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If F1 is the constant amplitude of fundamental rotating MMF wave, the for 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 for 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

The question was asked in unit test.

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

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Correct choice is (b) Constant amplitude and rotates along F1

Explanation: Space harmonics of the order of 6K-1(5,11,17,…) 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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