Question

The armature of DC motor is laminated to ____________

(a) To reduce mass

(b) To reduce hysteresis loss

(c) To reduce eddy current loss

(d) To reduce inductance

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

I want to ask this question from Construction in portion DC Machines of DC Machines

Answer 1

Correct answer is (c) To reduce eddy current loss

Easiest explanation: The armature is built up in a cylindrical or drum shape high grade silicon steel in form of lamination. By using laminations, the circular path of eddy currents is terminated. Hence heating and ultimately damage to the armature can be reduced by lamination.