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Synchronous Speed

Rotational speed of an AC motor field.

Formula

ns=120fPn_s = \frac{120 f}{P}

Variables

fFrequency
PNumber of poles

Example

60 Hz, 4 poles = 1800 rpm

Did You Know?

An AC motor's speed is locked to the grid's frequency, which is why clocks once kept time from the mains.

electrical