Wednesday, March 11, 2009

Coil Levitation with Eddy Currents

I tried out a little quickie experiment in the lab this afternoon. In short: a coil with a changing current, (AC), placed on a non-ferromagnetic conductor, like aluminum, will induce an opposing magnetic field and levitate. You can read all about the effect caused by eddy currents, on Wikipedia, and watch what happened in the lab here:





4 comments:

King said...

Hi there,

I have been doing some research into magnetic levitation using eddy currents when I stumbled upon your video here: http://12seconds.tv/channel/dolphus/108842. It is the only video I could find of someone actually doing levitation - which is weird. So I was just wondering if you could answer a few questions about the setup of your experiment. It would be greatly appreciated if you could just tell me the schematics for you experiment:

Was it AC 60Hz 240V power?
Aluminium table you used underneath?
Insulated copper wire in the

King said...

contd...

in the circle?
How many turns of copper wire? (just a guess of how much wire to use?

If you could answer these I would be grateful.

Lance

Hamilton said...

The power was 60Hz 120V regulated through a variac to about 30V. The coil is insulated magnet wire. I don't know, but I suspect there are about 300 turns. It's just an old coil I pulled out of the junk pile. The metal underneath is about 3/4 inch think aluminum.

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