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

[gravityblock]

Do not drop, bang, hit, squeeze your Metglass cores.  This could degrade the performance and possibly ruin the core.  Don't fasten the coils down.  The coils in the Steorn Demos are inside a plastic case that holds the coil without them being able to move so that no stress is put on them.

Do not wind the wire on your metglass cores too tight and don't squeeze the core to hard when winding.  The pressure of the wire can degrade the metglass.

Handle it as if it was extremely fragile, even if it does have a plastic protective case around it.

GB

[teslaalset]

Ok now lets modify a bit my understanding of ORBO's interaction:

1) We assumed that at TDC the core is saturated just by magnets or requires very little current to saturate. The current is minimal.
2) As we move further with the magnet we only slightly need to rise the current to keep the saturation of the core (as the flux density "coming" from the magnets drops with the distance to toroid).
3) point 1 and 2 simply explains the "exponential lag" of current versus voltage on Sean's osciloscope during the demo show.
3) Since we keep the core saturated the Inductance does not change (flux density is kept constant so permeability stays constant)
4) There is no interaction with the magnet (no Lenz effect) due to core saturation
5) At the proper moment we colapse the field and result in postion where the flux density "coming" from the magnet is minimal, thus the permeability of metglas is maximum (not exactly but close to that) and so the Inductance has risen. Colapsing the field with higher Inductance than at TDC results in electrical energy gain.
6) The higher the RPM the smaller the time frame where you apply energy (current) to keep the core saturated. Thus the higher the RPM, the closer to ratio 1/1 when considering energy input vs energy output.
7) Utilize free kinetic energy of the motor using additional generator
Use the COP > 1 you got to charge your phone ;]

A very nice summary to which I mostly agree as well.
But how to harvest the gained energy?
Looking to point 5, when switching off the toroid coil current, that current is re-directed to the source battery with a fly-back diode I presume.
The current will die out applying the LR constant (R being the resistance of the coil). The integral of this current curve is suppose to be larger than the total current put into the coil on forehand.

Strange thing is that I remembered Sean mentioning the Orbo has some generator coils on the same axis that are used to harvest the energy surplus.

So, where am i wrong here?

[Airstriker]

The integral of this current curve is suppose to be larger than the total current put into the coil on forehand.

Not larger but close to ratio 1/1. It can be less - no problem with that as you use additional generator coils on the upper disc to go to COP > 1.

[PaulLowrance]

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.

[callanan]

Hi jimboot,

My motor is running well on D cell with gen coils and lasts a long time but not OU yet. My ferrite cores just aren't going to cut it so it seems like the consensus at the moment is to go for metglas cores so that is probably the way to go.

Using a small screwdriver you can test for which side of the Jaycar vain switch has the magnet in it. You can also get the small UGN503 hall sensor from Jaycar which is cheaper. This also works well but you will need a seperate 6V battery pack and I have found that it can directly switch the gate of a mosfet well enough on it's own for this motor.

Regard,

Ossie