Main >>Applications >> Sample problems >> Salient pole mechanical stress
Salient pole of turbine generator is subject to the centrifugal force loading.
Plane 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.
Winding mass m = 600 kg;
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]
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.
Mechanical stress distribution in the pole is shown on the picture