B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
117/119
B05D 1/18 (2006.01) B05D 3/02 (2006.01) B05D 3/14 (2006.01)
Patent
CA 1284750
METHOD OF APPLYING INSULATING MATERIAL TO WINDINGS IN ELECTRICAL MACHINERY ABSTRACT OF THE DISCLOSURE 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. The tank is then lowered and the stator and windings are inverted so that a portion of the 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 temperatures of the windings to the point where the adhered varnish cures. The stator is then placed in an oven for several minutes to cure the varnish on components that are not heated by the resistance heating of the windings, such as the winding leads and slot insulation.
516667
Ferguson John Herbert
Greenlee Paul Walter
Sheets Marvin William
Smith William Russell
Canadian General Electric Company Limited
Oldham And Wilson
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