 new levitating device
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cbfull
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Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
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I know exactly what you mean. Eventually one of us is going to have to e-mail the maker of that circuit for some clearer details.
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Steve Conner
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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
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It's a servo system similar to the levitators that many of you have built. It looks like this guy just discovered a clever way to make it balance upside down, using three sets of everything (Hall sensors, servo amplifiers and coils) to give the required three degrees of freedom to balance an object in mid-air. (Technically there are five degrees of freedom, since the sphere has to be stopped from pitching or rolling to make sure the magnet stays at the bottom. But I guess he got it to be passively stable in two of those.)
I imagine it took a LOT of fiddling with control loops and suchlike to get it stable, since it's a complex multi-input-multi-output dynamic system with the three controllers interacting with each other.
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