Question

What is the formula for the harmonic poles due to slots?

(a) harmonic poles due to slots = 2 * (number of slots ± number of poles / 2)

(b) harmonic poles due to slots = 2 / (number of slots ± number of poles / 2)

(c) harmonic poles due to slots = 2 * (number of slots ± number of poles * 2)

(d) harmonic poles due to slots = 1/ 2 * (number of slots ± number of poles / 2)

The question was posed to me in a job interview.

The origin of the question is Design of Rotor in section Design of Single Phase Induction Motor of Design of Electrical Machines

Answer 1

Right choice is (a) harmonic poles due to slots = 2 * (number of slots ± number of poles / 2)

The best explanation: First the number of slots and number of poles are first calculated. On substitution we get the harmonic poles due to the slots.