Rotor wedges and layers and heat sinks

Patent metadata

Field	Value
Publication number	US-11081920-B2
Application number	US-201715721011-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Sep 29, 2017
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A wedge for a wound rotor includes a wedge body. The wedge body has a first layer and one or more second layers interfused with one another to provide structural support and limit resistive heating of the wedge from current flow within the wedge body by windings spaced apart by the rotor wedge. Generator rotors and methods of making generator rotors are also described.

First claim

What is claimed is:

1. A rotor wedge for a wound rotor, comprising:
a wedge body having a plurality of layers interfused with one another to provide structural support and limit resistive heating of the wedge caused by current flow within the wedge body by windings spaced apart by the rotor wedge, the rotor wedge further comprising an insulating layer deposited over first and second winding faces and an apex of the wedge body, wherein the insulating laver extends contiguously between opposite longitudinal ends of the wedge body, wherein the apex is between the two winding faces on a radially inner side of the wedge body.

2. The rotor wedge as recited in claim 1 , wherein the wedge body comprises titanium or titanium alloy.

3. The rotor wedge as recited in claim 1 , wherein the wedge body has at least one channel extending between longitudinally opposite ends of the wedge body.

4. The rotor wedge as recited in claim 1 , wherein the insulating layer comprises a polymeric material.

5. The rotor wedge as recited in claim 1 , further comprising a heat sink fixed to a longitudinal end of the wedge body, wherein the fins face inward.

6. The wedge as recited in claim 5 , wherein the heat sink includes a material having higher thermal conductivity than a material forming the wedge body.

7. The rotor wedge as recited in claim 5 , wherein the heat sink includes aluminum or aluminum alloy.

8. The rotor wedge as recited in claim 5 , wherein the heat sink includes a finned body longitudinally spaced apart from the wedge body.

9. The rotor wedge as recited in claim 1 , wherein the wedge body has a longitudinal profile, the longitudinal profile having a generally polygonal or triangular shape with a stator face, an apex opposite the stator face, and first and second winding faces spanning the apex and the stator face on laterally opposite sides of wedge body.

10. The rotor wedge as recited in claim 9 , wherein the wedge body has a major channel and a pair of minor channels, the major channel arranged laterally between the apex and the stator face of the wedge body, a first of the minor channels arranged laterally between the major channel and the first winding face, a second of the minor channels arranged laterally between the major channel and the second winding face of the wedge body.

11. The rotor wedge body as recited in claim 9 , wherein the wedge body includes one or more cooling channels defined within the stator face and extending longitudinally along the wedge body.

12. The rotor wedge as recited in claim 9 , further comprising a heat transfer plate coupled to stator face of the wedge body and extending along a longitudinal length of the wedge body.

13. The rotor wedge as recited in claim 12 , wherein the heat transfer plate includes a material having higher thermal conductivity than a material forming the wedge body, wherein the heat transfer plate is on a radially outward stator face of the wedge body.

14. The rotor wedge as recited in claim 12 , wherein the heat transfer plate includes aluminum or an aluminum alloy.

15. A wound rotor for a synchronous machine generator, comprising:
a rotor body supported for rotation along a rotation axis and having a winding slot;
first and second windings seated in the winding slot, the second winding offset circumferentially from the first winding; and;
a rotor wedge seated in winding slot between the first winding and the second winding, the first winding abutting a first winding face of the wedge body, the second winding abutting a second winding face of the wedge body arranged of a circumferentially opposite the first winding face, and the wedge body electrically isolating the first winding from the second winding, the rotor wedge further comprising an insulating layer deposited over first and second winding faces and an apex of the wedge body, wherein the insulating layer extends contiguously between opposite longitudinal ends of the wedge body, wherein the apex is between the two winding faces on a radially inner side of the wedge body.

16. The wound rotor as recited in claim 15 , wherein the second winding is electrically isolated from the first winding by the wedge body and further comprising an insulating layer, wherein the insulating layer is deposited over the winding faces and the apex of the wedge body, wherein the insulating layer extends contiguously between opposite longitudinal end of the stator face of the wedge body.

17. The wound rotor as recited in claim 15 , wherein the wedge body comprises titanium or a titanium alloy, wherein the wedge body has at least one channel extending between longitudinally opposite ends of the wedge body, and further comprising a heat transfer plate coupled to the stator face of the wedge body and extending longitudinally along at least a portion of the wedge body, wherein the heat transfer plate comprises aluminum or an aluminum alloy.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Pal Debabrata
• Joshi Ashutosh

Classifications

• H02K9/227

  Heat sinks · CPC title

• H02K1/32 Primary

  with channels or ducts for flow of cooling medium · CPC title

• H02K1/28

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title

• H02K3/527

  applicable to rotors only · CPC title

• H02K19/16

  Synchronous generators · CPC title