Abb Research Ltd.

Alstom

Stephan Hess

Reinhard Joho

Michael Jung

Johann Schubert

Jens Von Wolfersdorf

Hans Zimmermann, Deceased

Hans Zimmerman

Christoph Hirsch

In an air-cooled electrical machine having reverse cooling in a closed cooling circuit, a two-stage blade cascade for the optimum incident flow of cooling air to the rotor ( ) and the rotor winding ( ) is provided between a rotor cap plate ( ) and a rotor shaft ( ). The first blade cascade stage ( ) in the direction of flow is a deceleration cascade having pressure-generating properties, and the following blade cascade stage ( ) in the direction of flow is a deceleration cascade having deflecting properties.

Rotor of a turbogenerator having direct gas cooling incorporating a two-stage flow cascade

In a turbo-generator (10) having a rotor (11) and a stator (12) concentrically surrounding the rotor (11) and separated from the rotor (11) by an air gap (14), and also having a cooling arrangement in which a main fan (33) draws in a gaseous cooling medium flowing through corresponding cooling passages in the rotor (11) and in the stator (12) and forces it through a cooler (22, 23, 24) back into the cooling passages, the cooling medium flowing through the rotor (11) in the axial direction, issuing in a heated state into the air gap (14) and being returned from the air gap (14) to the main fan (33), improved rotor cooling is achieved in that the cooling medium heated by the rotor (11) is directed radially outward from the air gap (14) through outflow passages (15) in the stator (12) and is returned to the main fan (33) outside the stator (12) via a cooling-air return (21).

Turbo-generator

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Bad Sackingen, Germany

Stephan Hess