Electrical fan
View Patent ↗A electrical fan includes a frame ( 10 ) having a central tube ( 11 ), a bearing ( 30 ) received in the central tube, a stator ( 50 ) mounted around the central tube, and a rotor ( 70 ) being rotatably supported by a bearing in the stator. The frame defines an air inlet ( 19 ) and an air outlet ( 17 ) at two different sides thereof. The stator and the rotor expand radially along a direction from the air inlet to the air outlet. Fan blades ( 75 ) extend radially from the rotor. A hub ( 71 ) of the rotor has a streamline shaped outer surface. A stator core ( 511 ) of the stator is made by powder sintering technology.
1. An electrical fan comprising:
a fan housing having a central tube extending therein, the housing defining an air inlet and an air outlet at two different sides thereof;
a bearing received in the central tube;
a stator mounted around the central tube, the stator comprising a stator core having a disc-shaped top wall and a sidewall extending downwardly from an outer periphery of the top wall, a tube extending downwardly from a central portion of the top wall, and windings wound around the tube, the sidewall expanding radially along a direction from the air inlet to the air outlet; and
a rotor being rotatably supported by the bearing in the central tube the rotor comprising a hub having a shape substantially corresponding to the stator and expanding radially along the direction from the air inlet to the air outlet, and a plurality of fan blades extending radially from the hub towards the fan housing, a length of each of the fan blades in a radial direction of the hub gradually increasing along a direction from the air outlet to the air inlet for increasing a size of the each of the fan blades.
2. The electrical fan as claimed in claim 1 , wherein the rotor is hemisphere-shaped.
3. The electrical fan as claimed in claim 1 , wherein the rotor has a shape of a truncated cone.
4. The electrical fan as claimed in claim 1 , wherein the rotor has a shape of a hemi-ellipsoid.
5. The electrical fan as claimed in claim 1 , wherein a plurality of slots are defined in the sidewall of the stator core.
6. The electrical fan as claimed in claim 1 , wherein the stator core is integrally formed by powder sintering technology.
7. The electrical fan as claimed in claim 6 , wherein the stator core is made of composite soft magnet powder, a particle of the powder having a Core-Shell structure, wherein the shell has an electric resistance larger than that of the core.
8. A motor, comprising:
a stator having a stator core comprising a disc-shaped top wall, a sidewall extending downwardly from an outer-periphery of the top wall, a tube extending downwardly from a central portion of the top wall, and windings wound on the tube of stator core;
a rotor being rotatably supported by a bearing in the stator;
wherein the sidewall of the stator core expanding radially along an axial direction thereof, and the rotor has a shape substantially corresponding to the stator, the rotor comprising a hub expanding radially along a direction from an air inlet to an air outlet, and a plurality of fan blades extending radially from the hub, a length of each of the fan blades in a radial direction of the hub gradually increasing along the direction from the air outlet to the air inlet for increasing a size of the each of the fan blades.
9. The motor as claimed in claim 8 , wherein the stator core is integrally formed by powder sintering technology.
10. The motor as claimed in claim 8 , wherein the stator core has a shape of a hemisphere.
11. The motor as claimed in claim 8 , wherein a plurality of slots are defined in the sidewall of the stator core.
12. The motor as claimed in claim 8 , wherein the stator core has a shape of a truncated-coin.
13. The motor as claimed in claim 8 , wherein the stator core has a shape of a hemi-ellipsoid.
14. An electrical fan comprising:
a frame having an air inlet and an air outlet, an airflow generated by the electrical fan flowing from the inlet to the outlet;
a stator comprising:
a stator core integrally formed by powder sintering technology and having an outer wall and a center tube in the outer wall, the outer wall having a diameter gradually increasing along a direction from the inlet to the outlet; and
a winding wound around the center tube;
a bearing received in the tube of the stator core;
a rotor comprising:
a hub covering the stator core and having a diameter gradually increasing along the direction from the air inlet to the air outlet;
a shaft fixed to the hub and rotatably mounted in the bearing;
a permanent magnet attached to the hub; and
fan blades extending radially outwardly from the hub towards the frame, a length of each of the fan blades in a radial direction of the hub of gradually increasing along a direction from the air outlet to the air inlet for increasing a size of the each of the fan blades.
15. The electrical fan as claimed in claim 14 , wherein the hub has a shape of a hemisphere.
16. The electrical fan as claimed in claim 14 , wherein the hub has a shape of a truncated-cone.
17. The electrical fan as claimed in claim 14 , wherein the hub has a shape of a hemi-ellipsoid.