Patent ID: 8258670

Claim:
A motor, comprising: a stator formed in a cylindrical shape by piling a plurality of annular shape disc plates in an axial direction of the motor, the stator including a yoke portion accommodating a rotor therein and having a plurality of first portions and a plurality of second portions, the second portions having a radial length longer than a radial length of the first portions, and the first portions and the second portions being alternately formed in a circumferential direction of the stator, and a plurality of tooth portions respectively formed at the second portions of the yoke portion and radially protruding from an inner circumferential surface of the yoke portion at the second portion of the yoke portion towards an axial center of the stator; a case provided at an outer circumference of the stator for supporting the stator and including a first communicating passage extending in an axial direction of the stator and defined by an inner circumferential surface of the case, the first communicating passage in communication with both axial ends of the stator; and a supporting portion protruding from an inner circumferential surface of the first communicating passage towards the stator and contacting an outer surface of the disc plates of the stator at one of the first portions of the stator; each of the disc plates being formed from a single circular piece; an outer shape of each of the disc plates being circularity; and all of the plurality of first portions contact the supporting portion or an inner surface of the case.