| 摘要 |
PROBLEM TO BE SOLVED: To provide a brushless motor wherein phase error between a permanent magnet of a rotor and a magnetic pole of a sensor magnet fit which is generated during assembling process is made as small as possible, and a structure which is easy to assemble is obtained. SOLUTION: A gear part 20, constituted of plural teeth which as a tooth surface of an involute curve, is formed on an output peripheral surface in the vicinity of one end portion of a rotating shaft 3. An engaging gear part 21, constituted of plural teeth which has a tooth surface of the involute curve and engages with the gear part 20, is formed on an inner wall of an insertion hole, into which the rotating shaft 3 of the sensor magnet 7A is inserted. The sensor magnet 7A and the rotating shaft 3 are fixed mutually in the peripheral direction of the rotating shaft 3 by engagement of the gear part 20 and the engaging gear part 21. Movement to the end of the rotating shaft 3 is obstructed, by fitting a push nut 24 in the rotating shaft 3. |
