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Synchronous Speed When Alternating current (AC) is applied to the stator of a three phase motor, a rotating magnetic field is setup. This rotating magnetic field moves with a speed called synchronous speed. The Synchronous speed can be calculated as follows: 120 times the frequency (F), divided by the number of poles (P): The synchronous speed decreases as the number of poles increases. The table below shows the synchronous speed associated with various numbers of poles at supply frequencies of 50Hz and 60Hz: Rated Speed. The speed of operation of an AC motor when fully loaded at rated voltage is called the rated speed.
The Quick and Easy Answer. 1  Divide MPH by 2, then multiply by 3 to find FPS. 2  1. First, you must convert MPH to MPM (minute) by dividing MPH by 60. 3  2. Second, convert miles to feet. 4  3. Convert FPM to FPS by dividing by 60. 5  Quick way to find the reverse, i.e. convert from fps to mph: 6  Divide FPS by 3 and then multiply by 2 to get MPH.