Ripple spring

• US 8,400,042 B2
• Filed: 06/20/2011
• Issued: 03/19/2013
• Est. Priority Date: 06/20/2011
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Xu, James Jun, Rozier, Elena, Stonehouse, Thomas Robert, Sowers, Lawrence Lee
• Primary Examiner(s): Nguyen, Tran N.
• Assistant Examiner(s): DESAI, NAISHADH N
• Application Number:
  US13/163,781
• Publication Number:
  US 20120319525A1
• Time in Patent Office: 638 Days
• Field of Search: 310/214, 310/215, 310/43
• US Class Current: 310/214
• CPC Class Codes: H02K 3/487 Slot-closing devices

Abstract

A ripple spring is provided having one or more layers laminated together, where the one or more layers form a symmetrical stack.

Claims

1. A ripple spring, the ripple spring having a length extending along a length axis and a width extending along a width axis, the length axis being substantially orthogonal to the width axis, the ripple spring including a substantially sinusoidally shaped surface having a wavelength extending along a wavelength axis, the sinusoidally shaped surface having one or more valleys extending along a valley axis, the valley axis substantially orthogonal to the wavelength axis, the ripple spring comprising:

one or more layers laminated together, the one or more layers forming a symmetrical stack, the one or more layers further comprising one or more bottom layers, one or more middle layers and one or more top layers;

the one or more bottom layers, the one or more middle layers and the one or more top layers formed substantially of unidirectional fibers;

wherein, the unidirectional fibers of the one or more bottom layers and the one or more top layers are oriented substantially along the wavelength axis; and

wherein, the unidirectional fibers of the one or more middle layers are oriented substantially along the valley axis.

2. The ripple spring of claim 1, wherein the one or more bottom layers, the one or more middle layers and the one or more top layers comprise a binder material, the binder material comprising one or combinations of:

epoxy, polyester, polyesterimide, polyamide-imide, epoxy-phenolic, epoxy-novolac resin, and epoxy-polyimide.

3. The ripple spring of claim 2, wherein the binder material comprises at least one or combinations of:

an electrically conductive material, and a thermally conductive material.

4. The ripple spring of claim 1, wherein the wavelength axis is parallel to the length axis.

5. The ripple spring of claim 1, wherein the wavelength axis is about forty five degrees from the length axis.

6. The ripple spring of claim 1, further in combination with:

an electric machine having a rotor and a stator, the stator having a stator core with a plurality of stator slots;

a plurality of stator bars contained substantially within the plurality of stator slots; and

wherein the ripple spring is located between at least one of the plurality of stator bars and the stator core.

7. The ripple spring of claim 1, further in combination with:

an electric machine having a rotor and a stator, the stator having a stator core with a plurality of stator slots;

a plurality of stator bars contained substantially within the plurality of stator slots; and

wherein the ripple spring is located between at least one of the plurality of stator bars and a stator wedge.

8. A ripple spring, the ripple spring having a length extending along a length axis and a width extending along a width axis, the length axis being substantially orthogonal to the width axis, the ripple spring including a substantially sinusoidally shaped surface having a wavelength extending along a wavelength axis, the sinusoidally shaped surface having one or more valleys extending along a valley axis, the valley axis substantially orthogonal to the wavelength axis, the ripple spring comprising:

one or more layers laminated together, the one or more layers forming a symmetrical stack, the one or more layers further comprising one or more bottom layers, one or more middle layers and one or more top layers;

the one or more bottom layers, the one or more middle layers and the one or more top layers formed substantially of unidirectional fibers;

wherein, the unidirectional fibers of the one or more bottom layers, the one or more middle layers and the one or more top layers are oriented substantially along the wavelength axis;

a first layer located between the one or more bottom layers and the one or more middle layers, the first layer formed substantially of unidirectional fibers, the unidirectional fibers of the first layer oriented substantially along the valley axis; and

a second layer located between the one or more middle layers and the one or more top layers, the second layer formed substantially of unidirectional fibers, the unidirectional fibers of the second layer oriented substantially along the valley axis.

9. The ripple spring of claim 8, wherein the one or more bottom layers, the first layer, the one or more middle layers, the second layer and the one or more top layers comprise a binder material, the binder material comprising one or combinations of:

epoxy, polyester, polyesterimide, polyamide-imide, epoxy-phenolic, epoxy-novolac resin, and epoxy-polyimide.

10. The ripple spring of claim 9, wherein the binder material comprises at least one or combinations of:

an electrically conductive material, and a thermally conductive material.

11. The ripple spring of claim 8, wherein the wavelength axis is parallel to the length axis.

12. The ripple spring of claim 8, wherein the wavelength axis is about forty five degrees from the length axis.

13. The ripple spring of claim 8, further in combination with:

an electric machine having a rotor and a stator, the stator having a stator core with a plurality of stator slots;

a plurality of stator bars contained substantially within the plurality of stator slots; and

wherein the ripple spring is located between at least one of the plurality of stator bars and the stator core.

