Method and device for producing conductor bars for dynamoelectric machines

• US 5,771,563 A
• Filed: 01/23/1996
• Issued: 06/30/1998
• Est. Priority Date: 02/15/1995
• Status: Expired due to Term

• Current Assignee: Alstom Technology Ltd. (Alstom SA)
• Original Assignee: Asea Brown Boveri AG (ABB Limited)
• Inventors: Muller, Gunter, Meier, Walter
• Primary Examiner(s): Bray, W. Donald
• Application Number:
  US08/589,088
• Time in Patent Office: 889 Days
• Field of Search: 29/592.1, 29/596, 29/597, 29/446, 29/402.08, 29/402.16, 310/214, 310/60 A, 310/54, 228/165, 228/170
• US Class Current: 29/596
• CPC Class Codes: H02K 15/0414 Windings consisting of separate elements, e.g. bars, hairpins, segments, half coils
• CPC Class Codes: H02K 15/12 Impregnating, heating or drying of windings, stators, rotors or machines
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49011 Commutator or slip ring assembly
• CPC Class Codes: Y10T 29/49742 Metallurgically attaching preform
• CPC Class Codes: Y10T 29/49863 with prestressing of part

Abstract

In the method for producing conductor bars for dynamoelectric machines, the conductor bars are inserted, with a main insulation (4), applied when dry, into a pressing device with the interposition of a separating film, are pressed to size in said pressing device and, together with the pressing device, are impregnated with impregnating resin in an impregnating vessel and cured.

In order to increase the dimensional accuracy of the conductor bars and to simplify the production method, the dry-insulated conductor bars are inserted (10, 11) individually into a pressing device which is adapted to the bar shape and surrounds the conductor bar over its entire length and circumference and are pressed to the final dimension in said pressing device. Subsequently, a plurality of conductor bars thus prepared are inserted together with the associated pressing device into the impregnating vessel and impregnated there with impregnating resin.

Claims

1. A method for producing conductor bars for dynamoelectric machines, in which the conductor bars are arranged with a main insulation applied when dry, in a pressing device with the interposition of a separating film, are pressed to size in said pressing device and, together with the pressing device, are impregnated with impregnating resin in an impregnating vessel and cured, the method comprising the steps of:

inserting the dry insulated conductor bars into a pressing device, wherein said pressing device is adapted to the conductor bar shape and surrounds the conductor bar over its entire length and circumference;

pressing the conductor bar and insulation into the final dimension in said pressing device; and

impregnating the conductor bars by inserting the bars and the pressing device into the impregnating vessel which is filled with impregnating resin.

2. The method as claimed in claim 1, wherein the pressing device comprises a plurality of pressing strips, said pressing strips divided in the circumferential direction of the bar, said pressing strips closed along the longitudinal edges of the bar, wherein said pressing device is not reopened until after impregnation and curing.

3. The method as claimed in claim 2, wherein said pressing strips are welded to one another.

4. The method as claimed in claim 2, wherein said pressing strips are welded to one another with angular links.

5. A device for carrying out the method as claimed in claim 1, comprising:

pressing strips, wherein said pressing strips surround the dry insulated conductor bar, said pressing strips are welded to one another at points along their longitudinal edge.

6. The device as claimed in claim 5, wherein said pressing strips have an L-profile, and each embrace the conductors bar with their two legs respectively on two abutting lateral surfaces of said conductor bars, said strips are joined to one another at their ends.

7. The device as claimed in claim 5, wherein said pressing strips are joined by at least two angular links which are respectively welded to the pressing strips at their free ends.

8. The device as claimed in claim 5, wherein said pressing strips are subdivided in the longitudinal direction of the bar, at least the parts of the pressing strips assigned to the face clip part of the conductor bar being separated from the slot section.

9. The device as claimed in claim 6, wherein said pressing strips are joined by at least two angular links which are respectively welded to the pressing strips at their free ends.

10. The device as claimed in claim 6, wherein said pressing strips are subdivided in the longitudinal direction of the bar, at least the parts of the pressing strips assigned to the face clip part of the conductor bar being separated from the slot section.

11. The device as claimed in claim 7, wherein said pressing strips are subdivided in the longitudinal direction of the bar, at least the parts of the pressing strips assigned to the face clip part of the conductor bar being separated from the slot section.