Bolted connector for stator coils of an electrical generator

• US 8,981,606 B2
• Filed: 05/18/2012
• Issued: 03/17/2015
• Est. Priority Date: 05/18/2012
• Status: Active Grant

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Siemens Energy Incorporated (Siemens AG)
• Inventors: Vitello, Travis J., Jaluthariya, Mukesh Kumar
• Primary Examiner(s): Andrews, Michael
• Application Number:
  US13/474,888
• Publication Number:
  US 20130307359A1
• Time in Patent Office: 1,033 Days
• Field of Search: 310/71, 310/197, 310/201, 310/204, 310/260
• US Class Current: 310/71
• CPC Class Codes: H02K 3/505 for large machine windings, e.g. bar windings H02K3/51 takes precedence

Abstract

A connector assembly that mechanically and electrically connects respective ends of first and second stator coil sections includes first and second clip assemblies, first and second connector bar assemblies, and first and second coupling structures. The first clip assembly includes first and second clip members and the second clip includes third and fourth clip members. The first and second connector bar assemblies are coupled to the first and third clip members and to the second and fourth clip members, respectively, to structurally couple the first stator coil section to the second stator coil section. The first clip member, the first connector bar assembly, and the third clip member create a first path for electric current between the stator coil sections, and the second clip member, the second connector bar assembly, and the fourth clip member create a second path for electric current between the stator coil sections.

Claims

1. A connector assembly for mechanically and electrically connecting respective ends of first and second stator coil sections that are spaced apart from one another in a first direction comprising:

a first clip assembly affixed to the end of the first stator coil section, the first clip assembly comprising first and second clip members spaced apart from one another in a second direction transverse to the first direction so as to be electrically isolated from one another;

a second clip assembly affixed to the end of the second stator coil section, the second clip assembly comprising third and fourth clip members spaced apart from one another in the second direction so as to be electrically isolated from one another and spaced apart from the first and second clip members in the first direction;

a first connector bar assembly extending in the first direction and coupled to the first and third clip members to structurally couple the first stator coil section to the second stator coil section;

a second connector bar assembly extending in the first direction and coupled to the second and fourth clip members to structurally couple the first stator coil section to the second stator coil section, the first and second connector bar assemblies being spaced apart from one another in the second direction so as to be electrically isolated from one another;

first coupling structure that extends through openings in the first and second clip members and the first and second connector bar assemblies to couple the first clip member to the first connector bar assembly and to couple the second clip member to the second connector bar assembly, the first coupling structure being electrically isolated from the first and second clip members and from the first and second connector bar assemblies; and

second coupling structure that extends through openings in the third and fourth clip members and the first and second connector bar assemblies to couple the third clip member to the first connector bar assembly and to couple the fourth clip member to the second connector bar assembly, the second coupling structure being electrically isolated from the third and fourth clip members and from the first and second connector bar assemblies;

wherein;

the first clip member, the first connector bar assembly, and the third clip member create a first path for electric current between the first and second stator coil sections;

the second clip member, the second connector bar assembly, and the fourth clip member create a second path for electric current between the first and second stator coil sections; and

the first and second paths are electrically isolated from one another.

2. The connector assembly of claim 1, wherein the first and second coupling structures comprise first and second bolts having insulative sleeves disposed therearound to electrically isolate the bolts from the clip members and the connector bar assemblies.

3. The connector assembly of claim 2, wherein the first and second coupling structures further comprise first and second clamping assemblies, each clamping assembly affixed to opposite end portions of the bolts, the clamping assemblies applying compressive forces in the second direction to urge the clip members into engagement with the respective connector bar assemblies.

4. The connector assembly of claim 3, wherein each clamping assembly comprises:

an insulating washer that engages the respective connector bar assembly;

a nut threaded on the respective bolt end portion for providing compressive forces; and

a Belleville washer disposed between the insulating washer and the nut.

5. The connector assembly of claim 3, further comprising first and second spacer assemblies disposed about the respective first and second bolts between and engaged with the respective first and second connector bar assemblies, the spacer assemblies providing a counteracting force in the second direction against the compressive forces applied by the first and second clamping assemblies.

6. The connector assembly of claim 1, wherein the first and second connector bar assemblies each comprise first and second connector bars that are spaced apart from one another in the second direction, wherein the first and second connector bars of the first connector bar assembly sandwich the first and third clip members therebetween and the first and second connector bars of the second connector bar assembly sandwich the second and fourth clip members therebetween.

7. The connector assembly of claim 1, wherein gaps are formed between the first and second clip members and the third and fourth clip members, the gaps providing access to cooling tubes in the first and second stator coil sections that receive cooling fluid for cooling the first and second stator coil sections.

8. A connector assembly for mechanically and electrically connecting respective ends of first and second radially spaced apart stator coil sections comprising:

a first clip assembly affixed to the end of the first stator coil section;

a second clip assembly affixed to the end of the second stator coil section and being radially spaced apart from the first clip assembly; and

at least one connector bar assembly extending in the radial direction and coupled to the first and second clip assemblies so as to mechanically and electrically couple the first stator coil section to the second stator coil section, the at least one connector bar assembly capable of accommodating axial, radial, and circumferential misalignment between the ends of the first and second stator coil sections, wherein the at least one connector bar assembly is coupled to the first and second clip assemblies by first and second radially spaced apart bolts that pass through respective openings formed in the at least one connector bar assembly and the first and second clip assemblies, at least one of the openings being oversized in the radial direction such that the radial location of the coupling between the at least one connector bar assembly and at least one of the first and second clip assemblies can be adjusted to accommodate radial misalignment between the ends of the first and second stator coil sections.

