IP Library › Patent Application 14178832
Patent Application
App. No. 14/178,832

NOISE REDUCING FEATURES ON COOLING FAN

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Quick Facts
Patent No.
US None
App. No.
14/178,832
Abstract

A rotor arrangement for an electric machine includes a rotor shaft extending in an axial direction and a fan coupled to the rotor shaft. The fan includes a face with a plurality of arcuate walls extending from the face in the axial direction. Each of the plurality of arcuate walls includes a first end portion and a second end portion. A plurality of radial tines extend from the first end portion of each arcuate wall. A plurality of axial tines extending from the second end portion of each arcuate wall.

Claims (32)

1 . A rotor arrangement for an electric machine comprising:

a rotor shaft extending in an axial direction; and

a fan coupled to the rotor shaft, the fan including a face with a plurality of walls extending from the face in the axial direction, each of the plurality of walls including:

a first end portion and a second end portion; and

a plurality of axial tines extending from the second end portion.

2 . The rotor arrangement of claim 1 wherein the plurality of axial tines are positioned along an upper edge of each of the plurality of walls.

3 . The rotor arrangement of claim 2 wherein the plurality of axial tines are positioned in staggered rows along the upper edge of each of the plurality of walls.

4 . The rotor arrangement of claim 1 wherein the plurality of axial tines are positioned along a length of each wall following a step on the wall.

5 . The rotor arrangement of claim 4 wherein the plurality of axial tines extend from the step on the wall to an end of the wall.

6 . The rotor arrangement of claim 5 wherein the step is located at about a midpoint of the wall.

7 . The rotor arrangement of claim 6 wherein the plurality of axial tines are positioned along about half of each wall from the step on the wall to the end of the wall.

8 . The rotor arrangement of claim 4 wherein the length of each tine is about the same as a height of the step.

9 . The rotor arrangement of claim 1 wherein the plurality of axial tines are positioned along a length of each wall from a step on the wall to an end of the wall.

10 . The rotor arrangement of claim 9 wherein each of the walls is arcuate in shape and tapered in the axial direction.

11 . The rotor arrangement of claim 1 wherein the first end portion is closer to a hub of the fan than a perimeter of the fan.

12 . The rotor arrangement of claim 1 further comprising a plurality of radial tines extending from the first end portion of each of the plurality of walls.

13 . The rotor arrangement of claim 12 , the radial tines provided in two rows that extend from the first end portion of the wall.

14 . An electric machine comprising:

a field winding;

a plurality of claw-pole segments arranged around the field winding;

a rotor shaft coupled to the plurality of claw-pole segments, the rotor shaft defining a shaft axis about which the rotor shaft rotates; and

a fan coupled to the rotor shaft, the fan including a face with a plurality of walls extending from the face in an axial direction, each of the plurality of walls including:

a first end portion and a second end portion with a step between the first end portion and the second end portion; and

a plurality of axial tines extending from the second end portion, the plurality of axial tines positioned along a length of each wall following the step with a length of each axial tine about the same as a height of the step.

15 . The electric machine of claim 14 wherein the plurality of axial tines extend from the step on the wall to an end of the wall.

16 . The electric machine of claim 15 wherein the step is positioned at an approximate midpoint on the wall.

17 . The electric machine of claim 14 further comprising a plurality of radial tines extending from the first end portion of each of the plurality of walls, the plurality of radial tines extending in a direction substantially perpendicular to the plurality of axial tines.

18 . The electric machine of claim 17 wherein the length of each axial tine is about the same as the length of each radial tine.

19 . The electric machine of claim 18 wherein each of the plurality of walls is arcuate in shape and tapered in an axial direction.

20 . A rotor arrangement for an electric machine comprising:

a rotor shaft extending in an axial direction; and

a fan coupled to the rotor shaft, the fan including a main body portion with a plurality of walls extending from the main body portion in the axial direction, each of the plurality of walls including a plurality of tines extending from the wall, the tines positioned either (i) on an axial end of the wall and extending in the axial direction, or (ii) on a radial end of the wall and extending in a radial direction.