Fan

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.

1 . A fan comprising:
 a fan frame, said fan frame comprising a base and a barrel perpendicularly extending from the center of said base;   a fan blade unit, said fan blade unit comprising a fan hub and a plurality of blades radially connected to said fan hub;   a driving module, said driving module comprising a stator affixed to said barrel of said fan frame, said stator comprising a collar sleeved onto said barrel of said fan frame and a plurality of radial ribs radially extending from and equiangularly spaced around the periphery of said collar for the winding of a respective winding, at least one axle bearing mounted inside said barrel of said fan frame, a core shaft affixed to said fan hub of said fan blade unit and supported in said at least one axle bearing, and at least one rotor affixed to an inner side of said fan hub and spaced around said stator;   wherein said stator comprises a plurality of three-dimensional wings respectively connected to the free ends of said radial ribs remote from said collar, said three-dimensional wings each having a smoothly arched surface radially and axially extending at an outer side.   
   
   
       2 . The fan as claimed in  claim 1 , wherein said stator is made out of a magnetic material to provide a three-dimensional magnetic path, said magnetic material being elected from one of the soft magnetic metal materials including Fe, Ni, Si and Co and the ferromagnetic materials including MO—Fe 2 0 3 , MO-6Fe 2 0 3  and MM '0 3 . 
   
   
       3 . The fan as claimed in  claim 1 , wherein said radial ribs of said stator have the shape of a straight bar. 
   
   
       4 . The fan as claimed in  claim 1 , wherein said radial ribs of said stator have the shape of a cross. 
   
   
       5 . The fan as claimed in  claim 1 , wherein said radial ribs of said stator have a star-shaped cross section. 
   
   
       6 . The fan as claimed in  claim 1 , wherein said fan hub is shaped like a flat cup, having a radially and axially extending smoothly curved outer surface. 
   
   
       7 . The fan as claimed in  claim 1 , wherein said fan hub has a nose-like shape and a radially and axially extending smoothly curved outer surface. 
   
   
       8 . The fan as claimed in  claim 1 , wherein said radial ribs of said stator are solid prism having a stepped cross section. 
   
   
       9 . The fan as claimed in  claim 1 , wherein said stator is made in integrity by means of one of the techniques of powder metallurgy, mechanical processing and casting. 
   
   
       10 . The fan as claimed in  claim 1 , wherein said collar, said radial ribs and said wings of said stator are separately made and fastened together by means of one of bonding technique, welding technique, riveting, screw joint and plug joint 
   
   
       11 . The fan as claimed in  claim 1 , wherein said wings of said stator each have a smoothly arched surface which is composed by different flat surface, curve surface, arched surface and cylindrical surface. 
   
   
       12 . The fan as claimed in  claim 1 , wherein said rotor is formed of an annular magnet, said annular magnet having an inner surface fitting the curvature of the wings of said stator. 
   
   
       13 . The fan as claimed in  claim 1 , wherein said barrel in the center of said fan frame is assembled with a hollow part which is assembled with said stator at the hollow part outside and the bottom of hollow part to connect with a circuit board to form a fan control circuit. 
   
   
       14 . The fan as claimed in  claim 1 , wherein said collar inside of said stator is formed integral with the bearing where the bearing assembled in the center of said fan frame to displace said barrel.