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

Assigment, what is p-n junction and how its work

what is p-n junction and how its work

Excess3 to bcd code converter using nand gates, design a excess3 to bcd cod...

design a excess3 to bcd code converter using only nand gates

100 line exchange with two-motion line finders, In this design, there are 2...

In this design, there are 24 line finders. If any of the 100 subscribers has to get access to any of 24 two-motion selectors, it is necessary that every line finder is capable of r

Find the truth table and the type of gate, Q. The DeMorgan's theorems sugge...

Q. The DeMorgan's theorems suggest that the basic logic operations can be realized by use of inverters and NAND gates only. For the circuits shown in Figure,  find the truth table,

Industrial Automation, 1. Write the Boolean expression and draw the gate lo...

1. Write the Boolean expression and draw the gate logic diagram and typical PLC ladder logic diagram for a control system wherein a fan is to run only when all of the following con

Effect of power factor correction capacitors, For a 50kW three phase rectif...

For a 50kW three phase rectifier connected at 415 V to a point of common coupling with a short circuit capacity 500kVA modelled as an inductive source, design filters to make the s

Voltage quadrupler, Voltage Quadrupler : A voltage quadrupler circuit is s...

Voltage Quadrupler : A voltage quadrupler circuit is shown in fig. which provides output voltage V0 = 4 Vm. Operation : Capacitor C 1 , C 2 and C 3 charges to Vm, 2Vm and 2Vm

What are plastics, What are plastics? Plastics are materials (containi...

What are plastics? Plastics are materials (containing carbon as common element) that have organic substances of high molecular weight and are able of being formed in required

Define the binary counting - counters, Define the Binary Counting - Counter...

Define the Binary Counting - Counters? The Binary counter is capable to be constructed from J-K flip-flops by taking the output of one cell to the clock input of the next The J

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