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Motor Frequency and Speed (RPM)

The speed of the AC motor is determined primarily by the frequency of the AC supply and the number of poles in the stator winding, according to the relation: RPM = 2 * F * 60/p where RPM = (Synchronous) Revolutions per minute F = AC power frequency p = Number of poles, usually an even number but always a multiple of the number of phases.

You can easily see that by reducing the frequency in the previous formula you also reduce the speed or RPM





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