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.

Share and Enjoy:
  • email
  • Print
  • Digg
  • Sphinn
  • del.icio.us
  • Facebook
  • Mixx
  • Google Bookmarks
  • blogmarks
  • Gwar
  • LinkArena
  • LinkedIn
  • Live
  • muti
  • MySpace
  • NewsVine
  • Ping.fm
  • Reddit
  • SphereIt
  • StumbleUpon
  • Technorati
  • Yahoo! Buzz
  • Add to favorites
  • Orkut
  • PDF

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

Related articles

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

Leave your comment...

If you want to leave your comment on this article, simply fill out the next form:




You can use these XHTML tags: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong> .