Cooling fan with blades for rotating electrical machine, particularly motor vehicle alternator, has outer tips of principal blades folded over to control air flow at blade tips

摘要

The fan has a first set of blades (30) forming ventilation passages (40) divergent toward the exterior. Some of these blades have the top edge folded over (60) to reduce secondary recirculation of air above the blades. The height of these blades decreases as they progress radially outward.