E.M.F. Equation & Armature Resistance of a D.C. Generator

We shall now derive an expression for the e.m.f. generated in a d.c. generator.

Let

Ø= flux/pole in Wb
Z = total number of armature conductors
P = number of poles
A = number of parallel paths = 2 … for wave winding
= P … for lap winding
N = speed of armature in r.p.m.
Eg= e.m.f. of the generator = e.m.f./parallel path

Armature Resistance (Ra)
The resistance offered by the armature circuit is known as armature resistance (Ra) and includes:
(i) resistance of armature winding
(ii) resistance of brushes
The armature resistance depends upon the construction of machine. Except for small machines, its value is generally less than 1Ω.

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Written by arjun on May 6th, 2009 with 7 comments.
Read more articles on Direct Current Machines and Electrical Machines.

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7 comments

Read the comments left by other users below, or:

Get your own gravatar by visiting gravatar.com aman tiwari
#1. May 11th, 2009, at 5:30 AM.

write detail note on torqe eqation

Get your own gravatar by visiting gravatar.com skapandey
#2. November 20th, 2009, at 12:56 AM.

i want amf panel

Get your own gravatar by visiting gravatar.com M. Rajesh
#3. December 15th, 2009, at 9:09 AM.

Dear sir,

Please brief about permanent magnent generator – reactive power.

Get your own gravatar by visiting gravatar.com haider zia
#4. December 29th, 2009, at 3:07 AM.

thanx alot…it was really helpful in writing my assignment…

Get your own gravatar by visiting gravatar.com manikanta
#5. May 3rd, 2010, at 1:02 AM.

i wan to knw detail note about torque

Get your own gravatar by visiting gravatar.com manikanta
#6. May 3rd, 2010, at 1:02 AM.

i wan to knw torque equation sir

Get your own gravatar by visiting gravatar.com nwama ernest
#7. August 7th, 2011, at 12:54 PM.

thanks so very much sir, this really helped, a lot, mostly in my assingment

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