Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1985-11-26
1988-12-20
Lawrence, Evan
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427116, 427379, 4273882, 427435, B05D 314, B05D 302, B05D 118
Patent
active
047924624
ABSTRACT:
A method of applying solventless varnish to stator windings in electrical machinery. A magnetic core having a plurality of stator windings disposed in the slots of the core is positioned above a tank containing a solventless varnish, and the tank is then raised to immerse the end turns of the windings on one end of the core into the varnish. The windings are energized to heat them and the varnish which adheres to the end turns to reduce the viscosity of the varnish. The tank is then lowered and the stator and windings are inverted so that a portion of the reduced viscosity varnish which adheres to the end turns flows downwardly through the slots of the stator. This is repeated until varnish begins to flow freely through the slots to the other end, thereby indicating that good coating of the winding within the slots has been accomplished. Next, the current through the windings is increased to raise the temperature of the end turns of the windings to the gel point of the varnish, and the end turns on both ends of the stator are then alternately dipped into the varnish bath to build up a protective coating on the end turns. Once a sufficient thickness has been achieved, the current through the windings is increased further to raise the temperature of the windings to the point where the adhered varnish cures. Then, the stator components not heated by the resistance heating are cured in an oven.
REFERENCES:
patent: 2414525 (1947-01-01), Hill et al.
patent: 3904785 (1975-09-01), Baumann
"GE 701 Solventless Varnish", application data sheet AD-404, Schenectady, N.Y., General Electric Co., Insulating Materials, Jul. 19, 1977.
"GE 701 Solventless Varnish", product data sheet PD-411, Schenectady, N.Y., General Electric Co., Insulating Materials, Oct. 15, 1970.
Greenlee Paul W.
Sheets Marvin W.
Smith William R.
General Electric Company
Krisher, Jr. Ralph E.
Lawrence Evan
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