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What is the amplitude of rotating MMF produced as a result of m-phase currents flowing in m-phase windings? (where Fm is maximum MMF in any one phase, when current is maximum in that phase.)

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in Electrical Machines by (135k points)
What is the amplitude of rotating MMF produced as a result of m-phase currents flowing in m-phase windings? (where Fm is maximum MMF in any one phase, when current is maximum in that phase.)

(a) (2/m)Fm

(b) mFm

(c) (m/2)Fm

(d) Fm

I had been asked this question by my school principal while I was bunking the class.

My question is based upon Rotating Magnetic Field in portion Basic Concepts in Rotating Machines of Electrical Machines

1 Answer

+1 vote
by (888k points)
Correct option is (c) (m/2)Fm

To explain I would say: In general m phase current flowing in m phase winding results in rotating MMF wave of constant amplitude, equal to m/(2Fm).

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