Dynamoelectric machine rotor endwindings with corner cooling passages

Claim 1

In a dynamoelectric machine having endwindings including a plurality of stacked conductor bars and stacked end turns having ends respectively registering with one another and forming junctions, said plurality of stacked conductor bars and said plurality of stacked end turns being angularly related each to the other such that said junctions form a joint assembly with side surfaces of said conductor bars and said end turns lying on one side of said joint assembly, apparatus for cooling the joint assembly formed by said junctions of said conductor bars and said end turns, comprising: means for securing the ends of the registering conductor bars and end turns one to the other; at least one of said plurality of stacked conductor bars and one of said plurality of stacked end turns each having a passage for passing cooling gas therealong and a port in communication with the cooling passage for passing cooling gas therethrough, said port in said one conductor bar opening through said side surface thereof on said one side of said joint assembly and short of the junction of said one conductor bar and its registering end turn, said port in said end turn opening through said side surface thereof on said one side of said joint assembly and short of the junction of said one end turn and its registering conductor bar; a block on said one side of said joint assembly having lateral portions engageable with said side surfaces of said stacked conductor bars and said stacked end turns, respectively, and having a surface in spaced opposition to said junctions to define with said side surfaces a chamber forming a cooling gas channel extending between and in communication with said ports along said one side of said joint assembly whereby cooling gas may pass through said passages, said ports and said chamber.