Appeal No. 1999-1134
Serial No. 08/334,465
large temperature rises in coolant gas. The Examiner then
finds that Kaminski teaches a need to minimize local hot spots
in rotor windings.
The Examiner then finds that one skilled in the art10
having Kaminski's teaching would have found it obvious to add
perturbent structures in the end turns of Kaminski to induce
turbulence in the flow of fluid through the passage, and
therefore improve cooling.
Upon our review of the Schneider reference, we find that
there is no teaching in Schneider of applying perturbent
structures to the stacked rotor turns of a dynamoelectric
machine. Schneider's sole disclosure of using the perturbent
structures is in spiral helical cooling passages around the
stator of an electric machine to cool the motor.
Laffoon, which is directed to cooling rotors by flowing
of a cooling medium through opening in stacked turns, contains
no teaching or indication of a need for further cooling.
Kaminski's invention deals with longitudinal grooves
10Answer, bottom of page 6 through top of page 7.
8
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