Device for securing winding bars in slots of electric machines, especially turbo-generators

• US 4,369,389 A
• Filed: 04/28/1981
• Issued: 01/18/1983
• Est. Priority Date: 05/02/1980
• Status: Expired due to Fees

• Current Assignee: Kraftwerk Union Aktiengesellschaft (Siemens AG)
• Original Assignee: Kraftwerk Union Aktiengesellschaft (Siemens AG)
• Inventors: Lambrecht, Dietrich
• Primary Examiner(s): Skudy, R.
• Application Number:
  US06/258,378
• Time in Patent Office: 630 Days
• Field of Search: 310/214, 310/215, 310/194, 310/60 A, 310/64, 310/, 310/213, 310/43, 336/197
• US Class Current: 310/214
• CPC Class Codes: H02K 3/40 for high voltage, e.g. affording protection against corona discharges
• CPC Class Codes: H02K 3/48 in slots
• CPC Class Codes: Y10S 174/19 in a dynamo-electric machine

Abstract

Device for securing winding bars in slots of electric machines, including at least one winding bar having sides and being disposed in each slot, a slot-closing wedge disposed in vicinity of the opening of the slot, at least one wavy slot-closing spring having a given first spring travel distance, and being disposed in the slot in longitudinal direction thereof, the slot-closing spring being formed of glass fabric embedded in a hardenable resin and being compressed by approximately 80% of the given first spring travel distance, and a wavy lateral slot spring having a given second spring travel distance and being disposed between a side of the at least one winding bar and an adjacent side wall of the slot in longitudinal direction of the slot, the lateral slot spring being formed of glass fabric embedded in a hardenable resin and being compressed by at least 85% of the given second spring travel distance.

Claims

1. Device for securing winding bars in slots of electric machines, comprising at least one winding bar having sides and being disposed in each slot, a slot-closing wedge disposed in vicinity of the opening of the slot, at least one wavy slot-closing spring having a given first spring travel distance and being disposed in the slot in longitudinal direction thereof, said slot-closing spring being formed of glass fabric embedded in a hardenable resin and being compressed by approximately 80% of said given first spring travel distance, and a wavy lateral slot spring having a given second spring travel distance and being disposed between a side of said at least one winding bar and an adjacent side wall of the slot in longitudinal direction of the slot, said lateral slot spring being formed of glass fabric embedded in a hardenable resin and being compressed by at least 85% of said given second spring travel distance.

2. Device according to claim 1, including an electrically conducting pigment admixed to said hardenable resin of said lateral slot spring.

3. Device according to claim 1 or 2, wherein said lateral slot spring has corrugations aligned at an angle to the longitudinal direction of the slot.

4. Device according to claim 3, wherein said angle of alignment of said corrugations to the longitudinal direction of the slot is approximately 45°

.

5. Device according to claim 1 or 2, wherein said lateral slot spring is subdivided in the longitudinal direction of the slot.

6. Device according to claim 3, wherein said lateral slot spring is subdivided in the longitudinal direction of the slot.