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

Digital control system, block diagram of digital control system and explain...

block diagram of digital control system and explain each block

Motor control , Normal 0 false false false EN-IN X-NO...

Normal 0 false false false EN-IN X-NONE X-NONE MOTOR CONTROL

Write discussion on Construction and working of analog type, Write discussi...

Write discussion on Construction and working of analog type storage oscilloscope

Performance mapping & implementation plan - power supply, Importance Perfor...

Importance Performance Mapping & Implementation Plan - Power Supply Another data presentation device in which several managers find appealing is the significance-performance m

Diodes, How does a diode work! what is its main formulas?

How does a diode work! what is its main formulas?

Show the r-1s complement, Q. Show the r-1s Complement? Subtract eve...

Q. Show the r-1s Complement? Subtract every digit of the number from r-1 (the radix of the system - 1)ex.             952 10

#titleclipper diode.., Ask quedisadvantages stion #Minimum 100 words accept...

Ask quedisadvantages stion #Minimum 100 words accepted#

Compare the merits and demerits of analog voltmeters, Question : (a)(1)...

Question : (a)(1) Show different types of voltmeters commonly used. (2) A basic d'Arsonval meter movement with an internal resistance Rm = 100 ?,and a full scale current of

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