Patent ID: 8067874

Claim:
A Lundell motor apparatus comprising: a stator having a stator coil with a plurality of phase windings; a Lundell-type rotor disposed so as (a) to face an inner circumferential surface of said stator with an electromagnetic gap therebetween and (b) to be rotatable around an axial direction thereof; said Lundell-type rotor including a rotor core made of soft magnetic material and including a cylindrical boss section, a plurality of claw pole sections which extend from both axial ends of said rotor core at a predetermined circumferential pitch and then extend in said axial direction such that said claw pole sections extending from one of said axial ends alternate with said claw pole sections extending from the other of said axial ends in a circumferential direction of said Lundell-type rotor, and a field coil wound around said boss section, a control section which controls a field current passed to said field coil and an armature current passed to said stator coil in order to generate a torque, wherein a circumferential width of said claw pole sections is between 60 and 90 degrees in electrical angle.