Rotor winding having a braze joint spaced apart from stress concentration

Patent metadata

Field	Value
Publication number	US-9455613-B2
Application number	US-201414325413-A
Country	US
Kind code	B2
Filing date	Jul 8, 2014
Priority date	Jul 23, 2013
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A winding for a rotor for use in an electrical generator utilized in the power generation industry. The winding includes a plurality of axial sections and a plurality of transversely oriented end arc sections. An integrated leg section extends from each end arc section to form an associated corner section at an intersection of each leg section and associated end arc section. Each leg section is affixed to an associated axial section at a joint that is spaced apart from an associated corner section such that the joint is not subjected to stress concentration which occurs at the associated corner section.

First claim

What is claimed is:

1. A winding for a rotor having a rotor body, comprising:
a plurality of first axial sections located in a first slot of the rotor body;
a plurality of second axial sections located in a second slot of the rotor body;
a plurality of end arc sections, wherein each end arc section is oriented transverse to an associated axial section; and
first and second integrated leg sections that extend from each end arc section to form associated first and second corner sections, respectively, wherein the first and second leg sections are affixed to associated first and second axial sections located in the first and second slots, respectively, at first and second joints, respectively, wherein the first and second joints are spaced apart from the first and second corner sections, respectively, by a distance such that the first and second joints are not subjected to stress concentration which occurs at the first and second corner sections, respectively, thereby connecting each end arc section between an associated first axial section in the first slot and an associated second axial section in the second slot.

2. The winding according to claim 1 , wherein the first and second joints are spaced apart from the associated corner section by a minimum distance sufficient to ensure that the first and second joints are not subjected to stress concentration from the corner section.

3. The winding according to claim 1 , wherein the first and second joints are formed by brazing.

4. The winding according to claim 1 , wherein the axial, end arc, and leg sections are fabricated from copper.

5. The winding according to claim 1 , wherein either the end arc sections or axial sections or both the end arc and axial sections each include a transition section.

6. The winding according to claim 1 , further including a radius at each corner section for reducing stress concentration.

7. The winding according to claim 1 , wherein each end arc includes a cooling channel.

8. A rotor for use in a generator, comprising:
a rotor body having a shaft;
a plurality of slots formed in the rotor body;
a plurality of axial sections located within each slot;
a plurality of end arc sections, wherein each end arc section is oriented transverse to an associated axial section;
first and second leg sections integrally formed with each end arc section wherein each leg section extends from each end arc section to form associated first and second corner sections, respectively, wherein the first and second leg sections are affixed to associated first and second axial sections located in first and second slots, respectively, at first and second joints, respectively, wherein the first and second joints are spaced apart from the first and second corner sections, respectively, by a distance such that the first and second joints are not subjected to stress concentration which occurs at the first and second corner sections, respectively, thereby connecting each end arc section between an associated first axial section in the first slot and an associated second axial section in the second slot.

9. The rotor according to claim 8 , wherein the first and second joints are spaced apart from the associated corner section by a minimum distance sufficient to ensure that the first and second joints are not subjected to stress concentration from the corner section.

10. The rotor according to claim 8 , wherein the first and second joints are formed by brazing.

11. The rotor according to claim 8 , wherein the axial, end arc and leg sections are fabricated from copper.

12. The rotor according to claim 8 , wherein either the end arc sections or axial sections or both the end arc and axial sections each include a transition section.

13. The rotor according to claim 8 , further including a radius at each corner section for reducing stress concentration.

14. The rotor according to claim 8 , wherein each end arc includes a cooling channel.

15. A method for forming a winding for a rotor having a rotor body, comprising:
providing a plurality of first axial sections located in a first slot of the rotor body;
a plurality of second axial sections located in a second slot of the rotor body;
providing a plurality of end arc sections, wherein each end arc section is oriented transverse to an associated axial section;
providing first and second integrated leg sections that extend from each end arc section to form associated first and second corner sections, respectively;
affixing the first and second leg sections to associated first and second axial sections located in the first and second slots, respectively, at first and second joints, respectively, thereby connecting each end arc section between an associated first axial section in the first slot and an associated second axial section in the second slot; and
locating the first and second joints at a position which is spaced apart in an axial direction by a distance from associated first and second corner sections, respectively, such that the first and second joints are not subjected to stress concentration which occurs at the associated first and second corner sections, respectively.

16. The method according to claim 15 , wherein the first and second joints are spaced apart from the associated corner section by a minimum distance sufficient to ensure that the first and second joints are not subjected to stress concentration from the corner section.

17. The method according to claim 15 , wherein the first and second joints are formed by brazing.

18. The method according to claim 15 , wherein the axial, end arc and leg sections are fabricated from copper.

19. The method according to claim 15 , wherein either the end arc sections or axial sections or both the end arc and axial sections each include a transition section.

20. The method according to claim 15 , further including a radius at each corner section for reducing stress concentration.

Assignees

• Siemens Energy Inc

Inventors

• Grobe Mark A
• Hulsey David Earl
• Johnson James V
• Lemke Robert F
• Ralph Robert W
• Schneider Christian T
• Soto Stephen T
• Whitener Randy Edward
• Zeller Larry L

Classifications

• Y10T29/49012

  Rotor · CPC title

• H02K3/12

  arranged in slots · CPC title

• H02K15/0414 Primary

  the windings consisting of separate elements, e.g. bars, segments or half coils · CPC title

• H02K3/24

  with channels or ducts for cooling medium between the conductors · CPC title

• H02K3/51

  applicable to rotors only · CPC title