Very Much fruitful the session was. Got a very clear concept on the DC Machine structuring . I will appreciate such innovative and ingenious way of explanation for relevant Engineering topics from you guys in Future . Thank you
Nice question...remember that the commutators are rotating and brushes are stationary...so there will be a position when it will short circuit the commutators,..and that precisely is the problems occurring during commutation that are discussed....and commutators in machines if you see them do not have much width..so this is always unavoidable...
Sir at 1:27 in the third diagram , the position of brushes are interchanged . How is it sir? My next qn is that, at 6:26 you mentioned that the coils 2,4,6,8 are of 2V. COILS 3 AND 7 ARE 2V BCOZ SIN 90 IS 1 AND VxB is max. But in other coils sin 90 is not 1 , then how they are of 2v . Pls explain sir.
I too had doubt on this ???...some lecturer on UA-cam replied me that "flux is not parallel throughout the pole shoe...it is somewhat radial and hence flux is perpendicular to velocity vector at any position"..... But still I had a doubt that if he said was true then how can be the emf induced inside armature conductors is sinusoidal?
Actually that voltage is not very important and the short circuiting of the coil will close the loop at the brush you start with....it doesn’t add up with the other coils...
At 6:00 how u can say emf induced per conductor is e. It's on the whole emf induced per turn is e I.e emf induced per coil is e . e get increased when coil gets increased. Can u clarify
Why the axis of brushes in 2D diagram is on the vertical axis whereas while we draw it's 3D perspective it's drawn horizontally. Lil bit confusion. Kindly clear
U said to keep the brush in the position of 0v in the above explanation So What is the point of drawing develop diagram and finding the position of brushes
Hi Varun, How can we take the voltages in each turn as same?? that is as 'e'. If we are taking top and bottom coil induced voltages as zero each turns are linking with field in different rate right?
there are many explanation for this..the one I find easier is the direction velocity and field is parallel at both top and bottom conductors...and so v X B is 0, there is other explanation which tell if you divide the top conductor is two halves, both these will induce emf in opposing nature which cancels the overall EMF..
@@pradeepprakash7105 two half conductors....one at left side and other at right side Left side conductor motion is upwards(if machine is rotating clockwise) and right side conductor motion downwards Both will thus have opposing equal emf...
I may not have got time to cover all type of numericals bcz I have to cover a lot of other topics also. I suggest you practise with previous gate, Ies questions also
In case of DC motors if you do not reverse the current there will be torque reversal and the motors would not rotate a complete rotation...it’s explained in my video on working of DC motor
+naga raju the commutation occurs properly when the conductors under brushes have zero emf..but due to armature reaction the magnetic neutral plane shifts which causes sparking at brushes..that is why it's a problem..thank you
best teacher of electrical engineering
Sir your method of teaching is great.. I am getting all my concepts cleared.. Thank you a lot..
finally i got a best video . thumbs up sir (Y)
+Hasnain Ali Shah thank you very much..the support means a lot to me...
Awesome explanation sir.....
Ur video explanation is far better than to direct approach for gate question
Very Much fruitful the session was. Got a very clear concept on the DC Machine structuring . I will appreciate such innovative and ingenious way of explanation for relevant Engineering topics from you guys in Future .
Thank you
Thanks... however there are no guys.. it’s just me alone..😀😀😀
At 06:54
Why are you connecting a brushe between two commutators? Isn't brush connected to a single commutator at one time?
Nice question...remember that the commutators are rotating and brushes are stationary...so there will be a position when it will short circuit the commutators,..and that precisely is the problems occurring during commutation that are discussed....and commutators in machines if you see them do not have much width..so this is always unavoidable...
Sir you are a saint
+AJ HUNTER ha ha oh no..I just want all of you to have free and quality content on electrical engineering .....
Very good explanation. Very informative.
thank you so much..please also do consider sharing the videos with your friends or anyone who might find them helpful...
Sir at 1:27 in the third diagram , the position of brushes are interchanged . How is it sir?
