1.

What is emf equation of alternator? 

Answer»

Emf = 4.44 kc kd f ∅ T volts.

Kd = Distribution factor = sin m β/2 / m sin β/2

kc/kp = Coil span factor /Pitch factor = cos α/2 

kf = Form factor = 1.11

∴Average emf induced / Cycle = ∅ N P/ 60 

= ∅ P ∗120 f /  60 * P

=2 f ∅ volt

If Z is the number of conductors = 2T (T = two sides of conductor) 

 emf induced = 2 f ∅ Z =2 f ∅ 2T = 4 f ∅ T

∴ RMS value of emf induced = form factor * emf

= 1.11 * 4 f ∅ T

= 4.44 f ∅ T volts. 



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