Miniature Heat-Dissipating Fan

Abstract

A miniature heat-dissipating fan includes a stator and a rotor. The stator has a first leakage flux absorber and a coil layer that is arranged on the first leakage flux absorber and has a plurality of coils. An annular wall is formed on an outer edge of the first leakage flux absorber of the stator to define an air inlet, an air outlet and a compartment. The first leakage flux absorber has a shaft tube in the compartment and the coil layer is mounted around the shaft tube. The rotor is received in the compartment of the stator and has an impeller, a second leakage flux absorber and a permanent magnet. The impeller has a shaft rotatably inserted in the shaft tube of the stator and both the second leakage flux absorber and the permanent magnet are attached to a bottom of the impeller.

1 . A miniature heat-dissipating fan, comprising:
 a stator having a first leakage flux absorber and a coil layer that is arranged on the first leakage flux absorber and has a plurality of coils, with an annular wall being formed on an outer edge of the first leakage flux absorber of the stator to define an air inlet, an air outlet and a compartment, with the first leakage flux absorber having a shaft tube in the compartment and the coil layer being mounted around the shaft tube; and   a rotor being received in the compartment of the stator and having an impeller, a second leakage flux absorber and a permanent magnet, with the impeller having a shaft being rotatably inserted in the shaft tube of the stator and both the second leakage flux absorber and permanent magnet being attached to a bottom of the impeller.   
     
     
         2 . The miniature heat-dissipating fan as defined in  claim 1 , wherein a printed circuit board is attached to a surface of the first leakage flux absorber and the coil layer is formed on the printed circuit board by layout. 
     
     
         3 . The miniature heat-dissipating fan as defined in  claim 1 , wherein a lid is mounted to one side of the first leakage flux absorber where the air inlet is formed, with the lid having a through hole aligned with the air inlet.