Laminated rotor for a dynamoelectric machine with coolant passageways therein

A laminated rotor assembly for a dynamo-electric machine having cast axial conductors and radial ventilating ducts extending between said conductors at axially spaced intervals, characterized

• (a) a plurality of substantially flat, annular main rotor laminae each formed with apertures therein to define, respectively, a plurality of conductor slots arcuately spaced adjacent to the periphery of the laminae and a plurality of axial coolant passageways arcuately spaced between the inner ends of said conductor slots and the inner diameter of the laminae,
• (b) a plurality of substantially flat, annular radial duct laminae each provided with apertures that define, respectively, a plurality of conductor slots arcuately spaced adjacent to the periphery of the laminae, a plurality of axial coolant passageways arcuately spaced between the inner ends of the conductor slots and the inner diameter of the laminae, and a plurality of radial coolant duct slots each extending from the periphery of the laminae to points between the inner ends of the respective adjacent conductor slots and the maximum outer extent of the respective adjacent axial coolant passageways, said points being radially positioned between said outer extent of said axial coolant passageways and the outer extent of other axial coolant apertures in adjacent main rotor laminae thereby to place the inner ends of a majority of the radial duct slots in overlapping relationship with respective juxtaposed axial coolant passageways in adjacent main rotor laminae,
• (c) said pluralities of main rotor laminae and radial duct laminae being aligned with each other to place their respective conductor slots in alignment, and a plurality of cast electrical conductors being positioned, respectively, in each of said conductor slots and joined together at the opposite ends thereof, respectively, by a pair of cast annuli integral with said conductors, said cast conductors and annuli being effective to hold the laminated rotor assembly together.