@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B) L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation. Please correct me if I am wrong.
Had to watch this a few times for it to sink in. The key is the current lag increase due to frequency. The further the rotor current lags behind the max flux in the RMF the less the torque. YES !! Thank you for this.
My word thank you so much. My book doesn't really have a great explanation and I could not visualize this. I don't usually leave any comments but you have no idea how much this helped me for the exam I have tomorrow :D
These kind of yt channels are needed for all those students whose teachers teaches physics in a very boring way(literally killing the interest of students in science) , learn engineering is there to save the soul of Physics Thanku for helping a lot of students Literally I'm crying 🥺🥺
Wow, interesting! i always thought the resistance was for keeping the motor from drawing too much current during startup, but apparently you can also tune your RL circuit with it, NICE! thanks Learn Engineering
It IS used mainly to prevent high inrush starting current, but I also didn't know about the RL phase angle tuning before this video. I haven't known why induction motors have only around half maximum torque at startup (which is still not that bad)
@@Bizzon666 Only Squirrel Cage Induction Motors have a Starting Torque of about 0,5x Nominal Torque to be more precise. If I am not mistaken: Slip Ring Induction Motors have about 1,5x Nominal Torque as Starting Torque.
@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B) L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation. Please correct me if I am wrong.
@@killer2600 To get the magnetic field du to a current flowing through a conductor we use right hand. But yes here in the video if we use left hand everything falls in place. I got a solution to it and have prepared a report on it. In the report I have tried my best to explain why this video could have been represented in another way so that the confusion of why using right hand rule doesn't work here and anyways how magically the use of left hand works (though weird). Please go through the link and correct me if am wrong. drive.google.com/file/d/1tMBLwAtVLtfxmIj-DqlxEhWVGdzAcU2g/view?usp=drivesdk
@@abhisekrout8522 This is youtube not college lecture class for future electric motor designers so I really could care less about the accuracy of a few arrows. So long as the rotor spins in the same direction as the rotating magnetic field it's good enough for youtube IMO.
@@killer2600 Yeah, you are right but what I feel is animating the stator magnetic field instead of rotor magnetic field to explain the operating principle of an induction motor would be a lot more intuitive. And If I am right then there are some serious errors regarding the current magnitude at different rotor conductors relative to their position wrt the stator magnetic field.
I just invited my 100 students to watch this video as a complement to the analytical/mathematical analysis of the induction motor that they've just seen on the chalkboard. Thumbs up, guys! Excellent work!
@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B) L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation. Please correct me if I am wrong.
I'm in the process of rebuilding a 3 phase slip ring motor at work. Should be re assembling it tomorrow (Monday). It's cool to see videos like this. keep em' coming.
Very good video explaining this, We still have a lot of cranes using wound rotor motors but there days are getting fewer and fewer as we are now just using VFD's and less expensive squirrel cage motors.
Awesome job! We have been doing up grades at our facility on our Mills from DC motors to AC motors with vector drives .We are saving a boatload of 💰 in energy costs. It's all about the drives.Thanks again.
basically what the video implied was that increasing the rotor reistance would increase the current, because of reducing the phase shift. however i think the phase shift occurs because the current is lower when there is a resistor. i always thought the point of this construction is to lower the starting current and save the rotor from overheating. it could also be helpfull to reduce the phase shift on the primary, because industrial electrical bills tax you heavy for non-resistive-behaving loads (power factor) and is also a good way to maintain high torque over a wider range of rpms, because you can deadshort the rings when the motor get up to rpm and get the same starting torque you had with resistors, but now without them and at much higher speed. if i was to build such a device i would make the reistors part of the rotor and engage/disengage contacts by moving small bearings sliding freely on the shaft but connected to the contacts (something like the concept of a throwout bearing of a clutch)
This video describes an old application of Slip ring motors, there are four different squirrel cage induction motors nema deisgns to overcome the torque speed characteristic problems. The slip ring induction motors are a lot more interesting as genererators in wind applications (Doubly Fed Induction Generators). Nowadays, the high startup torque and reduce inrush current are adjusted using variable frequency drives.
Time to compliment! Love your simple visualize easy to follow animation style explanation!! These must take a loooooooooooooooooooooooooooooong time to make! But they make me understand so faaaaaaaaaaaaaaaaaaaaaaaaaaaaaast!!!
