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If F1 is the constant amplitude of fundamental rotating MMF wave, the space harmonics of order 6K+1 (where K=1,2,3….), the harmonic MMF wave is of _____________

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If F1 is the constant amplitude of fundamental rotating MMF wave, the space harmonics of order 6K+1 (where K=1,2,3….), the harmonic MMF wave is of _____________

(a) Constant amplitude and stationary in space

(b) Constant amplitude and rotates along F1

(c) Varying amplitude and rotates along F1

(d) Constant amplitude and rotates against F1

I had been asked this question during an online interview.

The doubt is from Rotating Magnetic Field topic in portion Basic Concepts in Rotating Machines of Electrical Machines

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Right option is (b) Constant amplitude and rotates along F1

Easiest explanation: Space harmonics of the order of 6K+1(7,13,19,…) have their constant amplitude equal to 1/(6K+1)F1 and rotate in the direction of fundamental component F1 at a speed of 1/(6K+1) of the fundamental synchronous speed.

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