Thane Heins Perepiteia.

[aether22]

Whoever keeps changing the subject of this thread, can you maybe not?

It can make it hard to keep track of it!

BTW I bought some .355mm wire, about 1Kg of it, I was hoping to get about .7kg of 30AWG (which would do the 4875 ft)  but could only get this which will do about 3500ft, hopefully that will be enough although I may be able to add a bit more of various sizes to it maybe, or I might just buy a tad more if it is insufficient for the effect.

Got the optical tach stuff sorted, should be able to put together in a minute or 2 though I am too tired to do it tonight.

And then I just need to wind wire on my 1 inch 'bright' mild steel core, I am hoping I can get a hole cutter drill bit attachment with an ID just larger that my core and glue/tape etc... various parts until reasonably securely attached, otherwise I will try to drill at least some hole into the steel core.

If anyone has better idea I'm all ears, Thane, how did you wind them? by hand?

[OilBarren]

So I am going to have to find some wire that is thinner, am I going to have to fight the temptation to buy stuff even thinner than Thanes to use less?


Thane, why do you use the gauge you do? Would you expect success with a lesser gauge?
Do you only use the gauge you do because it resists breaking?

AETHER22,
WELCOME HOME. I USED 30, 28, 26 GAUGE WIRE.

LATEST TRANSFORMER TESTS

I HAVE UPLOADED SOME OF OUR LATEST TRANSFORMER TEST PHOTO-DATA HERE:
http://www.megaupload.com/?d=ERZR4652 - ALSO JM SHOULD BE POSTING THE PHOTOS SOON AS WELL.

IT IS INTERESTING TO NOTE HOW THE PRIMARY IS VIRTUALLY NON RESPONSIVE FROM 1 M ohms RIGHT DOWN TO ABOUT 20 ohms. IT IS DIFFICULT TO SEE BUT THE VOLTAGE ACROSS THE LOAD REMAINS STABLE AT AROUND 2.9 VOLTS THROUGHOUT AS WELL.

A CONVENTIONAL TRANSFORMER RESPONSE CAN BE SEEN HERE:
http://hyperphysics.phy-astr.gsu.edu/Hbase/magnetic/tracir.html#c3

LUC WILL BE ADJUSTING THE SECONDARY TURNS # TODAY TO INCREASE THE VOLTAGE ACROSS THE LOAD - TO SEE WHAT HAPPENS IN THAT CASE.

Thane

[aether22]

Thane, I have roughly 27 Gauge, about 1Kg of it, that's about 3500 ft and about 180 ohms.

Where as if I assume your 200 ohm coil was 26AWG you had 1.73KG of wire, 4,875 ft.

Basically mine has 28% less length.  On the plus side, I should have slightly more than 72% as many turns because as it is slimmer it won't increase the core diameter quite as fast.

Would you expect that to be enough to demo the effect with a single coil? (Give odds if not sure)

Again if you could drop a line or 2 on how you wound your coils, by hand? or with some motorized setup? (winding by hand tends to twist and break wire)


BTW should it prove useful to anyone here are ways to increase the power of the effect:

Number of magnet poles on rotor
RPM
Number of turns
More coils?
Stator closer to rotor poles (it should increase effect as flux and induction should increase)
Better core and coil form (assuming hoptoads observations are relevant)
Shorter more direct path to motor

[JustMe]

.

[hoptoad]

It is a semi closed system with metal cups. This has always intrigued me. Do you have ideas on how that dynamic would play out? It seems that N-S would fight until the opposite face loses.

@LarryC
Interesting questions and possibilities.    The cupped magnet/s would likely induce a complex sinusoidal flux change as it/they move past past the coil core, and not a classical simple sine wave as you would expect. At the core - magnet register point, the magnetic field in the core might even "appear" to momentarily "disappear", as the magnetic field induced into the core face would be radially split by the bloch wall which is formed near the circumference of the magnet face by the metal cup that surrounds it. IMHO, there would be a degree of simultaneous N/S vector opposition influencing the coils which would be counterproductive to efficient electrical generation. But I acknowledge that I do not know for sure.   

My question is would that be a slow flux loss based on face percentage or an extended battle causing a quick flux release at certain coil charge value? In case you missed this fact in all the clutter, the core/magnet gap is much larger then in a convention motor/generator.

I cannot honestly say it is one or the other.    Both conditions may be arising at different stages in the magnet - core transition period.
I wish I did know, but I've never experimented with a semi closed system as presented by cupped magnets. Hopefully Entropy or some one else may offer some insight.

P.S. Yes I am aware of the greater air gap, and in fact I have covered this subject on page 5 of my website as it relates to open magnetic sytems.

Yes, that's true -- I have recently observed it in some experiments, and I'm quite surprised that you know it!

I'm surpised I know it too !   

It has been my experience so far, however, that the phase change in the counter MMF is only made possible by this potential leakage (more precisely, it appears that magnetization diffuses into ferromagnetic materials), and that this phase change can mitigate the energy loss, but not entirely cancel it.

Agreed, though you can reduce the loss by such a degree, that what remains is acceptable.

Yes, I have observed this as well, although not the requirement for "low impedance coils".

Low impedance coils are not a specific requirement. I was indicating that higher rpm speeds are required for the effect to kick in with low impedance coils. And moreover, that the effect will occur, even in low impedance coils. There is however, as with all things, an optimum range of impedance for which this effect will be useful. If the coil impedance is too high, coil current will be so restricted (choked), even at short circuit, and the effect will not neccessarily manifest, as counter mmf phase transitions are dependent on the coil current. A coil with 40,000 turns will have a huge impedance and is unlikely to yield a practical power output or benefit greatly from any counter mmf phase changes. It will produce very high voltage, but not a lot of current.

However, it has again been my experience that these open systems have extra losses that make this possible, and the power out is never enough to make up for the braking effect that remains.

It was initially my experience too, until I started experimenting with hollow cores (solenoids), with the coils wound "heel end" style on the the cores.

This is all consistent with what I said about how Thane gets his acceleration.

Yep, pretty much 

Cheers all from the Toad who Hops ...... KneeDeep