STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[PaulLowrance]

This looks like they are using the same toroids for all their demo's.  I see many more than 24 turns here, and judging by how narrow the center hole is, there is quite a few layers also is my guess.  Depending of course on the actual size of that toroid, my guess is they are upwards of 250 turns easily.  Maybe near 500.  This could put them right back down into the ferrite core to mumetal range again easily.

Here's a snap shot of the *actual* toroid in the demo used during the inductance measurements. I counted 3 turns for 45 degrees. Actually, is it closer to 4, which makes it 32 turns? That's close enough for a rough estimate. 

[PaulLowrance]

Now this is getting interesting. I think it's very possible Steorn is using a Metglas 2714A *Longitudinally* annealed core. Consider the two possibilities:

#1
If we take a look at the BH loop of the Metglas 2714A *Longitudinally* annealed core, then it looks like Metglas took the permeability measurements near 100% saturation, but if we consider say 95% saturation then according to that graph the Metglas 2714A *Longitudinally* annealed core permeability is 2.2 million. This would mean the Steorn core had ~ 27 turns instead of my estimated 24.

#2
If Steorn's permeability measurements were near 100% saturation, then my estimated turns for the Steorn core would be 39 turns.


Both cases are believable, and the only options I see.


Either way, the only core that comes even close is the Metglas 2714A *Longitudinally* annealed core. Hey, I have some of those cores.   

[PaulLowrance]

I've always assumed Steorn would camouflage their core, did they? In a close up photo of the core used in the Steorn Talks #2 looks like it's black. Notice how a lot of Metglas core casings are black plastic.

[PaulLowrance]

btw, I just counted all of the turns shown in the captains photo (last photo shown in above post) of the Steorn's coil, and I'm getting 37 turns, which places it at 1.1 million permeability. Maybe there are a few more turns I can't see, but to put it at 1 million would take 39 turns.

Looks like Steorn is using Metglas 2714A *Longitudinally* annealed core, which the only ones available in non-custom order are the Metglas MAGAMP - Square Loop Cores -->.

http://www.metglas.com/products/page5_1_6_4.htm

[mikestocks2006]

This looks like they are using the same toroids for all their demo's.  I see many more than 24 turns here, and judging by how narrow the center hole is, there is quite a few layers also is my guess.  Depending of course on the actual size of that toroid, my guess is they are upwards of 250 turns easily.  Maybe near 500.  This could put them right back down into the ferrite core to mumetal range again easily.

Hmmm...
Orientation of the toroid looks different than the one(s) shown at the latest demo.
Demo's coil(s) look to be horizontal and parallel to the rotor plane of rotation.
Coils may appear the same, but in the pic above the different realtive positioning to the passing rotor magnets may drastically effect coil's response.
If, and that's a big if, this is the orientation on the regular pulse motor, and the Orbo has its coils flat, then we cannot be sure if these two systems can even be compared.
Thanks
Mike