Generator endwinding cooling enhancement

H - Electricity – 02 – K

Patent

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H02K 9/10 (2006.01) H02K 1/32 (2006.01) H02K 3/24 (2006.01)

Patent

CA 2399345

A gas cooled dynamoelectric machine is provided that is comprised of a rotor (10), a rotor winding comprising axially extending coils (22) and concentric endwindings (28, 128, 228) and a plurality of spaceblocks (40, 140, 240) located between adjacent endwindings thereby to define a plurality of cavities (42, 142, 242), each bounded by adjacent spaceblocks and adjacent endwindings. To enhance the heat transfer rate from the copper end turns (27, 127, 227) of the field endwinding region, cavity facing surface(s) (144, 146, 156, 244, 246, 256) of the endwinding (128, 228) and/or the spaceblock (140, 240) have a non-planar surface profile to increase surface area, improve turbulent mixing on the surface, and/or provide boundary layer breakup.

L'invention concerne une machine dynamoélectrique refroidie par gaz, constituée d'un rotor (10), d'un bobinage de rotor comportant des bobines (22) s'étendant axialement et de bobinages d'extrémité (28, 128, 228) concentriques, ainsi que d'une pluralité de blocs d'espacement (40, 140, 240) situés entre des bobinages d'extrémité adjacents, définissant ainsi une pluralité de cavités (42, 142, 242), reliées chacune par des blocs d'espacement adjacents et des bobinages d'extrémité adjacents. Afin d'améliorer le taux de transfert thermique à partir des spires d'extrémité (27, 127, 227) en cuivre de la zone de bobinage d'extrémité de champ, une/des surface(s) (144, 146, 156, 244, 246, 256) du bobinage d'extrémité (128, 228) et/ou du bloc d'espacement (140, 240) faisant face aux cavités présente/ent un profil de surface non plane, de sorte à augmenter la zone de surface, à améliorer le mélange turbulent sur la surface et/ou à fournir une rupture de la couche limite.

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