Field core structure for rotary electric machine rotor

A rotary electric machine rotor comprising:

• a Lundell core that comprises:
• a cylindrical portion;
• a pair of ring-shaped yoke portions that are disposed on two axial end portions of said cylindrical portion;
• and
• a plurality of claw-shaped magnetic pole portions that are disposed so as to extend axially alternately from each of said pair of yoke portions, said claw-shaped magnetic pole portions being arranged circumferentially so as to intermesh with each other;
• a rotating shaft that is inserted into and fixed to a central axial position of said Lundell core;
• a bobbin that comprises:
• an annular drum portion that is mounted around an outer circumference of said cylindrical portion;
• and
• a pair of flat ring-shaped flange portions that protrude radially outward from two axial end portions of said drum portion;
• a field coil that is wound in multiple layers in a space that is surrounded by said drum portion and said pair of flange portions, said field coil contacting a vicinity of roots of inner circumferential surfaces of said claw-shaped magnetic pole portions;
• and
• a cooling fan that supplies air to an outer circumferential surface of said field coil,
• wherein said field coil is formed so as to have a peaked shape in which only two or three peaks line up consecutively in an axial direction, an apex portion of each of said peaks being positioned radially further outward than a root position of said claw-shaped magnetic pole portions.