Hi, very nice video! Since you guys are talking about induction motors specifically, I would also mention that the rotor spins at a slower speed than the stator magnetic field (for an induction motor). The difference between the stator field's speed and the rotor's speed is called the slip speed and is a central object in induction motor control. The animation shows the rotor and stator spinning at the same speed, which is how it works in synchronous motors (synchronous => same => same speed). Also, the induction motor effectively works something like a transformer (with the stator being the primary and the rotor's bars kind of like a secondary). At least at an undergraduate level, we are taught to model induction motors in a very similar way to the circuit model for transformers. But, I understand this wasn't supposed to be a very technical overview. For anyone who would like more in-depth information, I suggest the book "Electrical Machines, Drives and Power Systems" by Theodore Wildi. :)
Very clear explanation the crux of the induction motor working - much better than some of the higher quality video productions here. In fact most of them miss to explain the key reason why the rotor actually rotates in contrast to your clear explanation. Thank you !
Great videos, Im retired from electrical field. Power Generation, Electrician, Lineman, Instructor... attended many classes rarely seen electrical basics presented completely accuratly, yes trouble shooting the instructor was my way of countering the boredom at times. You've done an exceptional series here, the subject materiel and supporting visuals are a great balance of keeping it short, simple yet very informative. i look forward to thd more advanced topics you hinted at. Heading over to get that cup of coffee you well deserved! Quick questio, where can I find a generator other than mechanically driven AC? Just kidding around. Thanks Paul DAColton
Those engineering professors were very bad at getting their point across. I feel some of them are just poor health and burnt out from the other things they were involved in.
One important missing part is an explanation of how the magnetic field is induced into the rotor. It is not a permanent magnet, as might be inferred from the animation., but rather is an electromagnet created by the current induced into the squirrel cage bars. How that occurs is not at all obvious, except to Nikola Tesla, who invented it. I, and most of us I think, need to have it explained.
Indeed. The Rotor N and S go around as in the annimation, BUT you are right the bars and therefore the rotor has a very small 'slip' so goes at a little lower speed so the annimation is sadly wrong. Hence the US call it an Asynchronous motor. The small 'slip' is to give us flux cutting and therefore the volts in the rotor bars and the current. It is tricky to annimate well and this one is very close as EVERYTHING is synchronous EXCEPT the rotor. Even the rotor current pattern (as the magnetic fields have to be synchronous.)
Thank you, glad I read the comments first before watching the video. I searched for induction motor to know how the magnetic field is induced since there is no permanent magnets presents.
If you think this was good, you should check out the newer version. Ridiculously better. How did you find this video btw? I need to update the link to the newer video
Thanks alot for your video here I found it really hard to understand the squirrel cage but You explained it well and clear more than our lecturers here. First time to watch your video Thanks
Well presented; in particular, the graphics showing how it works is clear. A bit further on, one could add that 3 phase motors are now often used under variable frequency, to control the speed - loads of them in use as ‘traction motors’ now, both on the roads and the railways. Traction motors are often also used as alternators for regenerative braking, so one could mention that they can be controlled that way round by varying the electrical load, either by charging batteries or feeding back into the supply grid. To some extent, this became possible due to the advent of high power electronics for dc/ac inverters (IGBT), but that’s another subject!
My question is: When the rotating stator field induces a field in the rotor, does the rotor chase the stator field or does the rotor get pushed around by the stator field (repelled by the like poles in the stator)? In other words, does the squirrel drive the cage or does the cage make the squirrel run?
Baldrick, if u explain more clearly i may be able to help u, by stator field do u mean magnetic field? Because a stator is a component of the motor i dont think theres any such thing as a stator field
9:00 Yellow will reach it's peak value first because when analyzing waveforms, we start from t=0 point. Red is in 3rd position. Please correct me if I am wrong. LOVE THE VID THO!!! :)
Obviously an ingenious individual that captures the pesky little varmint then puts it to work spinning its cage similar to the rotor except it relies on squirrel muscle instead of electrical input for rotation. Although direction is random whereas with a three-phase electric motor direction of rotation is easily determined and maintained by changing any two wiring connections.... simplicity itself especially for common backward inclined fans, or pumps in which direction is paramount for proper operation & corresponding amp draw.
