Oil cooled generator

A rotor for a dynamoelectric machine, comprising:

• a rotor shaft including a first shaft having a first shaft wall circumscribing a hollow interior and having at least one first fluid discharge orifice extending through the first shaft wall, and a second shaft within the hollow interior and coupled with the first shaft such that the first shaft and the second shaft are co-rotatable, the second shaft having a second shaft wall and at least one second fluid discharge orifice extending through the second shaft wall, and the at least one first discharge orifice and the at least one second discharge orifice are axially spaced apart;
• and
• a rotor core including a plurality of laminations stacked together, the plurality of laminations including at least one lamination comprising a lamination body with an annular portion circumscribing an open center, a plurality of pole portions extending outwardly from the annular portion relative to the open center, and a plurality of coil winding regions adjacent to corresponding ones of the plurality of pole portions, the annular portion including at least one channel running between a first end that opens to the open center and a second end that opens to one of the plurality of open coil winding regions.

A rotor shaft for a dynamoelectric machine, comprising:

• a first shaft having a first shaft wall circumscribing a hollow interior and having a plurality of first fluid discharge orifices extending through the first shaft wall;
• and
• a second shaft within the hollow interior and coupled with the first shaft such that the first shaft and the second shaft are co-rotatable, the second shaft having a second shaft wall and a plurality of second fluid discharge orifices extending through the second shaft wall, the plurality of first discharge orifices and the plurality of second discharge orifices are axially spaced apart and a ratio of the number of the first fluid discharge orifices to the number of the second fluid discharge orifices is between 1 and 4.

An insulator for a coil winding of a dynamoelectric machine, comprising:

• an elongated insulator body comprising an electrically insulating material circumscribing an interior coil winding region and spanning between open ends, the elongated insulator body including a fluid entry orifice between the open ends.

An end plate for a dynamoelectric machine, comprising:

• an end plate body having first and second sides, the first side having a plurality of coil end winding cover portions circumferentially spaced around the first side, and at least one fluid discharge outlet that extends between the first and second sides and is located circumferentially between two of the coil end winding cover portions.