Salient pole mechanical stress

QuickField simulation example

Salient pole of turbine generator is subject to the centrifugal force loading.

Problem Type
Plane-parallel problem of stress analysis.

Geometry
Due to symmetry only one half of the pole is simulated.
y_average = 0.12 m
L_z = 1 m,
S = 0.08 * L_z m²

Given
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.

Winding mass m = 600 kg;

Task
Determine the mechanical stress distribution in the salient pole.

Solution
The internal centrifugal force acting on the steel pole can be calculated as:
f_r(r) = ρ*ω²*R [N/m³]

Winding adds a vertical force which is
f_y = mω²*y_average [N].
Since we simulate only half of the pole the force value is divided by factor of 2.
We consider that f_y is uniformly distributed along the contact surface S.

Results
Mechanical stress distribution in the pole is shown on the picture

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