Thane Heins Perepiteia.

[aether22]

Toad who hops, I am going to first try the number of windings consistent with your suggestions on your site for generating coils (I think you gave an impedance range actually).
So assuming my layer length is similar to what is shown, can you tell me how many layers I will need?

What I am trying to figure is if I need to delay construction and source bobbins. (initially I had planned on cutting end caps from some plastic or wood but I have figured that is likely to become a mess and be too thick)

Or if there are only a few layers hopefully I can get away without anything other than a bit of tape or glue or just total free style?

[hoptoad]

Toad who hops, I am going to first try the number of windings consistent with your suggestions on your site for generating coils (I think you gave an impedance range actually).

So assuming my layer length is similar to what is shown, can you tell me how many layers I will need?
What I am trying to figure is if I need to delay construction and source bobbins. (initially I had planned on cutting end caps from some plastic or wood but I have figured that is likely to become a mess and be too thick)

Or if there are only a few layers hopefully I can get away without anything other than a bit of tape or glue or just total free style?

@aether22
The pickup coil shown on page 10 on my website consists of 80 turns of .63 mm wire wound onto a 100 mm length x 12 mm O/D sheath.
There are 4 layers, each consisting of 20 turns.

I wound the coils directly onto the cores with a paper layer for insulation.  A stick on paper label in fact. I put a different bolt with a long threaded shank though the sheath and included a large washer on the bolt which abutted one end of the sheath. I made up a wooden masonite "washer" which slipped over the outer sheath diameter, and behind it placed a spacer of larger diameter tubing cut to the remaining length of the sheath (approx 87mm) . I then slipped another washer suited to the bolt in behind that, and screwed a nut up to it to hold the assembly in loose position. The masonite washer also had two slots in them to set the coil wire entry and exit points, and stop the coil from slipping during the first few winds. Once you wind the first layer, the "washers" at each end tighten up into position as the coil takes up the space between them, and subsequent layers are easy to wind.

After I wound the coils, I put a few dobs of super glue on them in various places at each end, then disassembled the jig and then dipped the cores into PVC glue and allowed them to set overnight before use.

The coils have a low DC resistance. < 0.5 ohm. Their impedance is a different matter, because impedance is frequency dependent, and also determined by the core/coil inductance value. Impedance (Inductive reactance) is the product derived from the formula X L = 2 x pi x frequency x inductance. So the Impedance will increase with increasing frequency. (increased rotor speed and/or increased magnets on rotor).

The total impedance of a circuit is the square root of the sum of the squares of the resistance and reactance.

Z = sqrt( (R^2) + (X^2) )

Cheers from The Toad Who Hops...

[aether22]

Excellent, Thanks!

I got a somewhat larger size (20mm) and a smaller one.

Wind a few before bed then, 100 turns is easy!

Addition:

BTW, have you realized that these or even normal laminated cores will not work so well in open flux path devices?
For each 120 degrees of strip at the end near the magnet is induced say 1v.
But since it is an open path the magnetic flux at the other end is far far less and so may only be .1v.
This means there is 1v minus .1v leaving .9v of potential to induce eddy currents.

Insulated wire or nails would work better but obviously if it is a worse material there will be greater hysteresis losses, I am wondering if I have seen nails or anything made with a similar material.

Still it does not concern me for my current application.

I believe the reason this works far better than anything else you have tested is in a large part due to the hole. (both is reducing core and hence core losses but likely improving aetheric characteristics)

BTW, you mentioned on page 4 or so that there was a freaky anomaly with the core but you would mention it later but I could find nothing on it.

[hoptoad]

Excellent, Thanks!

I got a somewhat larger size (20mm) and a smaller one.

Wind a few before bed then, 100 turns is easy!

Addition:

BTW, have you realized that these or even normal laminated cores will not work so well in open flux path devices?
For each 120 degrees of strip at the end near the magnet is induced say 1v.
But since it is an open path the magnetic flux at the other end is far far less and so may only be .1v.
This means there is 1v minus .1v leaving .9v of potential to induce eddy currents.

Insulated wire or nails would work better but obviously if it is a worse material there will be greater hysteresis losses, I am wondering if I have seen nails or anything made with a similar material.

Still it does not concern me for my current application.

I believe the reason this works far better than anything else you have tested is in a large part due to the hole. (both is reducing core and hence core losses but likely improving aetheric characteristics)

BTW, you mentioned on page 4 or so that there was a freaky anomaly with the core but you would mention it later but I could find nothing on it.

@aether
There is no freaky anomaly with the core itself. I was freaked by its great O/P characteristics and I was alluding to its ability to exaggerate the "anomoly" of a non linear counter MMF. And this is an anomoly under current electrical theory, because permanent magnet systems are meant to exhibit linear MMF and counter MMF properties. They certainly do in closed systems, but not in open systems.

You will never rid yourself completely of eddy currents and losses. But by winding the coil as a heel end configuration, the apparent loss you refer to is of little significance. IMHO there is something to be learned by re-reading page 4 from fig 10 onwards, and page 5 from fig 14 onwards very carefully. There are IMHO some very important observations regarding magnetic behavior on those two pages.

[polarbreeze]

...the conclusions I drew from my own experience, is that the configurations I used, raised efficiency by lowering losses at any load, compared to a closed magnetic generating system...

hoptoad, could you please post your efficiency measurements? There's a lot of arm-waving going on about this and it sounds like you have actually made efficiency measurements to that would give us an objective proof the the device is providing efficiency improvements. This would silence the skeptics.