Patent ID: 7919900

Claim:
A Lundell motor apparatus comprising: a stator on which a stator coil constituted by a plurality of phase windings is wound; and a Lundell-type rotor disposed so as to face an inner circumferential surface of said stator with an electromagnetic gap therebetween and be rotatable around an axial direction thereof; said Lundell-type rotor including a rotor core made of soft magnetic material and constituted by 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, said Lundell motor apparatus further comprising 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 required torque, said Lundell-type rotor further including a cylindrical section made of soft magnetic material having an inner circumferential surface which radial outer end surfaces of said claw pole sections are fitted to, and a plurality of permanent magnets housed in a plurality of magnet housing holes formed in said cylindrical section, each of said magnet housing holes is located between a q-axis section defined by a first radial end portion of said cylindrical section radially outward of one of each circumferentially adjacent two of said claw pole sections and a d-axis section defined by a portion of said cylindrical section located between said first portion and a second radial end portion of said cylindrical section radially outward of the other of said each circumferentially adjacent two of said claw pole sections, each two of said permanent magnets located on circumferentially opposite sides of each d-axis pole section being magnetized in circumferentially opposite directions, each two of said permanent magnets located on circumferentially opposite sides of each q-axis pole section being magnetized in circumferentially the same direction.