Question

What is the formula of the permeance of the strip in the conductor portion?

(a) permeance of the strip = permeability in air * area of the flux path * length of flux path

(b) permeance of the strip = permeability in air / area of the flux path * length of flux path

(c) permeance of the strip = permeability in air * area of the flux path / length of flux path

(d) permeance of the strip =1 / permeability in air * area of the flux path * length of flux path

This question was addressed to me during an interview.

My question comes from Determination of Iron Losses & Slot Leakage in section Principles of Magnetic Circuit Design of Design of Electrical Machines

Answer 1

Right answer is (c) permeance of the strip = permeability in air * area of the flux path / length of flux path

For explanation I would say: The permeability in air, area of the flux path and the length of flux path is first calculated. On substitution, the permeance of the strip is obtained.