Impeller and electric blower having the same

Abstract

Disclosed herein is an impeller including: an upper surface, which is an air inlet portion; a lower surface, which is an air outlet portion; and blades formed between the upper and lower surfaces, wherein the upper and lower surfaces are provided with guide grooves for balancing of a motor.

What is claimed is: 
     
         1 . An impeller comprising:
 an upper surface, which is an air inlet portion;   a lower surface, which is an air outlet portion; and   blades formed between the upper and lower surfaces,   wherein the upper and lower surfaces are provided with guide grooves for balancing of a motor.   
     
     
         2 . The impeller as set forth in  claim 1 , wherein the guide groove is formed in a circular shape in a rotation direction of the impeller. 
     
     
         3 . An electric blower comprising:
 an impeller including an upper surface, which is an air inlet portion, a lower surface, which is an air outlet portion, and blades formed between the upper and lower surfaces, the upper and lower surfaces provided with guide grooves for balancing of the motor; and   a driving module including a rotor part coupled to the impeller in order to drive the impeller and a stator part, the rotor part including a magnet, the stator part including an armature configured of a core and a coil that are positioned to face the magnet, and the rotor part and the stator part including an air bearing part formed therebetween,   wherein the rotor part and the impeller are rotated by electromagnetic force of the magnet and the armature, and the driving module is received in the impeller.   
     
     
         4 . The electric blower as set forth in  claim 3 , wherein the rotor part of the driving module includes:
 a sleeve rotatably supported by a shaft; and   a hub coupled to the sleeve and including the magnet coupled to an inner peripheral portion thereof.   
     
     
         5 . The electric blower as set forth in  claim 3 , wherein the sleeve and the shaft are mounted with magnetic bearing magnets at surfaces facing each other, respectively. 
     
     
         6 . The electric blower as set forth in  claim 5 , wherein the magnetic bearing magnet is mounted at an upper end portion of the sleeve. 
     
     
         7 . The electric blower as set forth in  claim 3 , wherein the rotor part of the driving module includes:
 a sleeve rotatably supported by the shaft; and   a magnet coupled to the sleeve so as to face the armature of the stator part.   
     
     
         8 . The electric blower as set forth in  claim 3 , wherein the stator part of the driving module includes:
 a shaft rotatably supporting the rotor part;   a base to which the shaft is fixedly coupled; and   the armature coupled to the base and configured of the core and the coil.   
     
     
         9 . The electric blower as set forth in  claim 8 , wherein the shaft has a micro gap with the sleeve and is insertedly coupled to the sleeve so that an air bearing part is formed, and dynamic pressure generating grooves are formed in an outer peripheral surface of the shaft facing the sleeve in a radial direction of the shaft. 
     
     
         10 . The electric blower as set forth in  claim 9 , wherein the shaft further includes a ball mounted on a surface facing the impeller in an axial direction of the shaft. 
     
     
         11 . The electric blower as set forth in  claim 10 , wherein the shaft is formed with a ball receiving groove for mounting the ball at a central portion of an upper end surface thereof. 
     
     
         12 . The electric blower as set forth in  claim 11 , wherein the impeller further includes a plate mounted on a surface facing the ball. 
     
     
         13 . The electric blower as set forth in  claim 1 , further comprising:
 an impeller cover covering the impeller; and   a motor housing coupled to the impeller cover and including the stator part mounted therein.