Really nice and clear explanation and presentation with a bonus at the end that made me laugh because of the opposite direction of the shaft. :) but really.... WELL DONE! Thanks!
excellent video corresponding how to opposing mangetic fields, one in the rotor and the other in the stator, cause rotational movement. i see these machines in fire pump rooms. thanks
I think it's helpful to visualize the stator as the primary coil of a transformer, with the shorted field of the rotor as the secondary side of the transformer. That's how the field can be induced into the rotor without brushes. (Tesla's goal was to eliminate the brushes) Asynchronicity (inherent slip) is an important characteristic of induction motors which needs to be explained. This is why they are also referred to as "asynchronous motors". Due to Lenz's law, the rotor has to actually lag behind the rotating magnetic field in the stator for the induced current to occur in the rotor. If the rotor actually catches up, the induced current in the rotor fades away. So the operating speed will always be less than the synchronous speed.
I get it (I think), with 3 phase the gaps between peaks (and troughs) are smaller than with 1 phase, so you get close to a direct current effect which is continuous, hence more power?
Well today is the day I learned that the fan, brings in air to the fins on the ends of the pump keeping it cool wow. But think the cover for the fun, helps guide the win to the fins?
My electrical engineering professor was excellent, but when I asked him when we get to see motors, he said that's another course. Between Jerome fielding and this , I understand three phase induction motors
My question is: When the rotating stator field induces a field in the rotor, does the rotor chase the stator field or does the rotor get pushed around by the stator field (repelled by the like poles in the stator)? In other words, does the squirrel drive the cage or does the cage make the squirrel run?
Can you explain control rotation on a 3 phase motor? Ive been told you have to just swap any 2 phases to put then 180 out of phase but i never understood that because there still being a third phase. maybe im overthinking it.
In your example at 9:30, your magnetic field is going the wrong way. And in the sine wave the strength actually goes R B Y R B Y, not R Y B R Y B like you explained. Because the after the positive R peak, the next strongest was the negative B peak, then the positive W, then the negative R, then the positive B, then the negative W, the back to positive R.
Hai, Is it possible to use squirel cage motor Instead of slip ring motor by connecting with vfd and run at lower frequency at the satrting for higher torque purpose?
Great videos, compared to other videos, the audio is rather low? Thought it was me, however, the ads attached, are at a uncomfortable level, then your voice is awfully low. Thank you.
Thanks a lot for all your teaching videos. How do you manage subtitles in foreign langage ? I'm french and even if I'm an english speaker, it would nice to translate in french in a better way than the automatic translation.
It was open to the community to edit but RUclips removed this feature last week unfortunately. Do you know we have a French channel? Link :ruclips.net/channel/UCpVHVdo-eYw_H_-rEXWlsZw
What device is used to manipulate the magnetic fields on the rotor? I know armatures are used on small dc motors with brush contacts, but how do you make an electrical connection to the moving rotor? *Update* I found out that DC motors that use only wire to generate both fields on the rotor and on the stator are referred to as 'Series wound' electric motors. They typically use a commutator with carbon brushes to contact the moving rotor - thus changing which coil is creating a magnetic field on the rotor.
Great explanation. I have been looking for a video like this one. But I still struggle to understand the neutral wire for both configuration. Is it internal using the casing or the phase wire doubles for that. Thanks.
Something that always bothered me is the face that I can't seem to come up with a good explanation of why the rotor of an induction motor works. In the example of a permanent magnet motor it's super obvious, but trying to explain how those simple hunks of metal work in the rotor isn't obvious to most people.
The rotor becomes a temporary magnet when power is applied. The brushes supply power to the commutator( the conductors that run across the rotor illustrated in the video) and this is what gives this hunk of metal it's magnetic property.
Hello i had a doubt regarding the same I was just wondering as it is said that these motors are used to pump water. So how exactly will the electricity reach there? If you could help me out with this it will be great. Regards, Saisha
I'm not so sure, but at the minute of 8:29, I think the magnetic field should be vertical instead of horizontal, so please respond to me with the right answer, thanks a lot !
