Generators with Shaft Mounted Turbine Runners

by David A. Stinocher, Reliance Electric, Mankato, MN, USA,

Document Type: Proceeding Paper

Part of: Water Power '87


Water turbine runners mounted on an extended generator shaft are often specified to eliminate turbine bearings and the flexible shaft coupling. Two bearing single shaft turbine generator designs are often less expensive to build and maintain than four bearing units. They are also more compact which can reduce the size of the powerhouse. A computer program has been developed to combine the turbine runner mass, shaft extension dimensions, and hydraulic forces with generator data to predict bearing loads, shaft stresses, shaft deflections, and critical speeds. This program is used both during the proposal and design stages. This paper shows how data given by the turbine manufacturer is used to design the generator and what assumptions are made when this data is incomplete.

Subject Headings: Shafts | Turbines | Hydraulic loads | Computer aided design | Hydraulic design | Water management | Coupling | Design/Build

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