Cooling fan with blades of decreasing height for rotating electrical machine, particularly motor vehicle alternator, has outer tips of principal blades lower than inner ends

摘要

The fan has a first set of blades (30) forming ventilation passages (40) divergent toward the exterior. Some of these blades have decreasing height between inner and outer ends respectively. Some blades have the top edge folded over (60) to reduce secondary recirculation of air above the blades.