EMF Equation of an Alternator
Change of Flux in one revolution = p x Φ
Time taken for one revolution = 60/Ns seconds.
Hence eavg = (p x Φ ) / ( 60/Ns) = p x Φ x Ns / 60
We know f = PNs /120
hence PNs /60 = 2f
Hence eavg = 2 Φ f volts
Hence average emf per turn = 2 x 2 Φ f volts = 4Φf volts
If there are Tph, number of turns per phase connected in series, then average emf induced in Tph turns is
= 1.11 x 4 Φ f Tph volts
= 4.44 f Φ Tph volts
Eph,avg= 4.44 f Φ Tph volts
***If we assume effect of
Kd= Distribution factor
Kc or KP = Cos α/2 . This is pitch factor.
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