End winding for an electrical machine, and method for its production

• US 8,339,002 B2
• Filed: 05/10/2010
• Issued: 12/25/2012
• Est. Priority Date: 05/13/2009
• Status: Active Grant

• Current Assignee: General Electric Technology GmbH (GE Vernova, Inc.)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Hediger, Daniel, Banziger, Matthias
• Primary Examiner(s): NGUYEN, TRAN N
• Application Number:
  US12/776,960
• Publication Number:
  US 20100289355A1
• Time in Patent Office: 960 Days
• Field of Search: 310/71, 310/260
• US Class Current: 310/71
• CPC Class Codes: H02K 2203/09 Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
• CPC Class Codes: H02K 3/505 for large machine windings, e.g. bar windings H02K3/51 takes precedence
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

An end winding is described for a stator of an electrical machine. The end winding includes at least two round connectors via which the current is passed out from the winding bars of the stator, as well as a plurality of supporting brackets, via which the end winding is attached to the stator. The end winding has at least two round connectors having a radial section at whose end a phase connection block is in each case arranged. At least two phase connection blocks of one phase are arranged alongside one another in the circumferential direction. The adjacent phase connection blocks are connected via at least one pin element and is mounted at least partially integrally in recesses in the mutually facing side surfaces of the phase connection blocks. A method for fitting an end winding such as this is also described.

Claims

1. An end winding for a stator of an electrical machine, the end winding comprising at least two round connectors wherein the current is passed out from the winding bars of the stator via said at least two round connectors, and a plurality of supporting brackets, wherein the end winding is attached to the stator by said plurality of supporting brackets;

and, wherein the at least two round connectors have a radial section;

a phase connection block arranged at an end of said radial section, and wherein at least two phase connection blocks of one phase are arranged adjacent one another in the circumferential direction, the adjacent phase connection blocks are connected via at least one pin element and said at least one pin element and is mounted at least partially integrally in recesses in the mutually facing side surfaces of the phase connection blocks.

2. The end winding as claimed in claim 1, wherein the pin element is in the form of a connection pin with a circular-cylindrical outer surface, and the recesses are in the form of cylindrical blind holes, and in that the attachment of the connection pin is essentially exclusively integral.

3. The end winding as claimed in claim 1, wherein the end winding is designed for three phases and has at least three pairs of phase connection blocks which are connected to one another via in each case one pin element, wherein six pairs of phase connection blocks are provided, and in each case two pairs of phase connection blocks are provided per phase and are arranged one behind the other in an axial direction.

4. The end winding as claimed in claim 1, wherein the pin element has at least one of depressions or grooves on the end face, in combination and in conjunction with at least one of depressions or grooves which are arranged in the circumferential surface and have a length, starting on the end face in the axial direction of the pin element, which is shorter than the depth of the recess.

5. The end winding as claimed in claim 1, wherein the pin element is formed integrally and is composed of a metallic material or an insulating material.

6. The end winding as claimed in claim 1, wherein the pin element is composed of plastic or glass-fiber-reinforced plastic.

7. The end winding as claimed in claim 1, wherein the pin element is in the form of a connection pin with a circular-cylindrical outer surface, and the recesses are in the form of cylindrical blind holes, wherein the external diameter of the connection pin is in the range from 0.01 mm to 2 mm less than the internal diameter of the recess, and wherein the recesses have a penetration depth for the connection pin in the range from 5 mm to 40 mm, or wherein the connection pin has a length in the range from 10 mm to 80 mm or has a diameter in the range from 5 mm to 60 mm.

8. The end winding as claimed in claim 1, wherein the recesses are in the form of blind holes in the phase connection blocks, and an externally accessible connecting channel opens into a bottom area of the blind holes, wherein, the bottom area has an accommodation area into which the pin element does not project, even when the pin element is being pushed completely into the recess.

9. The end winding as claimed in claim 8, wherein the connecting channel has means with the aid of which an introduction aid for the material for the interlocking attachment can be attached to the respective phase connection block for the attachment of the pin element, the means being an internal thread arranged in an inner wall of the connecting channel.

10. The end winding as claimed in claim 1, wherein the pin element is mounted in the recesses with the assistance of a curing plastic material.

11. The end winding as claimed in claim 1, wherein the radial sections of round connectors are each guided with respect to phase connection blocks, and are arranged adjacent one another, the radial sections of round connectors are connected via at least one connection element.

12. The end winding as claimed in claim 2, wherein at least one connection pin is arranged for connection of two adjacent phase connection blocks, and a major axis of the at least one connection pin is arranged essentially tangentially to the circumference of the stator.

16. The end winding as claimed in claim 1, wherein the pin element has grooves on the end face, in the form of a star, in combination and in conjunction with at least one of depressions or grooves which are arranged in the circumferential surface have a length, starting on the end face in the axial direction of the pin element, which is at least 2 mm to 5 mm shorter, than the depth of the recess.

17. The end winding as claimed in claim 1, wherein the pin element is in the form of a connection pin with a circular-cylindrical outer surface, and the recesses are in the form of cylindrical blind holes, wherein the external diameter of the connection pin is in the range from 0.01 mm to 2 mm less than the internal diameter of the recess, and wherein the recesses have a penetration depth for the connection pin in the range from 10 mm to 30 mm, or wherein the connection pin has a length in the range from 20 mm to 50 mm, or has a diameter in the range from 20 mm to 40 mm.

18. The end winding as claimed in claim 1, wherein the pin element is mounted in the recesses with the assistance of a cold curing epoxy resin.

19. The end winding as claimed in claim 1, wherein the radial sections of round connectors are each guided with respect to phase connection blocks, and are arranged adjacent one another, the radial sections of round connectors are connected via at least one connection element, wherein the at least one connection element comprises windings composed of glass-fiber-reinforced plastic material knurling or strips.

13. A method for fitting an end winding, the end winding comprising at least two round connectors wherein the current is passed out from the winding bars of the stator via said at least two round connectors, and a plurality of supporting brackets, wherein the end winding is attached to the stator by said plurality of supporting brackets;

and, wherein the at least two round connectors have a radial section;

a phase connection block arranged at an end of said radial section, and wherein at least two phase connection blocks of one phase are arranged adjacent one another in the circumferential direction, the adjacent phase connection blocks are connected via at least one pin element and said at least one pin element is mounted at least partially integrally in recesses in the mutually facing side surfaces of the phase connection blocks, the method comprising;

pushing the at least one pin element into the recess in the first phase connection block, and

pushing the recess in the second adjacent phase connection block onto a part of the at least one pin element that projects out of the first phase connection block,

arranging, aligning and fixing the round connectors, in a final spatial arrangement, wherein a connection material for integral connection of the at least one pin element is either introduced into the recesses before the at least one pin element is pushed in or is applied to the at least one pin element, or a connection material for integral connection of the at least one pin element is introduced via connecting channels which open into a bottom area of the recesses, which are in the form of blind holes.

14. The method as clamed in claim 13, wherein the bottom area of the blind holes has an accommodation area into which the at least one pin element does not project, even when it has been pushed completely into the recess, and wherein the accommodation area, grooves arranged in the at least one pin element or arranged in the inner surface of the recess, or depressions are essentially filled with the connection material.

15. The method as claimed in claim 13, wherein the connection material is a plastic material.

20. The method as claimed in claim 13, wherein the connection material is a cold-curing epoxy resin.