Patent ID: 7541711

Claim:
A stator of an electric motor, comprising: a plurality of teeth each having a tooth main body and a tooth reinforcing portion, the tooth main body being formed of a powder magnetic core material, and the tooth reinforcing portion being integrally molded with at least a part of a surface of the tooth main body and being formed of metal having a higher mechanical strength than that of the tooth main body, and surrounding a proximal portion in rectangular shape; coils each being wound about one of the teeth; and a yoke having fitting openings each receiving one of the teeth, wherein the yoke includes a yoke main body made of a powder magnetic core material and yoke reinforcing portions each provided on at least a part of a wall surface defining one of the fitting openings, the yoke reinforcing portion being molded integrally with the yoke main body and being formed of metal having a higher mechanical strength than that of the yoke main body, and wherein each tooth is fitted to the corresponding fitting opening in such a manner that the tooth reinforcing portion contacts the corresponding yoke reinforcing portion.