Abstract: A fan includes a fan frame having an upright barrel, a fan blade unit having a fan hub with radial blades, and a driving module formed of a stator, an axle bearing, a core shaft and a rotor for causing rotation of the fan hub with the blades relative to the stator. The stator has a collar affixed to the barrel of the fan frame, radial ribs extending from and spaced around the periphery of the collar, and three-dimensional wings respectively connected to the free ends of the radial ribs each three-dimensional wings having a smoothly arched and radially and axially extending outer surface.