Motor and magnetic bearing assembly thereof

Abstract

A motor includes a stator, a rotor, and a plurality of blades. The stator includes a stator base with an opening, a first magnetic structure disposed at a bottom of the opening, a magnetic pole disposed on the stator base, and a second magnetic structure disposed at a top of the magnetic pole. The rotor, coupled to the stator, includes a hub, a shaft, a third magnetic structure disposed at the hub and encircled one en of the shaft and corresponded to the first magnetic structure, and a fourth magnetic structure disposed at the hub without contacting the second magnetic structure. The blades encircle the rotor. The first and third magnetic structures attract the second and the fourth magnetic structures, respectively.

1 . A magnetic bearing assembly, comprising: 
 a first hub, having a first opening, a first magnetic structure disposed in the opening, and a second magnetic structure disposed at a portion of the first hub encircled the opening; and    a second hub, having a main body with a first protrusion protruding from a side thereof, a third magnetic structure disposed at the first protrusion and corresponding to the first magnetic structure, and a fourth magnetic structure disposed at the main body above or below the second magnetic structure without contacting the same;    wherein magnetic attraction is generated between the first and the third magnetic structures, and magnetic attraction is generated between the second and the fourth magnetic structures, and    wherein the first magnetic structure has a first magnet and a second magnet disposed at a periphery of the first magnet, the second magnet of the first magnetic structure and the third magnetic structure attract each other, and the first magnet of the first magnetic structure and the third magnetic structure repel each other.    
   
   
       2 . The magnetic bearing assembly as claimed in  claim 1 , wherein the second hub further comprises a second opening located on the other side of the main body.  
   
   
       3 . The magnetic bearing assembly as claimed in  claim 1 , further comprising an intermediate structure, located between the first magnetic structure and the end of the first protrusion, or between the end of the first protrusion and a wear-resistant structure.  
   
   
       4 . The magnetic bearing assembly as claimed in  claim 3 , wherein the intermediate structure has a curved face or has a shape which is spherical, elliptical, turbinate, tapered with a curved end, or arrow-shaped with a curved end.  
   
   
       5 . The magnetic bearing assembly as claimed in  claim 1 , further comprising a second protrusion, protruding from the other side of the main body, the fourth magnetic structure being disposed at the other side of the main body below the second magnetic structure without contacting the same.  
   
   
       6 . The magnetic bearing assembly as claimed in  claim 1 , wherein the second hub is formed by a plurality of sub hubs.  
   
   
       7 . The magnetic bearing assembly as claimed in  claim 1 , further comprising a wear-resistant structure, positioned between the first magnetic structure and the end of the first protrusion, and contacting the end of the first protrusion at a contact point or a little contact area.  
   
   
       8 . The magnetic bearing assembly as claimed in  claim 1 , wherein the first magnetic structure has a first magnet and a second magnet disposed at a periphery of the first magnet, the second magnet of the first magnetic structure and the third magnetic structure attract each other, and the first magnet of the first magnetic structure and the third magnetic structure repel, wherein the first magnet and the second magnet of the first magnetic structure are two opposite poles.  
   
   
       9 . The magnetic bearing assembly as claimed in  claim 1 , further comprising a magnetic conduction layer formed between the first magnetic structure and the bottom of the opening, the second magnetic structure and the periphery of the opening, the third magnetic structure and the main body, or the fourth magnetic structure and the main body.  
   
   
       10 . The magnetic bearing assembly as claimed in  claim 1 , wherein the first magnetic structure is disposed at a bottom of the opening or at a third protrusion which protrudes from a sidewall of the opening.  
   
   
       11 . The motor as claimed in  claim 1 , wherein the third magnetic structure is disposed at the main body and encircles one end of the first protrusion.  
   
   
       12 . A motor, adapted to be used in a fan, comprising: 
 a stator, having a stator base with an opening, a first magnetic structure disposed at the opening or at a protrusion protruding from a sidewall of the opening, and a second magnetic structure disposed at the stator base encircling the opening;    a rotor coupled to the stator, having a hub, a shaft, a third magnetic structure disposed at the shaft and corresponding to the first magnetic structure, and a fourth magnetic structure disposed at the hub without contacting the second magnetic structure; and    an intermediate structure, located between the first magnetic structure and the end of the shaft, or between the end of the shaft and a wear-resistant structure;    wherein magnetic force is generated between the first and the third magnetic structures, and magnetic force is generated between the second and the fourth magnetic structures.    
   
   
       13 . The motor as claimed in  claim 12 , wherein the material of the intermediate structure is magnetic conduction metal, magnetic conduction plastics, or other magnetic conduction materials.  
   
   
       14 . The motor as claimed in  claim 12 , wherein the intermediate structure has a curved face or has a shape which is spherical, elliptical, turbinate, tapered with a curved end, or arrow-shaped with a curved end.  
   
   
       15 . The motor as claimed in  claim 12 , wherein the third magnetic structure is disposed at the hub and encircles one end of the shaft.