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

Need for modulation recognition - software defined radio, Need for Modulati...

Need for Modulation Recognition There are so many communication signals all available with different types of modulation and different frequencies. It is necessary to identify

Transformer box, a) Illustrate the Schematic diagram of the Transformer Box...

a) Illustrate the Schematic diagram of the Transformer Box used in the Practical Session b)  Calculate the output voltage on an Oscilloscope and determine its amplitude and freq

Explain loads - generation and absorption of reactive power, Explain Loads ...

Explain Loads - Generation and Absorption of Reactive Power A load at 0.95 power factor implies a reactive power demand of 0.33 kVAr per kW of power. When planning a network, i

What is photovoltaics?, Photovoltaics  is a high-technology approach  to ch...

Photovoltaics  is a high-technology approach  to changing sunlight  directly  into  electrical  energy.  The  electricity  is direct  current  and  can  be  used  that  way,  chnag

., speed control of single phase ac motors

speed control of single phase ac motors

What is a bode plot and what are i''s uses, Q. (i) What are the different t...

Q. (i) What are the different types of plots for frequency response in an RC coupled amplifier?     (ii) What is a Bode Plot? What are it's uses? The different types of

Comparison of analog-modulation systems, Comparison of Analog-Modulation Sy...

Comparison of Analog-Modulation Systems The comparison of analog modulation systems (conventional AM, DSB SC, SSB SC, VSB, FM, and PM) can be based on three practical criteria:

Disadvantages - high level languages, Disadvantage - High  level  Langua...

Disadvantage - High  level  Languages a.Computational time is more as compared to  machine languages. b.Requires more  memory. c.Requires the knowledge of specific rules

Explain the configuration of a step-by-step switching system, With neat dia...

With neat diagrams explain the configuration of a step-by-step switching system. Schematic diagram for such an exchange is given in Figure.  Every subscriber is connected to a

What is the function of 8254 programmable interval timer, What is the funct...

What is the function of 8254 Programmable Interval Timer? 8253 or 8254 Timer Description and Initialization PTI that is programmable Interval Timer/Counter) 8253

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