Patent ID: 6830440
Filing Date: 2004-12-14
Classification: H02K

Abstract:
A fan having a frame manufactured from plastic material and incorporating an external rotor brushless DC motor, the motor comprising:a stator assembly base having a base plate; the stator assembly base being manufactured from a thermally conductive material; a winding assembly affixed to the stator assembly base; circuitry associated with the motor, wherein the base plate is disposed between the circuitry and the winding assembly and has a side wall depending away from the winding assembly, the side wall being within an air flow generated, in use, by the fan and comprising part of a heat transfer path to dissipate heat away from the motor; and the circuitry having heat generating components, wherein at least one of the heat generating components is mounted on a printed circuit board and overhangs an edge of the printed circuit board and attaches directly to the base plate hence conducting heat away from the overhanging component into the base plate.