Question

How should the number of slots be in the case of fractional slot windings?

(a) multiples of slots

(b) multiple of phases

(c) multiple of phases and pair of poles

(d) multiples of pair of poles

I had been asked this question in an interview for internship.

I want to ask this question from Design of Wound Rotor topic in division Three Phase Induction Motor of Design of Electrical Machines

Answer 1

The correct answer is (c) multiple of phases and pair of poles

For explanation: Fractional slot windings can be used in the wound rotor design. It is preferable to use a number of slots which are a multiple of phases and pair of poles in the case of fractional slot windings.