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Author Topic: Smudge's Musings ** Spin injection transformer  (Read 2694 times)

Offline ramset

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Smudge's Musings ** Spin injection transformer
« on: November 12, 2016, 07:16:28 PM »
Here are some Musings and comments From member Smudge[Cyril]
All comments welcome and appreciated


Here is another OU possibility using spin injection as the primary input to a transformer.[NOTE :referencing PDF below SPIN INJECTION MAGNETIZATION} 
Essentially the transformer core has to be electrically conductive (e.g. silicon steel) and has a current of electrons injected at one point and taken away at a point diametrically opposite.   External to the contact points the electrons are given spin polarization from PM's in auxiliary magnetic circuits.  The contact areas are small enough that the magnets do not saturate the main transformer core there, but large enough to allow some spin polarization to exist there.  The drive current injects more spins on one side while removing them on the other side, hence injecting a magnetizing signal into the core, and being AC results in alternating magnetization acting like a primary drive signal.  Any practical device would have to be an array of tiny cores somewhat on the lines of the old core stores in early computers.


Quote [NOTE : working on posting Vid here }
I have a video by Graham Gunderson where he experimented with a spin injection transformer.  Unfortunately his current was injected over a significant length of the transformer core which resulted in the presence of the magnets saturating that part of the core.  However it did show that signals could be got from spin injection, although it also showed spurious signals when the magnets were not there.  That may have been due to inherent magnetization.  The video is wmv format and over 40Mb so can't post it here.


Here's a variation that obtains spin enhancement. [NOTE : referencing IMAGE BELOW} The image shows a toroidal core in cross section with a single turn input.  There is a two turn output, one of the turns being primarily a piece of Fe wire.  This wire is magnetized by having a PM at each end.  The second turn of copper wire, as well as passing through the transformer core, also winds around the Fe wire in bucking coils configuration.  The load current flowing through these bucking coils adds to the Fe wire magnetization at one end and subtracts at the other end, thus creating a magnetic gradient along the wire.  The spin polarized electrons in the Fe wire then gain an additional pull, the output voltage increases slightly.  We are talking only microvolts increase here, tens of microvolts at the most, so this might only be useful at small voltage levels and high current.  But a transformer that increases its output voltage as you increase the load current could be interesting.

End Quote

All comments welcome

Chet K

also to note we are working on the mentioned video and posting it here too