consideration about converting magnetic flux from a magnet to electric current

[gyulasun]

Hi,

I agree this is a nice idea, however I find it rather difficult to solve the problem of heat-cold isolation. At least I wonder how you would solve the heat-up versus the cool-down process, somehow you would have to make means to make it happen and that would need energy.  Have you pondered on this?  Or  you expect energy gained from the cool-down process and with this gained energy you wish to make the heat-up process? 

On youtube there are some videos showing the opposite side of the temperature scale: reaching the Curie temp of either a ferromagnetic core or a permanent magnet, the change in permeability or magnetism cause some effects. (I know you did not mean this of course.)
http://www.youtube.com/watch?v=qLoDqDLsrGs   http://www.youtube.com/watch?v=RWrTvB-oK94 
It seems the magnetic properties change rather slowly at the Curie temperature and the question is that at the other end of the temp scale, at the supraconductor temperatures how quick the changes are,  you know the quicker the fluxchange the higher the induced 'juice'.

rgds, Gyula

[kelloggs]

hi gyulasun

yes, it's an issue to alternate the ambient temperature of our superconductor. it was a general idea that it should be possible to generate energy without "spending" energy (through the natural process of the universe "cooling" itself) but Gwandau mentioned a really good option where we only have to maintain a certain temperature:

quote from wiki

Type-I superconductor
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The interior of a bulk superconductor cannot be penetrated by a weak magnetic field, a phenomenon known as the Meissner effect. When the applied magnetic field becomes too large, superconductivity breaks down

i assume a strong permanent magnet could prevent the superconducting state from even happening but i if we adjust the magnets strength so it is just beneath the superconductor breaking point we only need to use the least amount of energy to produce a magnetic field that tips the superconductor over but in return we get a full flux step that hopefully generates us our ou 'juice'

through the magnetic circuit it's possible to displace our pickup coil so its warmth from the current flow doesnt unnecessarily heat our superconducting material. with a good thermal isolation (a vacuum for example) we should be able to maintain the cryogenic temperatures at a minimum of energy cost.

On youtube there are some videos showing the opposite side of the temperature scale: reaching the Curie temp of either a ferromagnetic core or a permanent magnet, the change in permeability or magnetism cause some effects. (I know you did not mean this of course.)
http://www.youtube.com/watch?v=qLoDqDLsrGs   http://www.youtube.com/watch?v=RWrTvB-oK94 
It seems the magnetic properties change rather slowly at the Curie temperature and the question is that at the other end of the temp scale, at the supraconductor temperatures how quick the changes are,  you know the quicker the fluxchange the higher the induced 'juice'.

rgds, Gyula

well, in my original thread in the german forum i was thinking about that possibility too but i was given the opportunity to think again: what happens if you destroy the magnetic field of your magnet? well, you get the magnetic energy back you put in during the process of creating the magnet but then its gone. you wont get the magnetic field back without putting work in it so i ditched that idea.

[kelloggs]

v2

edit: holy shit, i was looking up some tables which list the Hc values of superconducting materials and i nearly got a shock that there are no materials which can withstand even 1 Tesla but luckily i found this:

http://en.wikipedia.org/wiki/List_of_superconductors

that MgB2 looks most promising as it has the highest Hc value so it can contain a strong permanent magnet

http://en.wikipedia.org/wiki/Magnesium_diboride

edit: okay that was a fail... thats actually the Hc2 value because its a Type II superconductor but i cant find a table where the Hc1 values are listet because between Hc1 and Hc2 magnetic flux can already penetrate the superconductor... only the electric resistance stays zero between these values... great

i hate it that i can't find any table with Hc1 values...

lol, it seems like nobody is caring about that Hc1 value because everyone thinks that zero resistance is more important than deflecting magnetic field lines...