D.c. generator, Electrical Engineering

Assignment Help:

D.C. Generator

250_DC generator.png

A magnetic field is produced by afield coil supplied with a D.C. current and a rotor is placed between shaped pole pieces and wound with an armature winding. The diagram above shows only one turn of the armature winding, but in practice there will usually be more than one. The ends of the armature winding are connected to two slip rings that rotate with the armature and the voltage generated is 'picked off' the rings by brushes that bear against the slip rings

 

690_brushes , rings armature winding , rotor.png

The emf generated may be calculated either using the equation for the emf induced in a conductor of length l moving

in an electric field of flux density B webers/m 2

e=B.l.v

with a velocity v m/sec or by considering the rate of change of flux linkage with the armature coil. We shall use the latter method. Due to the shaping of the pole pieces, the flux threading through a particular armature  coil  is  constant  at  +  max   as  it turns from O4   to  O1 and decreases linearly from max  to  min  while  the  rotor  is turning from  O1 to O2 . It is constant again during O2 to   O3 and then increases linearly during  O3to O4. (ref graph)

 

1313_D.C. Generator 1.png


Related Discussions:- D.c. generator

Explain assume assembler directive, Explain the ASSUME assembler dire...

Explain the ASSUME assembler directive with example ASSUME: It will be used to map the segment register names along with memory addresses. The Syntax is as g

Working principle of ultrasonic machine, Illustrate the working principle, ...

Illustrate the working principle, equipment used,process characteristic, advantage and disadvantage of water jet machine (WJM) (a) Illustrtae the working principle of ultrasonic

P-n junction, P-N Junction   A p-n junction is made by joining P-ty...

P-N Junction   A p-n junction is made by joining P-type and N-type semiconductors together in extremely close contact. The word junction consider to the boundary interface

Mode 1 - buck converter , Mode 1 ( 0 By  applying a positive  output ...

Mode 1 ( 0 By  applying a positive  output  pulse  of the pulse  width modulator to  the  transistor Q 1 it gets turned on.  An input  current  in flows  through V in   Q 1

Digital electronic, What are the advantages of wired-AND connection of digi...

What are the advantages of wired-AND connection of digital IC

Compare memory mapped i/o with i/o mapped i/o, Compare memory mapped I/O wi...

Compare memory mapped I/O with I/O mapped I/O. Memory Mapped I/O Scheme: In this type of scheme there is merely one address space. These address space is explained as all p

Compute the ensemble mean and standard deviation, Write three m ?les to gen...

Write three m ?les to generate M ensemble members of length N, for the following three random processes: i) function v=rp1(M,N); a=0.02; b=5; Mc=ones(M,1)*b*sin((1:N)*p

Weins bridge oscillator, please give me the ckt for wein bridge oscillator ...

please give me the ckt for wein bridge oscillator with 5KHz frequency using transister (with exact values of resistor and capacitor).

Features hindering developing countries from growing faster, Q. Describe so...

Q. Describe some of the features hindering developing countries from growing faster. Answer: One of the features that are able to be hold developing countries from growing fas

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd