Induction Motors – Why and how an induction motor works

Induction Motors – Why and how an induction motor works


A simple induction motor consists of a metal cage placed inside three coils of wire. As we apply an alternating voltage to the three coils, the metal cage experiences a force, causing it to rotate. To understand how and why an induction motor works, we only need to know two facts about electromagnetism. The first fact is that particles with the same charge moving in the same direction exert an attractive magnetic force on one another… and that particles with the same charge moving in opposite directions exert a repulsive magnetic force on one another. The second fact is that all moving charged particles create magnetic fields, and that magnetic fields do not like to change. Whenever we try to change a magnetic field, it will create an electric field which will try to move charged particles in such a way so as to cancel out this change. The moving charged particles in each of the three coils create magnetic fields as is shown. These three magnetic fields add together to produce a total magnetic field that is rotating in space. The effect of this rotating magnetic field is the same as it would be if it was produced by just a single rotating ring of moving charged particles. To understand the effect of this rotating magnetic field on the metal cage, let us first consider just one loop of the metal cage, which we can think of as a metal ring. As the magnetic field rotates, the strength of the magnetic field flowing through the loop is constantly changing. Magnetic fields do not like to change. If we have two rings of charged particles, and we try to reduce the magnetic field through the loops by stopping the rotating ring, the stationary ring will then start to rotate in the same direction as the first, so as to try to keep the magnetic field through the loop constant. If we try to increase the magnetic field through the loops by increasing the rotation of one of the rings, then the other ring will react by rotating in the opposite direction so as to cancel out this increase, and so as to again try to keep the magnetic field through the loop constant. As the moving ring rotates towards the metal loop, the strength of the magnetic field through the metal loop increases. As the rotating ring of charged particles rotates away from the metal ring, the strength of the magnetic field through the metal loop decreases. As the moving ring rotates towards the metal loop, the strength of the magnetic field through the metal loop increases. The metal loop consists of charged particles that are able to move through the metal. As the rotating ring rotates away from the metal loop, the strength of the magnetic field through the metal loop decreases, causing the charged particles in the metal loop to move in the same direction as the charged particles in the rotating ring, so as to keep the magnetic field constant. As the rotating ring rotates towards the metal loop, the strength of the magnetic field through the metal loop increases, causing the charged particles to move in the opposite direction of the charged particles in the rotating ring, so as to keep the magnetic field constant. As the rotating ring rotates away from the metal ring, the charged particles in the metal ring move in the same direction as the charged particles in the rotating ring. Particles with the same charge moving in the same direction create an attractive magnetic force on one another. As the rotating ring rotates towards from the metal ring, the charged particles in the metal ring move in the opposite direction as the charged particles in the rotating ring. Particles with the same charge moving in opposite directions exert a repulsive magnetic force on one another. As the rotating ring rotates away from the metal ring, the charged particles in the metal ring move in the same direction as the charged particles in the rotating ring. Particles with the same charge moving in the same direction create an attractive magnetic force on one another. In both cases, the metal ring feels a force causing it to rotate in the same direction as the rotation of the magnetic field. This is true for all the metal loops that make up the metal cage, and this is what causes the metal cage to rotate. Much more information about electromagnetism and its applications is available in the other videos on this channel.

53 Replies to “Induction Motors – Why and how an induction motor works”

  1. In case, you have not already seen them, I also uploaded several other videos recently.  As always, for each video that you like, you can help more people find it in their YouTube search engine by clicking the like button, and writing a comment. Lots more videos are coming very soon.   Thanks.

  2. Once again, awesome video, i have one question, what is the song that is playing in the background. Its mesmerizing.

  3. cool animation and easy to understand … i'd like to ask have you ever thought about making chemistry videos or making another Channel form chemistry ? i love all kinds of Science but im more into chemistry

  4. I don't understand the first premise.  Why is it that electrons moving in the same direction should attract each other?