Please see the newer version ruclips.net/video/59HBoIXzX_c/видео.html Also, how did you find this old video? Is it linked somewhere. I need to update the link if so
I have one small doubt about how the magnetic field could create or induced another magnetic field , which means that how the stator will create magnetic field to the rotors. I know only when the current passes only magentic field will create can you please explain how it's happening.???
so when north is up ... the sine wave is peaking up +... meaning the flow is counter clockwise, and when the north is down ( south up ) the sine is drawn negative down meaning flow is clockwise? Is that part of the illustration correct is this the orientation of the sine wave thanks!
Man, can you tack in back emf in this explanation about three phase motors and generators ? Why coils in your examples changed the direction of magnetic field instantly?
If the cage end caps are shorted, how is there an organized flow of current on the squirrel cage bars? Ie: how come the current isn't randomized and doesn't make the rotor do weird things?
So is the magnetic field created on the rotor bars attracted to the field of the stator or repelled by it? Nobody really explains the direction of the induced current on the bars and how we can work this out and the henceforth produced magnetic field, how do we explain the direction of the forces created by induction?
i have noticed something that i would like to ask an engineer about... in DC motors u have the coils inducing a magnetic field that works against a PERMANENT ferrite(black iron cobalt magnet) magnet in order to turn... but in AC induction motors the the coils are stationary on the stator so in my mind the magnetic force to work against the coils' magnetic force must come from the rotor, but I have opened an AC house fan before and i saw that the rotor has minimal to weak at best to noo magnetism on it to counter the coils,, so my question is, HOW can they be so strong and fast is the magnetic field that is responsible for the turning is so weak?
The key is in the name: Induction Motor. The electric current through the stator coils produces a magnetic field from the stator which cuts across the rotor, inducing an electric current in it which then produces its own magnetic field, which naturally opposes the magnetic field from the stator. The rotor turns because its induced opposing magnetic field is "trying to get away from" the stator's magnetic field. The stator can never complete this action because the alternating current keeps changing the magnetic field, so the stator keeps on turning so long as the alternating current exists. Or more simply, the stator's magnetic field turns the rotor into a magnet, temporarily. You can see a related effect if you hang a chain of paper clips from a magnet. If you hang onto the first paper clip, closest to the magnet, and move the magnet away, all the other paper clips fall away.
Hi there I'm a motor winder and mechanic. Essentially there are two types of capacitors used in a motor. A run capacitor and a start capacitor. The run capacitor, which is usually a silver canister, is mostly used for efficiencies these days. It helps to clean up the sine waves and allow for cleaner current. Start capacitors are normally a black plastic canister. These build up a generally much larger charge and are in series with the start windings of the motor. When the motor starts these take on a charge and are discharged into the start windings giving the motor the extra torque needed to start in a short amount of time.
@3:06 you mention, you can see the inductors here, but im not seeiing what you mean and its not an intuitive picture or explanation of what the inductors are/look like. Please clarify that and their purpose.
⚠️ *Watch the new version of this video* ➡️➡️ ruclips.net/video/59HBoIXzX_c/видео.html
Hi, very nice video! Since you guys are talking about induction motors specifically, I would also mention that the rotor spins at a slower speed than the stator magnetic field (for an induction motor). The difference between the stator field's speed and the rotor's speed is called the slip speed and is a central object in induction motor control. The animation shows the rotor and stator spinning at the same speed, which is how it works in synchronous motors (synchronous => same => same speed).
Also, the induction motor effectively works something like a transformer (with the stator being the primary and the rotor's bars kind of like a secondary). At least at an undergraduate level, we are taught to model induction motors in a very similar way to the circuit model for transformers.
But, I understand this wasn't supposed to be a very technical overview. For anyone who would like more in-depth information, I suggest the book "Electrical Machines, Drives and Power Systems" by Theodore Wildi. :)
NEW! Check how AC motor works here ruclips.net/video/59HBoIXzX_c/видео.html
Very clear explanation the crux of the induction motor working - much better than some of the higher quality video productions here. In fact most of them
miss to explain the key reason why the rotor actually rotates in contrast to your clear explanation. Thank you !
