| 摘要 |
An axial length of an iron core of a stator is set larger than an axial length of a cylindrical part on which a field coils are wound. An axial thickness of a yoke part is set larger than a radial thickness of a claw-like magnetic pole part. The cylindrical part is separate from the yoke part and fixed to the yoke part with the cylindrical part in contact with the yoke part. Thus, the contact surface of the cylindrical part and that of the yoke part serve as a thermal resistance, respectively, thereby preventing heat from being transmitted from the yoke part to the cylindrical part.
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