Question

What is the relationship between flux in the pole body and the useful flux per pole?

(a) flux in the pole body is directly proportional to useful flux per pole

(b) flux in the pole body is indirectly proportional to the useful flux per pole

(c) flux in the pole body is directly proportional to the square of useful flux per pole

(d) flux in the pole body is indirectly proportional to the square of useful flux per pole

I have been asked this question in unit test.

The query is from Pole Design topic in portion Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

Answer 1

Correct answer is (a) flux in the pole body is directly proportional to useful flux per pole

For explanation: According to the flux in the pole body formula the flux in the pole body is directly proportional to the useful flux per pole. It is also proportional to the leakage coefficient.