General Electric Company

Dennis R Ulery

Richard J Keck

Steven Charles Walko

Vincent G Terry

Edmund E Kazmierczak

James R Pedersen

Duncan N Walker

Brian E Gott

Blake Weldon Wilson

Thomas B Jenkins

Lester H Lee

John P Courtney

Robert W Nason

Robert P Salerno

Disclosed is a rotor body for an electric machine having slots for windings and slot keys with wedges for retaining the windings in the slots. The slot keys contain elongated spring strips underlying an amortisseur, in turn, underlying the wedges in the slot keys. The spring strips bias the amortisseur and wedges radially outwardly. Thus, the wedges lie in sufficient, low-resistance, efficient electrical contact with the rotor body at start-up and during low rotor speeds to prevent arcing and localized heating along the interfaces of the rotor parts otherwise resultant from induced surface currents at start-up and low rotor speeds. At the rotor ends, the spring strips bias the amortisseur ends radially outwardly into efficient electrical contact with retaining rings at opposite ends of the rotor body. A tool is also provided having a main arm, a pair of pivotally mounted dogs for engagement in the slot key and straddling the external surface of the slot key, respectively, whereby the tool may be fixed in axial position along the slot key by pressure on the main arm. A second pivotal arm carries a wedge-engaging head whereby the lever is fixed in the slot and the second arm drives the wedge longitudinally into axial position in the slot key.

Apparatus affording efficient electrical contact between rotor surface

A tool for applying slot wedges having a main arm, a pair of pivotally mounted dogs for engagement in the slot key and straddling the external surface of the slot key, respectively, whereby the tool may be fixed in axial position along the slot key by pressure on the main arm. A second pivotal arm carries a wedge-engaging head whereby the lever is fixed in the slot and the second arm drives the wedge longitudinally into axial position in the slot key.

Tool for applying slot wedges

A method and apparatus for the assembly and disassembly of dovetail shaped wedges into and from the coil slots of dynamoelectric rotors using a fixture attached to a rotor shaft coupling in a selectable radial position so as to be aligned with a rotor slot. The method and apparatus further uses a pulling tool attached to a wedge and also connected to a winch located on the fixture via a winch belt extending between the tool and fixture.

Generator rotor slot wedge assembly and disassembly fixture

Generator rotor slot wedge tool

Generator rotor slot wedge assembly and disassembly

A U-shaped subslot liner is disposed in the bottom of a slot in the rotor of a dynamoelectric machine. A stack of conductors and insulating layers is supported by arms of the subslot liner durig manufacture. The subslot liner, together with the lower conductor, defines a coolant channel for conveying a gaseous coolant to the conductors. A slot armor lines the sides of the slots where it is retained against centrifugal acceleration by the subslot liner. In one embodiment, the slot armor passes completely under the subslot liner. In other embodiments, the slot armor is in two pieces, each affixed to the subslot liner.

Subslot liner for rotor of dynamoelectric machine

Growing community of inventors

Saratoga, NY, United States of America

Dennis R Ulery