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The number of poles in a motor will determine the speed of that motor. n=speed, f=frequency, p=# of poles. n=(120f)/p

So a 6 pole motor is rated to operate at n=(120*60)/6=1200 rpm. assuming 60Hz frequency

Or a 8 pole motor is rated to operate at 900 rpm.

Of course due to slip the rotor will always spin slightly slower.

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