E.M.F. EQUATION FOR DC GENERATORS:

Let


Number of poles = P

      Flux per pole = Φ Webers

     Total number of conductors = Z

  Speed of rotation of armature = N turns

          Number of parallel paths = A


According to Faraday’s Law of electromagnetic induction, average emf induced in each conductor is equal to the rate of change of flux in webers per second.


In one revolution flux cut by each armature conductor,

Time taken by armature to complete one revolution

                dt = 60/N seconds

Therefore, emf induced in each conductor = dΦ / dt = ΦPN / 60 volts 
Number of armature conductors -

connected in series in each parallel path = Z/A

Therefore emf induced in dc generator E = emf induced in each conductor
     x number of parallel path

E.M.F. induced in dc generator E = ΦP(N / 60) x Z / A volts

Number of parallel paths of wave winding = 2

Number of parallel paths of lap winding = number of poles (P) for lap Winding


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