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The relative speed between the stator magnetic field and rotor in the synchronous generator is ______

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The relative speed between the stator magnetic field and rotor in the synchronous generator is ______

(a) Ns

(b) Ns-Nr

(c) Ns+Nr

(d) 0

I have been asked this question in homework.

This intriguing question originated from Induction Motors topic in chapter Braking of DC Motors & Induction Motors of Electric Drives

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Right option is (d) 0

The explanation is: In synchronous generator rotor and stator magnetic field rotates at speed of synchronous speed in order to produce the steady state torque.

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