Patent ID: 7414343

Claim:
A hybrid-excited rotating machine comprising: a stator having a stator winding of a multiphase Y-connection; a plurality of rotor magnetic poles fixed on a rotor shaft at a predetermined spacing in the circumferential direction and confronting the inner circumference of said stator through an air gap; a plurality of permanent magnets fixed at substantially central portions of said circumferential direction of all of said rotor magnetic poles and magnetized in the radial direction of said rotor shaft; and a plurality of field windings wound individually on all of said rotor magnetic poles, wherein each of said permanent magnets fixed at each of said rotor magnetic poles is magnetized in a direction opposite to the direction in which said permanent magnet fixed on an adjacent rotor magnetic pole is magnetized, wherein, in the case where said plurality of field windings are biased in a first predetermined direction, each said rotor magnetic pole has a single polarity, which corresponds to a polarity of said permanent magnet fixed at a substantially central portion of said rotor magnetic pole, due to an interaction between the magnetic flux generated by said biased field winding and the magnetic flux generated by said fixed permanent magnet, and wherein, in the case where said plurality of field windings are biased in a direction opposite to said first predetermined direction, each said rotor magnetic pole has a first polarity corresponding to the polarity of said fixed permanent magnet and second and third respective polarities that flank said first polarity, wherein the second and third polarities are opposite to said first polarity, due to an interaction between the magnetic flux generated by said reversely biased field winding and the magnetic flux generated by said fixed permanent magnet.