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

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

(a) Nr

(b) Ns-Nr

(c) Ns+Nr

(d) 0

This question was posed to me during an online exam.

I want to ask this question from Induction Motors topic in division Braking of DC Motors & Induction Motors of Electric Drives

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Best answer
Right choice is (a) 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 remains at rest. The relative speed is Nr-0=Nr.

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