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What is the speed of the 11^th order harmonics in the induction motor?

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What is the speed of the 11^th order harmonics in the induction motor?

(a) Ns

(b) Ns/11

(c) 2×Ns

(d) Nr

The question was posed to me during an online interview.

The query is from Induction Motors topic in portion Braking of DC Motors & Induction Motors of Electric Drives

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The correct answer is (b) Ns/11

The best explanation: The speed of the 6k±1 is Ns÷6k±1. The speed of the 11^th order time harmonics in the induction motor is Ns/11.

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