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

Show function of compensating plate in interferometer, Q. Show Function of ...

Q. Show Function of Compensating Plate in interferometer? In absence of plate G2 the reflected ray passes the plate G1 twice, whereas the transmitted ray does not passes even o

Use mesh analysis and nodal analysis to determine current, Q. Use (a) mesh ...

Q. Use (a) mesh analysis and (b) nodal analysis to determine the current through the 4-resistor of the circuit of Figure.

Determine the resultant line current and power factor, Q. A three-phase loa...

Q. A three-phase load, connected to a 440-V bus, draws 120 kWat a power factor of 0.85 lagging. In parallel with this load is a three-phase capacitor bank that is rated 50 kVAR . D

Which Transistor configuration best to use in cascade, Q. Which of the 3 tr...

Q. Which of the 3 transistor configuration is best to use in cascade if maximum voltage gain is to be realized?  The common collector configuration is not used for intermediate

Methods of material handling, Q. Show the Methods of material handling? ...

Q. Show the Methods of material handling? Methods of material handling during operations and maintenance activities shall be considered for all facilities to ensure that the fi

Alternater, if the prime mover input of an alternater connected directly t...

if the prime mover input of an alternater connected directly to an infinite bus in increased,then its?

Dc machines, commutator in d.c machine acts as... what????

commutator in d.c machine acts as... what????

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

Compare in-channel signalling with common channel signalling, Q. Compare in...

Q. Compare in-channel signalling with common channel signalling? Network wide signalling also involves end to end signalling between originating exchange and the terminating ex

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