Patent ID: 7042121
Filing Date: 2006-05-09
Classification: F04D,H02K

Abstract:
1. A cooling fan, comprising: an electric motor comprising a stator, a rotor, a multi-part motor housing and an electronics module, wherein the motor housing arranged to form at least a motor front plate facing a front direction and a rear part of the motor housing facing away from the front direction and forming a rear plate of the motor; a fan wheel located in front of the electric motor, the fan wheel comprising a bowl-shaped fan wheel hub arranged so as to turn with the rotor and enclose the motor housing axially and radially spaced at least partly in a bowl shape such that between an outside of the motor housing and an inside of the fan wheel an air gap is formed in which protrusions of the fan wheel hub inner side extend thereby operating as air scoops; the fan wheel hub arranged so as to rotate with the rotor and create a pressure difference between the rear side and the front side of the electric motor; and the electronics module attached directly to the rear part of the motor housing so as to conduct heat, the rear part of the motor housing arranged to act as a heat sink to remove the heat energy generated by the electronics module and emit the heat energy into a stream of cooling air created by the difference in pressure, and first cooling elements arranged in and/or on inlet openings in the rear of the motor so as to be cooled by the cooling air flow on entry into the interior of the motor housing and on the radial outside edge of the rear part of the motor housing in the outlet area of an air outlet gap formed by the fan wheel hub running around an edge of second cooling elements arranged to be cooled by the cooling air flow on exit from the air outlet gap.