Question

What is the range of the flux density in the pole shrank for laminated poles?

(a) 1.1-1.7 Wb per m^2

(b) 1.2-1.6 Wb per m^2

(c) 1.3-1.7 Wb per m^2

(d) 1.2-1.7 Wb per m^2

The question was posed to me in an internship interview.

My doubt is from Pole Design in chapter Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

Answer 1

Right choice is (d) 1.2-1.7 Wb per m^2

To elaborate: The flux density in the pole shrank of laminated poles should have a minimum value of 1.2. The flux density in the pole shrank of the laminated poles should not exceed 1.7 at the same time.