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Author Topic: Levitation Related Problem  (Read 3714 times)

Offline goofkid

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Levitation Related Problem
« on: 28/05/2005 00:21:58 »
Hi everyone :D! I'm having a problem related to magnetism. I can't seem to get a magnet to levitate between two other magnets [|)].
Click here to see a diagram of my experiment:
http://http://www.geocities.com/cooldanyal/science_ideas.html
Why doesn't it work!?

And recently, I found this clip:
http://http://sci-toys.com/scitoys/scitoys/magnets/pyrolytic_graphite_2/poke.gif

Can somebody tell me what kind of magnet that might be (in the clip)? [?]

Because once I figure all that out, I have othere ideas to go along with it. :)

Goofkid


 

Offline chimera

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Re: Levitation Related Problem
« Reply #1 on: 28/05/2005 10:32:01 »
Some pyrolytic graphite one? :)

also cool:

http://www.hfml.science.ru.nl/froglev.html

The living are the dead on holiday.  -- Maurice de Maeterlinck (1862-1949)
 

Offline daveshorts

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Re: Levitation Related Problem
« Reply #2 on: 28/05/2005 10:41:30 »
Unfortunately someone a while ago (I think he was called Ehrenfest but I may be wrong) worked out that there is no configuration of permenant magnets that is stable basically the problem with your experiment is that if the small magnet moves slightly closer to magnet A, the pull from magnet A gets bigger, and the opposite pull from magnet B gets weaker so it keeps moving towards magnet A - it is a bit like trying to balance 2 balls on top of each other.

It is possible to make it work if on eof the magnts is spining as the gyroscopic effect stops the magnet rotating which is a failiure mode.

The thing you have seen on the web is using a piece of graphite which isn't a magnet it is a diamagnet - these repell magnets so you can actually  make a stable system.
 

Offline Ultima

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Re: Levitation Related Problem
« Reply #3 on: 28/05/2005 13:13:38 »
Get some super conductors that'll sort the problem out :D If only we had some room temperature ones... we could have some cool stuff, like levitating houses.
http://www.fys.uio.no/super/levitation/

Or look at magnetic bearings; you need to work with circles and electromagnets. I seam to remember doing something in a physics experiment using shaded poles and a stepped phase AC supply to levitate/rotate a tin.
http://www.sti.nasa.gov/tto/spinoff1996/62.html


wOw the world spins?
« Last Edit: 28/05/2005 13:15:00 by Ultima »
 

Offline goofkid

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Re: Levitation Related Problem
« Reply #4 on: 28/05/2005 17:50:38 »
quote:
Originally posted by daveshorts

Unfortunately someone a while ago (I think he was called Ehrenfest but I may be wrong) worked out that there is no configuration of permenant magnets that is stable basically the problem with your experiment is that if the small magnet moves slightly closer to magnet A, the pull from magnet A gets bigger, and the opposite pull from magnet B gets weaker so it keeps moving towards magnet A - it is a bit like trying to balance 2 balls on top of each other.

It is possible to make it work if on eof the magnts is spining as the gyroscopic effect stops the magnet rotating which is a failiure mode.

The thing you have seen on the web is using a piece of graphite which isn't a magnet it is a diamagnet - these repell magnets so you can actually  make a stable system.




Oh so what I should be looking for is a diamagnet. It would be alot easier :D.  Thanks.

Goofkid
 

Offline goofkid

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Re: Levitation Related Problem
« Reply #5 on: 28/05/2005 17:54:51 »
Cool Sites Ultima :)! Those are the kind of magnets that I should be looking for ;).

Goofkid
 

Offline DoctorBeaver

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Re: Levitation Related Problem
« Reply #6 on: 28/05/2005 18:01:19 »
The best way to achieve it is to use computer-controlled electromagnets with a detection sensor. If the object you're suspending (Sorry, but I just have a problem with the word "levitating". It reminds me too much of the Natural Law party with their yogic flying) moves in a given direction the computer senses it and adjusts the current to the magnets accordingly. I'm sure that if you paid me untold sums of money I could develop the system for you! heh
 

Offline goofkid

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Re: Levitation Related Problem
« Reply #7 on: 29/05/2005 15:43:30 »
quote:
Originally posted by DoctorBeaver

 If the object you're suspending moves in a given direction the computer senses it and adjusts the current to the magnets accordingly. I'm sure that if you paid me untold sums of money I could develop the system for you! heh




That technology sure sounds awsome [8D].

Goofkid
 

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Re: Levitation Related Problem
« Reply #7 on: 29/05/2005 15:43:30 »

 

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