Chapter: Basic Electrical and electronics - Electrical Mechanics

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DC Generator E.M.F Equation

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

DC GENERATOR E.M.F 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 = e.m.f induced in any parallel path in armature

 

Generated e.m.f Eg = e.m.f generated in any one of the parallel paths i.e E. Average e.m.f 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,

 

E.M.F generated/conductor is

 


For a simplex wave-wound generator

No.of parallel paths = 2

 

No.of conductors (in series) in one path = Z/2

E.M.F. generated/path is


For a simplex lap-wound generator

No.of parallel paths = P

 

No.of conductors (in series) in one path = Z/P

E.M.F.generated/path


In general generated e.m.f


where A = 2 for simplex wave-winding A = P for simplex lap-winding

  

PRINCIPLE OF OPERATION

 

DC generator converts mechanical energy into electrical energy. when a conductor move in a magnetic field in such a way conductors cuts across a magnetic flux of lines and emf produces in a generator and it is defined by faradays law of electromagnetic induction emf causes current to flow if the conductor circuit is closed.


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