The patent application discloses a rotor for a motor. The rotor may comprise a shaft body, a shaft, a rotor magnet, and a plurality of air holes. The shaft body may have a first end, a second end, and a cylindrical body between the first end and the second end. The shaft may extend along a central axis of the shaft body. The rotor magnet on a magnetic slot inside the cylindrical body may be configured to rotate together with the shaft. The plurality of air holes on the first end of the shaft body may run through the cylindrical body and end in the second end of the shaft body.
1 . A rotor for a motor, comprising:
a shaft body having a first end, a second end, and a cylindrical body between the first end and the second end;
a shaft extending along a central axis of the shaft body;
a rotor magnet on a magnetic slot inside the cylindrical body configured to rotate together with the shaft;
a plurality of raised ribs with each rib connecting to the shaft at one end, radially extending out to an outer cylindrical surface of the cylindrical body at the other end, wherein the plurality of raised ribs divide the outer cylindrical surface into a plurality of areas; and
a plurality of air holes on the first end of the shaft body running through the cylindrical body and end in the second end of the shaft body, wherein the plurality of air holes have each opening on each of the plurality of areas of the outer cylindrical surface between the plurality of raised ribs, wherein the plurality of air holes are fan-like shapes, wherein the fan-like shape of each of the plurality of air holes is defined by two adjacent raised ribs as lateral boundaries, such that each air hole widens from a narrower portion adjacent to the shaft to a wider portion at the outer cylindrical surface in correspondence with the diverging spacing between adjacent radially-extending ribs.
2 . The rotor of claim 1 , wherein the plurality of air holes run parallel to the central axis of the shaft body.
3 . The rotor of claim 1 , wherein the plurality of air holes are arranged around the shaft on the first end and the second end of the shaft body symmetrically.
4 . The rotor of claim 1 , wherein the number of magnetic slots are six, nine, or twelve.
5 . The rotor of claim 1 , further comprising a fan attached to the shaft of the shaft body.
6 . The rotor of claim 5 , wherein the fan has a plurality of blades arranged in a circumferential direction.
7 . The rotor of claim 1 further comprising the plurality of raised ribs attached to the cylindrical body on the first end in a circumferential direction.
8 . The rotor of claim 1 further comprising the plurality of raised ribs attached to the cylindrical body on the second end in a circumferential direction.
9 . A rotor for a motor, comprising:
a shaft body having a first end, a second end, and a cylindrical body between the first end and the second end; a plurality of raised ribs with each rib connected to the shaft at one end, radially extending out to an outer cylindrical surface of the cylindrical body at the other end, wherein the plurality of raised ribs divide the outer cylindrical surface into a plurality of areas; and
a plurality of air holes on the first end of the shaft body running through the cylindrical body and end in the second end of the shaft body, wherein the plurality of air holes are parallel to a central axis of the shaft body, wherein the plurality of air holes have each opening on each of the plurality of areas of the outer cylindrical surface between the plurality of raised ribs, wherein the plurality of air holes are fan-like shapes, wherein each of the plurality of fan-like shaped air holes is laterally bounded by two adjacent radially-extending raised ribs, the fan-like shape of each air hole corresponding to the sector-shaped space defined between two adjacent radially-extending ribs on the outer cylindrical surface of the cylindrical body.
10 . The rotor of claim 9 , further comprising a shaft extending along the central axis.
11 . The rotor of claim 10 , further comprising a rotor magnet on a magnetic slot inside the cylindrical body configured to rotate together with the shaft.
12 . The rotor of claim 10 , wherein the plurality of air holes are arranged around the shaft on the first end and the second end of the shaft body symmetrically.
13 . The rotor of claim 12 , wherein the number of magnetic slots are six, nine, or twelve.
14 . The rotor of claim 10 , further comprising a fan attached to the shaft of the shaft body.
15 . The rotor of claim 14 , wherein the fan has a plurality of blades arranged in a circumferential direction.
16 . The rotor of claim 9 further comprising the plurality of raised ribs attached to the cylindrical body on the first end in a circumferential direction.
17 . The rotor of claim 9 further comprising the plurality of raised ribs attached to the cylindrical body on the second end in a circumferential direction.
18 . A rotor of a motor, comprising:
a bearing portion;
a shaft body having a shaft extending along a central axis, and rotatably supported by the bearing portion; a plurality of raised ribs with each rib connected to the shaft at one end, radially extending out to an outer cylindrical surface of the cylindrical body at the other end, wherein the plurality of raised ribs divide the outer cylindrical surface into a plurality of areas; and
a plurality of air holes inside the shaft body, wherein the plurality of air holes are parallel to the central axis of the shaft body, wherein the plurality of air holes have each opening on each of the plurality of areas of the outer cylindrical surface between the plurality of raised ribs, wherein the plurality of air holes are fan-like shapes, wherein each of the plurality of fan-like shaped air holes corresponds to a sector-shaped space between two adjacent radially-extending ribs, each sector-shaped space being wider at the outer cylindrical surface than at the shaft, and wherein adjacent fan-like shaped air holes are separated from each other by the radially-extending raised ribs.
19 . The rotor of claim 18 further comprising a fan attached to the shaft of the shaft body.
20 . The rotor of claim 19 wherein the fan includes a plurality of blades arranged in a circumferential direction.