Great videos, Im retired from electrical field. Power Generation, Electrician, Lineman, Instructor... attended many classes rarely seen electrical basics presented completely accuratly, yes trouble shooting the instructor was my way of countering the boredom at times. You've done an exceptional series here, the subject materiel and supporting visuals are a great balance of keeping it short, simple yet very informative. i look forward to thd more advanced topics you hinted at. Heading over to get that cup of coffee you well deserved!
Quick questio, where can I find a generator other than mechanically driven AC? Just kidding around. Thanks Paul
DAColton
Thank you guys very much I spent 5 years in the school of engineering never getting a clear vision on this particular concept
Those engineering professors were very bad at getting their point across. I feel some of them are just poor health and burnt out from the other things they were involved in.
I'm actually a 14-year old with an interest in electrical engineering and I want to say I really enjoyed the video. Thank you very much.
You should be around 17 or 18 now. Are you in college for electrical engineering now?
It's funny how the introduction of this video is also the sound of an induction motor starting up. 😁
table saw
Like every video?
In 90-s there was a strategic game called "Totall annihalation", and there was a sound like that when robot producing factory were finishing the one
i can't thank you well enough! i was loosing sleep because of this but now that i understand i can finally move on
Thank you sir because of you i might just get a plant engineering apprenticeship at my job
Same here and I'm really happy about it
One important missing part is an explanation of how the magnetic field is induced into the rotor. It is not a permanent magnet, as might be inferred from the animation., but rather is an electromagnet created by the current induced into the squirrel cage bars. How that occurs is not at all obvious, except to Nikola Tesla, who invented it. I, and most of us I think, need to have it explained.
Indeed. The Rotor N and S go around as in the annimation, BUT you are right the bars and therefore the rotor has a very small 'slip' so goes at a little lower speed so the annimation is sadly wrong. Hence the US call it an Asynchronous motor. The small 'slip' is to give us flux cutting and therefore the volts in the rotor bars and the current. It is tricky to annimate well and this one is very close as EVERYTHING is synchronous EXCEPT the rotor. Even the rotor current pattern (as the magnetic fields have to be synchronous.)
Thank you, glad I read the comments first before watching the video. I searched for induction motor to know how the magnetic field is induced since there is no permanent magnets presents.
imagine inventing something only for your last name to be used to name a car brand that uses your technology
NEW! Check how AC motor works here ruclips.net/video/59HBoIXzX_c/видео.html
Only 218 comments? I can't believe it!!! You have no idea HOW much I have wanted to understand how a motor worked!!! THANK-YOU!!!!
If you think this was good, you should check out the newer version. Ridiculously better.
How did you find this video btw? I need to update the link to the newer video
This vid is so much quieter than the rest in the series (just letting you know ;))
simple but powerful. it is a spoon feed video. Thanks a lot!
Thanks alot for your video here
I found it really hard to understand the squirrel cage but
You explained it well and clear more than our lecturers here.
First time to watch your video
Thanks
Well presented; in particular, the graphics showing how it works is clear.
A bit further on, one could add that 3 phase motors are now often used under variable frequency, to control the speed - loads of them in use as ‘traction motors’ now, both on the roads and the railways. Traction motors are often also used as alternators for regenerative braking, so one could mention that they can be controlled that way round by varying the electrical load, either by charging batteries or feeding back into the supply grid.
To some extent, this became possible due to the advent of high power electronics for dc/ac inverters (IGBT), but that’s another subject!
VFD Video is now live! here: ruclips.net/video/yEPe7RDtkgo/видео.html
⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕
PayPal: www.paypal.me/TheEngineerinMindset
My question is: When the rotating stator field induces a field in the rotor, does the rotor chase the stator field or does the rotor get pushed around by the stator field (repelled by the like poles in the stator)? In other words, does the squirrel drive the cage or does the cage make the squirrel run?
Baldrick, if u explain more clearly i may be able to help u, by stator field do u mean magnetic field? Because a stator is a component of the motor i dont think theres any such thing as a stator field
The clearest explanations i have ever seen 😊 Thank you sooooooo... much 😊 i cant believe there would be such an amazing explanation 🤗🤗🤗
perfect logical and conceptual explaination of topic it destroyed all confusion from my mind and made a perfect clear picture with animation
9:00 Yellow will reach it's peak value first because when analyzing waveforms, we start from t=0 point. Red is in 3rd position. Please correct me if I am wrong. LOVE THE VID THO!!! :)
Thanks a lot friend you are a top-notch teacher
A thought I have many times when working with motors is "Who keeps squirrels in cages anyway?!"