Hello team! Thank you for the video! It was very helpful! I have a suggestion for you. An animation on Vibration Motors and Analog and Digital Watches would be very good. Thank you!
Can you do some videos about roller coaster mechanics? Things like LIM/LSM, Hydraulic and Pneumatic launch, how catch cars and brakes work, how restraints work, etc
However nowadays we can have good torque-speed profile with Squirrel Cage Induction Motor as well. Thanks to VVVFDs(Variable Voltage Variable Frequency Drives). High starting Torque, Low Starting Current with low starting frequency. Also helps in starting up a synchronous motor. This has made slip-ring motor application very rare. Also initial cost and maintainence of slip ring IM is costly too.
torque and current are proportional untill you saturate the iron core of either the rotoro or stator, so VVVFDs can't increase the starting torque, they can only save money on the electric bill and save the motor from overheating
@@two_number_nines No they can increase the starting Torque by reducing supplied frequency but at the same time reducing the supply voltage as well (to avoid saturation and maintain air gap flux constant). Thus with reduced voltage we have reduced speed but at the same time we have reduced supply frequency which provides great starting torque with low starting Current. In other words, we have great torque at reduced speed and that's what is required for most of the motor application like traction. However nowadays we can have Torque-speed independent as well with the help of vector speed control instead of VFD.
TORQUE IS PROPORTIONAL TO THE FORCE APPLIED ON THE ROTOR. THAT FORCE IS PROPORTIONAL TO THE MAGNETIC FLUX FLOWING TROUGH THE ROTOR. THE MAGNETIC FLUX TROUGH THE ROTOR IS PROPORTIONAL TO THE CURRENT FLOWING TROUGH THE ROTOR ALUMINUM. THE CURRENT FLOWING TROUGH THE ROTOR ALUMINUM IS PROPORTIONAL TO THE MAGNETIC FLUX AMPLITUDE SUPPLIED BY THE STATOR. THE MAGNETIC FLUX AMPLITUDE DEPENDS ON THE FREQUENCY AND SUPPLY VOLTAGE. IF A MOTOR IS DESIGNED FOR 50 HZ 220V GRID THEN IT PROBABLY WILL SATURATE THE IRON CORE OF THE ROTOR EVEN AT 190V 50HZ IF THE ROTOR IS LOCKED INTO POSITION. VARIABLE FREQUENCY DRIVE WILL JUST LIMIT THE CURRENT DURING STARTUP WHILE MAINTAINING THE MAXIMUM TORQUE THE IRON CORE CAN MAKE BEFORE SATURATING.
Shouting it won't really help your case. VFDs with motor feedback control are routinely used in industry, and particularly in vehicles, like every vehicle Tesla makes, to increase starting torque by reducing the phase difference without wasting power with slip rings and external resistance. The principle for increasing starting torque is the same as a slip ring motor, but the means used to achieve it are different, and much more efficient.
i will repeat again shortly. the torque of the motor is bottlenecked by the cross section surface area of the rotor iron core. there is no physical way to increase the flux of the magnetic field lines trough the rotor substantially in commercially practical ways
By increasing the starting resistance you can simulatneously increase starting torque and decrease stator inrush current. Saves a lot of cable. Past a certain point the increased resistance allows you to reduce torque again thereby giving a softer start and speed control if desired. Most manufacturers use the same housing for squirrel change and wound rotor machines. Cranes, grinding mills, metals crushers can all benefit from something that can deliver nearly 5 times continuous rated torque. Unlike VSD there are no harmonics and no transistor or switching losses.
Please correct the advantage part in the video. As those are the advantages and disadvantages of slip ring induction motor, so 1st advantage should be high starting torque . Thank you very much for making this video. It is too much helpful and easy to understand.
well, induction is akin to magic. scientists did not believe it at first either. Faraday had difficult time convincing others, because he did not receive conventional education himself.
Hi folks! What about a video to explain how double fed induction generators work? They are key elements in wind power turbines along a double electronic converter topology. The way those generators work is difficult to visualize without your outstanding videos!
