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Which of the following statements are correct regarding individual phase MMF in rotating machines?

(a) It is a rotating MMF wave

(b) It is not a rotating MMF wave and its amplitude doesn’t alternate along its own phase axis

(c) It is not a rotating MMF wave but its amplitude merely pulsates

(d) None of the mentioned

I have been asked this question in my homework.

My question comes from Rotating Magnetic Field in section Basic Concepts in Rotating Machines of Electrical Machines

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Correct choice is (c) It is not a rotating MMF wave but its amplitude merely pulsates

For explanation I would say: It should be remembered that individual phase MMF is not a rotating MMF wave, its amplitude merely pulsates or alternates along its own phase axis.

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