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# Salient pole mechanical stress

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

Problem Type:
Plane problem of stress analysis.

Geometry:
Due to symmetry only one half of the pole is simulated.
yaverage = 0.12 m
Lz = 1 m,
S = 0.08 * Lz 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;

Determine the mechanical stress distribution in the salient pole.

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

Winding adds a vertical force which is
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.

Results:
Mechanical stress distribution in the pole is shown on the picture • Video:
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