In the early 1970s I worked in a movie sound lab in Vancouver, Canada. Our many playback machines, the projector, and the recorder, all transporting 35 mm picture film & 35 mm magnetic {audio} film, were synchronized {locked together} using 3-phase wound-rotor induction motors. Shortly after that time, cheaper & more flexible vari-speed-capable stepper motor technology came into use, and all those beautiful expensive wound-rotor motors went to the scrapyard. Today, of course, the movie business works with giant digital files. Analog images & audio recordings are ancient history, with a few very rare exceptions. But it was interesting to have worked with that 1930s interlock technology - it had its charms...
These graphics are impressive looking and great for getting a high level picture of the operation they may be topo busy to gain thorough fundamental understanding of the operation form my perspective. I kind of suck at this stuff but I'm also not unfamiliar with the concepts.
@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B) L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation. Please correct me if I am wrong.
Hey @@levimays55 , I was confused the same way. The magnetic field shown isn't stator field instead it is rotor field. Now on using right hand rule and all we get the same direction of rotation and the rotor current as shown in the animation. But If was asked to animate then I would have animated the stator field intead of rotor field as that would be a lot more intuitive and easy to understand. Check out the note I prepared here, that may be helpful. drive.google.com/file/d/18H-DJ_Gq8dHPaIIZgnxAYcIXxqug0_Lk/view?usp=sharing
Thank you for the great visualization. What an amazing tool TH-cam is, 20 years ago one had to study this from a book and could not figure out anything
From my pt. of view not knowing too much but a little effort of mine "As in 3-phase induction motor ,we have to give 3-phase Ac supply to rotor windings as it will become heavy , inertia losses and low speed of rotor makes it inefficient (poor efficiency ) so generally not used
These guys are REALLY good. 1.756 million (monetized) views for a mixed bag of arbitrary technobabble and nifty animation. Lucky for them, YT will never be the wiser.
Seems an advance design issue of induction motors, which makes this video very precious. Looking forward to much more videos the same as this "level" on that kind of electrical subjects... Regards (One more thing : In this video, you are indicating phase angle/torque relationship, giving direct notions on them. Have you given a theoretical background of the reason why/how phase angle is related to torque first and foremost ?)
In many of the mentioned tasks in this video, like lifts and loaded starts the Variable Frequency Drive with squirrelcage or permanent magnet motor took over for being simpler and more efficiënt. Also slipring motors can be controlled by electronics making them more powerfull and efficiënt. They convert the otherwise wasted rotor energy back to electricity instead of heat.
So, correct me if I'm wrong: It is much more interesting, technically, to make use of variable speed drives in combination with regular Squirrel Cage motors, instead of Slip Ring motors right?
@@Chimichanga5666 The biggest advantage of Squirrel cage motors is that the barings are the only moving parts. Less to maintain and no commutator arcs or sliprings that can also arc when dirty. Motors with permanent magnets have more starting torque, those with wound rotors can also produce more starting torque and the regenerative braking, even when the energy gets dumped in resistors (very common) saves wear on mechanical brakes. Motor drives can be used on wound rotor motors and tesla cars drive permanent magnet motors. It all depends on the application and load.
Nicely explain .... but external resistance is used not only to decrease the phase difference but also to limit current because at locked rotor condition current is 5 to 6 times of full load current
@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B) L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation. Please correct me if I am wrong.
These videos are gold on youtube
Such an awesome video. Thanks for sharing
yes indeed
Exactly
@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B)
L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation.
Please correct me if I am wrong.
correct
Had to watch this a few times for it to sink in. The key is the current lag increase due to frequency. The further the rotor current lags behind the max flux in the RMF the less the torque. YES !! Thank you for this.
My word thank you so much. My book doesn't really have a great explanation and I could not visualize this. I don't usually leave any comments but you have no idea how much this helped me for the exam I have tomorrow :D
can't stress enough how much I enjoy these vids, thanks for all your hard work guys!
These kind of yt channels are needed for all those students whose teachers teaches physics in a very boring way(literally killing the interest of students in science) , learn engineering is there to save the soul of Physics
Thanku for helping a lot of students
Literally I'm crying 🥺🥺
I may not understand thoroughly the first and second time, but I will be back !! Thank you!
When explaining about phase increasing or decreasing, perhaps showing a phasor diagram of the current and voltage of the rotor might help.
If you want to know more about slip rings, you can follow my homepage, which contains the conciseness of different slip rings, welcome to watch.
