Patent ID: 6617749
Filing Date: 2003-09-09
Classification: H02K

Abstract:
A gas cooled dynamoelectric machine, comprising:a rotor having a body portion, said rotor having axially extending coils and end turns defining a plurality of endwindings extending axially beyond at least one end of said body portion; and at least one spaceblock located between adjacent said endwindings so as to define cavities therebetween, said spaceblock having first and second side walls engaging said adjacent endwindings, an upstream wall, and a downstream wall, said downstream wall of said spaceblock having a non-planar contour to lower a suction pressure developed adjacent a trailing edge of the spaceblock to enhance cooling flow, wherein said downstream wall has a re-entrant contour to enhance rotating cavity cooling flow, wherein said downstream wall is defined as a generally part circular concave curve.