Fan motor structure

Abstract

Disclosed herein is a fan motor structure including: a shaft; a bearing member coupled to the shaft; a stator coupled to the shaft and disposed at one side of the bearing member; an impeller having a coupling hole and a space part formed therein so as to be in communication with each other, the coupling hole having the bearing member coupled thereto and the space part having the stator received therein; a yoke formed on an inner peripheral surface of the space part; a magnet formed on an inner peripheral surface of the yoke; a diffuser to which an end portion of the shaft is fixed; and a cover coupled to the diffuser and covering the impeller. According to a preferred embodiment of the present invention, a size of the fan motor is decreased.

What is claimed is: 
     
         1 . A fan motor structure comprising:
 a shaft;   a bearing member coupled to the shaft;   a stator coupled to the shaft and disposed at one side of the bearing member;   an impeller having a coupling hole and a space part formed therein so as to be in communication with each other, the coupling hole having the bearing member coupled thereto and the space part having the stator received therein;   a yoke formed on an inner peripheral surface of the space part;   a magnet formed on an inner peripheral surface of the yoke;   a diffuser to which an end portion of the shaft is fixed; and   a cover coupled to the diffuser and covering the impeller.   
     
     
         2 . The fan motor structure as set forth in  claim 1 , wherein relative rotation of the shaft with respect to the diffuser is not allowed. 
     
     
         3 . The fan motor structure as set forth in  claim 1 , wherein the bearing member includes a bearing including inner and outer races,
 the inner race is fixed to the shaft, such that relative rotation thereof with respect to the shaft is not allowed, and   the outer race is coupled to the coupling hole, such that it rotates integrally with the impeller.   
     
     
         4 . The fan motor structure as set forth in  claim 1 , wherein the bearing member includes two bearings disposed to be adjacent vertically to each other and including inner and outer races,
 the inner race is fixed to the shaft, such that relative rotation thereof with respect to the shaft is not allowed, and   the outer race is coupled to the coupling hole, such that it rotates integrally with the impeller.   
     
     
         5 . The fan motor structure as set forth in  claim 4 , wherein the bearing member further includes a bearing housing rotating integrally with the outer race while receiving the two bearings therein, and
 the impeller has the bearing housing coupled to the coupling hole thereof while being received in the coupling hole thereof, such that it rotates integrally with the bearing housing.   
     
     
         6 . The fan motor structure as set forth in  claim 1 , wherein the bearing member further includes a sealing part formed at one side thereof to cover a gap between an outer peripheral surface of the shaft and an inner peripheral surface of the bearing member. 
     
     
         7 . The fan motor structure as set forth in  claim 1 , wherein the space part is provided with an extension part receiving the yoke and the magnet therein. 
     
     
         8 . The fan motor structure as set forth in  claim 1 , further comprising a printed circuit board provided on an upper surface of the diffuser. 
     
     
         9 . The fan motor structure as set forth in  claim 8 , wherein the printed circuit board includes a sensing unit sensing a rotational speed of the magnet. 
     
     
         10 . The fan motor structure as set forth in  claim 9 , wherein the sensing unit is a hall sensor. 
     
     
         11 . The fan motor structure as set forth in  claim 1 , wherein the bearing member is press-fitted into the coupling groove. 
     
     
         12 . The fan motor structure as set forth in  claim 1 , wherein the shaft has a low end portion press-fitted into the diffuser. 
     
     
         13 . The fan motor structure as set forth in  claim 1 , wherein the cover is provided with a fitting groove,
 the diffuser is provided with a fitting protrusion fitted into the fitting groove, and   the cover and the diffuser are coupled to each other by fitting the fitting protrusion into the fitting groove.