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What is the formula for the height of pole shoe sufficient to accommodate the damper windings?

What is the formula for the height of pole shoe sufficient to accommodate the damper windings? Correct Answer height of pole shoe = 2 * diameter of damper bars

First the diameter of the damper bars is calculated. It is then multiplied by 2 to get the height of pole shoe.

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The pole shoe drawing is completed by fixing the height of pole shoe.