Stator end-winding system and a retrofitting set for same

• US 5,355,046 A
• Filed: 04/27/1992
• Issued: 10/11/1994
• Est. Priority Date: 12/15/1989
• Status: Expired due to Term

• Current Assignee: Klaus Weigelt
• Original Assignee: Klaus Weigelt
• Inventors: Weigelt, Klaus
• Primary Examiner(s): SKUDY, ROBERT
• Application Number:
  US07/874,601
• Time in Patent Office: 897 Days
• Field of Search: 310/260, 310/271, 310/42, 310/43, 310/45, 310/254, 310/270, 310/179, 310/64, 310/214, 336/197
• US Class Current: 310/260
• CPC Class Codes: H02K 15/0006 Disassembling, repairing or modifying dynamo-electric machines repairing of cooling fluid boxes H02K15/0093
• CPC Class Codes: H02K 3/505 for large machine windings, e.g. bar windings H02K3/51 takes precedence
• CPC Class Codes: Y10S 174/20 Stator

Abstract

A stator end-winding system is proposed in which the bars of the winding are bent outwards and describe a hollow cone. The supporting proceeds by a wedge-like braced inside ring, a segmented outside ring and supports which also have a wedging effect. The bracing of the inside ring and outside ring is made by tie rods, the outside ring is azimuthally tensionable. Therefore, it can be placed over mentioned cone described by the bars without the necessity of disassembling the stator end-winding system.

Claims

1. An end-winding system of a stator of an electric machine having a hollow conical-shaped array of bars arranged coaxially about an axis of the machine and expanding outwardly at its end areas to define said hollow conical shape and having a support means including an inside ring having a conical-shaped outer surface extending along a predominant axial portion of an inner surface of said conical-shaped array of bars to provide an inner supporting surface area for said bars of a length at least equal to a length of said predominant axial portion, said support means including means urging said inside ring in an axial direction to urge said conical-shaped outer surface firmly against said array of bars which expands in a manner to define said hollow conical-shape;

and an outer support system engaging an outer surface of said array of bars and being removable and replaceable without the need to disassemble said array of bars, coupling means for urging said outer support system towards the conical surface of said inside ring for clamping said array of bars between said outer support system and said inside ring, and resilient means arranged between said outer support system and said stator to enable a common axial displacement of said array of bars, said outside support system and said inside ring against a retaining force of said resilient means, said inside ring urging said outside support system against said resilient means through means coupling said outside ring to said inside ring.

2. The end-winding system of claim 1, said outer support system including at least one segmented ring surrounding said array of bars.

3. The end-winding system of claim 2, said segmented ring including tensioning means extending substantially in an azimuthal direction between respective segments of said segmented ring.

4. The system of claim 2, where in said segmented ring is radially urged towards said inside ring by tensioning means.

5. The system of claim 1, wherein said coupling means further comprise tensioning means for urging said outside support system towards said inside ring, said tensioning means extending in a substantially radial direction between said outside support system and said inside ring.

6. The stator end-winding system of claim 1, wherein said outer support system includes at least one outside ring and wherein said coupling means further comprises tie rod means coupled to said one outside ring to urge said outer support system towards said inside ring, said tie rod means including azimuthally tensionable tie rods.

7. The system of claim 1, wherein said outer support system defines a conical surface acting upon said outer surface of said array of bars.

8. The system of claim 1, wherein said inside ring comprises at least two cone-shaped sections arranged axially in an end-to-end relation.

9. The system of claim 1, wherein said outer support system is mounted to said stator by connectors being substantially stiffer in a radial and in an azimuthal direction than in an axial direction.

10. The system of claim 1, wherein said outer support system is mounted to said stator by connectors having spring members applying an axial force to said outer support system.

11. The system of claim 1, wherein said outer support system is mounted to said stator by means which comprise connectors having slidable brace members cooperating with wedge shaped members for adjusting a force applied by the outer support system to said array of bars.

12. The system of claim 1, wherein the bars of said array, said inside ring and said outer support system are padded.

13. The system of claim 1, further comprising cords bracing said bars of said array near an outer end thereof for maintaining the bars in a given position.

14. The system of claim 1, wherein a central portion of said inside ring is provided with a gas guiding channel to guide a cooling gas flow axially into said electric machine.

15. The system of claim 1, wherein said outer support system comprises at least one continuous outside ring providing a conical-shaped surface for supporting said array of bars.

16. The system of claim 15, wherein said continuous outside ring is made of one piece and has an inner diameter larger than a maximum diameter of said conical-shaped array of bars.

