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how many poles does 3 phase, 60 hertz induction motor which runs at 715 r/min at no load and at 670 r/min at full load have and how is it calculated?
Calculating Poles in a 3-Phase Induction Motor
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From..
http://www.precision-elec.com/faq-vfd-how-do-i-calculate-rpm-for-three-phase-induction-motors/
RPM = (120 * Freq) /N
where N = Number of poles
So
N = (120 * Freq)/715
= (120 * 60)/715
= 10
Edit: Actually 10 poles gives 720 rpm.
The slip % is
((Synchronous Speed – Rated Full Load Speed) / (Synchronous Speed)) * 100%
(715-670)*100/715 = 6.3%
http://www.precision-elec.com/faq-vfd-how-do-i-calculate-rpm-for-three-phase-induction-motors/
RPM = (120 * Freq) /N
where N = Number of poles
So
N = (120 * Freq)/715
= (120 * 60)/715
= 10
Edit: Actually 10 poles gives 720 rpm.
The slip % is
((Synchronous Speed – Rated Full Load Speed) / (Synchronous Speed)) * 100%
(715-670)*100/715 = 6.3%
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