Patent ID: 7408280

Claim:
A rotor of a rotary electric machine comprising: a boss portion on which a field coil is wound, a field magnet flux flowing in an axis direction of the boss portion; a pair of disk portions extended in a radial direction toward an outside of the boss portion from both ends of the boss portion in the axis direction, and through which the field magnetic flux flows toward the outside of the disk portions in the radial direction; and a magnetic-pole cylindrical portion placed between the pair of disk portions, made of soft magnetic sheets laminated in the axis direction, and having an easy deformation characteristic compared to that of the boss portion and the disk portions, the magnetic-pole cylindrical portion comprising: even number magnet pole parts formed at a desired pitch in a circumference direction of the magnetic-pole cylindrical portion, and magnetically mating the pair of disk portions alternately in the circumference direction; and boundary parts having connection parts mechanically connecting adjacent magnet pole parts together in the circumference direction, wherein a concave part of a ring shape and a convex part of a pole shape surrounded by the concave part are formed in each connection part between adjacent magnetic pole parts in each soft magnetic sheet.