Hacked Gadgets Forum

August 30, 2010

Levitating Rotating Globe

at 9:13 pm. Filed under Complex Hacks, Cool Gadgets, Electronic Hacks


Have a look at this Levitating Rotating Globe that Alexey Sha built. Not content with the standard levitating products out there he decided to step it up a notch.

“There are many globes available today which are levitating and rotating along vertical axis. This one is the world first globe levitating and rotating along TILTED axis. It uses wireless power transmittance and geared motor inside the floating globe. In brief, frequency generator is built around micro controller, a square wave output is directed to MOSFET which drives primary coil (10 turns) of output circuit. Secondary coil forms parallel LC circuit (20 turns and 25 nF) and serves as transmitting antenna. Generator frequency can be manually tuned around resonant value to control speed of rotation.

Receiver coil is a parallel LC circuit (~2.5 nF and ~60 turns of wire). It is connected to rectifier bridge. DC geared motor (made of micro servo, modified for continuous rotation) is powered by inductive resonant coupling. Receiving coil, electrical components, and tilted motor are fixed on the floating base. Their locations are adjusted to maintain center of gravity. The globe’s outer shell is directly attached to the motor shaft.”


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22 Responses to “Levitating Rotating Globe”

  1. furrtek Says:

    Idea stolen and sold in 3, 2, 1…

  2. Muris Says:

    i like it 🙂

  3. Wolf Says:

    Coolest hack I’ve seen all month. I’d love to have one of these on my desk. I’d have added some low power led’s on the globe just to show off the wireless power.

  4. Frank Says:

    Nicely done, definitely an eyecatcher. I’d try and mount an LED or two inside the globe, as bright as it can get considering the limited available power, then use a fine drill on the globe to make a tiny hole for each country’s capital city. Might look neat at night. 🙂

  5. spiralbrain Says:

    Brilliant! and ingenious!

  6. Howard Sewell Says:

    Interesting approach, but too complex. H Sewell

  7. Marcelo Says:

    Hi, could you please tell me where I can by the globe and what gauge are the wires ?

  8. DIY Globe Levitates AND Does Tilted Rotation! Says:

    […] via hackedgadgets […]

  9. Peter Says:

    Fantastic! Now slow the rotation period to 24hrs, put 24hrs worth of ticks on the base and line up your current location with the appropriate hour and you’ve got a world clock!

  10. robin Says:

    and add a “sun” ligtsource that moves up/down to simulate winter/summer…
    (you could make the globe spin around it too but that’d be just showing off and unnecisary for a clock)….

  11. Marcelo Says:

    I actually found the globe online for about 85.00 dollars, but could you be more specific in how to make the coil and material list for it ? Thanks
    I want to make one of this to place on my desk.

  12. Matt Says:

    Hi, I saw your project on the nuts and volts website, it is very very interesting. I had just a few quick questions for you. I was wondering what did you use for the core of each inductor? How did you position the inductors in the transmitting circuit, so that they could be tightly coupled? About how much power does the microservo receive?

    Thanks for your help


  13. Alexey Says:

    2Matt: Inductors don’t have a core, just air. I wrapped copper wire around a cup of appropriate diameter and then removed a ready inductor from a support. You can notice a blue tape I used to hold coils together and to fix them on the base. Receiving coil is fixed under floating magnet, that is why energy transfer efficiency is not high. The transmitted power was in order of few milliwatts, not high but enough to power the motor. The efficacy could be much higher with free (no massive metal around) receiving coil and high Q capacitors used to tune LC circuits to be in resonance. I didn’t spent much time to optimize the circuits, to be exact I sacrificed old computer power supply for parts. The idea behind resonant magnetic coupling is a large Q factor of LC circuits, which I guess in my design is pretty low mainly because of capacitors. The purpose was to make globe rotating on its tilted axis. I was not looking for highly efficient wireless power transfer. Please keep in mind, the number of turns in receiving coil is very approximate, I didn’t take any notes during construction.

  14. Marcelo Says:

    Hi Alexey
    What size (AWG) did you use for the coils?

  15. Globo terráqueo levitando sobre eje inclinado – Video del domingo CXLVII Says:

    […] construido por Alexey Sha, en el video se puede ver un resumen de la construcción, en Hacked Gadgets hay fotografías y diagramas publicados. Simplemente […]

  16. Zhora Says:

    Truly wonderful! It’s amazing how much better it is with tilt, turn and float than any of those that lack 1 or more of them. Thanks.

  17. DORU SANDU Says:

    I am a teacher and the students build a “Rotating Levitating Globe.
    Where can I find complete documentation, kinematics scheme (location of magnets), circuit diagrams, etc. …..?
    I hope not to be totally secret!
    Contact me by email: comraex@yahoo.com
    Help me please!
    Thank you very much.
    Sandu D.

  18. Alan Parekh Says:

    Hi Doru,

    All we have is the crude schematic in the images section.

  19. Brad Says:

    Coolest thing Ever! How much you want for that?

  20. arthur Says:

    i would like to know how big could this tilting globe be built?

  21. Luigi Fulk Says:

    The new Zune browser is surprisingly good, but not as good as the iPod’s. It works well, but isn’t as fast as Safari, and has a clunkier interface. If you occasionally plan on using the web browser that’s not an issue, but if you’re planning to browse the web alot from your PMP then the iPod’s larger screen and better browser may be important.

  22. Leonardo Says:

    i’m excited, wanna do it myself! please alexey can you explain this: the circuit that transmit energy for the motor is separated from the levitation device? do they interfere? thank you!

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