Patent ID: 8382450
Filing Date: 2013-02-26
Classification: F04D

Abstract:
1. A centrifugal fan comprising: a hub substantially in the shape of a cylinder with a covered end centered on a central axis; an impeller arranged radially outward of the hub; a magnet attached to an inside of the hub; an armature arranged radially opposite the magnet; a bearing mechanism arranged to support the hub such that the hub is rotatable about the central axis with respect to the armature; a bearing housing arranged to support the bearing mechanism; a base arranged to support a lower end portion of the bearing housing, the base being a plate-shaped member; a side wall including an air outlet defined therein, and arranged radially outward of the impeller to surround the impeller; a cover including an air inlet defined therein, and arranged axially above the side wall; a housing including the base, the side wall, and the cover; a circuit board arranged on an upper surface of the base; and a control circuit portion including electronic components and arranged on the circuit board; wherein the circuit board includes a protruding portion arranged to protrude outward of an outer surface of the side wall of the housing in a direction including a radial component, the protruding portion including a freely extending portion which is not in direct surface-to-surface contact with the base; at least one of the electronic components is arranged on the protruding portion; and a terminal portion is completely arranged on the freely extending portion of the protruding portion.