Question

What is the formula for the area of the poles shrank of the laminated poles?

(a) area of the pole shrank = flux in the pole body * magnetic field

(b) area of the pole shrank = flux in the pole body + magnetic field

(c) area of the pole shrank = flux in the pole body – magnetic field

(d) area of the pole shrank = flux in the pole body / magnetic field

This question was posed to me in class test.

This intriguing question originated from Pole Design in portion Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

Answer 1

Correct choice is (a) area of the pole shrank = flux in the pole body * magnetic field

For explanation: For finding out the area of the pole shrank first the flux in the pole body is found out using the product of the leakage coefficient and the useful flux in the pole. Next, the magnetic field is measured and the product gives the area.