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

[gravityblock]

The problem appears when the coil is powered.
"we saturate the core" or "the core is fully saturated" is no sens if you don't say in which direction. When you saturate a ferrite in a direction, it remains not saturated in a perpendicular direction, and partially saturated elsewhere.

This is only true in an increasing current when the flux is not fully engaged inside the core.  At a steady current, the core is saturated equally through out and not partially saturated elsewhere. 

This is another reason for the near instant saturation of the core with a 10,000mA battery.  All of the flux is fully engaged inside the core almost instantly to saturate the core equally throughout in near 0 time. 

In the orbo, it doesn't matter which direction the core is saturated in.  If it did, then reversing the polarity of the pulse would reverse the rotation direction.  In this case, it doesn't matter what direction the core is saturated because the dual magnets are like poles and the core is saturated equally throughout and nearly instant.  It also doesn't matter which direction the core is saturated in for the magnet not to see it.  The magnet won't see the core regardless of which direction the core is saturated in.  The core is neutral during the period and is like a piece of plastic with no attraction or repelling forces regardless of the saturation direction.

You conveniently leave out the most important factors in your analysis.


GB

[exnihiloest]

A simple experiment rules out Steorn motor theory.

Put a toroid coil between 2 strong disk magnets of a bit larger diameter than that of the toroid, one magnet having its north pole against the toroid, and the other one, its south pole, toroid and magnets being in parallel planes.
The magnetic field is very uniform inside the core, and perpendicular to the toroid plane.
Check the inductance : almost no change, the core is not saturated from the view point of the coil. It is saturated only transversally.

Now shift the magnets or rotate them 90° in order to cancel the field uniformity inside the toroid. The coil inductance is drastically changed.

It means that core saturation influences the coil inductance only when the saturation is along some parts of the circles along the coil center. This implies that there must be magnet field components along the circles at the coil center in order the coil to feel the change of permeability of its core.
A non uniform saturating field makes the coil no more "magnetically toroidal" because of lack of magnetic symmetry in despite its still geometrical toroid shape: field is not confined in the core, there is magnetic leakage of the coil field and also external fields can induce emf in the coil. It follows that magnet and coil act onto one another via their field and that Lenz's law applies.

When the coil is powered, the U/I pulse remains constant because of emf induced in the coil by the magnet moving away. Emf adds current in the coil that compensates the current from the pulse source that would otherwise decreases due to the inductance that is increasing. As shown by Steorn, the direction of the current pulse does not a matter because in any case Lenz's law applies in order to fight the variation of flux (not its absolute direction).

In conclusion when the magnet moves away, the coil desaturates, its inductance increases but according to Lenz's law, current is added in the coil by the change of flux of the magnet generating emf. The fact that currents from the change of the magnet flux and from coil pulse add is not surprising, it is the consequence of the unusual variation of flux because of the inductance change. Nevertheless it obeys Lenz's law and energy conservation still applies, the added current is drawn from the work of the magnet motion. Steorn motor is a parametric motor which is in the field of conventional technics.

[Larskro]

Hi
One core 46 turns  250mH very good.  4 coils in serie 1000mH

See: Calculator 

http://www.66pacific.com/calculators/toroid_calc.aspx

Come on --- Too much talk and too little work.  ??

Good catch Paul.  You can actually see the core and I only see 1 layer of 37 turns as you suggested.  This is the reason in having a "deep battery" to deliver a fast almost instant current to saturate the extremely high permeable core.

Magnetic viscosity determines how much energy it takes to saturate.  If the domains turn easily, then it takes less energy to saturate a high permeable core than to saturate a low permeable core where the domains don't turn easily.  This is a low voltage and high amp system (relative to each other).  Very little resistance in the entire system.

I think there is enough known information now in order to have a successful replication.  There may be other unknowns, but the answers will probably be in the videos and in what is openly said.  They don't appear to be hiding anything and are giving us many good clues to point us in the right direction.

Good job Paul!


GB

[exnihiloest]

...
4) There is no interaction with the magnet (no Lenz effect) due to core saturation
...

In order the coil to feel the saturation, the saturation must be along the circles at the coil center, at least along some parts of these circles (it is easy to check that a transversal uniform field does not change the inductance of a toroid).

This implies that magnet and coil field directions must share  common sections. Consequently magnet and coil act onto one another and Lenz's law applies.

[Airstriker]

@ Airstriker

I couldn't find the graph for the specific material you were looking for but, I did find one for the Metglas Magnaperm material.

http://www.metglas.com/products/page5_1_6_1_6.htm

WOW !!! This graph is absolutely perfect!
Note, that for flux density from 0 to 0,47 T the graph is almost flat. That's the last piece of the puzzle! Look at the scope shoots from the last Sean's demo. As I've mentioned earlier, the first thing that is happening with the current is a slow exponential rise (thus it look's like the current is lagging a bit versus voltage). That's the 0,57 to 0,47 T range on the graph. But then the current trace gets totally steady on Sean's scope. I wondered.. what a hell ? This didn't meet my explanations at all. But hey! According to the provided graph this is totally ok! Since the permeability doesn't change for flux density range 0 - 0,47 T the current needed to keep the core saturated is constant! That clearly points that the material used must be metglas or something very similar!