Not sure that 'floating' is an accurate description since the magnet would be resting on the glass and (hopefully) sliding from end to end as you power the coil.Impossible to say how much current/voltage the coil will require, partly because the magnetic flux needed to move the magnet is unknown and partly because you can trade off current versus number of turns to produce that flux - the voltage requirements would then be determined by the required current and the resistance of the required number of turns. However, the wire you're mentioning sounds far too thick unless you are planning a coil to take massive current. You would probably be much better off designing it for a few thousand turns of much finer wire, but how many turns, how much current is needed with those turns, and how thick the wire needs to be to support that much current, you will need to find by trial and error.
for a 1 foot tube 2 inches wide, with a strong magnet from magnetic key box you'd stick under your car
Not sure if it will work. If you power the solenoid it will suck the magnet in to the middle if you power it the other way, it will try to turn the magnet, not really pushing it to an end.
Quote from: liudr on Feb 01, 2013, 08:58 pmNot sure if it will work. If you power the solenoid it will suck the magnet in to the middle if you power it the other way, it will try to turn the magnet, not really pushing it to an end.I don't think so. When the coil polarity reverses the force will reverse as the magnet poles are still in the same position. The round tube will not allow the magnet to rotate to reverse its poles. Think about why swolenoids work. If the magnet and coil poles are opposite the thing will fly to the closest end as that will be the dominant attracting force and the closer it gets the stronger the force.\The end breaking problem by the magnet when hit can be solved by using a small magnet covered in 2 layers of soft material on both flat sides. The feedback signal for the control loop I'm still thinking on that one...
This is just brainstorming.
a strong magnet from magnetic key box you'd stick under your car
Ok, very good. Please explain more about the resistance of the required number of turns in the coil. I don't quite understand that. How would you know. Isn't it dangerous to send electricity across a bare copper wire?