Question

Which of the following harmonics are present in the resultant MMF produced by 3 phase currents flowing in the 3 phase windings?

(a) Triplen harmonics (3K), where K is an integer

(b) 6K+1 harmonics only, where K is an integer

(c) 6K-1 harmonics only, where K is an integer

(d) 6k+1 and 6K-1 harmonics, where K is an integer

I had been asked this question in an online quiz.

I'd like to ask this question from Rotating Magnetic Field topic in division Basic Concepts in Rotating Machines of Electrical Machines

Answer 1

Right option is (d) 6k+1 and 6K-1 harmonics, where K is an integer

For explanation: Space harmonics of the order 3,9,15,… i.e, triplen harmonics are absent.