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Magnetic levitation “faking” supercunductivity with permanent magnets
Posted: 27 May 2008 10:16 PM   [ Ignore ]
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“...high speed transportation system ensuring absolutely stable and safe flight of a vehicle in its own magnetic field with ... without a servo control system. ... Amlev is based only on rare-earth permanent magnets and laminated steel cores covered by an aluminum layer.”
“realizes self-regulation by employing non-linearity of saturated steel;
employs eddy currents in the aluminum layer to maintain magnetic flux in saturated steel cores “

http://www.amlevtrans.com/

This system apparently works by attraction forces of permanent magnets to steel rails (as opposed to repulsion forces as in Halbach arrays), using “aluminum screens” with induced “eddy currents” as insulation for the magetic flux within the steel rails. Any opinions from scientists/engeneers here?

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Posted: 28 May 2008 03:11 AM   [ Ignore ]   [ # 1 ]
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You can have magnetic levitation without superconductive materials. Bismuth is well-known for this. You can carefully ‘float’ a powerful magnet between two chunks of the stuff quite easily.

As for inducing magnetism in a steel rail, then repelling from that? Sure. Should work fine. But I question their ability to do so in the manner described. Someone with a smidge more physics should be able to answer?

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1: Extraordinary claims require extraordinary proof. If it does what it says, you should have no problem with this.
2: What proof will you accept that you are wrong? You ask us to change our mind, but we cannot change yours?
3: It is not our responsability to disprove your claims, but rather your responsability to prove them.
4. Personal testamonials are not proof.

What part of ‘meow’ don’t you understand?

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Posted: 28 May 2008 07:33 AM   [ Ignore ]   [ # 2 ]
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Magnetic levitation and the Meissner effect are two different things.

Amlev’s system is sound, and has been around for a few years (e.g. this 2001 paper from the IEEE discusses it). Whether it will ever be a commercial success isn’t something I’d venture an opinion on.

[Edit: The IEEE paper is, of course, by the inventor of amlev, Oleg Tozoni. Duh!]

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