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A uniformly distributed winding on the stator has three full pitched coils, each coil having N turns and each turn carrying a current i. The MMF produced by the winding is?

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A uniformly distributed winding on the stator has three full pitched coils, each coil having N turns and each turn carrying a current i. The MMF produced by the winding is?

(a) sinusoidal in waveform with an amplitude 3Ni

(b) sinusoidal in waveform with an amplitude 3Ni/2

(c) trapezoidal in waveform with an amplitude of 3Ni

(d) trapezoidal in waveform with an amplitude of 3Ni/2

This question was addressed to me by my school teacher while I was bunking the class.

My question comes from MMF Produced by Distributed Windings topic in portion Synchronous Machines of Electrical Machines

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The correct choice is (d) trapezoidal in waveform with an amplitude of 3Ni/2

Best explanation: When the machine has more than 3 slots per pole per phase, the steps in the MMF wave are neglected and MMF variation is taken as smooth over these slots and as a consequence, stepped MMf wave changes to trapezoidal MMF wave. The trapezoidal MMF wave amplitude = 3Ni/2.

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