People who really have the teaching skill is on youtube.For a fact they dont exist in universities.
One of your best illustrations yet. Thank you very much!
This answer all my questions. It is an incredible video that take a lot of time to make. You are the best. Thank you!
Wow, interesting! i always thought the resistance was for keeping the motor from drawing too much current during startup, but apparently you can also tune your RL circuit with it, NICE! thanks Learn Engineering
It IS used mainly to prevent high inrush starting current, but I also didn't know about the RL phase angle tuning before this video. I haven't known why induction motors have only around half maximum torque at startup (which is still not that bad)
lesics now
@@Bizzon666 Only Squirrel Cage Induction Motors have a Starting Torque of about 0,5x Nominal Torque to be more precise. If I am not mistaken: Slip Ring Induction Motors have about 1,5x Nominal Torque as Starting Torque.
Induction theory is very difficult to explain to a layman. I believe this type of explanation is the best I have seen. Good job.
@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B)
L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation.
Please correct me if I am wrong.
@@abhisekrout8522 Why are you using your right hand? You should be using your left hand.
@@killer2600 To get the magnetic field du to a current flowing through a conductor we use right hand. But yes here in the video if we use left hand everything falls in place. I got a solution to it and have prepared a report on it. In the report I have tried my best to explain why this video could have been represented in another way so that the confusion of why using right hand rule doesn't work here and anyways how magically the use of left hand works (though weird). Please go through the link and correct me if am wrong.
drive.google.com/file/d/1tMBLwAtVLtfxmIj-DqlxEhWVGdzAcU2g/view?usp=drivesdk
@@abhisekrout8522 This is youtube not college lecture class for future electric motor designers so I really could care less about the accuracy of a few arrows. So long as the rotor spins in the same direction as the rotating magnetic field it's good enough for youtube IMO.
@@killer2600 Yeah, you are right but what I feel is animating the stator magnetic field instead of rotor magnetic field to explain the operating principle of an induction motor would be a lot more intuitive. And If I am right then there are some serious errors regarding the current magnitude at different rotor conductors relative to their position wrt the stator magnetic field.
Very very nice, i am principal of a pvt. iti and i found this video very usefull, thanks
I just invited my 100 students to watch this video as a complement to the analytical/mathematical analysis of the induction motor that they've just seen on the chalkboard. Thumbs up, guys! Excellent work!
@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B)
L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation.
Please correct me if I am wrong.
I'm in the process of rebuilding a 3 phase slip ring motor at work. Should be re assembling it tomorrow (Monday). It's cool to see videos like this. keep em' coming.
Very good video explaining this, We still have a lot of cranes using wound rotor motors but there days are getting fewer and fewer as we are now just using VFD's and less expensive squirrel cage motors.
Awesome job! We have been doing up grades at our facility on our Mills from DC motors to AC motors with vector drives .We are saving a boatload of 💰 in energy costs. It's all about the drives.Thanks again.
I better get back to work.Converting float sensor in water tower from laser to ultrasonic.Hope we have better luck .Winter is coming.
Aapki Team Bahut Achha Kaam kar rahi hai. Hum sikh pate hai. Thanks
basically what the video implied was that increasing the rotor reistance would increase the current, because of reducing the phase shift. however i think the phase shift occurs because the current is lower when there is a resistor. i always thought the point of this construction is to lower the starting current and save the rotor from overheating. it could also be helpfull to reduce the phase shift on the primary, because industrial electrical bills tax you heavy for non-resistive-behaving loads (power factor) and is also a good way to maintain high torque over a wider range of rpms, because you can deadshort the rings when the motor get up to rpm and get the same starting torque you had with resistors, but now without them and at much higher speed. if i was to build such a device i would make the reistors part of the rotor and engage/disengage contacts by moving small bearings sliding freely on the shaft but connected to the contacts (something like the concept of a throwout bearing of a clutch)
Really awesome video of working of Induction motor with lucid explanation
Thank you so much for simple and good explanation.
Lots of love and respect from india
you guys are awesome.......such things only makes youtube worthy....🙏🏻
Really good...the best ever in the youtube
So this is how a Synchronous motor works.. Wow, thank you
People like these make society progress . I wish everyone had the same mental approach.
