Salient pole mechanical stress - QuickField simulation example
Salient pole of turbine generator is subject to the centrifugal force loading.
How to find centrifugal stress in salient pole rotor?
Answer Typical applications Geometry
Given
Winding mass m = 600 kg;
Task
Solution
Winding adds a vertical force which is Results
Engineering question
Set up a plane-parallel QuickField Stress Analysis problem for a salient pole rotor and evaluate centrifugal stress from computed field results.
salient pole rotors, turbine generator rotors, synchronous generator poles
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Simulation problem
Problem Type
Plane-parallel problem of stress analysis.
Due to symmetry only one half of the pole is simulated.
yaverage = 0.12 m
Lz = 1 m,
S = 0.08 * Lz m²
Young's modulus of steel E = 207000 N/mm²
Density of steel ρ = 7800 kg/m³
Poisson's ratio ν = 0.3.
Rotational speed ω = 50*2π rad/sec.
Determine the mechanical stress distribution in the salient pole.
The internal centrifugal force acting on the steel pole can be calculated as:
fr(r) = ρ*ω²*R [N/m³]
fy = mω²*yaverage [N].
Since we simulate only half of the pole the force value is divided by factor of 2.
We consider that fy is uniformly distributed along the contact surface S.
Mechanical stress distribution in the pole is shown on the picture
Video
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