Large Low-Speed Generators with Skewed Supporting Partsby Friedrich Mez, Brown Boveri AG, Birr, Switzerland,
Abstract: During the past decade, the demand for hydro-generators has been for increasingly high ratings, up to the present maximum of about 800 MVA. These low-speed machines have rotor diameters of over 15 m. As a result of the centrifugal forces and temperature rises, the generator components are subject to large forces and extensive thermal expansion which require special care during the design stage. Only by providing for free expansion can harmful internal stresses in the materials and undesirable forces in the connecting parts be eliminated. These requirements are now met most efficiently by incorporating skewed, or oblique, connecting elements in the design.
Subject Headings: Skewness | Equipment and machinery | Ratings | Temperature effects
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