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

Clipper and clamper circuit, Clipper Circuits: Clipper circuit have ab...

Clipper Circuits: Clipper circuit have ability to Clipper of portions of the input signals without distorting the remaining part of the alternating wave form. Clamper net

Define some applications of digital counters, Define some Applications of D...

Define some Applications of Digital Counters? Digital counters are extremely useful in many applications. They can be effortlessly found in digital clocks and parallel-to-seri

Create a time diagram - conveyer, When the PLC is in the RUN mode it will s...

When the PLC is in the RUN mode it will switch ON the conveyer so it will run continuously. This project is divided into four outcomes: (a)    Detect block on entry, close

Peak inverse voltage - thyristor, Peak inverse Voltage   Peak  inverse v...

Peak inverse Voltage   Peak  inverse voltage is   important parameter in the design of rectifier circuit. PIV is the maximum  voltage that appears across the device  during its

Analyse the characteristics of a dc machine, Theoretical calculations T...

Theoretical calculations The characteristics of the d.c. machine you will be investigating are given on the last page of this part. Use 200V DC supply for both armature and fie

Dc link scherbius drive - motor control , DC Link Scherbius Drive This ...

DC Link Scherbius Drive This type of scheme is shown in figure. This circuit  allows both  sub synchronous  and super synchronous speed control. In case  of sub synchronous spe

Determine the transfer function and driving-point impedance, Q. A filter is...

Q. A filter is a network employed to select one range of frequencies while rejecting all other frequencies. A basic building block often used in integrated-circuit filters is shown

Calculate the induced voltage at full load, A 100-kW, 230-V shunt generator...

A 100-kW, 230-V shunt generator has R a = 0.05  and R f = 57.5 . If the generator operates at rated voltage, calculate the induced voltage at (a) full load, and (b) one-half fu

Induction motor, A very widely used alternative form of synchronous motor i...

A very widely used alternative form of synchronous motor is the  ' indu c tion motor'. This has the advantage that it does not require an auxiliary motor to run the rotor up t

Drift current and diffusion current, Drift Current and Diffusion Current : ...

Drift Current and Diffusion Current : There are two mechanisms in which electrons and holes move through a semiconductor. One of these is termed as drift and other is diffusi

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