My next qn is that, at 6:26 you mentioned that the coils 2,4,6,8 are of 2V. COILS 3 AND 7 ARE 2V BCOZ SIN 90 IS 1 AND VxB is max. But in other coils sin 90 is not 1 , then how they are of 2v . Pls explain sir.
I too had doubt on this ???...some lecturer on UA-cam replied me that "flux is not parallel throughout the pole shoe...it is somewhat radial and hence flux is perpendicular to velocity vector at any position"..... But still I had a doubt that if he said was true then how can be the emf induced inside armature conductors is sinusoidal?
thank u sir..
plz upload videos of wave winding.....
At 07:35 isn't the voltage across brushes = 2 + 2 +2 + 0 + 2 =8 volts (including coils where brushes are connected)???
Actually that voltage is not very important and the short circuiting of the coil will close the loop at the brush you start with....it doesn’t add up with the other coils...
At 6:00 how u can say emf induced per conductor is e. It's on the whole emf induced per turn is e I.e emf induced per coil is e . e get increased when coil gets increased. Can u clarify
Why the axis of brushes in 2D diagram is on the vertical axis whereas while we draw it's 3D perspective it's drawn horizontally. Lil bit confusion. Kindly clear
U said to keep the brush in the position of 0v in the above explanation
So What is the point of drawing develop diagram and finding the position of brushes
How will the conductors 1 and 2 have same emf even if they were displaced by some slot pitch or is it assumed such??
Hi Varun, How can we take the voltages in each turn as same?? that is as 'e'. If we are taking top and bottom coil induced voltages as zero each turns are linking with field in different rate right?
Can you please add the time of video where you are getting the doubt, so that I don't have to go through the entire video
Sry to disturb..it was actually cleared by latter part of video..in between I commented..thanks for the reply Varun..and ur effort really helping me🤗
It's all ok and cool, no need for sorry...
Sir,can i talk to you at call?
Sir...any references for power systems
Sir ,,why reversing of current is existing I can't understand
why it is zero emf induced in top and bottom conductors and how????
there are many explanation for this..the one I find easier is the direction velocity and field is parallel at both top and bottom conductors...and so v X B is 0, there is other explanation which tell if you divide the top conductor is two halves, both these will induce emf in opposing nature which cancels the overall EMF..
@@ElectricalisEasy sir i can't understand your second explanation in the above comment. Can you clarify that??
@@pradeepprakash7105 difficult to explain like this...
@@ElectricalisEasy if you can do means , can you please brief me about it sir?
@@pradeepprakash7105 two half conductors....one at left side and other at right side
Left side conductor motion is upwards(if machine is rotating clockwise) and right side conductor motion downwards
Both will thus have opposing equal emf...
Sir i am preparing for gate electrical via self study
So sir does this course contain complex problem solving too as asked in gate
I may not have got time to cover all type of numericals bcz I have to cover a lot of other topics also. I suggest you practise with previous gate, Ies questions also
Sir i have a small doubt,why emf is zero when conductor is perpendicular to magnetic field
It is all about the position of the conductor...when the velocity of the conductor is parallel to field direcrion EMF is 0...
Why have to reverse the current direction?????
In case of DC motors if you do not reverse the current there will be torque reversal and the motors would not rotate a complete rotation...it’s explained in my video on working of DC motor
Thank you!
Excuse me sir , how can u say that armature reaction is the problem for commutation in a DC machine..plz explain
+naga raju the commutation occurs properly when the conductors under brushes have zero emf..but due to armature reaction the magnetic neutral plane shifts which causes sparking at brushes..that is why it's a problem..thank you
varun nair thank u sir...
Sir sir plz make videos on scr full chapter.
Actually now I am concentrating on ac machines
Thanks sir
life can be easier for sure ...
ab jake samhaj aya hai ki hamara chutiya professor class mai kal kya padha rha tha. Nice explanation.
Add wave winding video
will upload soon, I just wanted to finish the armature reaction concepts.