Patent ID: 8647077
Filing Date: 2014-02-11
Classification: F04D

Abstract:
1. A cooling fan for an electronic device, comprising: a three-phase DC motor comprising a stator and a rotor comprising a rare earth magnet; and an impeller comprising a hub to house the three-phase DC motor and a plurality of blades extending from the hub to a tip of each blade, wherein the impeller has an impeller diameter and each blade has a blade height that is at least 25% of the impeller diameter, wherein each blade has a chord profile that increases in chord length from a region proximate to the hub to a maximum chord length at a maximum chord length blade height, and a stagger angle of each blade increases from the hub to the tip of the blade; wherein: each blade has a stagger angle of about 24 degrees to 30 degrees at the hub and a stagger angle of about 50 degrees to 56 degrees at the tip.