Patent ID: 7550884
Filing Date: 2009-06-23
Classification: H02K

Abstract:
1. A brushless motor comprising: a rotor portion which rotates about a predetermined center axis and including a rotor magnet; a bearing unit which supports the rotor portion in a rotatable manner; a stator opposed to the rotor magnet in a radial direction perpendicular to or substantially perpendicular to the center axis, wherein the stator includes: a stator core having a plurality of teeth extending in the radial direction and an annular core back portion connecting the teeth to one another, the core back portion having a penetrating hole axially penetrating therethrough; a coil formed by winding a conductive wire around each of the teeth; and a connecting wire portion, formed by a portion of the conductive wire arranged between two of the teeth, operable to continuously connect the two teeth while retaining a conductive state; and a base including a hollow body and a stator placing portion, the hollow body supporting the bearing unit and having an outer side surface facing an inner side surface of the core back portion of the stator, the stator placing portion being in contact with an axially lower surface of the core back portion and having a substantially flat surface substantially perpendicular to the center axis, wherein the stator placing portion has an opening hole at a position corresponding to the penetrating hole, wherein the stator placing portion is formed at a first horizontal level, wherein the stator placing portion is provided with a cutout portion in a step shape formed at a second horizontal level, the second horizontal level being lower than the first horizontal level, wherein the cutout portion is formed such that a radially outer edge of the opening hole is located radially outside that of the stator placing portion, the stator is fixed to the base with a fixing member inserted through the penetrating hole and the opening hole, and an upper surface of the stator placing portion and the connecting wire portion are spaced apart from each other, wherein the connecting wire portion runs through a space between the first horizontal level of the stator placing portion and the cutout portion.