Patent ID: 8890386

Claim:
A rotor having a circumferential direction, radial directions, and an axial direction, the rotor comprising: a first rotor core including a first main body portion and a plurality of first extensions, which extend radially outward from the first main body portion at equal intervals in the circumferential direction; a second rotor core including a second main body portion and a plurality of second extensions, which extend radially outward from the second main body portion at equal intervals in the circumferential direction; and a field magnet, which is placed between the first rotor core and the second rotor core in the axial direction and is magnetized in the axial direction to cause the first extensions to function as first magnetic poles and the second extensions to function as second magnetic poles, wherein a magnetic pole constituting section including at least part of each of the first extensions and the first main body portion are manufactured with different materials, manufactured with the same material but formed as separate elements, or include regions having different properties, and a magnetic pole constituting section including at least part of each of the second extensions and the second main body portion are manufactured with different materials, manufactured with the same material but formed as separate elements, or include regions having different properties.