Patent ID: 8704472

Claim:
A brushless electric motor comprising: a stator having a circumferential direction; a rotor arranged to face with the stator and to be rotatable; an annular A-phase winding WA wound in the circumferential direction of the stator; a stator pole group SPGA configured to generate magnetic flux φA to interlink with the A-phase winding WA; an annular B-phase winding WB wound in the circumferential direction of the stator; a stator pole group SPGB configured to generate magnetic flux to interlink with the B-phase winding WB; a third stator pole group SPGC arranged at the stator; N magnetic poles arranged at the rotor; S magnetic poles arranged at the rotor; and X magnetic poles arranged at the rotor as third rotor poles showing a magnetic characteristic which is between magnetic characteristics of the N magnetic poles and the S magnetic poles of the rotor, wherein at least one of the stator pole groups SPGA and SPGB has a magnetic pole width SPH of 180 degrees or less in an electrical angle in the circumferential direction.