Rotor laminae assembly for a cast rotor dynamoelectric machine

Claim 1

A rotor laminae assembly for a dynamoelectric machine having cast axial conductors and radial ventilating ducts extending between said conductors at axially spaced intervals, characterized by the improvement comprising: 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 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 vent laminae each provided with apertures that define, respectively, a plurality of conductor slots arcuately spaced adjacent to the periphery of the laminae and a plurality of vent apertures arcuately spcaced between the inner ends of said conductor slots and the inner diameter of the laminae, each of said vent apertures being formed with a radial dimension substantially greater than the maximum radial dimension of the coolant passageway formed in said main laminae, c. a plurality of substantially flat, annular 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 coolant passageways arcuately spaced between the inner ends of the conductor slots and the inner diameter of the laminae, and a plurality of coolant duct slots extending from the periphery of the laminae to a point between the inner ends of the conductor slots and the outer extent of the coolant passageways, said point being radially positioned between said outer extent of the coolant passageways and the outer extent of the vent apertures in adjacent vent laminae thereby to place the inner end of each duct slot in overlapping relationship with an adjacent vent aperture and to position each vent aperture in overlapping relationship with a coolant passageway in adjacent main rotor laminae, d. said plurality of main rotor laminae, vent laminae and duct laminae being aligned with each other to place the conductor slots in alignment, and a plurality of cast electrical conductors disposed, respectively, in each of said conductor slots and joined together at the opposite ends thereof, respectively, by a pair of annuli cast with said conductors, said cast conductors being effective to hold the rotor laminae assembly together.