Permanent magnet flux gate - SSG idea

[gyulasun]

Unfortunately the better simulators are very expensive, over in the $15-20k, unfortunately.  Look for Infolytica (http://www.infolytica.com/ ) or Maxwell 3D ( http://www.ansoft.com/products/em/maxwell/ ) Of course there are other products too.  Perhaps asking for info at a local university campus EE department would also be of help?

[gyulasun]

Thanks for the feedback!

I'll take a thorough look at that thread and patent drawings before delving much further into it.  I don't want to repeat past work if its a known failure.

The program I'm using doesn't allow me to specify anything for the cores other than permeability, so its pretty limited in that respect.  I also wasnt sure about neo magnet strength, I'll run the sims again with a strength of 1.25 (you said 1.5 ~ N52 neo, I have N48's around here).  I'm not sure what to use for the flux path materials, i was thinking of the stuff Bruce_TPU (Flux bars) was molding in another thread.

The Bulgarian MEG is reported to be a COP>1, about a COP of 2.  Member  Getca in the thread I referred to you above also reported COP>1. 

For the flux path ferrite is a good choice but it is very difficult to machine if it is needed, and often you are limited to off the shelf sizes. Yes the method Bruce showed is also viable. Just think of eddy current minimization that is the most important here in this setup.

[teslaalset]

Hrm - perhaps you could recommend another flux modeling software?  Here are the results from changing the neo to 1.25 teslas and the current to 1uA.  Hard to swallow that so little current could block the flux.  So if you can recommend a different software package, that'd be great.

I use FEMM for this, although it is only able to simulate in semi 3D (depth of the 2D is adjustable before calculation).

FEMM can be found here:
http://www.femm.info/wiki/HomePage

It's free of change.

What program did you use for your initial simulation as posted here?

[NTesla]

The past few days I have been thinking about a similar concept! Essentially an Ecklin generator that uses toroids as flux switches instead of the mechanical 'flux blocker' i.e a solid state Ecklin generator (which in many ways is like the M.E.G).

You would pulse the torroid to create the equivalent of an air gap between each pole of the magnet and the iron core. The toroid would be wrapped with copper wire AROUND the contact surfaces of the magnet and iron core (like your pictures shown) so that the magnet and iron core would be in contact with the material of the torroid.

I was thinking of testing the concept using a C core (2 toroids only), mounting the torroids horizontally (instead of vertically like your pictures show to reduce undesireable flux paths) and then if I could generate reasonable current in the coil, then making an I core with 4 toroids (one per pole of the 2 x N/S magnets, preferably in a horseshoe configuration (rare for Neodymiums)).