Question

What is the reason behind armature structure for both DC and AC machines being laminated?

(a) reduce i^2R losses

(b) reduce the leakage flux

(c) reduce the eddy current losses

(d) for better operating power factor

I got this question in an interview for internship.

The origin of the question is Constructional Features of Rotating Electrical Machines-1 topic in chapter Constructional Features of Rotating Electrical Machines of Electrical Machines

Answer 1

Correct answer is (c) reduce the eddy current losses

To explain I would say: The armature windings of both the DC and AC machines have to deal with alternating current only; this is the reason why the armature structure of all rotating machines are laminated in order to reduce the eddy current losses.