BRUSHLESS MOTOR AND FAN USING THE MOTOR

摘要

A brushless motor 5 of the present invention comprises: a rotor magnet 13 having a magnetized circumferential surface 13a comprising an upper circumferential surface 13a1 magnetized with a plurality of magnetic poles and a lower circumferential surface 13a2 magnetized with a plurality of magnetic poles; and a stator 30 having a stator stack 31 at least partially facing the lower circumferential surface 13a2, wherein the upper circumferential surface 13a1 of the rotor magnet 13 has a surface magnetic flux density of substantially the same level from a center of a magnetic pole until a vicinity of an adjacent magnetic pole, and the lower circumferential surface 13a2 of the rotor magnet 13 has a surface magnetic flux density decreasing from a center of a magnetic pole toward an adjacent magnetic pole.

主权项

1. A brushless motor comprising:
a rotor magnet having a magnetized circumferential surface, the magnetized circumferential surface comprising an upper circumferential surface magnetized with a plurality of magnetic poles and a lower circumferential surface magnetized with a plurality of magnetic poles; and a stator having a stator stack at least partially facing the lower circumferential surface, wherein the upper circumferential surface of the rotor magnet has a surface magnetic flux density of substantially the same level from a center of a magnetic pole until a vicinity of an adjacent magnetic pole, and wherein the lower circumferential surface of the rotor magnet has a surface magnetic flux density decreasing from a center of a magnetic pole toward an adjacent magnetic pole in the lower circumferential surface or a surface magnetic flux density of substantially the same level at a vicinity of the center of the magnetic pole and decreasing from the vicinity of the center toward the adjacent magnetic pole in the upper circumferential surface.