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sukumar75
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Join Date: Oct 2009
Posts: 26
Good Answers: 1

Single Phase Motor Speed

12/18/2010 7:25 AM

Can I use N=120F/P formula to find out the single phase motor speed
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rudy.leurs
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Join Date: May 2007
Location: Flanders (Belgium)
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#1

Re: Single Phase Motor Speed

12/19/2010 9:23 AM

The correct formule is N [RPM] = 60 x Frequency [Hz] / the number of pool pairs.

But the formule N = 120F/P will also work if P= number of poles

exp : a 8 pole motor has 4 pole pairs and turns 750 RPM at 50 Hz

750 = 60 x 50 / 4 or 750 = 120 x 50 /8

The formule is correct for single and for 3 phase motors.
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sukumar75
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#2
In reply to #1

Re: Single Phase Motor Speed

12/20/2010 4:04 AM

Any specified reason we are using the constant value as 120 or 60
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sukumar75
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#3

Re: Single Phase Motor Speed

12/20/2010 4:05 AM

Any specified reason we are using the constant value as 120 or 60
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