14. The ripple spring of claim 8, further in combination with:

an electric machine having a rotor and a stator, the stator having a stator core with a plurality of stator slots;

a plurality of stator bars contained substantially within the plurality of stator slots; and

wherein the ripple spring is located between at least one of the plurality of stator bars and a stator wedge.

15. A ripple spring, the ripple spring having a length extending along a length axis and a width extending along a width axis, the length axis being substantially orthogonal to the width axis, the ripple spring including a substantially sinusoidally shaped surface having a wavelength extending along a wavelength axis, the sinusoidally shaped surface having one or more valleys extending along a valley axis, the valley axis substantially orthogonal to the wavelength axis, the ripple spring comprising:

one or more layers laminated together, the one or more layers forming a symmetrical stack, the one or more layers further comprising one or more bottom layers, one or more middle layers and one or more top layers;

the one or more bottom layers and the one or more top layers formed substantially of carbon fibers;

the one or more middle layers formed substantially of unidirectional fibers, the unidirectional fibers of the one or more middle layers oriented substantially along the valley axis;

a first layer located between the one or more bottom layers and the one or more middle layers, the first layer formed substantially of unidirectional fibers, the unidirectional fibers of the first layer oriented substantially along the wavelength axis; and

a second layer located between the one or more middle layers and the one or more top layers, the second layer formed substantially of unidirectional fibers, the unidirectional fibers of the second layer oriented substantially along the wavelength axis.

16. The ripple spring of claim 15, wherein the first layer, the one or more middle layers and the second layer comprise a binder material, the binder material comprising one or combinations of:

epoxy, polyester, polyesterimide, polyamide-imide, epoxy-phenolic, epoxy-novolac resin, and epoxy-polyimide.

17. The ripple spring of claim 16, wherein the binder material comprises at least one or combinations of:

an electrically conductive material, and a thermally conductive material.

18. The ripple spring of claim 15, wherein the wavelength axis is parallel to the length axis.

19. The ripple spring of claim 15, wherein the wavelength axis is about forty five degrees from the length axis.

20. The ripple spring of claim 15, further in combination with:

an electric machine having a rotor and a stator, the stator having a stator core with a plurality of stator slots;

a plurality of stator bars contained substantially within the plurality of stator slots; and

wherein the ripple spring is located between at least one of the plurality of stator bars and the stator core.

21. The ripple spring of claim 15, further in combination with:

an electric machine having a rotor and a stator, the stator having a stator core with a plurality of stator slots;

a plurality of stator bars contained substantially within the plurality of stator slots; and

wherein the ripple spring is located between at least one of the plurality of stator bars and a stator wedge.

22. A ripple spring, the ripple spring having a length extending along a length axis and a width extending along a width axis, the length axis being substantially orthogonal to the width axis, the ripple spring including a substantially sinusoidally shaped surface having a wavelength extending along a wavelength axis, the sinusoidally shaped surface having one or more valleys extending along a valley axis, the valley axis substantially orthogonal to the wavelength axis, the ripple spring comprising:

one or more layers laminated together, the one or more layers forming a symmetrical stack, the one or more layers further comprising one or more bottom layers, one or more middle layers and one or more top layers;

the one or more bottom layers and the one or more top layers formed substantially of unidirectional fibers, the unidirectional fibers of the one or more bottom layers and the one or more top layers oriented substantially along the wavelength axis;

the one or more middle layers formed substantially of carbon fibers;

a first layer located between the one or more bottom layers and the one or more middle layers, the first layer formed substantially of unidirectional fibers, the unidirectional fibers of the first layer oriented substantially along the valley axis; and

a second layer located between the one or more middle layers and the one or more top layers, the second layer formed substantially of unidirectional fibers, the unidirectional fibers of the second layer oriented substantially along the valley axis.

23. The ripple spring of claim 22, wherein the one or more bottom layers, the first layer, the second layer and the one or more top layers comprise a binder material, the binder material comprising one or combinations of:

epoxy, polyester, polyesterimide, polyamide-imide, epoxy-phenolic, epoxy-novolac resin, and epoxy-polyimide.

24. The ripple spring of claim 23, wherein the binder material comprises at least one or combinations of:

an electrically conductive material, and a thermally conductive material.

25. The ripple spring of claim 22, wherein the wavelength axis is parallel to the length axis.

26. The ripple spring of claim 22, wherein the wavelength axis is about forty five degrees from the length axis.

27. The ripple spring of claim 22, further in combination with:

an electric machine having a rotor and a stator, the stator having a stator core with a plurality of stator slots;

a plurality of stator bars contained substantially within the plurality of stator slots; and

wherein the ripple spring is located between at least one of the plurality of stator bars and the stator core.

28. The ripple spring of claim 22, further in combination with:

an electric machine having a rotor and a stator, the stator having a stator core with a plurality of stator slots;

a plurality of stator bars contained substantially within the plurality of stator slots; and

wherein the ripple spring is located between at least one of the plurality of stator bars and a stator wedge.