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In a DC machine, the form of armature mmf waveform is __________

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In a DC machine, the form of armature mmf waveform is __________

(a) Triangular

(b) Sinusoidal

(c) Saw tooth

(d) Rectangular

The question was posed to me at a job interview.

The question is from Armature Reaction -1 topic in portion Armature Reaction of DC Machines

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Correct choice is (a) Triangular

Explanation: All the conductors on the armature periphery between adjacent brushes carry currents (of constant value, UNcIc) in one direction and the current distribution alternates along the periphery. Because of commutator action, armature current distribution is in the steps of UNcIc. Thus, mmf waveform can be generalized by joining peak points to get triangular wave.

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