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What is the speed of the 6^th order time harmonics in the induction motor?

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What is the speed of the 6^th order time harmonics in the induction motor?

(a) Ns

(b) Ns/6

(c) 6×Ns

(d) 0

I got this question in unit test.

I would like to ask this question from Induction Motors topic in chapter Braking of DC Motors & Induction Motors of Electric Drives

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The correct option is (c) 6×Ns

The explanation: The time harmonics are present in the supply voltage. The speed of the 6^th order time harmonics in the induction motor is Ns/6.

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