| 摘要 |
The alternator comprises a stator including an iron core having teeth extending radially inwardly and arranged in a circumferential direction and a rotor including two sets of claw-like magnetic poles formed in a circumferential direction and fixedly mounted on a shaft in a state where the two sets of claw-like magnetic poles engage with each other. In each of the claw-like magnetic poles, an inclined surface is formed in each of both circumferential-direction side portions laying on an outer-diameter side of its proximal section. In this construction, when a circumferential-direction central position between the adjacent claw-like magnetic poles is aligned with a circumferential-direction central position of the tip portion of the tooth in the case of being viewed from a radial direction, the tip portion does not overlap with the outermost-diameter surface of each of the adjacent claw-like magnetic poles, but it overlaps with at least a portion of the inclined surface. A circumferential-direction distance &tgr; between the outermost-diameter surface and the tip portion is set to be 0<&tgr;<3delta where delta denotes an air gap defined therebetween.
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