Generally I don't like any RUclips videos...but I like your video because your video is really very helpful regarding the significance of Back Emf in Dc Motor 🛵
your tone is sweet, clear & continuous, if you take a pause then it will be little bit better to understand, if some more graphics or video, it will be better to understand. overall nice elaboration on back emf. Your control & knowledge of subject is fabulous.
Thanks for teaching me back emf. I have my exam tomorrow and it's been hard to study ever since dad started drinking again. Thank God your voice drowns out my mum's screams for help. Wish me luck for tomorrow.🤞
It was amazing experience,I inspired just to watch your very first video,and waiting for the upcoming videos. Great way to teach by clearing all sort of concepts that are mentioned in the topic.
''Go back to the basic equation for the force on a current carrying conductor is: F is proportional to BLI F=force B=flux density (the strength of the field that the conductor is in) L=length of the conductor I=current in the conductor This is an EQUALITY. If we invert it, we get: I is proportional to F/BL So if the wire is being pulled through a magnetic field, the current on the wire must increase to balance the forces. If it does not increase, then in a motor, the slip will increase and the motor slows down because not enough current is being delivered to the motor to operate at rated speed. In DC and synchronous motors, this isn't a problem because both rotor and stator currents will increase. In an induction motor, the armature current is coupled to the surrounding stator magnetic field. As load increases, the motor slips slightly more until the flux density and current in the armature balance out electromechanically at a new operating point which is a slightly slower speed. If you overload an AC motor beyond the pull-out torque, the motor stalls. The field is rotating at a constant speed, equal to 7200 divided by the number of poles in the motor windings. So a standard 4 pole motor has it's field windings rotating magnetically at 1800 RPM. When the motor is loaded to 100% of it's torque (horsepower) rating, it will run at the name plate rated speed which is usually 1-3% below maximum speed (usually about 1720-1750 RPM). As you reduce the load to 0 (nothing on the shaft), it will gradually increase to some place close to 1800 RPM but never exceed it. For most applications, this speed is close enough that most folks treat it as constant. OK, getting back to the original situation... In AC motors, the locked current (and also rated torque) is roughly 150-200% of the rated (FLA or HP) range. Since this is twice the motor's rated cooling capacity, and with an integral fan, there's no air movement, you can't normally operate at this point for very long. Once the motor starts coming up to speed, the rated torque of the motor actually increases even more (the pull in torque), until it gets to rated speed where the force, flux, and current all balance again. So at least for a short time (until the motor overheats), it can pull much higher torques. Once you stop it, you are limited to the locked rotor torque (150-200%), and the heat load shoots up very quickly since the motor isn't moving. So in your theoretical "gear box is shot" situation, you might be able to get it to turn over for just a few seconds before shutting down due to overload, or in some situations, it won't even rotate the slightest bit. Starting currents (as the magnetic fields suck down all the current necessary to charge the fields) is often 17 times rated current, and in energy efficient models has been measured as high as 21 times or more. Don't forget too that this translates into torque internally in the motor...starting currents are the most destructive on rotor bars, insulation, and anything else involved in generating magnetic fields. Even after this is over with, current during stall (locked rotor) conditions surges to roughly 6 times normal full load current. With this in mind, it's obvious why with across-the-line starting, "bumping" is very hard on motors without drives to control the torque/current. Assuming that you deal with all the other problems of using drives (heat loads, potential standing waves, and rotor current buildup), it should be obvious why motors driven by drives often last much longer especially in frequent start/stop conditions than motors driven by across-the-line starters. If you use a full vector drive, you can manipulate the operating point of the motor. You can change the rotating field speed (frequency) and voltage to allow the pull in torque to occur even at ZERO speed. This gives full vector controlled AC induction motors a higher torque rating (roughly double) than their DC brethren where on a DC motor, torque is fixed from 0 speed all the way to rated (base) speed. Effectively, you can operate a motor with fixed torque, fixed speed, or vary both, just as you can with DC motors. Again, this is of course within the limits of the bearings and cooling capacity of the motor. Adding an external fan cooling system makes almost anything possible. Unlike a DC motor, AC motor math is ugly because you have the inductive transfer of energy from the fields to the armature. Everything gets very nonlinear and it makes my head hurt trying to follow some of what the motor gurus are talking about. Just remember that the rated speed on an AC motor is "approximate", and that once you throw a drive into the mix, you can achieve a lot more with an induction motor.''
I don't know why this back emf concept. Back emf is produced due to change in magnetic field due to rotation. Back emf is opposing the rotation not the supply (indirectly it is opposing).Correct me if I am wrong. I am fully confused☺
Niggas liketeded her voice and accent though, that was the best part. Listening through a DragonFly Black DAC and UE-900 I.E.M.s and she sound cool, right like. Reminds your boy of Sravya his designated magnetism tutor with the sweet candy breath...
I guess dc motor the cause is the supply voltage and to prevent this cause or oppose this cause the back emf develops and limits the incoming current ........but you have said the cause itself is the back emf.....
