A fan device includes a rotor 20 and recesses 40 to be filled with claylike weights 70 . The rotor 20 includes an impeller 23 and a shaft 10 . The impeller 23 has a hub 21 and vanes 22 . The recesses 40 are provided on a surface 212 that crosses an axial direction of the hub 21 . Each recess 40 has a first area 41 and a second area 42 . The first area 41 is circumferentially arranged and extends in a substantially circumferential direction. The second area 42 is connected to an outer circumferential side of the first area 41 and has a shorter length in the circumferential direction than the first area 41 . The weight 70 is closely adhered to wall surfaces 421 and 422 formed along a radial direction in the second area 42 so as to prevent separation thereof.
1. A fan device comprising:
an impeller having a hub and vanes which are provided at an outer circumferential portion of the hub;
a shaft being provided at a center of the hub; and
a rotor including the impeller and the shaft and being supported so as to be rotatable around the shaft,
wherein the rotor is provided with plural recesses having a bottom, each of the plural recesses having a closed boundary, at least one of the plural recesses has a first area and at least one second area, the first area is located on a circumference having the shaft as a center and extends in a substantially circumferential direction, the second area is connected to the first area and has a shorter length in the circumferential direction than the first area, and
wherein the first area and the second area are opened to an exposed surface of the rotor,
wherein a balance weight is adhered to at least one of the plural recesses, the balance weight includes a second portion filling the second area and a first portion which is connected to the second portion and extends in the circumferential direction in the first area, and
wherein the balance weight is a curable resin.
2. The fan device according to claim 1 , wherein the plural recesses are formed on a surface that crosses an axial direction of the rotor.
3. The fan device according to claim 2 , wherein the plural recesses are formed on an upper end surface of the hub.
4. The fan device according to claim 2 , wherein the plural recesses are formed on a lowermost exposed end surface of the hub.
5. The fan device according to claim 2 , wherein the plural recesses are formed on an outer surface of the hub inclined in relation to the axial direction.
6. The fan device according to claim 1 , wherein the plural recesses are formed on a surface that is parallel to an axial direction of the rotor.
7. The fan device according to claim 6 , wherein the plural recesses formed on an inner surface of the hub.
8. The fan device according to claim 1 , wherein the curable resin is a thermosetting resin or a two part compound epoxy resin.
9. The fan device according to claim 1 , wherein the second area is approximately perpendicular to the first area.
10. A fan device comprising:
an impeller having a hub and vanes which are provided at an outer circumferential portion of the hub;
a shaft being provided at a center of the hub; and
a rotor including the impeller and the shaft and being supported so as to be rotatable around the shaft, wherein
the rotor is provided with a recess having a bottom, the recess is formed by a single annular first area and a plurality of second areas protruding radially from the outer circumferential side of the single annular first area,
a balance weight is adhered to the recess,
the balance weight includes a second portion filling at least one of the plurality of second areas and a first portion which is connected to the second portion and extends in the circumferential direction in the first area, and
the balance weight is a curable resin.