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Vacuum Impregnating of Coils

IP.com Disclosure Number: IPCOM000090040D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

DeGroat, PM: AUTHOR [+2]

Abstract

Vacuum impregnating of coils with an electrical insulating resin is facilitated by the use of this process. Coils 1 are loaded in holder 2 of TEFLON*-coated spring steel. Holder 2 has a plurality of clips 3 that encircle coils 1 to prevent swelling of such coils. Holder 2 assumes a semicircular shape as at A prior to its being placed in frame 5 as shown at B and C. Due to the flexibility of holder 2, loading and unloading of coils 1 are greatly facilitated.

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Vacuum Impregnating of Coils

Vacuum impregnating of coils with an electrical insulating resin is facilitated by the use of this process. Coils 1 are loaded in holder 2 of TEFLON*-coated spring steel. Holder 2 has a plurality of clips 3 that encircle coils 1 to prevent swelling of such coils. Holder 2 assumes a semicircular shape as at A prior to its being placed in frame 5 as shown at B and C. Due to the flexibility of holder 2, loading and unloading of coils 1 are greatly facilitated.

Utilizing the above fixture, these process steps are followed.
1. The coils are placed in the holding tool and the loaded

holding tools are placed in the frames.
2. The coils are then preheated ready for vacuum impregnation

in an air circulating oven.
3. Scotchcast** 250A and 250B are preheated separately

to 150 +/- 5 degrees F and mixed thoroughly until a

uniform blend is obtained.
4. The preheated coils are placed in a heated container in the

vacuum chamber. The vacuum chamber is set to maintain a

resin temperature of 150 +/- 5 degrees F when the coil

container is filled with resin in subsequent operations.
5. The preheated and mixed resin is poured into the heated

coil container and a sufficient amount of resin added to

completely cover the coils.
6. The resin temperature is maintained at 150 +/- 5 degrees F while

the chamber is evacuated until the outgassing rate decreases

and becomes relatively constant. The vacuum is then broken

and the coils are ready for cleaning.
7. The co...