END WINDING FOR AN ELECTRICAL MACHINE, AND METHOD FOR ITS PRODUCTION

• US 20100289355A1
• Filed: 05/10/2010
• Published: 11/18/2010
• Est. Priority Date: 05/13/2009
• Status: Active Grant

• Current Assignee: General Electric Technology GmbH (GE Aerospace)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Bänziger, Matthias, Hediger, Daniel
• Granted Patent: US 8,339,002 B2
• Time in Patent Office: Days
• 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 (1) via which the current is passed out from the winding bars of the stator, and a plurality of supporting brackets (2), via which the end winding is attached to the stator, wherein the at least two round connectors (1) have a radial section (10) at whose end a phase connection block (6) is in each case arranged, and wherein at least two phase connection blocks (6) of one phase are arranged alongside one another in the circumferential direction, the adjacent phase connection blocks (6) are connected via at least one pin element (9) and is mounted at least partially integrally in recesses (12) in the mutually facing side surfaces of the phase connection blocks (6).

2. The end winding as claimed in claim 1, wherein the pin element (9) is in the form of a connection pin with a circular-cylindrical outer surface, and the recesses (12) are in the form of cylindrical blind holes, and in that the attachment of the connection pin (9) 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 (6) which are connected to one another via in each case one pin element (9), wherein six pairs of phase connection blocks (6) are preferably provided, and in each case two pairs of phase connection blocks (6) are provided per phase and are preferably arranged one behind the other in an axial direction.

4. The end winding as claimed in claim 1, wherein the pin element (9) has depressions and/or grooves on the end face (18), preferably a plurality of grooves (17) in the form of a star, preferably in combination and in conjunction with depressions and/or grooves (20) which are arranged in the circumferential surface (19) and in particular preferably have a length, starting on the end face in the axial direction of the pin element (9), which is shorter, preferably at least 2 mm to 5 mm shorter, than the depth (t) of the recess (12).

5. The end winding as claimed in claim 1, wherein the pin element (9) 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 (9) is composed of plastic, in particular glass-fiber-reinforced plastic.

7. The end winding as claimed in claim 1, wherein the pin element (9) is in the form of a connection pin with a circular-cylindrical outer surface, and the recesses (12) 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 (12), and wherein the recesses (12) preferably have a penetration depth (t) for the connection pin in the range from 5 mm to 40 mm, preferably in the range from 10 mm to 30 mm, and/or wherein the connection pin (9) preferably has a length in the range from 10 mm to 80 mm, preferably in the range from 20 mm to 50 mm, and/or has a diameter in the range from 5 mm to 60 mm, preferably in the range from 20 mm to 40 mm.

8. The end winding as claimed in claim 1, wherein the recesses (12) are in the form of blind holes in the phase connection blocks (6), and an externally accessible connecting channel (14) opens into the bottom area of the blind holes (12), wherein, preferably the bottom area has an accommodation area (13) into which the pin element (9) does not project, even when it is being pushed completely into the recess (12).

9. The end winding as claimed in claim 8, wherein the connecting channel (14) 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 (6) for the attachment of the pin element (9), with the means preferably being an internal thread (15) which is arranged in the inner wall of the connecting channel (14).

10. The end winding as claimed in claim 1, wherein the pin element (9) is mounted in the recesses (12) with the assistance of a curing plastic material, wherein the curing plastic material is preferably a cold-curing epoxy resin.

11. The end winding as claimed in claim 1, wherein the radial sections (10) of round connectors (1) which are each guided with respect to phase connection blocks (6) which are arranged adjacent, are connected via at least one connection element (7), wherein the at least one connection element (7) preferably comprises windings composed of knurling and/or strips, preferably composed of glass-fiber-reinforced plastic material.

12. The end winding as claimed in claim 2, wherein at least one connection pin (9) is arranged for connection of two adjacent phase connection blocks (6), and its major axis is arranged essentially tangentially to the circumference of the stator.

13. A method for fitting an end winding, the end winding comprising at least two round connectors (1) via which the current is passed out from the winding bars of the stator, and a plurality of supporting brackets (2), via which the end winding is attached to the stator, wherein the at least two round connectors (1) have a radial section (10) at whose end a phase connection block (6) is in each case arranged, and wherein at least two phase connection blocks (6) of one phase are arranged alongside one another in the circumferential direction, the adjacent phase connection blocks (6) are connected via at least one pin element (9) and is mounted at least partially integrally in recesses (12) in the mutually facing side surfaces of the phase connection blocks (6), the method comprising:

pushing the at least one pin element (9) into the recess (12) in the first phase connection block (6), and

pushing the recess (12) in the second adjacent phase connection block (6) onto a part of the at least one pin element (9) that projects out of the first phase connection block (6),

arranging, aligning and fixing the round connectors (1), in a final spatial arrangement, wherein a connection material for integral connection of the at least one pin element (9) is either introduced into the recesses (12) before the at least one pin element (9) is pushed in or is applied to the at least one pin element (9), and/or a connection material for integral connection of the at least one pin element (9) is introduced via connecting channels (14) which open into a bottom area of the recesses, which are preferably in the form of blind holes (12).

14. The method as clamed in claim 13, wherein the bottom area of the blind holes (12) has an accommodation area (13) into which the at least one pin element (9) does not project, even when it has been pushed completely into the recess (12), the accommodation area (13) as well as grooves (17, 20), which may be arranged in the at least one pin element (9) and/or may be arranged in the inner surface of the recess (12), and/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, preferably a curing plastic material, and in particular a cold-curing epoxy resin.