9. The connector assembly of claim 8, wherein the at least one connector bar assembly is pivotably coupled to the first and second clip assemblies in the axial direction to accommodate axial misalignment between the ends of the first and second stator coil sections.

10. The connector assembly of claim 8, wherein the at least one connector bar assembly is capable of being obstinately bent in the circumferential direction to accommodate circumferential misalignment between the ends of the first and second stator coil sections.

11. The connector assembly of claim 8, wherein the at least one connector bar assembly is selected from a group of connector bar assemblies having differing amounts of circumferential bending, the selected connector bar assembly having an amount of circumferential bending generally corresponding to an amount of circumferential misalignment between the ends of the first and second stator coil sections.

12. A connector assembly for mechanically and electrically connecting respective ends of first and second stator coil sections that are radially spaced apart from one another comprising:

a first clip assembly affixed to the end of the first stator coil section, the first clip assembly comprising first and second clip members circumferentially spaced apart from one another so as to be electrically isolated from one another;

a second clip assembly affixed to the end of the second stator coil section, the second clip assembly comprising third and fourth clip members radially spaced apart from the first and second clip members and circumferentially spaced apart from one another so as to be electrically isolated from one another;

a first radially extending connector bar assembly coupled to the first and third clip members to structurally couple the first stator coil section to the second stator coil section;

a second radially extending connector bar assembly coupled to the second and fourth clip members to structurally couple the first stator coil section to the second stator coil section, the first and second connector bar assemblies being circumferentially spaced apart from one another so as to be electrically isolated from one another;

first coupling structure that extends through openings in the first and second clip members and the first and second connector bar assemblies to couple the first clip member to the first connector bar assembly and to couple the second clip member to the second connector bar assembly, the first coupling structure being electrically isolated from the first and second clip members and from the first and second connector bar assemblies; and

second coupling structure that extends through openings in the third and fourth clip members and the first and second connector bar assemblies to couple the third clip member to the first connector bar assembly and to couple the fourth clip member to the second connector bar assembly, the second coupling structure being electrically isolated from the third and fourth clip members and from the first and second connector bar assemblies;

wherein;

the first clip member, the first connector bar assembly, and the third clip member create a first path for electric current between the first and second stator coil sections;

the second clip member, the second connector bar assembly, and the fourth clip member create a second path for electric current between the first and second stator coil sections;

the first and second paths are electrically isolated from one another; and

the connector bar assemblies are capable of accommodating axial, radial, and circumferential misalignment between the ends of the first and second stator coil sections.

13. The connector assembly of claim 12, wherein:

the connector bar assemblies are pivotably coupled to each of the clip members in the axial direction to accommodate axial misalignment between the ends of the first and second stator coil sections;

the connector bar assemblies are each adjustably coupled to at least one of the clip members in the radial direction to accommodate radial misalignment between the ends of the first and second stator coil sections; and

at least one of;

the connector bar assemblies are capable of being obstinately bent in the circumferential direction to accommodate circumferential misalignment between the ends of the first and second stator coil sections; and

the connector bar assemblies are selected from a group of connector bar assemblies having differing amounts of circumferential bending, each selected connector bar assembly having an amount of circumferential bending generally corresponding to an amount of circumferential misalignment between the ends of the first and second stator coil sections.

14. The connector assembly of claim 13, wherein the openings in at least one of the first and third clip members and at least one of the second and fourth clip members are oversized in the radial direction such that the radial location of the coupling between the connector bar assemblies and the clip members with the radially oversized openings can be adjusted to accommodate radial misalignment between the ends of the first and second stator coil sections.

15. The connector assembly of claim 12, wherein the first and second coupling structures comprise:

first and second bolts having insulative sleeves disposed therearound to electrically isolate the bolts from the clip members and the connector bar assemblies; and

first and second clamping assemblies, each clamping assembly affixed to opposite end portions of the bolts, the clamping assemblies applying compressive forces in the circumferential direction to urge the clip members into engagement with the respective connector bar assemblies.

16. The connector assembly of claim 15, wherein each clamping assembly comprises:

an insulating washer that engages the respective connector bar assembly;

a nut threaded on the respective bolt end portion for providing compressive forces; and

a Belleville washer disposed between the insulating washer and the nut.

17. The connector assembly of claim 15, further comprising first and second spacer assemblies disposed about the respective first and second bolts between and engaged with the respective first and second connector bar assemblies, the spacer assemblies providing a counteracting force in the circumferential direction against the compressive forces applied by the first and second clamping assemblies.

18. The connector assembly of claim 12, wherein gaps are formed between the first and second clip members and the third and fourth clip members, the gaps providing access to cooling tubes in the first and second stator coil sections that receive cooling fluid for cooling the first and second stator coil sections.