Very good explanation and correct theory So far nobody explained ln such detailes
Great innovative videos,,RESPECT from worlds STRONGER NUCLEAR power PAKISTAN.
A perfect explanation for those who already understand induction motors.
best animation and explanation. Thumbs up for ur effort ..
A lot of work goes into these videos...thanks a bunch folks!
Super explanation in slip ring rotor 👌👌
This video describes an old application of Slip ring motors, there are four different squirrel cage induction motors nema deisgns to overcome the torque speed characteristic problems. The slip ring induction motors are a lot more interesting as genererators in wind applications (Doubly Fed Induction Generators). Nowadays, the high startup torque and reduce inrush current are adjusted using variable frequency drives.
I had to watch it twice to understand everything 😅. But the explanation was phenomenal
I watched 10 times but i cannot understand
Imma get to work designing a self-contained version.
@@adhil8918 Should have electrical background... focus on your interest
I didn't understand any of this, thus that's why I'm not an electronic engineer ! But a fascinating insight into how motors work..
Time to compliment! Love your simple visualize easy to follow animation style explanation!! These must take a loooooooooooooooooooooooooooooong time to make! But they make me understand so faaaaaaaaaaaaaaaaaaaaaaaaaaaaaast!!!
Hello team! Thank you for the video! It was very helpful!
I have a suggestion for you. An animation on Vibration Motors and Analog and Digital Watches would be very good. Thank you!
Can you do some videos about roller coaster mechanics? Things like LIM/LSM, Hydraulic and Pneumatic launch, how catch cars and brakes work, how restraints work, etc
YOU GUYS ARE REALLY GOOD IN THAT, PLEASE CONTINUALLY DOING THIS VIDEOS, BECAUSE YOU ALL ARE AMAZING VERY GOOOOOOOOOOOD PERFECT
पावर फेक्टर बिडियो power fector all working knowledge 👉th-cam.com/video/zkm-6Zk4yUA/w-d-xo.html
However nowadays we can have good torque-speed profile with Squirrel Cage Induction Motor as well. Thanks to VVVFDs(Variable Voltage Variable Frequency Drives). High starting Torque, Low Starting Current with low starting frequency. Also helps in starting up a synchronous motor. This has made slip-ring motor application very rare. Also initial cost and maintainence of slip ring IM is costly too.
torque and current are proportional untill you saturate the iron core of either the rotoro or stator, so VVVFDs can't increase the starting torque, they can only save money on the electric bill and save the motor from overheating
@@two_number_nines No they can increase the starting Torque by reducing supplied frequency but at the same time reducing the supply voltage as well (to avoid saturation and maintain air gap flux constant). Thus with reduced voltage we have reduced speed but at the same time we have reduced supply frequency which provides great starting torque with low starting Current.
In other words, we have great torque at reduced speed and that's what is required for most of the motor application like traction.
However nowadays we can have Torque-speed independent as well with the help of vector speed control instead of VFD.
TORQUE IS PROPORTIONAL TO THE FORCE APPLIED ON THE ROTOR. THAT FORCE IS PROPORTIONAL TO THE MAGNETIC FLUX FLOWING TROUGH THE ROTOR. THE MAGNETIC FLUX TROUGH THE ROTOR IS PROPORTIONAL TO THE CURRENT FLOWING TROUGH THE ROTOR ALUMINUM. THE CURRENT FLOWING TROUGH THE ROTOR ALUMINUM IS PROPORTIONAL TO THE MAGNETIC FLUX AMPLITUDE SUPPLIED BY THE STATOR. THE MAGNETIC FLUX AMPLITUDE DEPENDS ON THE FREQUENCY AND SUPPLY VOLTAGE. IF A MOTOR IS DESIGNED FOR 50 HZ 220V GRID THEN IT PROBABLY WILL SATURATE THE IRON CORE OF THE ROTOR EVEN AT 190V 50HZ IF THE ROTOR IS LOCKED INTO POSITION. VARIABLE FREQUENCY DRIVE WILL JUST LIMIT THE CURRENT DURING STARTUP WHILE MAINTAINING THE MAXIMUM TORQUE THE IRON CORE CAN MAKE BEFORE SATURATING.
