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

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

(a) height of pole shoe = diameter of damper bars

(b) height of pole shoe = 2 * diameter of damper bars

(c) height of pole shoe = diameter of damper bars/2

(d) height of pole shoe = 3 * diameter of damper bars/2

I got this question in examination.

My question comes from Design of Rotor in section Design of Synchronous Machines of Design of Electrical Machines

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Correct choice is (b) height of pole shoe = 2 * diameter of damper bars

The explanation is: 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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