17. An end-winding system of a stator of an electric machine having a hollow conical-shaped array of bars expanding coaxially about an axis of the machine at its end areas to define said hollow conical shape and having a support means including an inside ring having a conical-shaped outer surface extending along a predominant axial portion of an inner surface of said conical-shaped array of bars to provide an inner supporting surface area for said bars coextensive with the predominant axial portion of the inner surface of said array of bars, said support means further including means urging said inside ring in an axial direction to urge said conical-shaped outer surface firmly against said array of bars which expands in a manner to define a hollow conical-shape;

and an outer support system engaging an outer surface of said array of bars and being removable and replaceable without a need to disassemble said array of bars, coupling means urging said outer support system towards said inside ring for clamping said array of bars between said outer support system and said inside ring, and resilient means urging said outer support system toward said array and enabling a common axial displacement of said array, said outer support system and said inside ring said outer support system including adjustable sliding wedge means coupled between said stator and said bars of said array and slidable along stationary wedge means engaging said array of bars along a substantial longitudinal portion thereof for adjusting a force applied by said stationary wedge means towards said inside ring.

18. The system of claim 17 wherein said adjustable sliding wedge means further comprises wedge members slidable along said outer support system and being urged toward one another to cause said outer support system to be urged toward said bars.

19. An end-winding system of a stator of an electric machine having a hollow conical-shaped array of bars expanding coaxially about an axis of the machine at its end areas to define said hollow conical shape and having a support means including an inside ring having a conical-shaped outer surface extending along a predominant axial portion of an inner surface of said conical-shaped array of bars to provide an inner supporting surface area for said bars, coextensive with the inner surface along said predominant axial portion, said means urging said inside ring in an axial direction to urge its conical-shaped outer surface firmly against said array of bars which expands in a manner to define said hollow conical-shape;

and an outer support system engaging an outer surface of said array of bars and being removable and replaceable without a need to disassemble said array of bars, coupling means urging said outer support system towards said inside ring for clamping said array of bars between said outer support system and said inside ring, and resilient means urging said array toward said inside ring and enabling a common axial displacement of said array, said outer support system and said inside ring, said outer support system including means, fixed to said stator and plural adjustable wedge means positioned between said means fixed to said stator and said bars of said array and engaging a substantial longitudinal portion thereof for adjusting a force of said outer support system towards said inside ring, said resilient means being arranged between said adjustable wedge means and said coupling means for urging said array of bars towards said inner ring.

20. An end-winding system of a stator of an electric machine having a hollow conical-shaped array of bars expanding coaxially about an axis of the machine at its end areas to define said hollow conical-shape array of bars and having a support means including an inside ring having a conical-shaped outer surface extending along a predominant axial portion of an inner surface of said conical-shaped array of bars to provide an inner supporting surface area for said bars, coextensive with the inner surface along said predominant axial portion, means urging said inside ring in an axial direction to urge said conical-shaped outer surface firmly against said array of bars which expands in a manner to define a hollow conical-shaped array of bars;

and an outer support system engaging an outer surface of said array of bars and being removable and replaceable without a need to disassemble said array of bars, coupling means urging said outer support system towards said inside ring for clamping said array of bars between said outer support system and said inside ring, and spring means urging said outer support system toward said inner ring and enabling a common axial displacement of said array, said outer support system and said inside ring, said outer support system comprising mounting means fixed to said stator and coupling means arranged between said mounting means and said array of bars, said coupling means including outer support means engaging a substantial longitudinal portion of said bars and wedge means slidable relative to said mounting means and said outer support means to support the array of bars in cooperation with said inside ring, at least one of said mounting means and said coupling means providing a spring force substantially in an axial direction.

21. A retrofitting set for a stator end-winding support system of an electric machine having a stator, said system having a stator end-winding comprising a hollow conical-shaped array of bars expanding outwards coaxially about an axis of the machine and forming said hollow conical-shaped array of bars having inner and outer conical-shaped surfaces, said set comprising an inside ring having a conical-shape outer surface of an extent conforming to at least a predominant portion of the inner conical-shaped surface of said array of bars to provide a surface area supporting said array of bars and coextensive with said predominant portion of the inner conical surface;

an outer support system surrounding the outer conical-shaped surface of said array of barb and bracing means including resilient means for normally axially urging said outer support system with a spring force towards the stator of said machine and means for urging said outer support system towards said inside ring whereby said resilient means resiliently urges said outside ring and said inside ring towards said stator of said machine, said retrofitting set being installable and removable to and from said stator end-winding support system without removing the stator end-winding.