Shouting it won't really help your case. VFDs with motor feedback control are routinely used in industry, and particularly in vehicles, like every vehicle Tesla makes, to increase starting torque by reducing the phase difference without wasting power with slip rings and external resistance. The principle for increasing starting torque is the same as a slip ring motor, but the means used to achieve it are different, and much more efficient.
i will repeat again shortly. the torque of the motor is bottlenecked by the cross section surface area of the rotor iron core. there is no physical way to increase the flux of the magnetic field lines trough the rotor substantially in commercially practical ways
By increasing the starting resistance you can simulatneously increase starting torque and decrease stator inrush current. Saves a lot of cable. Past a certain point the increased resistance allows you to reduce torque again thereby giving a softer start and speed control if desired. Most manufacturers use the same housing for squirrel change and wound rotor machines. Cranes, grinding mills, metals crushers can all benefit from something that can deliver nearly 5 times continuous rated torque. Unlike VSD there are no harmonics and no transistor or switching losses.
d
Please correct the advantage part in the video.
As those are the advantages and disadvantages of slip ring induction motor, so 1st advantage should be high starting torque .
Thank you very much for making this video. It is too much helpful and easy to understand.
Great videos, love than animation and content, very helpful. 🙏👍👌 Thank you!
this is a great video but it would be better if it went a little slower, clearly explaining each image before going on to the next.
This is tantamount to magic for most common folk... myself included.
well, induction is akin to magic.
scientists did not believe it at first either.
Faraday had difficult time convincing others, because he did not receive conventional education himself.
This is absolutely a great vid!
thans a lot. very good explanation sir. keep it up. im from SRI LANKA.
TPG.MANOHARAN KAMALESAN Tamil person??
very elucidative presentation. presentation with excellent explanation
Hi folks! What about a video to explain how double fed induction generators work? They are key elements in wind power turbines along a double electronic converter topology. The way those generators work is difficult to visualize without your outstanding videos!
Thanks Learn Engineering, your videos are very informative with great visuals. Thanks again.
dear bro, thanks for this video. Please create another video showing us how you did these beautiful designs and animation
In the early 1970s I worked in a movie sound lab in Vancouver, Canada. Our many playback machines, the projector, and the recorder, all transporting 35 mm picture film & 35 mm magnetic {audio} film, were synchronized {locked together} using 3-phase wound-rotor induction motors. Shortly after that time, cheaper & more flexible vari-speed-capable stepper motor technology came into use, and all those beautiful expensive wound-rotor motors went to the scrapyard. Today, of course, the movie business works with giant digital files. Analog images & audio recordings are ancient history, with a few very rare exceptions. But it was interesting to have worked with that 1930s interlock technology - it had its charms...
no... we thank you.... you guys are he real MVPs
Beautifully explained and amazing visuals. Thanks!
a very helpful content for understanding the differences between squirrel cage and slip ring induction motors. thank for such invaluable video.
As advantage too is the important torque at the startup.
A friend from Tunisia.
Very nice explanation ...Every points are clearly understandable. Thank you so much.
These graphics are impressive looking and great for getting a high level picture of the operation they may be topo busy to gain thorough fundamental understanding of the operation form my perspective. I kind of suck at this stuff but I'm also not unfamiliar with the concepts.
Such a beautiful animation and explanation thanks a lott sir
@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B)
L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation.
Please correct me if I am wrong.
The direction of F is wrong because the direction of current is wrong. The induced current will oppose the change in field (from the stator)
Hey @@levimays55 , I was confused the same way. The magnetic field shown isn't stator field instead it is rotor field. Now on using right hand rule and all we get the same direction of rotation and the rotor current as shown in the animation. But If was asked to animate then I would have animated the stator field intead of rotor field as that would be a lot more intuitive and easy to understand.
Check out the note I prepared here, that may be helpful.
drive.google.com/file/d/18H-DJ_Gq8dHPaIIZgnxAYcIXxqug0_Lk/view?usp=sharing
I am a Korean studying electrical engineering. Thank you.
Great explanation 👍🏼👍🏼
This is a 1st for SRI motor on u tube
You'r videos are gold.
Excellent job 👍
Virus : how induction motor starts ?
