DC GENERATOR EMF EQUATION
DC GENERATOR EMF EQUATION
Let
Φ = flux/pole in weber
Z = total number of armture conductors = No.of slots x No.of conductors/slot
P = No.of generator poles
A = No.of parallel paths in armature
N = armature rotation in revolutions per minute (r.p.m) E = emf induced in any parallel path in armature
Generated emf Eg = emf generated in any one of the parallel paths i.e E. Average emf geneated /conductor = dΦ/dt volt (n=1)
Now, flux cut/conductor in one revolution dΦ = ΦP Wb No.of revolutions/second = N/60
Time for one revolution, dt = 60/N second
Hence, according to Faraday’s Laws of Electroagnetic Induction,
EMF generated/conductor is For a simplex wave-wound generator
No.of parallel paths = 2
No.of conductors (in series) in one path = Z/2
EMF generated/path is
For a simplex lap-wound generator
No.of parallel paths = P
No.of conductors (in series) in one path = Z/P
EMF generated/path
In general generated emf
where A = 2 for simplex wave-winding A = P for simplex lap-winding
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