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

[Bruce_TPU]

Great catch by Airstriker on the Gauss meter measurements done by Steorn. Hey, I think Steorn is using Bonded or Injection Bonded NdFeB magnets, as they are exactly in the 400mT to 600mT range! Sintered NdFeB magnets are ~ twice that strength.

Bonded NdFeB
http://www.aaamagnet.net/NdFeB_Magnets_Bond_NdFeB_magnet.htm

Injection Bonded NdFeB
http://www.aaamagnet.net/NdFeB_Magnets_Injection_Bonded_NdFeB_Magnet.htm

One huge advantage to Bonded NdFeB magnets is they have no measurable eddy currents!


btw, if Steorn needs a constant current as the magnet passes by, then I can see why they might want to stay away from capacitors because it will oscillate with the toroid inductance. A battery would have considerably less oscillations because the battery is non-linear and wants a constant voltage.

Also, I think captainpecan is correct that we should also test other cores as well. If the inductance measurements was all coils in-series, then they must be using another type of core, but still it must be high permeability core. So it might be a good idea to purchase numerous types of Metglas materials. At least Metglas cores are very inexpensive. I would also recommend the same Metglas material, 2714A, but transversely annealed, which has permeability of 80000.

Hi Paul,

In thinking about whether the four toroids were in series or not, I think that we can deduce that it was one individual toroid that was measured, from what Airstrike figured out.  If their magnets are .5 T to match the toroids, the toroids would only be at .5 T EACH if their saturation was that of the original Magamp square loop that you did a great job in finding.  I believe that if the toroids were in series, then the T of the magnets measured would have been four times less.  I think that is right... Your thoughts?

Cheers,

Bruce

[mondrasek]

The cores are only $2.65 each, and so far it appears to be the best matching core to Steorn's. I would think people would want to be encouraging to buy these Metglas MAGAMP cores, not discouraged, right?

I definitely do not want to discourage anyone from whatever their goal is.  But my goal is not to duplicate Steorn's demo devices.  They have openly stated that they are just that, a demo of a prototype technology.  They may or may not be designed with the capability to ever self-run or even with the maximum rotor torque capability for the cores they used.  My goal would be to design/engineer a system that would maximize the rotor torque per unit electrical input energy based on the data that is available.  One part of that process would be to understand the relationship of the attractive force a PM can feel towards materials of different permeability.  Since permeability is usually referenced as an electromagnetic property, I find that PM attraction relationship information lacking.  So I've asked it several times as well as asked for simple experiments.

Again, I appreciate that the cores you have are yours to do with what you will.  I would not want you to risk damage to them at all.  And I agree that it might be difficult or even dangerous to bring a neo into contact with them.  But that also does not need to happen.  The test could be performed with a weaker magnet, even a refrigerator magnet.  Also, separating the magnet from the core with a nonmagnetic spacer, like a piece of wood could allow for a better "feel" or even a definitive answer to the question of does a PM attract to the Metglas cores more, less, or the same as to steel.

No worries either way.  I am also content to wait and see what Steorn, JLN, and/or TK do next as well.

[gravityblock]

Wow now you really are rewritting books ;] If by applying current you are building magnetic field, then by destroying the field you "build" current ;] What's the difference what core material you use ? Don't try to change physics to understand ORBO ;] You people need some sleep ;]

Look, the metglas core holds onto the flux so strongly that it doesn't want to let it go.  Paul mentioned in an earlier post that he thought he was going to tear his metglas core up trying to get the magnet off.  This is the reason why the metglas core can be saturated almost instantly.  The metglas core loves and wants the flux.  I'm not trying to re-write physics books.  I'm just telling you how I see it.

Have a look at my stats and you will see that I don't sleep, http://www.overunity.com/index.php?action=profile;area=statistics;u=16774


GB

[Airstriker]

Look, the metglas core holds onto the flux so strongly that it doesn't want to let it go.  Paul mentioned in an earlier post that he thought he was going to tear his metglas core up trying to get the magnet off.  This is the reason why the metglas core can be saturated almost instantly.  The metglas core loves and wants the flux.  I'm not trying to re-write physics books.  I'm just telling you how I see it.


GB

Sure but these are completely two different stories. One is about the colapsing field which is catched by the coil and the other one about magnetic interactions between magnet and the core. There is nothing in common. End of story ;]

[Bruce_TPU]

I just ordered Metglas (4) MP2510P4AS.  Identical to the MP1305's but these have an OD of 26.8 mm while the MP1305's had an OD of 13.72.  BUT my cost for the 1" OD was $12.14 USD EACH compared to just over $2.00 fore each of the MP1305's.  They do have a $34.00 USD minimum.  http://www.elnamagnetics.com/contact