Thane Heins Perepiteia.

[Heinstein]

"Thane, if you halved the resistance in the secondary circuit in your tests when you were getting (I think it was) 170v across your load, did the voltage across your load drop?"

When you say "halved the resistance" do you mean halved the resistance from 1 k ohms to 500 ohms for example?

"note: I am assuming you did find it dropped by the fact that you were increasing turns each time despite the fact that you can't have been pushing the wire near it's max current. However such a result would be in seeming contradiction of getting more energy out when the number of turns was increased."

I was simply using  Faraday?s Law of Induction and increasing the number of turns in my secondary to increase the output voltage across the load.

"This would lead me to another question and that is, when the number of turns was increased could you pull the same current as the last test while realizing a higher voltage? (or was it a higher voltage but somewhat lower current?)"[/size]

I didn?t focus on the current in fact I didn?t care because of Mr. Ohm's - all I cared about was:

1) Is my voltage across the load increasing with increased turns in the secondary?
Answer YES.

2) Is my primary power consumption increasing with increased secondary turns and secondary output?
Answer NO.

Ok Toroid Tech keep giving me more secondary turns until the output voltage goes south or until the output Power P = V^2/R across the load exceeds the input.

We were at 170 V and needed 220 V to be over unity but ran out of room on our toroid and I had the ?bright idea? to increase the core material permeability instead of increasing the turns ratio which may be right or wrong.

I just didn't see any reason to continue winding when we could use the cores permability to increase our output more easily. Also I didn't think that I would be pushed by you guys but I am glad it worked out this way.

Cheers
Thane

[Heinstein]

Hi Thane,

Would you mind telling which software you use nowadays for modelling your toroid setups?
Is it from Ansoft?

rgds,  Gyula

We are working with Mag-Num Consulting Services, LLC they use:
Mag-Num Consulting Services, LLC is an organization that provides customers with information on the electromagnetic field behavior of their devices using state of the art electromagnetic Finite Element Analysis (FEA) software provided by the Ansoft Corporation. www.Ansoft.com

Cheers
Thane

[Mr.Entropy]

Wouldn't you just put the 2 secondaries in series?

You want the secondaries to generate equal and opposite flux. If you tie them together in series, what you get is equal current.  This is approximately the same thing, but not quite, because the flux depends on coil geometries + things that aren't going to be exactly the same on both sides.

The easiest way to get equal flux is the make one of the secondary loads a little bit adjustable, so you can tune it to maximize power output.

[aether22]

"Thane, if you halved the resistance in the secondary circuit in your tests when you were getting (I think it was) 170v across your load, did the voltage across your load drop?"

When you say "halved the resistance" do you mean halved the resistance from 1 k ohms to 500 ohms for example?

Yes.
Here's the thing, you can take a normal transformer and measure the open circuit secondary voltage (no power) and double the number of turns and measure double the voltage, that's not interesting.

What IS interesting is if you take a transformer and measure the voltage across a load, say 1K (giving you a predictible current) and then double the number of turns giving double the voltage and hence double the current across the 1k load (quadrupuling the energy) without loading the primary any more.

And if you can do that yes you should be able to halve the resistance that you measure the resistance across and still measure the same voltage across it and hopefully no more load on the transformer.

This is very important, if this is not happening then the transformer isn't working like either of us think.

[Mr.Entropy]

When you say "halved the resistance" do you mean halved the resistance from 1 k ohms to 500 ohms for example?

Why that nasty 1KOhm load?   Wouldn't you expect to draw maximum power when your load impedance matches the secondary coil impedance, i.e., 20 ohms or so?  If it doesn't end up loading the primary, then that's many times more power than you would get into 1K.