| 摘要 |
A rotor includes a first rotor core, a second rotor core, a field magnet, and a detected portion. The first rotor core includes a first core base and a plurality of first claw-shaped magnetic pole portions. The second rotor core includes a second core base and a plurality of second claw-shaped magnetic pole portions. The first and second core bases face to each other, and the first and second claw-shaped magnetic pole portions are alternately arranged in the circumferential direction. The field magnet is located between the first and second core bases in the axial direction. The field magnet has the first claw-shaped magnetic pole portion function as a first magnetic pole and has the second claw-shaped magnetic pole portion function as a second magnetic pole. A detected portion, which generates a magnetic flux, is arranged at an outer axial end surface of the first rotor core. |
| 主权项 |
1. A rotor comprising:
a first rotor core including a substantially disk-shaped first core base and a plurality of first claw-shaped magnetic pole portions arranged in a circumferential portion of the first core base at equal intervals, wherein each of the first claw-shaped magnetic pole portions project radially outward and extend in an axial direction; a second rotor core including a substantially disk-shaped second core base and a plurality of second claw-shaped magnetic pole portions arranged in a circumferential portion of the second core base at equal intervals, wherein each of the second claw-shaped magnetic pole portions project radially outward and extend in the axial direction, the first and second core bases face to each other, and the first and second claw-shaped magnetic pole portions are alternately arranged in a circumferential direction; a field magnet arranged between the first and second core bases in the axial direction, wherein the field magnet is magnetized in the axial direction so that the first claw-shaped magnetic pole portions function as first magnetic poles and the second claw-shaped magnetic pole portions function as second magnetic poles; and a detected portion that generates magnetic flux for detecting rotation positions of the first rotor core and the second rotor core, wherein each of the first rotor core and the second rotor core includes an inner axial end surface, which faces the field magnet in the axial direction, and an outer axial end surface, which is located at an opposite side of the inner axial end surface, the detected portion is arranged at the outer axial end surface of the first rotor core, the detected portion is an annular sensor magnet located at a position deviated from the first and second rotor cores in the axial direction, the sensor magnet includes a first sensor magnet portion, which faces the first and second claw-shaped magnetic pole portions in the axial direction, and a second sensor magnet portion, which is located at an opposite side of the first sensor magnet portion in the axial direction, and the sensor magnet is formed so that magnetized directions in the axial direction differ alternately in the circumferential direction, and the sensor magnet has an inner diameter that is larger than outer diameters of the first and second core bases, the first sensor magnet portion includes a plurality of first magnetic pole portions and a plurality of second magnetic pole portions alternately arranged in the circumferential direction, the first magnetic pole portions and the second magnetic pole portions have different magnetic poles, and the magnetic poles of the first magnetic pole portions and the magnetic poles of the second magnetic pole portions are respectively same as the magnetic poles of the first and second claw-shaped magnetic pole portions that face the first magnetic pole portions and the second magnetic pole portions. |