Whenever I heard the term, I always thought of the hamster and mouse exercise wheels rather than actual cages.
It's supposed to be a cage to keep squirrels out.
Obviously an ingenious individual that captures the pesky little varmint then puts it to work spinning its cage similar to the rotor except it relies on squirrel muscle instead of electrical input for rotation. Although direction is random whereas with a three-phase electric motor direction of rotation is easily determined and maintained by changing any two wiring connections.... simplicity itself especially for common backward inclined fans, or pumps in which direction is paramount for proper operation & corresponding amp draw.
Best Animation !! You showed... Thanks a lot 😀
thank you for these videos we are looking for more please keep it up
The conductors are in slightly cross because, to prevent the magnetic locking and not for to increase torque 🙂
You nailed it! Thank you so much. You made my day.
Dude, you make nice animations, keep it up. they solve my problems
Really nice and clear explanation and presentation with a bonus at the end that made me laugh because of the opposite direction of the shaft. :) but really.... WELL DONE! Thanks!
excellent video corresponding how to opposing mangetic fields, one in the rotor and the other in the stator, cause rotational movement. i see these machines in fire pump rooms. thanks
Just come across this Channel. Great vids, great explanations and a great refresher for me, thank you!
Bravo! I love your lessons!
Excellent video explanation
Good for basic understanding
Very nicely explained.
These are great videos!
Superb ExplanaTi0n❤❤❤
great work, Sir! thank you for the video!
I like the motor firing up at the beginning of the video
I think it's helpful to visualize the stator as the primary coil of a transformer, with the shorted field of the rotor as the secondary side of the transformer. That's how the field can be induced into the rotor without brushes. (Tesla's goal was to eliminate the brushes) Asynchronicity (inherent slip) is an important characteristic of induction motors which needs to be explained. This is why they are also referred to as "asynchronous motors". Due to Lenz's law, the rotor has to actually lag behind the rotating magnetic field in the stator for the induced current to occur in the rotor. If the rotor actually catches up, the induced current in the rotor fades away. So the operating speed will always be less than the synchronous speed.
NEW! Check how AC motor works here ruclips.net/video/59HBoIXzX_c/видео.html
Fantastic video
Thank you so much for this 🤩🤗🤗😍😍😍!!!!!
You just saved my life, lol 🥰
This new version is far better ruclips.net/video/59HBoIXzX_c/видео.html
Thanks very much!
I get it (I think), with 3 phase the gaps between peaks (and troughs) are smaller than with 1 phase, so you get close to a direct current effect which is continuous, hence more power?
Excellent description
Well today is the day I learned that the fan, brings in air to the fins on the ends of the pump keeping it cool wow. But think the cover for the fun, helps guide the win to the fins?
Please produce a video of a single phase induction motor with capacitor start/run.
please see our video on circulating pumps
My electrical engineering professor was excellent, but when I asked him when we get to see motors, he said that's another course. Between Jerome fielding and this , I understand three phase induction motors
Jerome fielding is great at demonstrating these motors with small hand built models.
the sound is too low,
Pedro Ramirez thank god we can turn our volume up
Our phones have sound buttons for controllingthe sound bro.
I have all volume controls at Max and still cannot hear his lecture
It's excellent presentation you are very good my friend thank you.
Can u explain I can't understand one thing How the rotor will get the magnetic field without power supply ??? Only stator have the power supply.
Hello the engineering mindset.. . Can you maybe make video how generators/alternator works. Thanks 😊
Already made: ruclips.net/video/jdSKlg80DjU/видео.html
@@EngineeringMindset ohhh yes thanks you 😊
8:21 Still the BEST explanation I seen
Wow this just excellent!
My question is: When the rotating stator field induces a field in the rotor, does the rotor chase the stator field or does the rotor get pushed around by the stator field (repelled by the like poles in the stator)? In other words, does the squirrel drive the cage or does the cage make the squirrel run?
Thanks we love you
Sir please upload video of berry type transformer deeply. Its useful to all and this topic is no one done correct.
