superconducting field coil, wherein the stator yoke comprises a magnetic material; a shaft rotatably mounted in the stator yoke, the shaft comprising a non-magnetic material; and a rotor assembly rotationally engaged with the shaft, the rotor assembly comprising a rotor disk extending between the armature coils, the rotor disk comprising an inner portion and an outer portion, wherein the outer portion of the rotor disk comprises a plurality of circumferentially-spaced, magnetic poles, the rotor disk being coupled to the shaft for rotation about the shaft and generation of a rotating permeance wave, wherein the stationary superconducting field coil is disposed between the stator yoke and the rotor disk, wherein the stationary superconducting field coil is configured as a stationary magneto-motive force (MMF) source for the rotating permeance wave produced by the rotor assembly to produce a rotating magnetic field, wherein the stator assembly further comprises a pair of stator cores mechanically coupled to the stator yoke, wherein each of the stator coils is mounted on a respective one of the stator cores, wherein the shaft is rotatably mounted in the stator yoke on a plurality of bearings, wherein the stator cores comprise a magnetic material, and wherein the stator cores comprise circumferential laminations.