Patent ID: 9379582
Filing Date: 2016-06-28
CPC Classification: H02K

Claim Text:
1. A motor comprising: a rotation shaft; a rotor including a first rotor core that includes a first core base, which is fixed to the rotation shaft, and a plurality of first claw magnetic pole portions, which are arranged at equal intervals on an outer circumferential portion of the first core base and extend in an axial direction from the outer circumferential portion, a second rotor core that includes a second core base, which is fixed to the rotation shaft, and a plurality of second claw magnetic pole portions, which are provided at equal intervals on an outer circumferential portion of the second core base and extend in the axial direction from the outer circumferential portion, wherein each of the second claw magnetic pole portions is arranged between the first claw magnetic pole portions that are adjacent to each other in a circumferential direction, and a field magnet arranged between the first core base and the second core base, wherein the field magnet is magnetized along the axial direction so that the first claw magnetic pole portions function as first magnetic poles and the second claw magnetic pole portions function as second magnetic poles; and a stator including a stator core arranged at an outer side of the rotor and including a plurality of teeth arranged at equal intervals along the circumferential direction, wherein radially inner surfaces of the plurality of teeth face radially outer surfaces of the first and second claw magnetic poles, and a coil wound around each of the teeth, wherein the coil generates a rotating magnetic field when supplied with power, wherein at least either the radially outer surfaces of the first claw magnetic pole portions and the second claw magnetic pole portions or the radially inner surfaces of the teeth each have a cross-sectional shape in a direction orthogonal to the axial direction that is not concentric to a circle of which center is an axis of the rotation shaft.