Graham Gunderson's Energy conference presentation Most impressive and mysterious

[MileHigh]

TK:

Google II from the Power Guru!

http://www.powerguru.org/maxflux-%E2%80%93-magnetically-biased-inductor/

MaxFlux – Magnetically Biased Inductor

Utilising the core to its fullest!

In modern topologies the inductive components require most of the space and contribute significantly to the total weight and system costs. Therefore the biggest potential for achieving a compact and cost efficient system lies in the optimization of these devices. Most of the effort made in the last years was focused on the thermal management and using better soft-magnetic materials in order to reduce the volume.

By Stefan Herzog, Alexander Stadler and Christof Gulden, STS Spezial-Transformatoren Stockach GmbH & Co. KG, Stockach, Germany

However, for a specific class of inductors there is a further opportunity for optimization. In topologies such as buck or boost and PFC SMPS the inductors are usually used in a unipolar way, i.e. the current flows only in one direction of the coil. In these chokes only half of the theoretically maximum swing of the flux density is realized. This article deals with the technique of biasing the core with a permanent magnet in order to reach the full swing. The result is a choke which is smaller, lighter and more economical compared to existing constructions.
Working principle

Biasing the soft-magnetic core with a permanent magnet is a principle which has been investigated for a long time [1, 2, 3]. Even more recent work deals with this tempting technology [4, 5, 6] . However, up to now no commercially available solution is known, where the biasing method is used in serial production.

The biasing technique concerns unipolar applications, for example storage or PFC inductors. The typical current characteristic of the first class is shown in figure 1.

[DreamThinkBuild]

Hi Spokane1,

Thank you for that information. The loop design changes the field going through just the ends of the central core. It doesn't make sense to me in that configuration because any change in the drive coil is fighting against the loop. Instead of switching, if the polarity were all equal, it would be halved through the output. I don't really understand that configuration enough without doing some small tests.

The tuning/spacing sounds like it took years. Maybe each magnet assembly could be mounted to non-magnetic linear bearings, nylon rods, worm gear and driven by a stepper motor. Have a micro-controller move the magnet assemblies while sweeping the input waveform through the drive coil and monitoring the output. Eventually it may hit a sweet spot, but if you need a robot to tune it I don't know how practical it would be if another magnetic field in the area can throw it off.

Hi Tinman,

I've tried solar panels(both poly and mono crystalline) with different magnet arrangements on/near/around them (moving, spinning and non-moving) and didn't measure any benefit. Laser diodes though will activate solar cells.

[Spokane1]

Dear DreamThinkBuild,

Here is a recent photo from last Monday of Graham's machine with the PM clamps removed. The PM's that are remaining are self supported.
I suppose that you can determine the likely polarity from this arrangement. In this test he wasn't using any spacers.

Keep up the good work on the simulations. I wonder what is happening in the main core.

Mark McKay

[ramset]

@ All
Below are more thoughts on Graham's device from member Smudge

@ Note to Spokane 1
At this forum if the posted pictures are too big [bigger than 1200x1000 [I think??}}we have to run across the page to read it.

respectfully
Chet K

[gyulasun]

....
Let's Google!
....

Well if you do a search inside this forum...

This coil type with the added ceramic magnet to fine tune coil inductance was discussed here,
see this link for instance
http://overunity.com/3500/nathan-stubblefield-earth-batteryself-generating-induction-coil-replications/msg199535/topicseen/#msg199535

The bottom line is that as Spokane1 wrote above, if the output power of this device depends
strongly on exact tuning then the use of permanent magnet(s) on the ferromagnetic core
to fine tune the LC tank is a convenient means to achieve exact resonance condition.

There is another consideration, however, and that is said by some people:
you can influence the electrons spin in the core by an applied outside magnetic field and
together with simultaneous other excitation of the core the overall effect may result in some extra output.

The problem is that if you remove the biasing magnets, you need to find means to retune
the coil to the same inductance it had with the presence of the magnets, to be able to tell
whether the influenced electrons spin yield any output or not.
So very careful adjustments and measurements have to be applied.

Gyula