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Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
I thought id share my latest work in the area of levitation. What i have done in the past is attractive levitation. Attractive is easy because gravity helps to keep things stable. Repulsive, however is much harder.
I use 4 hall effect sensors in this setup to deduce X, Y, and Z. My levitator is powered by a mega168 running at 14mhz.
Stability is still a bit of a problem in this design but I believe i might be able to improve it by lowering my hall effect array a bit.
Everything runs on 12v, at 5a or so max. I also have a real time computer interface set up so i can see what the levitator is doing while it it running.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
Best levitation device I have seen. Looks good, And i agree, It will be much better without the aluminum. I think it would look better if the coils where on top of the controller, Hidden cable's and all. It would be a cool desktop toy.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
That is amazing The construction is immaculate! And it even works
Any thought of making one that works with eddy currents so you don't need a magnet to make it work? Although from what I understand even levating a small object would take a fairly large amount of circulating power that wouldn't lend itself to desk toy form factors very well.
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
Do the coils get Hot?
Nothing gets more than slightly warm even during continuous operation. I was worried a bit about heating because I am using locked anti-phase drive, but the coils seem to have plenty of inductance to prevent any issues.
Any thought of making one that works with eddy currents so you don't need a magnet to make it work? Although from what I understand even levating a small object would take a fairly large amount of circulating power that wouldn't lend itself to desk toy form factors very well.
I agree that it would take a lot of power to make a design like that work. It seems to be much easier to just levitate magnets.
Registered Member #2023
Joined: Fri Mar 13 2009, 05:53AM
Location:
Posts: 7
Wow, this is genuinely impressive. A while ago I tried to get my (attractive) levitator running using a PIC18F452 @ 4MHz but it became unstable rather quickly.
I'm curious, are you using a phase angle compensation circuit or are you generating the response to the hall effect sensors purely in software (which would be even more impressive)?
Either way, great job. I may have to give mine another go.
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
I have tried lead compensation, but my levitator actually gets less stable if i use it. I am currently using an aluminum disk under the object to dampen any vibrations. It is actually almost stable without the damper but the object has a tendency to fall after 20 seconds or so.
All of the mixing and mapping is done in software on my micro.
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Repulsive Magnetic Levitation
The construction is immaculate! And it even works 
