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

[exnihiloest]

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http://www.youtube.com/watch?v=veoRZh0GTkQ

Edit: I see it has been posted... sorry guys!!!

Don't be sorry, I missed it the first time 
This Naudin's check is a very very informative video.

What do we see?

1) there is emf induced almost everywhere but in a particular position
2) at this particular position, emf is nullified or at least is under the measurement accuracy
3) the position at which emf is nullified is not the position of the coils powering the motor (we see they are nearer from the magnet).

What can we deduce?

The change of magnet flux in the coil core causes saturation and permeability change. Thus we have two antagonist phenomenons:
1- the classic one: change of flux in the coil induces emf
2- the parametric one: change of permeability opposes the classic change of flux (because the more the saturation, the less the permeability).

Classic change of flux inducing emf is a linear phenomenon while saturation is not at all linear. When the magnet is very near the coil, change of permeability is the dominant effect. When it is far, permeability change is weak and has not much influence.
It follows that at a particular distance, the two effects balance one another. At that point shown by Naudin, there is no emf.
At a farther distance, permeability doesn't compensate the induced emf, so the effect is almost classical.
At a nearer distance, permeability change over-compensates the induced emf and reverses its direction.
This explains why the current pulse is constant in Steorn motor when the magnet moves away. The current provided by the pulse generator should decreases when the inductance increases nevertheless we see no change: the current resulting from the change of flux because of the permeability change, just adds to the current from the pulse generator against the current from normal emf, in order to fight the flux variation (Lenz's law).
But this added current is still drawn from the kinetic energy of the moving magnet trying to escape. The work provided by the magnet when it is approaching the toroid is the same than the work wasted when it moves away and once again we see it is only the energy from the pulse generator that unbalances the energies and permits the motor to rotate.

Even if we placed the powering coils at the position where there is no emf (in fact where the flux change from the moving magnet is compensated by the permeability change), we would have also to add external energy in the system to unbalanced the works done by the magnet when approaching and wasted when moving away.

[exnihiloest]

I think the JLN CEMF test is just a common mistake!
He is not taking into account the winding around the toroid is the same as a loop of wire.
With two passes it's like two wire loops.
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Hi Lumen,

You are perfectly right, we must always be aware that each winding layer is one loop of wire in the toroid plane (if the winding layer is not reversed at each whole turn around the toroid and with an even number of layers).

Nevertheless in our particular case, I guess this effect is likely negligible because the number of turns is important and the wire resistance is consequently high for a single loop. I concede my remark is not funded on measurement but on long practice in electronics engineering.  I let the not convinced guys check it :-)

[gravityblock]

This proves OU beyond a shadow of a doubt.  There is no B.S. in here.  Pure mathematics.  Please recheck my math.

The current from the pulse has a field strength that is equal to 25% of the field strength of the magnets or around 0.13T.  The combined flux density between the magnets and the pulse is 0.60T relative to the core and I must stress relative here (0.47T + 0.13T = 0.60T flux density).  At 0.60T flux density, the metglas core will be fully saturated and will have close to 0% attraction.  In the permeability vs. flux density chart you will need to draw this line until you reach 0.60T but it appears to be a near linear curve.

Before the pulse at TDC, the core has a flux density of 0.47T from the magnets and is still fully attractive.  The pulse at TDC adds an additional flux density of 0.13T to the core which increases the cores flux density it is holding to 0.60T and this fully saturates the core in a near instant time and the core is no longer attractive.

As the magnets begin to depart from TDC, the core is losing flux density from the magnets and the core is getting more attractive, but this is Ok because the field strength of the magnets are decreasing in strength relative to the core as the magnets depart.  When the core loses a total of 0.13T flux density from the magnets, the core is fully attractive at 0.47T and the pulse is turned off.

The strength of the magnets relative to the core at the end of the pulse is 0.34T and will be fully attracted to the core but it has enough momentum to escape.

So, the end result is you had an attraction force of the magnets to the core at 0.47T during it's approach, and only used 0.13T of energy for the pulse during it's departure and lost 0.34T from the drag of the magnets after the pulse.  This is a net gain of mechanical energy of 0.13T (0.47T gain on the approach minus 0.34T loss for the drag after the pulse equals 0.13T).

0.13T net mechanical gain.  0.13T loss from the pulse.  How long was the pulse on for?  It was on during the time it took the core to lose 0.13T from the passing magnets. It will be unity at it's highest pulse width (0.13t mechanical gain - 0.13T pulse width = 0) 

Obviously higher RPM's means the core will be losing 0.13T flux density from the magnets faster meaning a shorter pulse width and will then be OU.  You need me to throw any more stones at you Striker?

GB

[Airstriker]

Nice "reverse time flow of current" theory lol. I just simply don't have time to answer all your stupid posts and will stop this mess in the thread right now ;]

[exnihiloest]

This proves OU beyond a shadow of a doubt.  There is no B.S. in here.  Pure mathematics. 
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We have to remember that facts can call theory into question but theory doesn't call facts into question.
"Pure mathematics" is well inside a shadow of a doubt. Beyond a shadow of a doubt there is only experimental evidence i.e. a self running device, not a motor powered by a battery.

The current from the pulse has a field strength that is equal to 25% of the field strength of the magnets or around 0.13T.  The combined flux density between the magnets and the pulse is 0.60T relative to the core and I must stress relative here (0.47T + 0.13T = 0.60T flux density).  At 0.60T flux density, the metglas core will be fully saturated and will have close to 0% attraction.

The core is fully saturated along circles inside the toroid. It is not saturated for transversed fields or fields not exactly directed along the toroid.
While magnets cannot increase the magnetic field along the toroid because of saturation, nevertheless they can still be attracted because their not toroidal fields can still rotate the magnetic domains of the toroid core towards their own direction which is different from the saturation direction.

"Pure mathematics" is only an internally coherent reasonning, relative to the axioms of the beginning. When the axioms are wrong such those you took, the conclusion is coherent with wrong hypothesis, thus the result is physically false.