Patent ID: 8704412

Claim:
A rotary electric machine comprising: a stator including: a stator core including an approximately loop-shaped core back portion and a plurality of main poles projecting radially inward from the core back portion; and two-phase windings arranged around respective ones of the main poles of the stator core, each of the main poles including a plurality of teeth provided on a distal end thereof; a rotor including a rotor shaft, the rotor being arranged in a rotatable manner with an air gap provided between the rotor and the stator, and the rotor including: a pair of rotor magnetic poles of magnetic material; and an axially magnetized permanent magnet arranged between the rotor magnetic poles, each of the rotor magnetic poles including a plurality of magnetic teeth arranged equiangularly on an outer circumferential surface thereof, the rotor magnetic poles being offset from each other by ½ tooth pitch in a circumferential direction; metal bearings arranged to support the rotor shaft of the rotor with respect to the stator; and covers arranged on both sides of the stator in an axial direction and bearing holding members attached to the covers to respectively hold the metal bearings; wherein a step angle for the rotor is approximately 4.09; the bearing holding members are made of molded resin material and each includes: a main body; a fitted portion having an outer diameter approximately equal to an inner diameter of the main poles of the stator core and arranged to be fitted to the inside of the main poles at an axial end of the stator core; a stepped surface arranged to be in contact with the axial end of the stator core to define a depth of fitting of the fitted portion to the inside of the main poles; a substantially cylindrical spigot portion including a projecting end which is arranged to project from a corresponding one of the covers on a motor-output side; and a bearing support surface arranged to support a corresponding one of the bearings; an outer circumferential surface of the fitted portion, an outer circumferential surface of the spigot portion, and the bearing support surface are concentric or substantially concentric with one another; and the bearing holding members are substantially symmetrically arranged on both axial sides of the stator core.