How does an Induction Motor work how it works 3 phase motor ac motor
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Date: 2023-11-17
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Comments and reviews: 30
Jarrod
5: 58 so why are the conductor bars angled like that what purpose does that serve in a more detailed sense.
2. also at the end the magnetic field of the coils, its really hard to visualize and get an intuitive sense of the timing of the magnetic fields and how they are able to synchronize with each other to keep the momentum going.
3. I wonder about inefficiencies, because the wires are so blended together they aren't clean in an actual image or construction of the motor, there are tons of stranded wires seeming all over the place and you didn't mention the method behind the madness. its all so messy looking and its hard to imagine that mess is a precise science and engineering design, it makes me wonder the effectiveness of the design principles and how it (assumingly) comes together very well.
4. you didn't explain the reason for the stranded wires in the actual construction and why there are so many and it looks basically chaotic looking even though i presume its not.
5. i wonder if since there are so many wires in there, if there is inefficiency, or canceling of magnetic fields, etc.
6. can you clarify the shorting out of the end rings, what is being shorted out or how? and their purpose and the science behind it?
7. you didnt really explain the eddy current problem and it would have been nice to visualize as that is important and why we have laminated sheets.
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5: 58 so why are the conductor bars angled like that what purpose does that serve in a more detailed sense.
2. also at the end the magnetic field of the coils, its really hard to visualize and get an intuitive sense of the timing of the magnetic fields and how they are able to synchronize with each other to keep the momentum going.
3. I wonder about inefficiencies, because the wires are so blended together they aren't clean in an actual image or construction of the motor, there are tons of stranded wires seeming all over the place and you didn't mention the method behind the madness. its all so messy looking and its hard to imagine that mess is a precise science and engineering design, it makes me wonder the effectiveness of the design principles and how it (assumingly) comes together very well.
4. you didn't explain the reason for the stranded wires in the actual construction and why there are so many and it looks basically chaotic looking even though i presume its not.
5. i wonder if since there are so many wires in there, if there is inefficiency, or canceling of magnetic fields, etc.
6. can you clarify the shorting out of the end rings, what is being shorted out or how? and their purpose and the science behind it?
7. you didnt really explain the eddy current problem and it would have been nice to visualize as that is important and why we have laminated sheets.
reply
Nidhin
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. :)
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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. :)
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alfajuj
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.
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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.
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derek
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
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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
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John
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 thats another subject!
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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 thats another subject!
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Slavisa
Most important thing is not explained why is called async motor. Current induced in rotor cage wires depends how much rotor is behind rotating magnetic field. when is idling, no load case, power consumption is zero. When load is applied current in cage goes up and cage is catching up with rotating magnetic field. Sync motors were developed before Tesla's patent but were not suitable for industrial use because they were taking nominal power in idle mode and were prone to stop on load change because sync mode was broken.
Tesla's async motor made AC power to have advantage over DC power for industrial usage.
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Most important thing is not explained why is called async motor. Current induced in rotor cage wires depends how much rotor is behind rotating magnetic field. when is idling, no load case, power consumption is zero. When load is applied current in cage goes up and cage is catching up with rotating magnetic field. Sync motors were developed before Tesla's patent but were not suitable for industrial use because they were taking nominal power in idle mode and were prone to stop on load change because sync mode was broken.
Tesla's async motor made AC power to have advantage over DC power for industrial usage.
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user
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.
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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.
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Ryan
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.
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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.
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Baldrick
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?
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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?
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VIGNESH
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?
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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?
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Saisha
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
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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
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Jean-Nicolas
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.
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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.
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Mighty
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.
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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.
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brofist
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.
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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.
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Jarrod
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.
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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.
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Rereao
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
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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
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Gerardo
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?
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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?
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Abhinandh
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! :)
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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! :)
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oliver
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
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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
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DeDustMet
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?
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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?
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ba
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!
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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!
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Azeem
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?
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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?
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nicoletgee
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.
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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.
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Richard
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.
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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.
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Devanshu
perfect logical and conceptual explaination of topic it destroyed all confusion from my mind and made a perfect clear picture with animation
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perfect logical and conceptual explaination of topic it destroyed all confusion from my mind and made a perfect clear picture with animation
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VIGNESH
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.
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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.
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Nwachukwu
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.
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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.
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Fifth
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!
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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!
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Veerabhadrayya
Sir please upload video of berry type transformer deeply. Its useful to all and this topic is no one done correct.
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Sir please upload video of berry type transformer deeply. Its useful to all and this topic is no one done correct.
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gojitmal1978
Should be more like brown, orange, yellow or black, red, blue. Can't really tell if it's 110-208 or 277-408 system.
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Should be more like brown, orange, yellow or black, red, blue. Can't really tell if it's 110-208 or 277-408 system.
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