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AssigneeGeneral Electric Company
InventorsWilliam R. Smith, Marvin W. Sheets, Paul W. Greenlee
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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.
A method of coating insulation on a winding comprising a plurality of turns of wire disposed in slots of a magnetic core wherein a portion of the winding protrudes from opposite ends of the core wherein the insulation is formed from a liquid insulating material characterized by having a first viscosity level at a first temperature range, by having a viscosity level less than the first viscosity level at a second temperature range higher than the first temperature range, by gelling at a third temperature range above the second temperature range and thereby having a viscosity level greater than the first viscosity level, and by curing at sufficiently high temperatures, the method comprising:
The method of coating insulation on a winding comprising a plurality of turns of wire disposed in slots of a magnetic core and having first and second end portions that protrude beyond respective end faces of the core, wherein the insulation is formed from a liquid insulating material characterized by having a first viscosity level in a first temperature range, by having a viscosity level less than the first viscosity level at a second temperature range higher than the first temperature range, by gelling at a third temperature range above the second temperature range and thereby having a viscosity level greater than the first viscosity level, and by curing at a sufficiently high temperature, said method comprising:
The method of coating insulation on a winding comprising a plurality of turns of wire disposed in slots of a magnetic core wherein end portions of the winding protrudes from both ends of the core wherein the insulation is formed from a liquid insulating material characterized by having a first viscosity level in a first temperature range, by having a viscosity level less than the first viscosity level at a second temperature range higher than the first temperature range, by gelling at a third temperature range above the second temperature range and thereby having a viscosity level greater than the first viscosity level, and by curing at a sufficiently high temperature, the method comprising:
A method of coating a protective material onto a winding comprising a plurality of turns of wire disposed in slots of a magnetic core wherein an end portion of the winding protrudes from one end of the core comprising:
Dependencies are inferred from the claim text.