Patent ID: 9273691
Filing Date: 2016-03-01
CPC Classification: F04D,H02K

Claim Text:
1. A rotor comprising: a first rotor core including a disk-shaped first core base and a plurality of first hook-shaped magnetic poles arranged at equal intervals on a peripheral portion of the first core base, wherein each of the first hook-shaped magnetic poles protrudes outward in a radial direction of the rotor and includes a first extended portion that extends along an axial direction of the rotor; a second rotor core including a disk-shaped second core base and a plurality of second hook-shaped magnetic poles arranged at equal intervals on a peripheral portion of the second core base, wherein each of the second hook-shaped magnetic poles protrudes outward in the radial direction and includes a second extended portion that extends along the axial direction, and the first and second hook-shaped magnetic poles are alternately arranged along a circumferential direction of the rotor so that the first and second core bases are opposed in the axial direction; a field magnet arranged between the first and second core bases in the axial direction, wherein the field magnet is magnetized along the axial direction so that the first hook-shaped poles function as first poles and the second hook-shaped poles function as second poles; and an auxiliary magnet includes at least two or more interpolar magnet portions that are integrally formed, wherein each of the interpolar magnet portions is arranged in a void between the first hook-shaped poles and the second hook-shaped poles and magnetized in the circumferential direction, wherein the auxiliary magnet includes back magnet portions arranged on back surfaces of the first and second hook-shaped poles, wherein the back magnet portions are magnetized so that an outer part in the radial direction facing the corresponding back surface has the same polarity as the corresponding hook-shaped pole, each of the interpolar magnet portions extends outward in the radial direction from the back magnet portion and is magnetized so as to have same polarity as the first and second hook-shaped poles that are adjacent to each other, the auxiliary magnet includes the back magnet portion and the interpolar, magnet portions that are integrally formed, and the auxiliary magnet contacts the corresponding hook-shaped pole in the radial direction and the circumferential direction, and the auxiliary magnet is magnetized so as to have the same magnetized direction as the corresponding hook-shaped poles magnetized by the field magnet.