In case of AC supply same thing will happen, remember the supply voltage change on both stator and rotor so the resultant torque will act in same direction.
you are just reading out and not explaining why does that happen.. especially in the 3 conditions of motor, you just read it out and didnot explain why those changes occur in no load or sudden load
Beautifully explained the concept of back emf. Thank you very much for this beautiful video.
Generally I don't like any RUclips videos...but I like your video because your video is really very helpful regarding the significance of Back Emf in Dc Motor 🛵
Clear and audible voice... Keep going... Congrats
Mam your teaching method is sooo good but please use hindi some time plse
your tone is sweet, clear & continuous, if you take a pause then it will be little bit better to understand, if some more graphics or video, it will be better to understand. overall nice elaboration on back emf. Your control & knowledge of subject is fabulous.
U r best teacher.realy sbd ni h apke lia kya khu bs ap bhut acha pdhate h.thanks
very very good.from iran.
Nice explanation mam 👍🏻👍🏻
Good explanation 😂😂 I love the way of explaining 💖
Thanks for teaching me back emf. I have my exam tomorrow and it's been hard to study ever since dad started drinking again. Thank God your voice drowns out my mum's screams for help. Wish me luck for tomorrow.🤞
I hope it is not true
It was amazing experience,I inspired just to watch your very first video,and waiting for the upcoming videos.
Great way to teach by clearing all sort of concepts that are mentioned in the topic.
Very nice explain
The very best explanation, crystal clear 👍 looking forward to your next posting 🙏
Very good
Best Indian accent yet
Nice explanation
Superb way of teaching mam 👍👍👍👍
Very well explained ...thank you
Nice teach 👍👍👍
fabulous explanation mam!! tysm 4 uploading such informative videos!!❤
Mam?? I'm pretty sure he's a guy
nice video. very educating
Superb. Cleared my doubts
back e.m.f is always opposite to applied voltage so it opposes not regulates otherwise system will become self operating and perpetual
Awesome video mam fantastic
Tq mam.. Pls make video on speed control of dc motor
Very good explanation
Excellent meadam use full for learning students good
3 sentence in this video could gave me the answer I wanted..thankss
Explanation 👍🔥
Impressed
Very good containt everything is explained
Thank you
Very well explained mam.make more videos
Ur voice is so sweet
Owesom work
THANKS MAM
Thank you mam
Great explanation
Nice vedio
Thank you so much 🙏
Fleming right hand is used in dc generator and left hand for motor
here right hand rule is used to find the direction of induced back emf
Thora pharle bhai abhi vhi time hei..
Superbly said
''Go back to the basic equation for the force on a current carrying conductor is: F is proportional to BLI F=force B=flux density (the strength of the field that the conductor is in) L=length of the conductor I=current in the conductor This is an EQUALITY. If we invert it, we get: I is proportional to F/BL So if the wire is being pulled through a magnetic field, the current on the wire must increase to balance the forces. If it does not increase, then in a motor, the slip will increase and the motor slows down because not enough current is being delivered to the motor to operate at rated speed. In DC and synchronous motors, this isn't a problem because both rotor and stator currents will increase. In an induction motor, the armature current is coupled to the surrounding stator magnetic field. As load increases, the motor slips slightly more until the flux density and current in the armature balance out electromechanically at a new operating point which is a slightly slower speed. If you overload an AC motor beyond the pull-out torque, the motor stalls. The field is rotating at a constant speed, equal to 7200 divided by the number of poles in the motor windings. So a standard 4 pole motor has it's field windings rotating magnetically at 1800 RPM. When the motor is loaded to 100% of it's torque (horsepower) rating, it will run at the name plate rated speed which is usually 1-3% below maximum speed (usually about 1720-1750 RPM). As you reduce the load to 0 (nothing on the shaft), it will gradually increase to some place close to 1800 RPM but never exceed it. For most applications, this speed is close enough that most folks treat it as constant. OK, getting back to the original situation... In AC motors, the locked current (and also rated torque) is roughly 150-200% of the rated (FLA or HP) range. Since this is twice the motor's rated cooling capacity, and with an integral fan, there's no air movement, you can't normally operate at this point for very long. Once the motor starts coming up to speed, the rated torque of the motor actually increases even more (the pull in torque), until it gets to rated speed where the force, flux, and current all balance again. So at least for a short time (until the motor overheats), it can pull much higher torques. Once you stop it, you are limited to the locked rotor torque (150-200%), and the heat load shoots up very quickly since the motor isn't moving. So in your theoretical "gear box is shot" situation, you might be able to get it to turn over for just a few seconds before shutting down due to overload, or in some situations, it won't even rotate the slightest bit. Starting currents (as the magnetic fields suck down all the current necessary to charge the fields) is often 17 times rated current, and in energy efficient models has been measured as high as 21 times or more. Don't forget too that this translates into torque internally in the motor...starting currents are the most destructive on rotor bars, insulation, and anything else involved in generating magnetic fields. Even after this is over with, current during stall (locked rotor) conditions surges to roughly 6 times normal full load current. With this in mind, it's obvious why with across-the-line starting, "bumping" is very hard on motors without drives to control the torque/current. Assuming that you deal with all the other problems of using drives (heat loads, potential standing waves, and rotor current buildup), it should be obvious why motors driven by drives often last much longer especially in frequent start/stop conditions than motors driven by across-the-line starters. If you use a full vector drive, you can manipulate the operating point of the motor. You can change the rotating field speed (frequency) and voltage to allow the pull in torque to occur even at ZERO speed. This gives full vector controlled AC induction motors a higher torque rating (roughly double) than their DC brethren where on a DC motor, torque is fixed from 0 speed all the way to rated (base) speed. Effectively, you can operate a motor with fixed torque, fixed speed, or vary both, just as you can with DC motors. Again, this is of course within the limits of the bearings and cooling capacity of the motor. Adding an external fan cooling system makes almost anything possible. Unlike a DC motor, AC motor math is ugly because you have the inductive transfer of energy from the fields to the armature. Everything gets very nonlinear and it makes my head hurt trying to follow some of what the motor gurus are talking about. Just remember that the rated speed on an AC motor is "approximate", and that once you throw a drive into the mix, you can achieve a lot more with an induction motor.''
