Patent ID: 10047754

Abstract:
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.