Patent ID: 6876115

Claim:
A magnet field type rotary electric apparatus comprised of a rotor and a cooperating stator rotatable relative to each other about an axis, one of said rotor and said stator being comprised of a plurality of circumferentially spaced permanent magnets and the other of said rotor and said stator having a plurality of circumferentially spaced pole teeth surrounded by coil windings, at least one of said plurality of circumferentially spaced permanent magnets and said plurality of circumferentially spaced pole teeth surrounded by coil windings being divided in an axial direction into plurality of stages (n) each of which is circumferentially displaced around said axis at angular intervals of Θ degrees relative to each other, said displacement angle of Θ is expressed as Θ=360°/(A×n), where A is the least common multiple of the number of pole teeth and the number of magnets.