Capped flat end windings in an electrical machine

Abstract

End windings (40) of the field windings of a generator rotor body (47) are flattened. A cap (50) having a flat undersurface (52) overlies the flattened end windings and an enclosure ring (54) extends about the end windings and cap. Apertures (58) are formed through the cap in communication with gaps between the coils of the end windings and passageways (60) formed along the outer surface of the cap. The passageways and apertures form ventilation paths for a cooling medium flowing through the end windings outwardly into the air gap between the rotor body and stator.

Description

technical field [0001] The invention relates primarily to electric machines of the type having a rotor and field windings including end windings surrounding the rotor body, and in particular to end windings flattened across the pole width, together with a cooling medium diameter for the end windings Cover for outward flow ventilation. Background technique [0002] In an electric machine, such as a generator, a rotor body is provided with field windings, which generally form arcs at opposite ends of the rotor body and are called end windings. The end windings generally typically extend axially from the rotor body and pass through the abutment or mandrel in a circumferential direction adjacent opposite ends of the body to enter and return in an axial direction along the rotor body. In a typical generator construction, the windings are placed in slots in the rotor body and wedges hold the windings in the slots. The end windings are typically separated from each other by space...

AI Technical Summary

Problems solved by technology

The end retaining ring or closing ring thus becomes an obstacle to the discharge of the cooling medium path through the rotor end winding

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