Patent ID: 8049379
Filing Date: 2011-11-01
Classification: H02K

Abstract:
1. A radial duct for a dynamoelectric machine having a rotor, a plurality of radial slots provided in said rotor, and a plurality of coils respectively seated in said plurality of radial slots, said plurality of coils comprising a plurality of radially stacked turns, said radial duct comprising: one or more cooling slots defined in at least a portion of said radially stacked turns, said one or more cooling slots extending in a substantially radial direction to said rotor, the one or more cooling slots comprising multiple ribs arranged in a radially staggered configuration; and wherein at least a portion of an interior surface of said one or more cooling slots is comprised of one or more radially extending ribs for enhanced heat transfer, the one or more radially extending ribs increasing the surface area of the radial duct, and wherein the one or more radially extending ribs include a breakout that provides an increased electrical strike distance between adjacent ribs.