Thanks for the video mate, big help and much appreciated 👍. Liked and subbed
Great Video. THX.
Hi :) in 9:33 ithink it should be: "Place the rotor inside", not "Place the stator inside". Right?
Glad I'm not the only one who was confused for a minute haha
Can you explain control rotation on a 3 phase motor? Ive been told you have to just swap any 2 phases to put then 180 out of phase but i never understood that because there still being a third phase. maybe im overthinking it.
In your example at 9:30, your magnetic field is going the wrong way. And in the sine wave the strength actually goes R B Y R B Y, not R Y B R Y B like you explained. Because the after the positive R peak, the next strongest was the negative B peak, then the positive W, then the negative R, then the positive B, then the negative W, the back to positive R.
Excellent video.
How universal motor work on both supply AC as well as DC.
Please make a video 👆👆
Cool video
can you do a vid on radians and how to use them to measure an engine's ability to lift (helicopter) and other uses for it?
Hai,
Is it possible to use squirel cage motor Instead of slip ring motor by connecting with vfd and run at lower frequency at the satrting for higher torque purpose?
Could you do a video on variable frequency drives?
VFD Video is now live! here: ruclips.net/video/yEPe7RDtkgo/видео.html
very very well
Great videos, compared to other videos, the audio is rather low? Thought it was me, however, the ads attached, are at a uncomfortable level, then your voice is awfully low. Thank you.
Good
Make a video on Armatute windings and methods of starting
i have a question. the wounded coil across the stator plays as an inductor ? or what ? what inductor is used for ?
love your content !
New induction motor video coming on Wednesday
NEW! Check how AC motor works here ruclips.net/video/59HBoIXzX_c/видео.html
Thanks a lot for all your teaching videos. How do you manage subtitles in foreign langage ? I'm french and even if I'm an english speaker, it would nice to translate in french in a better way than the automatic translation.
It was open to the community to edit but RUclips removed this feature last week unfortunately.
Do you know we have a French channel? Link :ruclips.net/channel/UCpVHVdo-eYw_H_-rEXWlsZw
What device is used to manipulate the magnetic fields on the rotor? I know armatures are used on small dc motors with brush contacts, but how do you make an electrical connection to the moving rotor?
*Update*
I found out that DC motors that use only wire to generate both fields on the rotor and on the stator are referred to as 'Series wound' electric motors. They typically use a commutator with carbon brushes to contact the moving rotor - thus changing which coil is creating a magnetic field on the rotor.
DC motors explained ruclips.net/video/GQatiB-JHdI/видео.html
Thank you so much!
Great explanation. I have been looking for a video like this one. But I still struggle to understand the neutral wire for both configuration. Is it internal using the casing or the phase wire doubles for that. Thanks.
ruclips.net/video/59HBoIXzX_c/видео.html
Something that always bothered me is the face that I can't seem to come up with a good explanation of why the rotor of an induction motor works. In the example of a permanent magnet motor it's super obvious, but trying to explain how those simple hunks of metal work in the rotor isn't obvious to most people.
It's not obvious to me.
The rotor becomes a temporary magnet when power is applied. The brushes supply power to the commutator( the conductors that run across the rotor illustrated in the video) and this is what gives this hunk of metal it's magnetic property.
@@anthonyjones634 Commutators are used in DC motors.
Hello i had a doubt regarding the same
I was just wondering as it is said that these motors are used to pump water.
So how exactly will the electricity reach there?
If you could help me out with this it will be great.
Regards,
Saisha
Please see our centrifugal pump video, fully explained the motor tok
I'm not so sure, but at the minute of 8:29, I think the magnetic field should be vertical instead of horizontal, so please respond to me with the right answer, thanks a lot !
Please see the newer version ruclips.net/video/59HBoIXzX_c/видео.html
Also, how did you find this old video? Is it linked somewhere. I need to update the link if so
I have one small doubt about how the magnetic field could create or induced another magnetic field , which means that how the stator will create magnetic field to the rotors. I know only when the current passes only magentic field will create can you please explain how it's happening.???
so when north is up ... the sine wave is peaking up +... meaning the flow is counter clockwise, and when the north is down ( south up ) the sine is drawn negative down meaning flow is clockwise? Is that part of the illustration correct is this the orientation of the sine wave thanks!
