Patent ID: 8941277
Filing Date: 2015-01-27
Classification: H02K

Abstract:
1. A motor, comprising: a bearing holder having a substantially cylindrical shape axially extending along a vertically-extending center axis; a bearing unit fixed to a radial inner surface of the bearing holder; an attachment plate fixed to a radial outer surface of the bearing holder and extending in a direction perpendicular or substantially perpendicular to the center axis; a circuit board arranged on an upper surface or a lower surface of the attachment plate; a stator core arranged above the attachment plate and fixed to the radial outer surface of the bearing holder; a coil attached to the stator core; a shaft rotatably supported by the bearing unit; and a magnet rotating together with the shaft; wherein the attachment plate includes a flat portion including a circular hole arranged in a coaxial relationship with the center axis and a burring portion axially protruding from the circular hole; the bearing holder includes a plurality of holder protrusion portions each including a radial outer surface at least partially making contact with the burring portion and a plurality of holder recess portions positioned more radially inward than the plurality of holder protrusion portions, each of the plurality of holder recess portions including a radial inner surface at least partially making contact with the bearing unit; the plurality of holder protrusion portions and the plurality of holder recess portions being alternately arranged along a circumferential direction; and the burring portion includes a plurality of caulking sections plastically deformed radially outward to make contact with the circuit board, the plurality of caulking sections being arranged more radially outward than the plurality of holder recess portions.