Patent ID: 8177530
Filing Date: 2012-05-15
Classification: F04D

Abstract:
1. A miniature heat-dissipating fan comprising: a casing defining a compartment and a shaft tube in the compartment, with the casing having an air inlet and an air outlet both connected to the compartment; a stator disposed in the compartment of the casing and having a first leakage flux absorber, a coil layer arranged on the first leakage flux absorber, and a hole passing through the first leakage flux absorber and the coil layer, with the coil layer having a plurality of coils, wherein a flange is formed on an outer edge of the first leakage flux absorber of the stator and wherein an inner edge of the first leakage flux absorber contacts and surrounds the shaft tube, with the first leakage flux absorber having a flat receiving surface between the flange and the shaft tube; a printed circuit board attached to the flat receiving surface of the first leakage flux absorber, with the printed circuit board contacting and surrounding the shaft tube and with the flange contacting and surrounding the printed circuit board, the coil layer being formed on the printed circuit board; and a rotor having an impeller, a second leakage flux absorber and a permanent magnet, with the impeller having a shaft passing through the hole of the stator and being rotatably inserted in the shaft tube of the casing, with both the second leakage flux absorber and the permanent magnet being attached to a bottom of the impeller.