Working of self - excited generators, Electrical Engineering

Assignment Help:

Q. Working of self - excited generators?

For self-excited generators, residual magnetism must be present in the ferromagnetic circuit of the machine in order to start the self-excitation process. For a dc generator, the relationship between steady-state generated emf Ea and the terminal voltage Vt is given by

where Ia is the armature current output, and Ra is the armature circuit resistance. For a dc motor, the relationship is given by


Vt = Ea + Ia Ra

where Ia is now the armature current input. Under steady-state conditions, volt-ampere characteristic curves are of interest for dc generators, and speed-torque characteristics are of interest for dc motors. Depending on the method of excitation of the field windings, a wide variety of operating characteristics can be obtained. These possibilities make the dc machine both versatile and adaptable for control.

974_Working of self - excited generators.png


Related Discussions:- Working of self - excited generators

Working design with realistic models, A preliminary design with ideal resis...

A preliminary design with ideal resistors, inductors and capacitors, will get 25 marks. If the design does not meet the specifications then one mark will be deducted following the

Briefly explain the principle and operation of strain gauges, Question: ...

Question: (a) With the help of a clearly labeled diagram explain the functioning of a basic thermocouple. (b) Briefly explain the principle and operation of strain gauges

Show the overall output limitations of speed control, Q. Show the Overall o...

Q. Show the Overall output limitations of Speed Control? The overall output limitations are as shown in Figure. With base speed defined as the full-field speed of themotor at t

Speed control of dc series motor - motor control , Speed Control of DC Seri...

Speed Control of DC Series Motor A half  wave  circuit  for the  speed  control of DC  series motor is  shown in figure and corresponding wave from  is shown  in figure  consis

Formulate the s-domain nodal equations, Consider the circuit shown in Figur...

Consider the circuit shown in Figure in the t -domain as well as in the s-domain. Formulate the s-domain nodal equations and use MATLAB to solve for V A (s) and V B (s).

.., Among copper and mercury which is better conductor of electricity?

Among copper and mercury which is better conductor of electricity?

Describe the functionalities and the purpose of an equalizer, Question: ...

Question: (a) For a CD quality sound, what is the bit depth used and give the amplitude's levels and the dynamic range of this sound quality (b) In audio technology, the dec

Define amplification factor and drain resistance, Q. Define amplification f...

Q. Define amplification factor, drain resistance and transconductance and derive the relationship between drain resistance and trans conductance? Drain resistance It is the

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