Shroud for dynamoelectric machine

Claim 1

A dynamoelectric machine comprising: (a) a stator member having an upper end and a lower end and having windings therein and end windings extending from the upper and lower ends thereof, said stator member having stator ducts extending therethrough in a generally radial direction, (b) a rotor member concentrically mounted within said stator member and axially rotatable therewithin to define an air gap, (c) a spider on said rotor member having upper and lower walls supporting a rim, a plurality of poles saliently positioned on said rim and ventilation ducts spaced therebetween to define radial gas passages to said gap and to cooperating gas passages in said stator ducts, (d) means for admitting a first stream of cooling gas to said spider and directing said stream transversely through said ventilation ducts, gap and stator ducts, (e) a shroud means mounted at the upper end and the lower end of said stator member between said gap and said end windings, said shroud means extending transversely therefrom over each of the respective upper and lower walls of said spider to define a gas inlet passage therebetween, and (f) directional blades on said upper and lower walls of said spider positioned within each respective gas inlet passage for drawing a second stream of gas radially outward through the gas inlet passage for passage axially between said poles of said rotor and then transversely through said gap and said stator ducts in conjunction with said first stream.