Electromagnets capability of repulsion.
Electromagnets capability of repulsion.
(OP)
I am wondering if anybody can inform me of how to use an electromagnet to repulse a small platform of Aluminium in the air to about 6 inches. NOTE: the platform is 65mm in radius and will have numerous amounts of neodymium magnets spread across the underside facing in same polarity to the electromagnet below. I'm still in confusion whether to place the electromagnet with poles facing vertically or horizontally (although the general theory is vertical). Any help in this matter would be greatly appreciated.





RE: Electromagnets capability of repulsion.
It appears from your comment that your EM is being applied at the point where the flux lines are following their return path.
If I were attempting to do this I would be starting with an EM of near 24 inches square for the field projection.
A bit more description of your device would be helpful.
Mike
RE: Electromagnets capability of repulsion.
Merely applying a repulsive magnetic field is not enough to maintain stable repulsion. The platform/magnet assembly is not going to maintain repulsion on its own. It will try to flip around to attract towards the electromagnet.
What you are asking for is not easy.
RE: Electromagnets capability of repulsion.
http://en.wikipedia.org/wiki/Magnetic_levitation
RE: Electromagnets capability of repulsion.
RE: Electromagnets capability of repulsion.
RE: Electromagnets capability of repulsion.
RE: Electromagnets capability of repulsion.
The use of AC or eddy current force for levitation quicky heats the aluminum plate. The Wikipedia article mentions the levitation of a phone book with a aluminum plate inside. I wonder how long it took before the book started on fire.
Abolysis,
A nine volt bench type power supply or maybe two or three of them is not going to be enough to generate the field you need. The magnet I mentioned earlier as to where I would start is in excess of 1500 watts DC and 30000 ampturns.
Mike
RE: Electromagnets capability of repulsion.
I hope to read the raplies thanks.
RE: Electromagnets capability of repulsion.
=====================================
Eng-tips forums: The best place on the web for engineering discussions.