Question

What is the relation between resistivity, magnetizing mmf and magnetizing current?

(a) high resistivity, low magnetizing mmf, high magnetizing current

(b) high resistivity, high magnetizing mmf, high magnetizing current

(c) low resistivity, high magnetizing mmf, high magnetizing current

(d) low resistivity, high magnetizing mmf, low magnetizing current

I had been asked this question by my college director while I was bunking the class.

My doubt is from Determination of Iron Losses & Slot Leakage in portion Principles of Magnetic Circuit Design of Design of Electrical Machines

Answer 1

Right option is (b) high resistivity, high magnetizing mmf, high magnetizing current

Best explanation: The high resistivity materials are made use of to reduce the eddy current loss. The high resistivity materials have high magnetizing mmf which in turn leads to high magnetizing current.