Shaftless cooling fans

Abstract

A shaftless cooling fan is comprised of a fan body pivotally mounted on a fan base through a configured shaft. The fan base further comprises a plurality of vents, an electrical device for driving the fan body, a recess in its top and bottom ends for positioning a shaft end respectively, and a plurality of electromagnets surrounding the recess in the bottom end. The fan body is rotatably positioned in the fan base by placing the shaft ends in respective recesses, and there is also a plurality of permanent magnets aligned surrounding the lower shaft end, in which every permanent magnet is comprised of a magnetic N-zone, an S-zone, and a Neutral zone, and repeatedly structured. Every electromagnet is controlled by the electrical device to form magnetic zones corresponding to the N-zone, S-zone, and Neutral zone of each the permanent magnet, such that each permanent magnet is driven to rotate the fan body by changing the magnetic zones in each electromagnet.

1 . A shaftless cooling fan, comprised of a fan body having a configured shaft rotatably jointed to a fan base, said shaft being extended radially to form a plurality of fan leaves, said fan base being a square hollow casing having at least an opening penetrating the casing itself in its top end and lateral wall, and an electrical device for driving said fan body, in which: 
 a recess for positioning a shaft end is formed at respective corresponding positions of the lower surface of a top end and the upper surface of a bottom end in said fan base; the electrical device is extended to the upper surface of the bottom end of the fan base to form a plurality of electromagnets, which is aligned surrounding said recess in the upper surface of the bottom end of said fan base;    said shaft having a plurality of permanent magnets in its bottom face is tapered at both ends for mating with the recesses of said fan base so that each shaft end can be rotatably fitted in each recess; and    a magnetic N-zone, an S-zone, and a Neutral zone are arranged repeatedly and rotationally in every permanent magnet, and the magnetic zones of each electromagnet are controlled correspondingly to that of each said permanent magnet.    
   
   
       2 . The shaftless cooling fan according to  claim 1 , in which each shaft end is substantially point-contacted with each recess.