Patent ID: 7795777

Claim:
A dynamoelectric rotor comprising: first and second pole cores on which are formed integrally: a boss portion through which a shaft insertion aperture is disposed at a position of a central axis; n core flange portions that are disposed so as to extend radially outward at a uniform angular pitch circumferentially on an outer circumferential edge portion at a first end of said boss portion, where n is an integer; and n claw-shaped magnetic pole portions that are disposed so as to extend and taper toward a second axial end from each of said core flange portions, said first and second pole cores being disposed such that said claw-shaped magnetic pole portions face each other so as to intermesh and leading end surfaces of said boss portions are abutted with each other; a shaft that is press-fitted into said shaft insertion aperture so as to integrate said first and second pole cores; a bobbin that is mounted to said abutted boss portions; and a field coil that is wound onto said bobbin, wherein a cross-sectional shape of said boss portion that is perpendicular to said central axis at root portions of said core flange portions is a 2n-sided polygon, and each of said claw-shaped magnetic pole portions faces a side of said cross-sectional shape of said boss portion that is perpendicular to said central axis at said root portions of said core flange portions.