Question

A 3 phase induction motor is wound for 4 poles and is supplied from 50 Hz system.
Calculate (i) Synchronous speed (ii) rotor speed when slip is 4% (iii) rotor frequency
when rotor runs at 600 rpm.

Answer 1

Explanation:

The synchronous speed of an induction motor can be given as,

Where ‘Ns’ is the synchronous speed in rpm, ‘f’ is the frequency in hertz and ‘p’ is no of poles.

Hence, according to given data it will be,

The synchronous speed is directly proportional to frequency and inversely proportional to no of pole. If you decrease the no of pole the synchronous speed will increase. Lets say in your case if we decrease no of poles to 2, then the synchronous speed will be 3000 rpm.

Hope you get the answer

Answer 2

Answer:

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Explanation:

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