Motor

Abstract

A motor includes a stator, a rotor, a top magnetic structure, and a bottom magnetic structure. The stator is disposed in a frame. The rotor is also disposed in the frame, corresponding to the stator. The rotor includes a shaft extending axially from the rotor. The bottom magnetic structure is at the bottom of the frame. The top magnetic structure is on the top of the frame. The top and bottom magnetic structures are opposite to each other in an axial direction. Magnetic attraction generated between the first magnetic structure and the shaft, and the second magnetic structure and the shaft positions the shaft therebetween such that the first magnetic structure, the second magnetic structure, and the shaft are coaxially aligned.

1 . A fan assembly comprising:
 a stator disposed in a frame;   a rotor disposed in the frame and corresponding to the stator and comprising a shaft without any sleeve, hydrodynamic, ceramic or ball supports;   at least one first magnetic structure disposed at a bottom of the frame; and   at least one second magnetic structure disposed in the frame;   wherein magnetic interaction generated between the first magnetic structure and the shaft, and the second magnetic structure and the shaft positions the shaft therebetween such that the first magnetic structure, the second magnetic structure, and the shaft are coaxially aligned.   
   
   
       2 . The fan assembly as claimed in  claim 1 , wherein the first magnetic structure and the second magnetic structure disposed opposite to each other in an axial direction. 
   
   
       3 . The fan assembly as claimed in  claim 1 , wherein the shaft directly contacts or magnetically attracts with the first magnetic structure or/and the second magnetic structure. 
   
   
       4 . The fan assembly as claimed in  claim 1 , further comprising at least one wear-resistant structure disposed between the shaft and the first magnetic structure, and the shaft and the second magnetic structure. 
   
   
       5 . The fan assembly as claimed in  claim 4 , wherein the shaft directly contacts the wear-resistant structure at a contact point. 
   
   
       6 . The fan assembly as claimed in  claim 1 , wherein a polarity of a side of the first magnetic structure facing the second magnetic structure is opposite to a polarity of a side of the second magnetic structure facing the first magnetic structure. 
   
   
       7 . The fan assembly as claimed in  claim 1 , wherein the rotor comprises at least one third magnetic structure with a first magnetic central plane, and the stator comprises at least one permeable structure with a second magnetic central plane corresponding to the third magnetic structure, wherein the first magnetic central plane is disposed slightly above or below the second magnetic central plane in an axial direction of the shaft. 
   
   
       8 . The fan assembly as claimed in  claim 1 , wherein the stator further comprises an opening defined at the center thereof with the shaft extended therein, and a protective structure disposed on a sidewall of the opening without contacting the shaft. 
   
   
       9 . The fan assembly as claimed in  claim 8 , wherein the protective structure is made of plastic, flexible material or vibration absorbing material. 
   
   
       10 . The fan assembly as claimed in  claim 1 , wherein an end surface of the shaft has a flat, curved, pointed, concave or convex shape, and the first magnetic structure and the second magnetic structure have end portions, each of the end portions, facing the shaft, with a curved, pointed, concave or convex shape corresponding to that of the end surface of the shaft. 
   
   
       11 . The fan assembly as claimed in  claim 1 , wherein when the shaft contacts the first and the second magnetic structures, the shape of the end surface of the shaft corresponds to the end portions of the first magnetic structure, the second magnetic structure or both. 
   
   
       12 . The fan assembly as claimed in  claim 4 , wherein an end surface of the shaft has a flat, curved, pointed, concave or convex shape, and the wear-resistant structure has an end, facing the shaft, with a flat, curved, pointed, concave or convex shape corresponding to that of the end surface of the shaft. 
   
   
       13 . The fan assembly as claimed in  claim 4 , wherein when the shaft contacts the wear-resistant structure at a contact point, the shape of the end surface of the shaft corresponds to the shape of the end of the wear-resistance. 
   
   
       14 . The fan assembly as claimed in  claim 1 , wherein the first or the second magnetic structures is a permanent magnet, a plastic magnet or an electromagnet. 
   
   
       15 . The fan assembly as claimed in  claim 1 , wherein the frame comprises an upper cover and a lower cover corresponding to each other and connected by fitting, engaging, gluing, locking or connecting via a cushion device. 
   
   
       16 . A fan assembly comprising:
 a base;   a stator disposed on the base;   a rotor coupled to the stator and having a shaft;   a first magnetic structure disposed at a bottom of the base and positioned under the shaft to generate a magnetic interaction between the shaft and the first magnetic structure.   
   
   
       17 . The fan assembly as claimed in  claim 16 , further comprising a second magnetic structure disposed at a top of the base, and a third magnetic structure disposed inside a hub of the rotor to generate a magnetic interaction between the second and third magnetic structures. 
   
   
       18 . The fan assembly as claimed in  claim 16 , further comprising a protective structure disposed in an axial tube of the base and around the shaft. 
   
   
       19 . The fan assembly as claimed in  claim 16 , further comprising a wear-resistant structure disposed between an end of the shaft and the first magnetic structure. 
   
   
       20 . The fan assembly as claimed in  claim 19 , wherein the end of the shaft has a shape corresponding to that of the first magnetic structure or the wear-resistant structure so as to form a point contact therebetween.