Expression for generated emf in a dc generator, Electrical Engineering

Assignment Help:

Q. Derive the expression for generated emf in a dc generator.

Ans.

Expression for Generated emf in a DC Generator

 

             We shall now derive an expression for the emf generated in a d.c. generator.

 

                   Let Φ    = flux/pole in Wb

 

                          Z    = total no. of armature conductors

 

                          P    = no. of poles

 

                          A   = no. 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

 

             Flux cut by one conductor in one revolution of the armature, dΦ = pΦ webers

 

                     Time taken to complete one revolution,

 

                           dt = 60/n sec.

 

                    e.m.f. generated/conductor  dΦ/dt =  PΦ/60/N = PΦN/60 volts

 

                    e.m.f. generator, Eg = e.m.f. per parallel path

 

                                  = (e.m.f/conductor) × No. of conductor in series per parallel path

 

                                  =   PΦN/60 × Z/A

 

                          Eg    =   PΦZN/60A

 

                        A       = Z...for wave winding

 

                                  = P....for lap winding


Related Discussions:- Expression for generated emf in a dc generator

Limitor, What is limitor.. how it works

What is limitor.. how it works

Need of microphone in telephone hand set, Q. Need of Microphone in telephon...

Q. Need of Microphone in telephone hand set? Microphone: For all practical purposes, microphone is transmitter for telephone. The microphone converts acoustical signals in the

Determine the current through the coil, Solenoids find application in a var...

Solenoids find application in a variety of electrically controlled valves. The magnetic structure shown in Figure is a simplified representation of a solenoid in which the flux in

Intrinsic semiconductor, Draw a graph illustrating how resistivity varies w...

Draw a graph illustrating how resistivity varies with temperature for an intrinsic semiconductor. b) Gallium nitride, GaN, has an energy gap of 3.36 eV at 300 K. Calculate the w

Magnetic permeability and the definition of the amp, The ampere has been de...

The ampere has been defined (by the International Committee of Weights and Measures in 1946) as the current flowing in two long parallel wires 1 metre apart that produces a force o

Sinusoidal expression for the current, The voltage across a 1 - μF capaci...

The voltage across a 1 - μF capacitor is given. Which is the sinusoidal expression for the current? a) 30 sin200t b) 70cos (800t - 20°) At what frequency will the re

Form factor, Significance of form factor,why we decide the power handing ca...

Significance of form factor,why we decide the power handing capacity in transmission with the help of form factor?

Competition and non-conventional energy, Competition and Non-conventional e...

Competition and Non-conventional energy: Competition: The tariff policy bolsters competition through making it mandatory for a distribution licensee to procure power by

Generation of wide-band fm, Generation ofwide-band FM can be done by vario...

Generation ofwide-band FM can be done by variousmeans.However, only themost common and conceptually the simplest one, known as the direct method, is considered here. It employs a

Show the interconnections and appropriate polarity markings, Q. Two 1150:11...

Q. Two 1150:115-V transformers are to be inter connected for (a) 2300:230-V operation, and (b) 1150:230-V operation. Show the interconnections and appropriate polarity markings.

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