Raju : brrr brrrrrrrrrrrrrrrrr
😂😂😂😂😂😂😂😂
Thank you for the great visualization. What an amazing tool TH-cam is, 20 years ago one had to study this from a book and could not figure out anything
Couldn't be simpler explanation than this. Hats off.
Kindly make a video on induction generator.
Yeah, I am also waiting for an induction generator video to pop up.
From my pt. of view not knowing too much but a little effort of mine
"As in 3-phase induction motor ,we have to give 3-phase Ac supply to rotor windings as it will become heavy , inertia losses and low speed of rotor makes it inefficient (poor efficiency ) so generally not used
Thank you very much.
The explanation is very good.
These guys are REALLY good. 1.756 million (monetized) views for a mixed bag of arbitrary technobabble and nifty animation. Lucky for them, YT will never be the wiser.
What should I've done if u hadn't uploaded these kind of videos on TH-cam 😃
Thanks a lot and lot guys
Seems an advance design issue of induction motors, which makes this video very precious.
Looking forward to much more videos the same as this "level" on that kind of electrical subjects...
Regards
(One more thing : In this video, you are indicating phase angle/torque relationship, giving direct notions on them.
Have you given a theoretical background of the reason why/how phase angle is related to torque first and foremost ?)
In many of the mentioned tasks in this video, like lifts and loaded starts the Variable Frequency Drive with squirrelcage or permanent magnet motor took over for being simpler and more efficiënt. Also slipring motors can be controlled by electronics making them more powerfull and efficiënt. They convert the otherwise wasted rotor energy back to electricity instead of heat.
So, correct me if I'm wrong: It is much more interesting, technically, to make use of variable speed drives in combination with regular Squirrel Cage motors, instead of Slip Ring motors right?
@@Chimichanga5666 The biggest advantage of Squirrel cage motors is that the barings are the only moving parts. Less to maintain and no commutator arcs or sliprings that can also arc when dirty.
Motors with permanent magnets have more starting torque, those with wound rotors can also produce more starting torque and the regenerative braking, even when the energy gets dumped in resistors (very common) saves wear on mechanical brakes.
Motor drives can be used on wound rotor motors and tesla cars drive permanent magnet motors.
It all depends on the application and load.
@@picobyte Ok, so slip ring motors can still be interesting for certain applications right? In any case, thanks for your answer!
go on ........very good service indeed!!!!!!
Really awesome video and easily understand
excellent explanation,best in the current you tube videos about slip ring induction motor
Nicely explain .... but external resistance is used not only to decrease the phase difference but also to limit current because at locked rotor condition current is 5 to 6 times of full load current
Your videos are really very helpful 🙏🏻 Thank you so much ☺️
Makes me think of my computer science lessons on analog and digital electronics......really an intrestin' staff
Really good videos.....
Keep it up buddies......
We all support you
you deserve great respect man hatsoff
Please do a video on different types of generators.
I love your videos. So much work goes into each one.
You know you are very good at creating animations keep rock at some other videos also
Thank you for giving deep information about slip ring induction motor
Great youtube channel for to know about engineering...thanku sir
Used to love the old RI motors. Few electricians would know how to tune them now days. Single phase 480volt commonly used on farms
we love Slip ring Induction Motors ;-)
I'd like this youtuber to explain Schrage motor.
great video. thanks
Incredible graphics and clarity. Thank you!
Nice channel.
And useful videos
Video on Circuit breakers please
It has helped so much in my exams...
Beautifully explained. Thankyou LearnEngg.😊
I thought you placed that box in your comment so that someone can lay an egg!
@@davemwangi05 where is the box?
+Nitin, at the end of the comment.
I always thought induction motors had more torque and speed. So by adding the RL, this is now the motor with the most torque.
Great video so much helpfull
Great job ... Over the top
Fantastic graphics!
According to My Experience this video is best for learning
#TeachinicalEngineer
@3:02 I paused the video and observed. The direction of electro magnetic force shown in the animation is wrong. Use F=Current *(Vector product of L and B)
L= vector having magnitude= length of conductor and directed along the direction of current and B is the STATOR MAGNETIC FIELD VECTOR. Using right hand rule, we get the direction of electro magnetic force to be opposite of that shown in the animation.
Please correct me if I am wrong.
Ac is wonderful to work with. Paralel wiring of motors will produce adaquete thrust. Series wirring of motors will produce perpetual motion.