Steering Magnetic Fields, Saturated Cores

[teslaalset]

Eiger,
Can you post the FEMM model here, please?
I like to have a look at this.

[elgersmad]

Eiger,
Can you post the FEMM model here, please?
I like to have a look at this.

Not at present.  It would take me awhile to produce a FEMM model, and it's far easier for me to just order a core and build one.  In the time consuming sense, it would take me less time to build an oscillator, measure inductances etc and just build a homebrew sine wave oscillator.  Digging around for details and making sure that the software properly models a given material such as Ferrite isn't really easy, and saturation must be taken into account.  More current will always result in more magnetic lines, and saturation doesn't stop that.  So, FEMM won't really show you time resolved events for AC currents.  You would have to fiddle with the software step by step and then produce a list of images to model an actual device.  Most models, are fudged somewhat.  They really just give you an idea.  A complete model includes a list of details that the machine doesn't take into account.  There are no special colors assigned for in saturation vs out of saturation.  Weather maps have snow colors and rain colors, that doesn't happen FEMM it's free.  Free doesn't mean that it can't do that, it just means it takes more tweaking than it's worth.

[elgersmad]

Update, I did some research and found that when a transformer core saturates, it typically fails.  No-one is really looking into controlling saturation or using magnetic saturation.  These kinds of situations are often called faults because, the whole system is literally designed around using the available permeability of the core materials for power conversion.  They are not being used to steer magnetic fields.  There are examples of steering magnetic fields and even at Los Alamos, they have magnetic assemblies that focus up to 14 Tesla into a tiny space.  Nobody is looking at steering magnetic fields as a means of generating power.  But, that would mean using a core that was pre-saturated and most likely by permanent magnets.

So, I ordered two of these cores:
http://www.surplussales.com/inductors/FerPotC/pdf/ich-e50-15-3c90-g2160m.pdf
http://www.surplussales.com/inductors/FerPotC/FerPotC-2.html#eecore

And five of these magnets:
http://www.kjmagnetics.com/proddetail.asp?prod=BZ084

With the North Pole applied to two halves of the E core on the bobbin and the South Pole applied to the opposite side, the core should be driven into saturation.  The center post almost does not matter, but it will be in saturation.  Which direction for the length of the post is anybodies guess.  The inductance of a coil should retain only the air core value of whatever number of turns.  In that sense, I would expect that I could get the north pole or the south pole of the permanent magnets to flow through the center post with just a steering current.  The total number of magnetic lines that will move will be or should be from saturation in one direction to saturation in the other.  So, to reduce the current of the steering current a high number turns may be ideal over a low number.  Here, I would expect that Ampere turns will do more than inductance values.

Winding a coil, isn't a problem for me.  But, not breaking the ferrite when I place the permanent magnets already has me thinking about what to do.  First the corner of one magnet, then slide it up into position.  Then the other magnet.  But, you know, if that magnet slams into that core, it's breaking.

[theifofthings]

Hello! Can you at least draw the specifics about this set up? Because I couldn't really picture out the whole thing with the bulb and the switch