Excellent explanation 👍
Super
Today I have exam... tahnk you mam
thnks
Thnq madam
Thank you!
good explanation, iam new subscription 🤗
Fleming's left hand rule use in DC motor
But it accociated with Back Emf, not with motor operation. Back emf is motor generator acton during operation of motor.
very nice friend, keep going
Nice.... residential magnetism voltage...full video update plz
Thanku madom
Thank you very much !! mam
Voice clear h
For clarification; so Ia is the current supplied from Vt(Supply voltage)?
I don't know why this back emf concept. Back emf is produced due to change in magnetic field due to rotation. Back emf is opposing the rotation not the supply (indirectly it is opposing).Correct me if I am wrong. I am fully confused☺
Rotation is due to supply voltage so the back emf opposes the supply voltage
Dear India Lady....backEMF...is.A.Great energy source....if.we.have RESONANCE....
Armature current depends which quantity mam
I was here to study about back emf but your voice is too distracting.. #sweet😍
distracting yes, sweet no
yes. ..
Hi...madam i have one dout! About
3phase motors. Are you clarify to my quastion?
Motor runs according to Fleming's left hand rule.. :/
i really want to see you bcoz of your beautiful voice
nice
Rotor can rotate in anticlockwise direction . So its motor can not rotating in clockwise
Who's watching the shop?
what is load?
Nice g
Niggas liketeded her voice and accent though, that was the best part. Listening through a DragonFly Black DAC and UE-900 I.E.M.s and she sound cool, right like. Reminds your boy of Sravya his designated magnetism tutor with the sweet candy breath...
Flemming ka left hand rule hota hai
If the back emf high then need more current to maintain the speed of motor, back emf doesn't help to move motor forward..
I guess dc motor the cause is the supply voltage and to prevent this cause or oppose this cause the back emf develops and limits the incoming current ........but you have said the cause itself is the back emf.....
cheers babe
Starting music ka naam ?
when we give DC supply to the DC motor force are created or each armature conductor.
what about AC supply
In case of AC supply same thing will happen, remember the supply voltage change on both stator and rotor so the resultant torque will act in same direction.
👍
is this available in english??
This IS in english.
@@adhanda2017 you fooled me!
Archana please understantlll in Hindi languge
Eb is inversely proportional to Armature conductor????
Mistake😝😝😝 arm current
you are just reading out and not explaining why does that happen.. especially in the 3 conditions of motor, you just read it out and didnot explain why those changes occur in no load or sudden load
Cause is supply voltage and not back emf
Fleming's left hand rule 🤦♂
Fleming right hand rule in dc motor
Fleming left hand rule
Fleming left hand rule in dc motor
not right hand..it will be left hand
😭😭😭😭😭😭not the tutorial music 0:11
Well energy conversion is not very well explained..
It could have been better
Supeb
hiii
Hindi ma bolo 🙄 pllay ne padraa🥺
Sahi baat hai
Not clear concept.. lots things left.
But over all ok.
RIP Grammar
its left hand rule not right hand
You explain Hindi
i didn't understand is it only me?
U r beautiful ❤ u
Who else loves "langes" law 😂😂
Fak! Why every video i search about electricity has someone with a horrible accent talking??? So frustrating that i can't understand squad.
Wow seriously, don’t be an asshole. I can understand her fine and I’m English.
Fuck right off
That is because the U.S. educational system is so bad there aren't any competent english speaking persons to explain it !
Ur concepts are not good
And not inversely proportional
U r not. Clear
Copy paste ,!!!!!!!