Single Phase Induction Motor, How it works ? 

The only sad part is that a free video on youtube is more effective than the lessons at the college that i'm paying for...

it was very helpful. i see people are abusing because of the language and the speaking but it is really helpful for the non-native speakers and learners like us to understand these ambiguous topics while you explain these in simple English. thank you Learning Engineering. keep it up and ignore the English literature "GURUs" in the comment section

Complicated things made simple using such an extraordinary animation effects. It was a very helpful video. Thank you very much !!!

It's amazing how a great video like this with such painstaking visualisation can be uploaded for free on RU-vid, and still people complaining because of a missing definite article ('the'). Sense of entitlement.

Thank you. Very informative and actually dramatic. A sort of Asperger's Tesla action video with a capacitor as the hero who arrives just in time. Nothing cooler than clear, concise and accurate information.

all the videos are amazing!!! keep up the good work! life saver!

Not all single phase squirrel cage induction motors are like this, some use a start relay and start and run capacitors.The capacitors create a phantom phase to get the rotor to spin 360 otherwise you just get locked between the two phases, in other words all squirrel cage induction motors are really three phase, but when you only have single phase power you need capacitors to discharge voltage that induces current and gets the rotor to spin 360, once it's spinning you don't need the capacitor induced current, although you don't get the same horsepower out of a 1 phase motor as you would out of the exact same motor using three phases of power, so the motor is typically de-rated. For industrial applications that use 1 phase power and start under load like mechanical machinery or a water pump, your better off using a phase converter that takes 1phase and converts it to 3phase.

I feel like young student in your classroom at the age 63. Thanks Sir.

The part of the video concerning why a single-phase induction motor is not self-starting and how it can be started is SO CONFUSING. When you were explaining the reason why the rotor, which is already rotating, will keep on rotating in the same direction after it is put inside the stator under the condition that the current only flows through the main winding, you said the magnetic field produced by the stator will cause the magnetic field inside the rotor to vary and thus induce a current in the rotor, thus "the rotor will start rotating" (which is confusing because you have assumed that the rotor is already rotating before it is immersed in the magnetic field produced by the stator). After that you explained since the net torque on the rotor produced by the two oppositely rotating magnetic fields produced by the stator is zero, the rotor will not start, which seemingly contradicts what you have said before that "the rotor will start rotating". It is better for you to first say that if no current is flowing through the auxiliary winding and the rotor does not have any initial rotation, since the net torque on the rotor produced by the two oppositely rotating magnetic fields produced by the stator is zero, the rotor will not start. And then explain why the rotor will keep on rotating in the same direction if the rotor has initial rotation. Finally tell us the initial rotation is provided using the auxiliary winding connecting in series with a capacitor. Last but not least, you forgot to mention that the capacitor introduced a phase difference between the main and auxiliary windings, so the sum of the fluctuating magnetic fields produced by the rotor and the stator will become a rotating magnetic field. If the auxiliary winding is not connected to the capacitor, even if there is current flowing through the auxiliary winding, there will be little phase difference between the main and auxiliary windings, so the sum of the fluctuating magnetic fields produced by the rotor and the stator will still be a merely fluctuating but not rotating magnetic field and the rotor still cannot start.

This is awesome. All animated and visualised points.Thank you.

These videos made life of engineering students way easier.... We don't have to imaging anymore.

Awesome visualisation.... Better than any class that would take 1 hour to explain this 4 min stuff..

3d animation of any system is like imagination of our mind so nice imagination.....

In single phase motor there are 2 oppositely reovling magentic fields. They will produce opposing torque on rotor. While in 3 phase motor there is only one RMF, so capacitor is not needed.

i didnt understand the capacitor part for the self starting...if the auxiliary winding produces 2 fields rotating in the opposite directions , and if it cancels out one of the fields in the main winding , then it must cancel out the other one also right ?

The simplest explanation. Thank you all.

