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The relative speed between the stator magnetic field and rotor in the induction motor is ______

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The relative speed between the stator magnetic field and rotor in the induction motor is ______

(a) Ns

(b) Ns-Nr

(c) Ns+Nr

(d) 0

This question was addressed to me in exam.

The above asked question is from Induction Motors topic in portion Braking of DC Motors & Induction Motors of Electric Drives

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Best answer
The correct option is (b) Ns-Nr

Explanation: In induction motor rotor tries to catch up the stator magnetic field in order to satisfy Lenz law. Effect opposes the cause. Stator magnetic field rotates at the speed of synchronous speed.

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