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A ventilation system for end turn conductors spanning a pole face of a rotor of a dynamoelectric machine includes a first plurality of end turn conductors having a first plurality of longitudinally extending ducts having a respective coolant gas inlet disposed proximate the pole center and a respect

A ventilation system for end turn conductors spanning a pole face of a rotor of a dynamoelectric machine includes a first plurality of end turn conductors having a first plurality of longitudinally extending ducts having a respective coolant gas inlet disposed proximate the pole center and a respective coolant gas outlet disposed inboard of the end of the rotor body, and a second plurality of end turn conductors alternately stacked with, electrically insulated from and disposed in heat flow communication with the first plurality of end turn conductors. Each of the second plurality of end turn conductors includes a longitudinally extending gas coolant duct, having a coolant gas inlet proximate the winding corner and a coolant gas outlet inboard the end of the rotor body. The system is especially applicable to rotor windings wherein the conductors forming the end turns are not large enough to carry adjacent gas coolant ducts without compromising the structural and mechanical integrity of the winding.

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A rotor for a dynamoelectric machine, said rotor comprising: a body portion defining axial winding slots circumferentially spaced on the periphery of the rotor body on either side of a pole portion of the rotor body; and a rotor winding, said rotor winding including: a plurality of axially extending

A rotor for a dynamoelectric machine, said rotor comprising: a body portion defining axial winding slots circumferentially spaced on the periphery of the rotor body on either side of a pole portion of the rotor body; and a rotor winding, said rotor winding including: a plurality of axially extending slot lying portions disposed in said winding slots; a plurality of end turns extending beyond the rotor body and coupled to said plurality of slot lying portions, respective ones of said plurality of end turns electrically insulated from yet disposed in heat flow communication with adjacent ones of said plurality of end turns; first gas coolant means defined in part by preselected ones of said plurality of end turns, said first gas coolant means having a first coolant gas inlet and a first coolant gas outlet; and, second gas coolant means defined in part by preselected other ones of said plurality of end turns, said second gas coolant means having a second coolant gas inlet and a second coolant gas outlet; wherein the developed length between the first coolant gas inlet and the first coolant gas outlet is greater than the developed length between the second coolant gas inlet and the second coolant gas outlet and further wherein said first gas coolant means and said second gas coolant means are the only coolant means defined by the preselected ones and the preselected other ones of said plurality of end turns, respectively; wherein the preselected ones of said plurality of end turns span the pole portion and said first coolant gas inlet is disposed proximate the center of the pole portion; and, wherein the preselected other ones of said plurality of end turns span the pole portion and include a corner between the center of the pole portion and the axial end of the rotor body and further wherein said second coolant gas inlet is disposed proximate the corner.