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Salient pole mechanical stress

# 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.

*y*_{average} = 0.12 m

*L*_{z} = 1 m,

*S* = 0.08 * *L*_{z} m^{2}

**Given:**

Young's modulus of steel *E* = 207000 N/mm^{2}

Density of steel ρ = 7800 kg/m^{3}

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*ω^{2}**r* [N/m^{3}]

Winding adds a vertical force which is

*F*_{y} = *m*ω^{2}**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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