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To calculate the number of motor poles, you can use the formula: ( P = \frac{120 \times f}{N} ), where ( P ) is the number of poles, ( f ) is the frequency in hertz, and ( N ) is the motor speed in revolutions per minute (RPM). Rearranging the formula allows you to find the number of poles if you have the frequency and RPM. For example, if a motor runs at 1800 RPM on a 60 Hz supply, the calculation would be ( P = \frac{120 \times 60}{1800} = 4 ) poles.

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2w ago

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Name plate data should indicate the number of poles / RPM. For speed N= (120 x Frequency) / Number of poles Using this formula you can find out the number of poles, provided you have other parameters available. If no data is available, run the motor on no load, and measure the rpm, know the frequency, calculate the poles.


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The number of poles in a 1200 RPM AC motor can be determined using the formula: RPM = (120 × Frequency) / Number of Poles. For a standard frequency of 60 Hz, the equation rearranges to Number of Poles = (120 × 60) / 1200, which results in 6 poles. Therefore, a 1200 RPM AC motor typically has 6 poles.


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