Tutorial and Experiments on Magnetic Levitation

MagnetLev

In this episode Shahriar demonstrates one of the simplest magnetic levitation circuits. First, the basic concept of magnetic levitation is examined. Two different methods of detecting the location of the levitating object is presented and the Hall effect sensor method is chosen. A semi-digital overall system is implemented where a PWM control IC is employed to control the magnetic field strength. The block diagram and functionality of this IC is presented. Finally, the schematic of a dual-Hall effect sensor solution is presented. The circuit is built and tested in both open-loop and close-loop configuration. Magnetic levitation is demonstrated with the capability of adjusting the levitation location. The schematic of circuit can be downloaded here and the electromagnet can be purchased from here.

 

20 comments

  1. RAWAZ says:

    Dear Shahriar;

    I appreciate your acknowledgments and these are helpful really,could you guide me more about the controller which you have designed,I am going to using PID controller for such a solenoid type maglev using FPGA,I appreciate your advices.

  2. Abhiram says:

    Its really a great video & cool project. I’m having some doubts regarding this. Can I levitate objects with around 250g. And can we take this still further by variable loads, even with the variable loads can we bring back the object to the same specified position?
    Please in your leisure help me with your valuable suggestions.

    thank you
    with regards
    Abhiram

  3. omid says:

    Dear Shahriar

    I am really proud that an Iranian engineer propagates these videos with this level of knowledge.
    Actually I’m doing mechatronics at University of Adelaide and we are working on a project which needs to levitate small particles.
    Our particles are made of Nickle oxide and AL2O3(Alumina) with dimension of around 2mm diameter(sphere-like) and they can be attracted by magnets. It is objective to levitate them but we are not sure that it is possible to detect their position with Hall sensors because particles are not permanent magnets.
    On the other hand, we are not sure that we can measure the place of such a small object with optical sensors.

    Could you please give me an idea how I can implement it?

    At the end, thank you for uploading such a detailed demonstration of magnetic levitation system

    Omid

  4. mark says:

    What if the material floating is a non magnetic material? Is the diagram still useful?
    Thank!!!!

  5. Sam says:

    Hi,
    I really enjoy your videos. I built your magnetic levitation circuit and also found it to work but the length of time for the magnets to stay in levitation was very dependent on my ability to place the magnets without inducing oscillations or rotations. I started with four disc shaped magnets but then found that by placing one of the magnets on the desktop directly under the pole of the electromagnet (in opposite polarity to the remaining three magnets) that the repulsion from the desktop magnet provided just enough force to allow much longer levitation times. I find that while in levitation that the total current draw from my power supply at 10 vdc is 350 to 390 ma. I’m interested in hearing about any refinements you might have to your original design.
    Sam

  6. amol says:

    rply me its urgent

    hey friend i really like your project. but in the last you didn’t mention the type an number of diode and electrolytic capacitor. please tell me i need ….. ITS URGENT

  7. Pablo says:

    Hi. Really cool approach! I am planning to build this with a friend, but we were curious on how we could make it even more stable. Would you insert a lead compensator or something?

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  10. Gerard says:

    Any further info on orientation of the sensors and polarity of the magnet?

    Also, I second the comment on more info on improving the design.

    Thanks!

  11. Norse says:

    Thank you for the great video. I built this and found the circuit came together quite nicely with some minor tweaks. Any suggestions for where I can find info about how to improve the design as you were suggesting at the end of your video?

    Cheers!

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  13. sarma says:

    hi
    basically congrats for such nice experiment. having worked with electromagnets for 40 years in telecom,
    i really enjoy your project. i had a basic doubt. please try to indicate the orientation of the upper and lower hall sensors. I hope both the legend facing upwards(means top one would see the back of sensor)

    can you clarify at your leisure please.
    thanks and i admire once again the brain behind the project.

    all the best
    regards
    sarma

  14. Gerard says:

    Your videos are great! Thank you so much for taking the time to make them, I’ve learned a great deal through watching; I only wish there were more!

    Btw, It looks like there is a typo on the schematic for the PWM IC, KA7599 should be KA7500 like the data sheet in the video shows.

    Keep up the great work!

  15. Yue Fan says:

    Hi Shahriar,

    Where did you obtain the KA7599? I have only been able to find the 17599 from Maxim which has extra features.

    We are putting one together for Bring Your Kids To Work Day and think they will find it really exciting… will definitely recommend your blog in the handouts!

    Thank you!
    -Yue

  16. Eric says:

    Hi, I built this setup almost exactly the same. I have the same electromagnet and circuit components. The circuit components appear to be working as expected, but so far I haven’t been able to get it to levitate. It is acting unstable no matter where I put the magnet. It tries to levitate, kicking the magnet on and off. You can feel it, it is just never getting into the duty-cycle zone.

    I am wondering if you had to try different power levels? Also, how sensitive is the setup to different magnets as my magnets are not exactly the same? I am not sure if I need different magnets, but they are very similar, perhaps a little smaller in diameter.

    P.S. I have had some success by removing R2 and R8 (in the pdf schematic) although it is a bit unstable.

  17. Jovian says:

    Shahriar, all your videos are great, I particularly enjoy them because you go into a lot of detail that other “bloggers” don’t. You also cover some interesting topics that I would never have thought about before. I cannot wait for the PLL video, should prove to be very interesting.

    Keep up the good work!

    Regards,
    Jovian.

  18. Dan says:

    Great video, I’m definitely going to do this experiment with my son… I’m buying a new set of screwdrivers, I notice you have a nice set… where did you get them? And I like how you have them organized. Thanks Dan

  19. AA says:

    Awesome video!
    I am wondering why you connected the Vfb and the reference voltage from the potentiometer to both inputs of the IC? Is that necessary for correct operation?

  20. Will says:

    Great video! A very interesting and cool topic that I hope to experiment with when I get some free time. I’m looking forward to a future PLL video as well.

    -Will

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