Patent ID: 8403653
Filing Date: 2013-03-26
Classification: F04D,H02K

Abstract:
1. An axial flow fan comprising: a motor including: an impeller arranged at an upper axial end of the stator to rotate with the shaft; a case including a tubular portion housing therein the stator, and a bottom portion arranged below the rotor magnet and including a plurality of through holes; and a substrate arranged to connect end portions of the coils; wherein the substrate is arranged below the bottom portion with an, axial space therebetween; a spacer is arranged axially below the bottom portion, and the substrate is attached to the spacer; the spacer includes at least one through hole arranged to penetrate the spacer in an axial direction, the at least one through hole being arranged between the bottom portion and the substrate; the motor is a polyphase motor, the substrate includes projections projecting radially outwardly, and a number of phases of the motor corresponds to a number of the projections; and the bottom portion includes at least one attachment hole arranged at an area of the bottom portion that is located circumferentially between a pair of the projections, the at least one attachment hole being separate from the plurality of through holes.