Thank you
Please see the newer version, much better
@@EngineeringMindset I just did, thank you so much. Second video simple shows how much you love your work. It's amazing.
where is the wave washer use in bearing? what is the purpose?
Awesome content like it:)
Does the looped wire need to be insulated against itself. If that makes sense.
Is there an error 9:34 "We can then place the stator inside"...shouldn't that be "rotor"?
2:37 The stator is made up with magnets right?
Just for CC motors
Man, can you tack in back emf in this explanation about three phase motors and generators ? Why coils in your examples changed the direction of magnetic field instantly?
Please see the new video on our channel for electric motors
If the cage end caps are shorted, how is there an organized flow of current on the squirrel cage bars? Ie: how come the current isn't randomized and doesn't make the rotor do weird things?
why the rotor bars are skewed ?and how does the skewing woking principle works ?
Causes an unequal magnetic field which helps it spin
Re 9.55. Surely opposite poles ATTRACT not repel as stated here and as the rotor lags behind it is pulled round.
So is the magnetic field created on the rotor bars attracted to the field of the stator or repelled by it? Nobody really explains the direction of the induced current on the bars and how we can work this out and the henceforth produced magnetic field, how do we explain the direction of the forces created by induction?
i have noticed something that i would like to ask an engineer about... in DC motors u have the coils inducing a magnetic field that works against a PERMANENT ferrite(black iron cobalt magnet) magnet in order to turn... but in AC induction motors the the coils are stationary on the stator so in my mind the magnetic force to work against the coils' magnetic force must come from the rotor, but I have opened an AC house fan before and i saw that the rotor has minimal to weak at best to noo magnetism on it to counter the coils,, so my question is,
HOW can they be so strong and fast is the magnetic field that is responsible for the turning is so weak?
The key is in the name: Induction Motor.
The electric current through the stator coils produces a magnetic field from the stator which cuts across the rotor, inducing an electric current in it which then produces its own magnetic field, which naturally opposes the magnetic field from the stator. The rotor turns because its induced opposing magnetic field is "trying to get away from" the stator's magnetic field.
The stator can never complete this action because the alternating current keeps changing the magnetic field, so the stator keeps on turning so long as the alternating current exists.
Or more simply, the stator's magnetic field turns the rotor into a magnet, temporarily.
You can see a related effect if you hang a chain of paper clips from a magnet. If you hang onto the first paper clip, closest to the magnet, and move the magnet away, all the other paper clips fall away.
DC motors explained ruclips.net/video/GQatiB-JHdI/видео.html
Please explain how the capacitors help in starting of a 1-phase induction motor
Hi there I'm a motor winder and mechanic. Essentially there are two types of capacitors used in a motor. A run capacitor and a start capacitor. The run capacitor, which is usually a silver canister, is mostly used for efficiencies these days. It helps to clean up the sine waves and allow for cleaner current. Start capacitors are normally a black plastic canister. These build up a generally much larger charge and are in series with the start windings of the motor. When the motor starts these take on a charge and are discharged into the start windings giving the motor the extra torque needed to start in a short amount of time.
bro please make vedeo about basic principle of operation (AC and DC servo motor with brake) .
DC motors explained ruclips.net/video/GQatiB-JHdI/видео.html
NEW! Check how AC motor works here ruclips.net/video/59HBoIXzX_c/видео.html
Has anyone else noticed that the cogs in the logo will jam rather than turn? That's pretty much what my brain was like during my engineering degree.
You can't tell if the gears are all interlocked or staggering from that perspective. If they are staggered they won't jam.
I do want to know more about motors dor you have any explanation about Three phase motors? Like hysteresis motors? Love your videos it helps me a lot.
was the hot spot a sign of pontential future problems ?
Yes, the insulation can deteriorate and cause a short circuit.
This would be great if i could hear it
Please see our new version of the video, much better quality
@@EngineeringMindset Thankyou! I should have noticed the new one
@3:06 you mention, you can see the inductors here, but im not seeiing what you mean and its not an intuitive picture or explanation of what the inductors are/look like. Please clarify that and their purpose.