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If φm is the maximum value of flux due to any one phase, then resultant flux in 2 phase and 3 phase AC machines would respectively be given by _________

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If φm is the maximum value of flux due to any one phase, then resultant flux in 2 phase and 3 phase AC machines would respectively be given by _________

(a) φm and 1.5φm, both rotating

(b) φm and 1.5φm, both stand still

(c) φm stand still and 1.5φm rotating

(d) 1.5φm and 2φm, both rotating

The question was posed to me in an interview for internship.

This question is from Rotating Magnetic Field topic in section Basic Concepts in Rotating Machines of Electrical Machines

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Right choice is (a) φm and 1.5φm, both rotating

Easy explanation: In a 2 phase and 3 phase AC machine, rotating MMF is produced with magnitudes of φm and 3/2φm.

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