Patent ID: 7994684

Claim:
A rotor for an automotive generator, comprising: a pole core, including: a columnar boss portion; a pair of yoke portions that are disposed so as to extend radially outward from two axial end edge portions of said boss portion; and a plurality of claw-shaped magnetic pole portions that are disposed so as to extend axially from each of said pair of yoke portions, and that intermesh with each other, said pole core being fixed to a shaft that is inserted through a central axial position of said boss portion; and a field coil that is housed inside a field coil housing space that is surrounded by said boss portion, said pair of yoke portions, and said claw-shaped magnetic pole portions, wherein protruding portions are disposed so as to project from inner wall surfaces of portions of said yoke portions at root portions of each of said claw-shaped magnetic pole portions, and recess portions are recessed into inner wall surfaces of portions of said yoke portions that face said protruding portions, and a shape of a region in which said field coil is disposed is configured into a wave shape that shifts in an axial direction that has a cross-sectional shape in a plane that includes a central axis of said pole core that is approximately constant in a circumferential direction and that zigzags alternately in the axial direction at positions of each of said claw-shaped magnetic pole portions.