Patent ID: 7608959

Claim:
A brushless motor comprising: an armature including an annular core back having a substantially cylindrically shaped outer circumferential surface which extends along a central axis, a plurality of teeth each extending from the core back toward the central axis and having an end surface facing the central axis, and a coil formed by winding a conducting wire around each tooth; a cover including a cylinder portion whose inner diameter is greater than an outer diameter of the annular core back, and for covering the armature from radially outside thereof; a plurality of spacers each having a surface making contact with the outer circumferential surface of the annular core back and a surface making contact with an inner circumferential surface of the cylinder portion; a rotor, located radially nearer to the central axis than the tooth of the armature, for generating, due to an interaction between the tooth and rotor, a rotary drive force; and a bearing portion for supporting the rotor in such a manner that the rotor is allowed to rotate freely.