Question

What is pulsation losses?

(a) flux pulsations are caused due to the slotted armature

(b) flux pulsations are caused due to the rotation of machine

(c) flux pulsation occurs due to rotor slots are rotating

(d) flux pulsations occur due to the change in reluctance

I got this question during an internship interview.

The question is from Pulsation Losses & Types of Leakages topic in portion Principles of Magnetic Circuit Design of Design of Electrical Machines

Answer 1

The correct option is (d) flux pulsations occur due to the change in reluctance

The explanation: In the rotating electrical machine, the armatures are slotted and there is movement of rotor which leads to changes of local gap reluctance. This change leads to flux pulsations which causes additional losses called pulsating losses.