Compression of resin impregnated insulating tapes

• US 7,553,438 B2
• Filed: 04/15/2005
• Issued: 06/30/2009
• Est. Priority Date: 06/15/2004
• Status: Active Grant

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Siemens Energy Incorporated (Siemens AG)
• Inventors: Lutz, Andreas, Smith, James D, Stevens, Gary, Wood, John W
• Primary Examiner(s): DYE, ROBERT C
• Application Number:
  US11/106,845
• Publication Number:
  US 20050274450A1
• Time in Patent Office: 1,537 Days
• Field of Search: 264/272.19, 264/272.2, 156/53
• US Class Current: 264/257
• CPC Class Codes: C08J 5/04 Reinforcing macromolecular compounds with loose or coherent fibrous material
• CPC Class Codes: H01B 3/12 ceramics

Abstract

The present invention provides for a method of impregnating a matrix with a high thermal conductivity filled resin 32, which produces a resin impregnated matrix. The high thermal conductivity material 30 comprises 5-60% by volume of the resin 32. This is compressed by approximately 5-30%, and the distances between the high thermal conductivity materials loaded in the resin are reduced, and the resin is then cured.

Claims

1. A method of impregnating a matrix comprising:

impregnating said matrix with a high thermal conductivity material loaded resin, wherein high thermal conductivity materials of said resin comprise 5-60% by volume of said resin, to produce a resin impregnated matrix;

after said impregnating, but prior to curing said resin impregnated matrix compressing said resin impregnated matrix by approximately 5-30%, wherein said compressing is effective to provide a network of said high thermal conductivity materials having reduced distances between said high thermal conductivity materials loaded in said resin; and

curing said resin impregnated matrix to effectively lock a position of said network of said high thermal conductivity materials in place;

wherein said high thermal conductivity materials comprise at least one of silica, alumina, magnesium oxide, silicon carbide, boron nitride, aluminum nitride, zinc oxide and diamonds and dendrimers of approximately 1-1000 nm in size, and wherein said high thermal conductivity materials have aspect ratios of 10-50.

2. The method of claim 1, wherein the distances between said high thermal conductivity materials loaded in said resin are approximately 5-50 nm.

3. The method of claim 1, wherein said resin impregnated matrix is compressed in a first compression, and thereafter is allowed to relax to 5-50% of the first compression.

4. A method of impregnating an insulating tape used with an electrically conducting object with a high thermal conductivity material loaded resin comprising:

impregnating said tape with the high thermal conductivity material loaded resin, wherein phonons passing through said resin have a mean phonon path length;

after said impregnating, but prior to curing said resin, compressing said tape impregnated with said resin, wherein said compressing comprises reducing the spacing between high thermal conductivity materials within said resin to an average distance below that of said mean phonon path length; and

curing said resin, wherein said curing is effective to lock a position of said high thermal conductivity materials with said reduced spacing in place;

wherein said high thermal conductivity materials comprise at least one of silica, alumina, magnesium oxide, silicon carbide, boron nitride, aluminum nitride, zinc oxide and diamonds and dendrimers of approximately 1-1000 nm in size; and

wherein said high thermal conductivity materials comprise 5-60% by volume of said resin.

5. The method of claim 4, wherein said tape is impregnated with said resin prior to being lapped about said electrically conducting object.

6. The method of claim 4, wherein said tape is impregnated with said resin after being lapped about said electrically conducting object.

7. The method of claim 6, wherein said impregnation is performed by at least one of vacuum-pressure impregnation (VPI) and global vacuum-pressure impregnation (GVPI).

8. The method of claim 4, wherein said high thermal conductivity material comprises 25-40% by volume of said resin.

9. The method of claim 4, wherein said mean phonon path length is 2-100 nm.

10. The method of claim 4, wherein said high thermal conductivity materials have an aspect ration of 3-100.

11. The method of claim 4, wherein said high thermal conductivity materials are from 10 nm to 100 microns in length.

12. The method of claim 4, wherein high thermal conductivity materials are added to said tape prior to said resin being impregnated.

13. A method of adding high thermal conductivity materials to an insulating medium comprising:

adding said high thermal conductivity materials that comprise at least one of silica, alumina, magnesium oxide, silicon carbide, boron nitride, aluminum nitride, zinc oxide and diamonds and dendrimers of approximately 1-1000 nm in size, to said insulating medium, wherein phonons passing through said insulating medium have a mean phonon oath length;

impregnating said insulating medium with a resin;

after said impregnating and prior to curing said resin, compressing said insulating medium approximately 5-30%, wherein said compressing said insulating medium reduces the spacing between said high thermal conductivity materials within said insulating medium to an average distance below that of said mean phonon path length; and

curing said resin, wherein said curing is effective to lock a position of said high thermal conductivity materials with said reduced spacing in place.

14. The method of claim 13, wherein said resin is further filled with high thermal conductivity materials.

15. The method of claim 13, wherein said insulating medium is additionally compressed after said thermal conductivity materials are added and before said resin is impregnated.

16. The method of claim 15, wherein the total amount of compression for the two compressions is approximately 10-30%.

17. The method of claim 13, wherein said insulating medium is a tape, wherein said impregnating is performed by at least one of vacuum-pressure impregnation (VPI) and global vacuum-pressure impregnation (GVPI).

18. The method of claim 13, wherein said high thermal conductivity materials have an aspect ration of 3-100.

19. The method of claim 13, wherein said high thermal conductivity materials are from 10 nm to 100 microns in length.

20. The method of claim 13, wherein said insulating medium is compressed prior to the impregnation of the resin.