Patent ID: 7868504

Claim:
A resolver comprising: a resolver stator including a plurality of coil windings, the resolver stator being approximately annular about a center axis; and a resolver rotor rotatable about the center axis relative to the resolver stator and including a first surface and a second surface on opposing radial sides thereof, the first surface being opposed to the resolver stator with a gap therebetween in the radial direction; wherein the resolver stator includes a plurality of axially stacked plates and the resolver rotor includes a plurality of axially stacked rotor pieces; at least one of the plurality of axially stacked rotor pieces of the resolver rotor arranged at an axial end of the resolver rotor includes deformed portions which jointly fit into an adjacently positioned one of the plurality of axially stacked rotor pieces such that the rotor pieces are aligned together, and the deformed portions are arranged between an approximate center of a radial thickness of the resolver rotor and the second surface; and the second surface of the resolver rotor includes concave portions at circumferential positions corresponding to the deformed portions.