Patent ID: 6888283

Claim:
A motor having a substantially cylindrical stator disposed coaxially to a substantially cylindrical rotor having permanent magnets; the stator comprising: a stator core having teeth projecting towards the rotor, each tooth comprising a tooth body which is substantially parallel to a central axis of the stator and on which a coil is wound and a tooth tip having a substantially arc-shaped surface, the tooth tip facing the rotor through the substantially arc-shaped surface and not having a coil wound thereon; wherein the coil is accommodated in a slot between adjacent teeth and a magnetic field is produced by an alternating current flowing in the coil; wherein the stator core includes two types of steel plate laminated in an axial direction, the centers of the tooth tips of the two types of steel plate with respect to a circumferential direction are offset in the circumferential direction from the center with respect to the circumferential direction of the tooth body.