Patent ID: 9318928
Filing Date: 2016-04-19
CPC Classification: H02K

Claim Text:
1. A brushless motor, comprising: a stationary unit comprising a base member and a bearing mechanism; and a rotary unit rotatably supported by the bearing mechanism, the rotary unit comprising a hub, a shaft, a rotor yoke and a magnet, the shaft having a central axis, wherein the stationary unit comprises: wherein the hub is made of a magnetic material, the hub comprising: wherein the rotor yoke is made of a magnetic material, the rotor yoke fixed to a radially outer side of the hub protrusion portion such that the rotor yoke is axially opposed to a lower surface of the armature, wherein the magnet is fixed to a lower surface of the second part of the hub such that the magnet is axially opposed to an upper surface of the armature while an upper surface of the magnet is entirely covered by the second part of the top plate portion, wherein the base member includes an inner circumferential surface defining the base through-hole, the bearing mechanism axially opposed to the first part of the top plate portion, the bearing mechanism including an outer circumferential surface, the inner circumferential surface of the base member arranged to make contact with the outer circumferential surface of the bearing mechanism or to radially oppose the outer circumferential surface of the bearing mechanism across an adhesive agent in a first fixing portion, wherein the rotor yoke is arranged to make contact with the hub protrusion portion or to radially oppose the hub protrusion portion across an adhesive agent in a second fixing portion, and wherein the brushless motor satisfies a relationship of d