Thane Heins Perepiteia.

[JustMe]

Pictures of the new generator set up and a theory question from Thane:

Here is our new coil test prototype.
And here is a question for all the armchair theorists out there?
The Gold ? high current wire slows the rotor when shorted
and the Gold ? high voltage coil on the same core accelerates the rotor?
Why?

[Mr.Entropy]

As far as I can see, the only requirement would be that by changing the coil connections you can cause the the torque-speed characteristic of the device to go from being a stable one to an unstable one with that particular motor - and there seems to be plenty of opportunity to do that with all the coils and magnets that are in play there, don't you think?

Not on average, no.  The system will accelerate when it is at a speed where load torque < motor torque.  If you apply any kind of break, which is what the load coil is supposed to be, then it increases load torque at various speeds by various degrees -- that's what "break" means.  Since it does not also boost motor torque, this can only reduce the extent and depth of any accelerating speed ranges.  It cannot introduce an accelerating speed range.

The coil is not really just a break, however.  It is on average, but its inductance gives some inertia to the current in it, so its magnetism, once established, will not be cancelled immediately by Lenz's law, and will actually boost the rotor during some parts of the rotation.  If one of these little boosts could nudge the rotor so far into a speed range where it accelerates that it was caught up by the increased motor torque and increased further before the breaking part of the cycle could push it back down into the stable region, then it could initiate a sustained acceleration.  It would then accelerate to the top of the accelerating speed range.

If this were the case, howerver, then disconnecting the coil would increase the extent and depth of the accelerating speed range and cause the rotor to accelerate further instead of slowing down as it does.  Also, this significant boosting is not plausible given reasonable estimates of the rotor inertia, coil inductance, and motor torque curve.  The acceleration effect would also not increase with the number of connected coils, as it appears to do.

[LarryC]

Pictures of the new generator set up and a theory question from Thane:

Here is our new coil test prototype.
And here is a question for all the armchair theorists out thereÃ,…
The Gold Ã,â€" high current wire slows the rotor when shorted
and the Gold Ã,â€" high voltage coil on the same core accelerates the rotor?
Why?

Sorry JustMe, but your two 'Gold' have me confused. I can see the two different coil gauges but not any Gold. What am I missing?

Regards,
Larry

[JustMe]

Sorry JustMe, but your two 'Gold' have me confused. I can see the two different coil gauges but not any Gold. What am I missing?

Regards,
Larry

Dunno. It's a direct quote from Thane via email.  He'll have to clarify.

[JustMe]

Does the rotor slow to a stop, or just slow down and maintain?

Does higher current/lower voltage mean more back emf as opposed to lower current/higher voltage? I apologize because that's probably a really easy one, I just don't know.