  5. Nice one. But, Eugene, you could make two arrows of motion on both sides of a circle. And do the same with the flow of charged particles, instead of making a lot of them. It makes too hard to trace all these moving parts.

  6. The best explanation/animation i've found on the entire internet. When i've watched your video about electromagnetism for the first time i was like "Wow, less than a hour and i understood something that i was trying for months!" Haha. Great video! Keep them coming! 🙂
    (Bad english maybe, sorry)

  7. Hi Eugene.  I am an electronics-teacher and I'm always having a real hard time trying to get students to visualize (moving) interacting magnetic and electric fields in motors and generators.  Your videos are really a huge (and artistically) visual help to this end. So, thank you for making this material so much more accessible and easier to understand.  Your channel is certainly one of the gems of YouTube!

  8. Hai eugene can you do more about electronics 🙂 Thanks for video and i find you having been uploading videos frequntly thanks for that

  9. I do not like the false implication that the forces which drive the Universe are a mixture of good and evil. It is totally wrong. God our Heavenly Father is the source of light and truth. You take too much artistic license which leaves your video your beliefs and therefore your message unable to be accepted at face value.

  10. I am greatly enjoying this playlist. To the point narration, brilliant visuals, and the musical accompaniment is exactly what I would would have playing regardless 😀 TY

  11. Thanks for these. I love how you orchestrated these and introduced me to new concepts and things that I did not fully understood. I appreciate how I can look into world through your videos.

  12. AMAZING ! Thanks so much , you inspire me to study harder…. although I kept getting a bit distracted by the "sexy polygons" but that also made me laugh (:
    Such great imagination in your presentations , they are really a big help.
    No need to reply ! More videos, please (:

  13. Hey firstly thanks for the great video. Anyways I was just wondering, what's the name of the musical piece starting at 2:13?

  14. HMMM, Something about that chick with the horns attracts me. After watching these videos, I know there would be opposition in the relationship and it would end badly.

  15. I love to know the basic of electronic circuits and it's animated videos pls provide us videos of FM & AM transmitter and receiver circuits and it's working in animated videos in detail

  16. i am a higher secondary student..and i always follow your youtube videos as they are very useful for me to visual and thus strengthen my concepts…thank you for this great initiative of yours to set up such a channel in youtube…i must also aknowlegde your level of understanding of the subject you make videos of…they are of tremendous help to me…i would request you to make videos on the circuit theorems like the star delta transformation and t pi networks because i personally feel that your help to make me visualize those theorems would boost up my understanding of electricity:')..i would also wish you tons of lucks for the success of your youtube channel…i literally am honoured to write you this message..thank you…

  17. You can help translate this video by adding subtitles in other languages. To add a translation, click on the following link:

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  18. Your videos are the best i have ever seen. Great animation, ideas and music. Altogether forming very understandable educational videos that make me feel magical about electroengineering 🙂
    Could you also make a video about single phase induction motor without capacitor? I cannot understand it clearly from other channels, but I am sure your animations would make it easy. Thank you, keep up good work!

  19. I was loooking for this type of unification only, though i have limited RAM of my brain i cannot visualize with all data on the spot, but the video helped me a lot

  20. To see subtitles in other languages: Click on the gear symbol under the video, then click on "subtitles." Then select the language (You may need to scroll up and down to see all the languages available).
    –To change subtitle appearance: Scroll to the top of the language selection window and click "options." In the options window you can, for example, choose a different font color and background color, and set the "background opacity" to 100% to help make the subtitles more readable.
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  21. Three coils of wire. Metal cage placed within rotates
    Electromagneticiam – particles w the same charge moving in the same direction exerts an attractive magnetic force on each other
    W same charge in opposite direction exerts repulsive magnetic force on each other
    All moving charged particles create magnetic fields

  22. Whenever we try to change a magnetic field it will create an electrical field which will try to move the particle in a way that will cancel out the change

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