So well made

Annu Aparajita Adding a capacitor changes the phase angle and hence causes difference in the field produced. This will lead to increasing the force for one and decreasing for other

yes one neat trick I recently learned is that if your single phase induction motor is humming but not spinning, you can start it by hand, just twist the output shaft in either direction and watch it come to life, this is a dead giveaway that the starting capacitor is bad and needs to be replaced

I know how is the connection of this but for the sake of those who doesnt know it will be more helpfull if the uploader includes how is the connection between starting winding, running winding and capacitor.

I appreciate the simplified sentence structure.

Phantastic explanation

Thanks- this helped me figure out a problem with my pump motor

Back that days Nicola Tesla was born in imperial Austria, studied in imperial Austria and even worked a while in imperial Austria. Please correct, thanks.

Wish these vids to be added as reference in the syllabus

NICE VIDEO BY THE WAY!!!

The only part I don't understand is, once you put the rotating rotor inside the cage, why does it keep rotating and not eventually slow down. I understand the initial imbalance of torque, but once you turn off the auxiliary winding current this imbalance should fade should it not (similar to how if you push something it doesn't keep moving forever, eventually it slows). Eventually the torque due to that initial motion should fade and you should just be left with a net torque of zero??

These videos are really helpful. They should have more views!

Keep it up with this type most Interesting videos for study of electric engineering

The lack of the word the is killing me

Great Video . Really supplemented my awesome teachers uber fun lessons. Gerry Rocks!!!!

Superb explanation for ee engineering students

These videos worth alot.......💯💯

Nikola Tesla is one of the most underrated geniuses of all time. Many people are familiar with his name but most have no idea of his contributions to science and engineering.

I want all this videos to explain details about basics and add some more topics in easier way

I understood clearly. Thankyou sir

Nice video !! :) Btw , if the auxiliary winding produces 2 fields rotating in the opposite directions , and if it cancels out one of the fields in the main winding , then it must cancel out the other one also right ?

Really good explanation with good visuals. Understood it clearly.

Thanks for this video, it was very informative. At 0:54, isn't North and South supposed to be the other way?

I am confused. Question 1: Does the capacitor only serve to help start the motor or it is required during the normal operation of the motor? Question2: Why does the motor keep on rotating(with or without load) if there are two counter rotating magnetic field which have same magnitude and angular velocity. I thought the field which rotates opposite to the rotor should produce more torque on the rotor and therefore it should slows down, shouldn't it?

thanks for your explaination it saves from reading 20 pages pdf

Thank you for your wonderful animation!!!!!!........was really helpful

Very good graphics showing net magnetic field of rotor squirrel cage. Thank you

Nice animation.. easy to understand

Excellent explanation sir

I have watched the video till the end hoping to find additional informations about the working of the centrifugal switch, in the end only its name was mentioned...no luck Anyway nice video 👍

excellent job bro all ur videos are good to understand i think u revolution will be possible

Nice video bro

Thanks for explaining so nicely

Great visualisation

This is exactly what I needed 👍

This is amazing! But could you please tell me why do the two sets of blue current flow in the opposite direction to each other at 1:50? Thank you PS.I was trying to apply Flemming's left hand rule but the two parameters , current and force, were initially unknown at the squirrel cage in the first place. So I can't solve the problem.

2:32 won't the net torque be exhausted?

Hey bro you are such a great video

Very good explanation

This video was really helpful!! Thank you.

great tutor, many thanks!!!!!!!!!!!!!!!!!!!!!!!!!

Awesome video

Excellent video

2:55 Nikola Tesla wasn't a Yugoslavian, he was a Serbian born in Smiljan (in Austro-Hungarian Empire), which was after WWI a part of Kingdom of Serbs, Croats, and Slovenes, which later changed its name in Kingdom of Yugoslavia, and after WWII changed to Socialist Federal Republic of Yugoslavia, and after Yugo wars it's now in modern Croatia. Tesla went to America long before all of that and made his inventions there, so you can say that he was a Serbian-American inventer.

what a great channel this is!

Unique is every videos,thanks

Thaks ENGINEERS for this beautiful world

Awesome video 👏

Should the magnetic field polarities shown at 0.55 time of the video be reversed according to the arrows current flow?

Great video ,easy to understand What do u use for making such videos

Awesome channel..❤️❤️❤️ Very helpful content..🔥🔥

Beautiful explaination

very nice explanation,Thank You

Absolute masterpiece

I thought the capacitor knocked one coil off by a few degrees, which imparted a torque? essentially creating a two phase motor until the capacitor circuit switches off...

this is really helping, nice video.

GOOD JOB BOSS...KEEP IT UP... UPLOAD MORE

3:26 The auxillary winding will also produce 2 oppositely revolving mag fields and how will it cancel one torque if the other gets added up? If one torque is added up then the other , the opposite one, will also get added up right?

Doesn’t the capacitor just create a phase shift for the secondary winding so you have 2 different phases at different degrees to start the rotor rotation? I was under the impression almost all single phase induction motors were actually a 2 phase setup for start or start/run operation. Maybe thats what this video tried to explain but I think it just confused the hell out of me or I learned wrong years ago. This hurt my brain! I have no idea how I ended up here. I got lost in RU-vid again.

Good Explaination

interesting video , but there is wrong in the direction of field in the main winding the (N) must be alternative (S) , right ?

you're a life saver , THANKS

thanks and wecome to india

Can u also explain another subjects like mathematics

Thank uuuuh very muchhhh ❤❤🥰🥰🥰🥰🥰

If you look at the magnetic field directions you'll notice that their resultant will point to one direction for a while and then it will reverse. So the motor shouldn't be able to rotate properly. It should try to go clockwise and then counter clockwise.

What happens introducing an inverter? If present, would the auxiliary winding still be needed?

when an ac supply is given to the auxillary winding ,it will produce two oppositely rotating magnetic fields ,you said that it will cancel out one of the main winding's magnetic field.but how is this possible? -a and -b be the rotating magnetic field of auxillary winding and let a and b be the magnetic field of main winding .Then -a+a -b+b = 0? So then the rotor should buzz again right?

Great video🙌 2:28 But can anyone understand how the forward torque becomes greater than the backward torque. Since the rotor emf induced by the backward rotating field is greater than that induced by the forward rotating field?

god bless u.. splendid work..

Superb sir

Good graphics.

I have question. When auxiliary winding also produce 2 opposites RMF, how can it makes one of then cancel main winding RMF and the other will get it up? I mean if theres 2 group of 2 opposites RMF, wouldnt they all cancel one another, and left no resultant?

thank you so much it was easy to learn with your video. :)

I still don't understand it. If the fields cancel each other out then how does giving it a nudge in either direction allows it to turn in that direction continuously. Is this like in space where a push in any direction can give continuous motion in that direction as there is no friction? Do these fields cancel out friction? Wouldn't you think that the start from the start winding would only last for a brief few rotations?

Can anyone among u clear my basic concept about how the 2 rmf created by Auxi winding only cancels 1 rmf of main winding & strengthend the other??? Should it not b cancel out both???

Thanks for the video ,but When we apply the right-hand rule, we find that you have revers between magnetic north and south ، can anyone explain that ?

this is awesome. thanks so much...

well done video. Thanks!!!

Why the auxiliary winding needs to be cut after the rotor starts rotating? Isn't it better to have a single strong rotating field at all times, instead of two opposite weaker rotating fields?

Thank you

I'm still wondering why wouldn't the 2 opposites magnetic fields create by the auxilary winding don't cancel each other ? instead 1 actually cancel the magnetic field of the main winding and 1 enhance the other of the main winding ?

erm, an induction motor is supposed to be brushless, so how is the centrifugal switch mechanically on the rotor but electrically on the stator if there are no brushes? I assume this is considered a minor detail since the brushes would only carry current to the auxilliary winding during startup and thus not suffer from arcing damage as much - but they would still experience some friction wear. Also the brushes would connect for all 360 degrees of revolution unlike a dc motors commutator brushes so arcing would be less than for a commutator.

I HAVE A DOUBT. ISTEAD OF TORQUE CAN'T IT BE SAID THAT "INITIALLY" A COUPLE ACTS ON THE ROTOR AND THEN THE TORQUE...???