Dynamoelectric machine with air gap baffle assembly including eccentric rings

Claim 1

A dynamoelectric machine comprising: a stator core with a stator winding thereon including end turns extending axially from said stator core, said stator core having a generally tubular configuration; a rotor axially and rotatably mounted within said stator core and spaced therefrom by an air gap; an air gap baffle assembly, for providing a limited leakage coolant gas flow from said air gap, including, (a) an outer ring fastened to said stator winding end turns, said outer ring having a substantially uniform cylindrical outer surface, an annular gas seal between said outer ring and said stator core, said outer ring having an inner surface that includes at least one circumferentially eccentric portion that varies from a region of greater radial thickness of said outer ring at a vertically upward location to a region of lesser radial thickness of said outer ring at a vertically downward location; (b) at least one inner ring fitting respectively against said at least one eccentric portion of said outer ring inner surface and having a converse eccentric configuration so that the inner diameter of said at least one inner ring is uniformly cylindrical with the result that said air gap baffle assembly provides a substantially uniform clearance from said rotor while facilitating assembly of the machine.