Rotor laminae assembly for a cast rotor dynamoelectric machine
First 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.
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Accused Products
Abstract
A rotor assembly for a dynamoelectric machine is characterized by incorporating three different sets of rotor laminations each of which is provided with punched apertures that respectively form conductor slots arcuately spaced around the periphery of the laminae, a plurality of axial coolant passageways extending through the assembly near its inner diameter, a plurality of arcuately spaced radial ducts at axial intervals along the rotor, and vent passageways connecting the radial ducts to the axial coolant passageways to enable cooling air to be forced through the coolant passageways and the vent apertures into the radial ducts and thence into the air gap of the machine when the rotor is assembled in operating position. The rotor of the invention is particularly characterized by incorporating radial cooling ducts that extend between each adjacent pair of conductor slots from the periphery of the rotor to points substantially below the bottoms of the conductor slots in the rotor laminae. All of the laminae are stacked in aligned position and compressed to form tight seals therebetween that prevent molten metal from flowing out of the conductor slots into the interstices between the respective laminations of the assembly during a rotor casting operation.
63 Citations
7 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification