General Electric Company

Henry W Kudlacik

Madabushi V Chari

Anthony F Armor

Paul Reece

Robert L Winchester

Two coil windings per slot are disposed in a dynamoelectric machine rotor. The coil winding conductors are stacked on the sides of the rotor slots with the central coil sides separated by a plurality of insulating spacers driven between them in a radial direction and with the spacers distributed in the axial direction along the rotor slots such that radial ventilating passages are formed by the sides of the spacers and coil conductors. Coolant gases enter the slots axially below the coils and progress radially through the ventilating passages as well as the slot creepage block and wedge and discharges from the rotor into the stator-rotor air gap.

Generator rotor winding with two coils per slot

A reactor core includes a plurality of laminations of trapezoidal shape forming the legs of the core. These legs are arranged in generally rectangular configuration with air gaps provided at the corners of the core. These air gaps extend diagonally of the core legs and are formed between the inclined faces of adjacent ends of the trapezoidal-shaped core legs. End plates each having a longitudinal section extending parallel to and fixed to one of the legs and having flanges at each end of the longitudinal section extending perpendicularly to the longitudinal section are provided for maintaining the legs of the core in assembled relation and for effecting adjustment of the air gaps. The end plates include elongated openings in the flanges thereof for permitting movement of each of the end plates, and the leg to which it is affixed, relative to the remainder of the core for varying the size of the diagonal air gaps. A plurality of metallic, non-magnetic spacers having substantially the same shape as the end plates are disposed at intervals between the end plates to separate the core laminations into groups. These spacers carry the magnetic forces tending to close the air gap. Fastening devices extend through the elongated openings and are loosened to permit movement of the end plate and its associated leg relative to adjacent legs for changing the size of the air gaps and then again tightened to hold the legs in the adjusted position. The fastening devices are accessible from the exterior of the reactor to facilitate convenient adjustment of the air gaps. Because of the separation of the laminations into groups to reduce the forces necessary to oppose magnetic forces tending to close the air gaps and also, due to the diagonal construction of the air gaps, which has the effect of reducing the flux density and therefore the magnetic force at the air gaps the fastening devices can be designed to maintain the legs in adjusted position without the need of air gaps blocking spacers in the air gaps. The air gaps, therefore, are available as passages for the flow of cooling gas for removal of heat from the reactor core.

Reactor core

An improved apparatus is provided to cool the flux shields of dynamoelectric machines. In one embodiment of this invention, cooling fins are attached to a flux shield at localized areas of heating of the flux shield referred to as hot spots to reduce the temperatures there to acceptable levels. These fins may be provided with a tapered portion which minimizes the fluid losses associated with the flow of cooling gas over the fins. In another embodiment of the present invention, an annular rim, bored to provide cooling gas passages therethrough, is fixed to the flux shield along an inner portion thereof, to effect the transfer of heat from the flux shield to a flow of the cooling gas through the passages. Finally, in a third embodiment of the present invention, an electrically non-conducting annular baffle is disposed around the flux shield adjacent an inner surface thereof to direct a flow of cooling gas across the inner surface of the flux shield thereby cooling the same.

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Schenectady, NY, United States of America

Henry W Kudlacik