Sir I have a big doubt 2:08 you draw the B-H curve but we study B-H curve in hysteresis loss in transformer, induction machine and there is alternating current present , but in DC machine how it is possible please explain
An alternating current is just an increase and decrease in current right, so in dc also you can increase decrease or change the direction etc using basic elements like rheostats and switches...
Great Video man! Just understood something my teacher didn't explain well. thank you. One question: you wrote If=Ea/Rf. Isn't it suppose to be If=Ea/(Rf+Ra)? What happend to Ra? and also what happend to Lf?
Yes you are correct, but since Ra is much much smaller than Rf the equation would be reasonably accurate...and since we are dealing with DC the author has not considered the effects of Inductance and associated reactance.
Sir what about when we start the generator for the 1st time. There won't be any residual flux because the generator is being used for 1st time right Sir ?
Sir.. you started this whole topic saying initially speed is 0, so no Ea generated.. but in this lecture you haven't talked about speed at all. So please explain about that a little.
Incredible Varun sir !!!
happy to find your channel❤
awesome....
@electrical is easy why make my life so easy like this
much respect anyway
Sir I have a big doubt 2:08 you draw the B-H curve but we study B-H curve in hysteresis loss in transformer, induction machine and there is alternating current present , but in DC machine how it is possible please explain
An alternating current is just an increase and decrease in current right, so in dc also you can increase decrease or change the direction etc using basic elements like rheostats and switches...
Sir, at 3:22, shouldn't it be If=Eares/(Rf+Ra)? why just Rf. We are assuming at start IL=0 so Ia=If?
Thanks for pointing it out, it was a small mistake, but the concept remains the same, you just have to add the Ra terms...thanks again...
IN INDUCTOR voltage leads then current starts flowing,so why u say volatage and current increases simultaneously?plz explain sir
10:21
good video keep it up
Great Video man! Just understood something my teacher didn't explain well. thank you.
One question: you wrote If=Ea/Rf. Isn't it suppose to be If=Ea/(Rf+Ra)?
What happend to Ra? and also what happend to Lf?
Yes you are correct, but since Ra is much much smaller than Rf the equation would be reasonably accurate...and since we are dealing with DC the author has not considered the effects of Inductance and associated reactance.
Sir, what happens when we reach saturation ? Means the flux isn't changing so ideally there must be no current, right?
Saturation means a point beyond which even after if you increase current there is no flux increase...
Good video 👍
What's k and omega here
Sir what about when we start the generator for the 1st time. There won't be any residual flux because the generator is being used for 1st time right Sir ?
Hi sir, where can I find the video of BH curve?
I don't think I have made a specific video regarding that..but it comes up in a lot of videos...
thanks man
Sir why voltage build up not happen in series dc generator
There will be no closed path for current to flow
Amazing sir
Thank you..do also consider sharing the videos...with your friends and anyone who might find them helpful
In Graph the Rf=Vt/Rf aaa?
Sir why residual voltage is only 1v or 2v not more than 100v....?
It’s because the flux inside the poles is very less...bcz the only flux in the poles during starting is residual flux...
Sir.. you started this whole topic saying initially speed is 0, so no Ea generated.. but in this lecture you haven't talked about speed at all. So please explain about that a little.
Thank you very much
Thanx
❣️🤩
good
Dc shunt generator(5kw) build up voltage high 598volt which reason sir
Sir voltage biluildup kb tk hoga.
Ans : jb tk core saturated na ho jaye.
Sir lakin core kb saturated hoga.
no load voltage variation will decrease with increase in field current
bhaiiiiii ji ek hindi me bnaooo yar
but if=vt/rf
Please give me the time stamp where u r having the doubt
Thanks for pointing it out , I forgot to add the Ra term to the equation, the concept however remains the same....