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What are the factors the pole face loss depends upon?

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in Design of Electrical Machines by (687k points)
What are the factors the pole face loss depends upon?

(a) slot opening

(b) air gap length

(c) number of slots and speed of machines

(d) slot opening, air gap length, number of slots and speed of machines

I have been asked this question in my homework.

My query is from Losses and Temperature Rise in division Design of Synchronous Machines of Design of Electrical Machines

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The correct answer is (d) slot opening, air gap length, number of slots and speed of machines

To elaborate: The pole face loss depends upon the slot opening and the air gap length. It also depends on the number of slots and speed of machines.

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