Patent ID: 7489060

Claim:
A machine comprising: a shaft adapted to rotate about a longitudinal axis of the shaft, the shaft comprising a magnetic material; a rotor assembly rotationally engaged with the shaft, the rotor assembly comprising a pair of rotor disks comprising a magnetic material, each of the rotor disks comprising a plurality of magnetic poles, the magnetic poles being spaced apart circumferentially, the rotor disks being coupled to the shaft for rotation about the shaft and generation of a rotating permeance wave; and a stator assembly comprising a plurality of armature windings disposed between the rotor disks and defining an air core stator, and a stationary superconducting field coil disposed between the air core stator and the shaft, 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.