General Electric Company

William Paul Dobbins

Timothy J Laskey

Alan Michael Iversen

Mark Markovitz

James Jonathan Grant

Jeffrey D Sheaffer

William E Tomak

Marc Herbert Rigby

Lisa Marie Sternberg

A method for manufacturing a liquid-cooled stator bar suitable for use in a generator. The method includes providing a stator bar comprising a plurality of conducting strands collectively formed into a desired shape, wherein at least one of the conducting strands is configured to channel a liquid for cooling the stator bar. At least one layer of ground wall insulation is applied to the outer portions of the stator bar, and then at least one layer of a conductive tape is applied to an outer area of the ground wall insulation. The ground wall insulation and the conductive tape are cured.

Method for manufacturing liquid-cooled stator bars

Resin-impregnated sheet materials, such as fabrics, films, paper and tapes, for forming electrical insulation that exhibits significantly improved voltage endurance performance. The present invention finds particular use as groundwall insulation for high voltage generator stator bars, in which the groundwall insulation is formed by mica tape filled with submicron particles of silicon dioxide, aluminum oxide, titanium dioxide and/or zirconium dioxide, in combination with an unfilled mica tape impregnated with the same or compatible resin binder. The filled tape is preferably in the form of a mica paper having at least one woven fabric on at least one of its surfaces, a resin binder permeating the mica paper and woven fabric so as to bond the woven fabric to the mica paper, and oxide particles dispersed in the woven fabric.

Electrical insulating material and stator bar formed therewith

The apparatus includes a stand for mounting a mandrel against rotation and a winding assembly for disposition within the mandrel. The mandrel has a slot for receiving a flat sheet through a side wall of the mandrel. A clamping mechanism on the winding assembly clamps the leading edge to the winding assembly within the mandrel. By winding the assembly, the flat sheet is drawn into the mandrel and formed into an arcuate configuration. The mandrel with curved sheet is removed from the stand and disposed in an oven for setting the plastic material in the curved configuration whereby the flat sheet is preformed into a radius approximating the radius of the rotational part about which the insulation will be installed.

Methods for forming arcuate insulation sheets for dynamoelectric machines

Method of installing insulation between a retaining ring and a rotor of

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Clifton Park, NY, United States of America

William Paul Dobbins