Electromagnetic Forces, Bending Moments, and Mechanical Stresses in the Turbine Generator Stator Outer Segments
DOI:
https://doi.org/10.24160/0013-5380-2026-7-54-60Keywords:
turbine generator, end packages, electromagnetic forces, bending moments, mechanical stressesAbstract
The article addresses matters concerned with fatigue failure of the turbine generator stator iron segments. Taking into account the design features, electromagnetic loads and turbine generator operating modes, a traveling wave of electromagnetic force density acting on the outer segments of the stator end packages is specified. The force action concentration at the tooth edges of fanned segments is taken into account in analytical solutions for time-pulsating bending electromagnetic moments acting on radial and tangential fastening (fixing) of segments. Solutions for bending moments are obtained using an equivalent lumped force. It has been found that for the ratios of the tooth width and the pole arc length used in turbine generators, the bending moments are essentially unchanged along the tooth width, regardless of the fixing locations. The segment bending moment relative to the radial fixing is similar to the moment of a radial cantilever beam, locates along the plate edge and is proportional to the equivalent force acting at the tooth radial edge at the center between the segment lateral edge and tangential fixing and the arm of this force from its application point to the fixing line. The stresses in the segment fixings have been determined, and the criteria of destruction to occur in the case of exceeding them have been determined. It is shown that bending stresses at the edges of tangential fixings are the most dangerous, which is confirmed by the practical experience of examining turbine generators at power plants. Recommendations on preventing the destruction of the outer segments in the turbine generator end zones are given.
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