Apparatus and method for clamping turbine generator coil windings using bolted clamp

• US 6,373,165 B1
• Filed: 10/26/2000
• Issued: 04/16/2002
• Est. Priority Date: 10/26/2000
• Status: Active Grant

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Siemens Westinghouse Power Corporation
• Inventors: Rowe, Charles M.
• Primary Examiner(s): Mullins, Burton S.
• Application Number:
  US09/696,848
• Time in Patent Office: 537 Days
• Field of Search: 310/260, 310/194, 310/270, 310/42
• US Class Current: 310/260
• CPC Class Codes: H02K 3/505 for large machine windings, e.g. bar windings H02K3/51 takes precedence

Abstract

A clamping apparatus clamps opposing pairs of stator coil windings of a turbine generator and includes a retaining platform positioned adjacent one side and across a pair of coil windings having a space therebetween. A bore extends therethrough and is aligned with the space between the pair of coil windings. A connecting insert member is carried within the bore of the retaining platform and has a threaded through-hole aligned with the space between the pair of coil windings. A threaded rod extends through the space between the pair of coil windings and through the threaded through-hole of the connecting insert member. The threaded rod mates with the threaded through-hole such that the tension created in the threaded rod during tightening biases the retaining platform against the pair of coil windings.

Claims

1. A clamping apparatus useful for clamping opposing pair of stator coil windings of a turbine generator, the clamping apparatus comprising:

a retaining platform positioned adjacent one side and across a pair of coil windings having a space therebetween and having a bore extending therethrough that is aligned with the space between the pair of coil windings;

a connecting insert member carried within the bore of the retaining platform and having a threaded through-hole aligned with the space between the pair of coil windings; and

a threaded rod extending through the space between the pair of coil windings and through the threaded through-hole of the connecting insert member, wherein said threaded rod mates with the threaded through-hole such that the tension created in the threaded rod during tightening biases the retaining platform against the pair of coil windings.

2. A clamping apparatus according to claim 1, wherein the threaded rod is used with shims for increasing or decreasing tension within the threaded rod and increasing or decreasing biasing of the retaining platform against the pair of coil windings.

3. A clamping apparatus according to claim 2, wherein said threaded rod is formed of a material wherein the strength of the threads on the threaded rod is increased with increased tension.

4. A clamping apparatus according to claim 3, wherein said threaded rod is formed of fiberglass and resin.

5. A clamping apparatus according to claim 1, wherein said connecting insert member has a tapered cross-section adjustably secured within said bore of said retaining platform.

6. A clamping apparatus according to claim 1, and further comprising a support block for positioning between the retaining platform and across the pair of coil windings, said support block having an aperture therethrough for aligning with the space between the pair of coil windings and the bore of said retaining platform.

7. A clamping apparatus according to claim 1, wherein said connecting insert member comprises separable mating segments.

8. A clamping apparatus according to claim 7, wherein the separable mating segments comprise mating arcuate portions forming the through-hole.

9. A clamping apparatus according to claim 1, wherein said pair of coil windings are positioned parallel and in a spaced relation, thus having a space therebetween.

10. A clamping apparatus useful for clamping opposing pairs of stator coil windings of a turbine generator, the clamping apparatus comprising:

a first retaining platform positioned adjacent one side and across a first pair of coil windings having a space therebetween, said first retaining platform having a bore extending therethrough that is aligned with the space between the first pair of coil windings;

a second retaining platform positioned adjacent one side and across a second pair of coil windings having a space therebetween, said second retaining platform having a bore extending therethrough for aligning with the space of the second pair of coil windings, wherein the first and second pairs of coil windings are sandwiched between said first and second retaining platforms;

first and second connecting insert members, each respectively carried within each bore of said retaining platforms, each of said connecting insert portions having a threaded through-hole; and

a threaded rod passing through each of the spaces of each of the first and second pairs of coil windings and passing through the through-holes of the connecting insert members, wherein said threaded rod mates with each threaded through-hole such that the tension created in the threaded rod during tightening biases the retaining platforms against the pairs of coil windings.

11. A clamping apparatus according to claim 10, wherein the threaded rod is used with shims for increasing or decreasing tension within the threaded rod and increasing or decreasing biasing of the retaining platforms against the pairs of coil windings.

12. A clamping apparatus according to claim 10, wherein said threaded rod is formed of a material such that the strength of the threads on the threaded rod is increased with increased tension.

13. A clamping apparatus according to claim 12, wherein said threaded rod is formed of fiberglass and resin.

14. A clamping apparatus according to claim 10, wherein said connecting insert member has a tapered cross-section adjustably secured within said bore of said retaining platform.

15. A clamping apparatus according to claim 10, and further comprising a support block for positioning between the retaining platform and across the pair of coil windings, said support block having an aperture therethrough for aligning with the space between the pair of coil windings and the bore of said retaining platform.

16. A clamping apparatus according to claim 10, wherein said connecting insert member comprises separable mating segments.

17. A clamping apparatus according to claim 16, wherein the separable mating segments comprise mating arcuate portions forming the through-hole.

18. A clamping apparatus according to claim 10, wherein said first pair of coil windings are positioned parallel and in a spaced relation, thus having a space therebetween.

19. A clamping apparatus according to claim 10, wherein said second pair of coil windings are positioned parallel and in spaced relation, thus having a space therebetween, said second pair of coil windings opposing said first pair of coil windings with alignment of the spaces therebetween.

20. A method for clamping opposing pair of stator coil windings of a turbine generator comprising the steps of:

inserting a threaded rod through a space formed between a pair of coil windings and through a threaded through-hole of a connecting insert member that is received within a bore of a retaining platform positioned adjacent one side and across the pair of coil windings; and

tightening the threaded rod within the threaded through-hole for biasing the retaining platform against the pair of coil windings with shims.

21. A method according to claim 20, and further comprising the step of compressing the threads on the threaded rod by increasing the tension.