Quote from: teslaalset on June 06, 2011, 06:39:57 AM
Regarding explanation, yes, sims show what the reason is. It's mainly due to the delay in BEMF response.

A while ago i even tried to make a picture explaining this. Since then i've been thinking what are the parameters that define the delay of this propagation. There was a video on youtube regarding the speed of ELECTRICITY propagation in the wire and that the time required for this is : L / R seconds to get to 60% of the input power.
BUT induced current and MF propagates very fast ? Depends on the medium the MF is propagating( air ). So you need a huge gap between magnet and coil, or a very fast + specific RPM ? Or reality says something else ?
If you take in count the physical size of the coil, and that the electricity is induced in the exterior of the coil ( inside is shielded ? then it is propagated through the wire in time, the size helps store the energy ?). There should be even a mathematical formula that you can use to calculate for a specific size of coil, what is the magnet distance you need to have from the coil ++ what is the speed rotor and the distance between 2 magnets that due to the delay of the EMF you get a pull effect on magnet 2 instead a push on magnet 1.

Quote from: teslaalset on June 06, 2011, 06:39:57 AM
Regarding explanation, yes, sims shows the cause. It's mainly due to the delay in BEMF response.
So, it's not black magic, all explainable physics.

thanks for your input
what is the main factor? load, timing, magnetic delay ..... or inductance change due to saturation

Quote from: wings on June 06, 2011, 06:50:31 AM
thanks for your input
what is the main factor? load, timing, magnetic delay ..... or inductance change due to saturation

My present impression is that the delay in BEMF is caused by a combination of the impedance of the generator coils and the load impedance, so the ratio of wL and R, in case of pure resistive loads.
Delay can be calculated from tangent(angle) = wL/R, so keep the R as low as possible for maximum delay.
Keep in mind the load R value should be included as well !!
So, the lower the load R, the better in my views.
Since RomeroUK used rectifyer diodes and a big buffer capacitor, load impedance is very low due to that.

This is the reason why shortening of coils is discussed here as well, without the correct understanding why.......
If a generator coil is shortened, resistance is limited to the coil resistance itself.
Since this is normally a very low value, a shortened generator coil generates maximum delayed BEMF.
But how does one obtain output energy from shortened coils?
Well, best practical way is to approach shortening by using some diodes and a buffer capacitor at high rotational speed (which lowers the capacitor impedance, at high RPM the impedance of the capacitor is very low)

High RPM will also help (higher wL value), but don't use just thick single wire, it will cause relevant skin effects causing extra losses.
Litze avoids big skin effects.
That's why RomeroUK uses Litze.

Quote from: teslaalset on June 06, 2011, 06:39:57 AMHaha, now you're overloading me

You see from experience with romerouk I have learned to get all the info you can RIGHT NOW
Because if the experimenter gets too successful then further info may be heavily biased with
"cancer man" type character on the sofa

Quote from: teslaalset on June 06, 2011, 07:02:29 AM
My present impression is that the delay in BEMF is caused by the impedance of the generator coils, so the ratio of wL and R.
Delay can be calculated from tangence(angle) = wl/R, so keep the R as low as possible.

So high RPM will also help (higher wL value), but don't use just thick single wire, it will cause relevant skin effects causing extra losses.
Litze avoids big skin effects.
That's why RomeroUK uses Litze.

that seem in line with Adams motor

http://www.overunity.com/index.php?topic=3842.msg289459#msg289459


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