What is the synchronous speed of a 12‑pole, 60 Hz motor?

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Multiple Choice

What is the synchronous speed of a 12‑pole, 60 Hz motor?

Explanation:
Synchronous speed is the speed at which the stator’s magnetic field rotates, determined by the supply frequency and the number of poles. It’s found with the formula Ns = 120 f / P. Here, f is 60 Hz and P is 12. So Ns = 120 × 60 / 12 = 600 rpm. This is the speed at which the magnetic field turns; the rotor in a practical induction motor runs a bit slower than this due to slip, depending on the load. For context, different pole counts at 60 Hz yield different synchronous speeds—fewer poles means faster synchronous speed, more poles means slower.

Synchronous speed is the speed at which the stator’s magnetic field rotates, determined by the supply frequency and the number of poles. It’s found with the formula Ns = 120 f / P.

Here, f is 60 Hz and P is 12. So Ns = 120 × 60 / 12 = 600 rpm. This is the speed at which the magnetic field turns; the rotor in a practical induction motor runs a bit slower than this due to slip, depending on the load.

For context, different pole counts at 60 Hz yield different synchronous speeds—fewer poles means faster synchronous speed, more poles means slower.

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