Question

Why is the stator core built up of laminations?

(a) to reduce core loss

(b) to reduce copper loss

(c) to reduce iron loss

(d) to reduce eddy current loss

I had been asked this question during an interview for a job.

My doubt is from Construction of Hydro-Generators in portion Design of Synchronous Machines of Design of Electrical Machines

Answer 1

The correct answer is (d) to reduce eddy current loss

Easiest explanation: The stator core is built up of laminations in order to reduce the eddy current loss. The loss in the laminated core is usually the single largest loss and hence the choice of type and grade of steel is of utmost importance.