OK ladies and gentlemen  back to work

can everybody explain this?

I made 3 tests with the repulsion -attraction 1 pulse config  (see pix )

1 with 2 coils in serie  ands i (get as reported ealier) about 0.5 to 0.6 miliamps for a 185 rpm.

2 when i open 1 coil and connect the second one directly to the circuit , That is to say that there is only one working coil , i get about 2.3 miliamps  for 354 Rpm    almost 4 time more current for only the double of rpm ?

3 when than i connect coils one and two directly in parallel to the circuit , that is to say 2 separately working coils, i get 4.3 miliamps curent and the rpm does not increase  ( the torque seems to be stronger but difficult to measure with my fingers)

thanks for replying

Laurent

Hey all
I have a question maybe some here know about. I was using a diode in series with my reed to prevent bemf from getting back across the reed, because in certain situations while capturing bemf I would see sparking when it should have gone to the capture circuit, but apparently not all of it. Now the bemf was about 260v to a cap without a load.
The series diode is a fast switcher 400v prv. So from what I know this far into this game, that 260v should not be able to cross the diode in reverse. Is it peak bemf voltages that I am not seeing?

Im not working on that a the moment, but in my daze from being a champ winder all night, I was just thinking about that and why.

Thanks


Mags

@ Gyula

thanks for your answer. I will try this weekend to store more info . Perhaps we can be more aware of what happens with more experiments  i hope

@ Mags

Hi Magchamp thanks for your answer  and  now after one night winding what about your fingers  ? for myself   i use  silk gloves  ( please be smart  hi hi!)   to avoid finger burnings when i wound my coils with my windingmill. so easy and fast.
that's why i don't like toroidal winding

and another interesting week end in perspective

regards

Laurent

Hi Laurent,

I think Tesla Coil for electromagnets patent may be a good answer for you first question.  It includes a huge benefit: if one could build such coils with a resonant frequency near to the one that comes from the rotor RPM then the input current to these coils would not find any inductive impedance, only the copper wire resistance would limit the current. (By winding the two parallel wire the way Tesla drew and connecting the ends as he showed, there will be a resonance circuit developed from the coils and the distributed capacitcnce created by the closeness of the two wires,  and behaving as a series resonant circuit.  Problem is that for normal RPMs like a few thousand, the resonant frequency is around some ten Hertz, it seems impossible to find a high dielectric material which would insure high enough capacitance for the limited number of coil turns to reach the low resonant frequency.
But I vote for flat and thin round coils anyway.  Thickness seems important because a thin coil demands for a small airgap between the facing magnets, and this involves higher flux density hence higher torque.  And I also think that using many such small flat coils as stators, distributed evenly around the rotor circumference, would enhance torque manyfold because it would involve many magnets hence much more flux to deal with.

Your second question connects to also the question of how flux density could be increased, using soft iron back plates is a good solution for this effect.  (Door magnets utilize such back plates to increase their attract force.)

rgds, Gyula

PS here is link: http://www.tfcbooks.com/patents/512340.htm to Tesla electromagnet coil if someone wants to read it.

Hi Neptune,

Yes, I have thought of that already, thanks for bringing it up and it may work in the same way as if it were the distributed capacitance.  It surely needs testing, I have not built such flat coils that thickness is constituted by the wire diameter only.

I have attached a drawing how the addition of a normal capacitor ought to be connected to get the same effect. 

To get close to the needed resonant frequency, say your motor's RPM is 1200  then you divide it by 60 to get it in 1/seconds i.e. in Hertz. (1200/60=20 Hertz)

This is a very low audio frequency and if you can make ,say, a 1mH bifilar flat coil as Tesla shown, it would need a 63325uF non electrolytic capacitor.  (I used this link: http://www.whatcircuits.com/lc-resonance-frequency-calculator/ )

I chose 1mH because for flat coils like these with a single wire thickness you cannot make much higher inductance coil, rather only less.
See this link: http://deepfriedneon.com/tesla_frame6.html 
If I choose D_I=3mm   N=60   W=0.1mm  S=0.1mm (this turn spacing will come from the second 0.1mm parallel wire), then the inductance comes as 41.5uH, obviously for a non bifilar case, and when you connect the second wire in series as shown by Tesla, the inductance roughly becomes 3.7-4 times as many i.e. 3.7*41.5=153uH And for this coil the outer diameter already comes out as 27mm!
For such a low inductance the resonant capacitor for 20Hz is 413,894uF!
A rather difficult value in practice.

Of course to test this all, you may start out with conventional bifilar coils wound on normal bobbins because that way you can really get bifilar coils (connected the two parallel wires in series as Tesla showed) several tens of mH inductance hence the capacitor value gets more practical, though still in 1000-2000uF range.

When you have wound a bifilar coil and connected the ends as Tesla showed, then you may use an inductance meter to get the resultant inductance between the two ends indicated in the patent drawing. Then you can figure out the needed capacitance to come near to resonance.

rgds,  Gyula

Hi.

I'm watching your progress with great interest.
Sadly I won't be able to make any experiments for about a month because I have bought an old apartment and I will be working on renovating it so I can start living there as soon as possible. But after that I will be able to work on experiments on daily basics. 

Bye,
Frenky

Yeah it will be great when it will be done. I already know which USB scope, function generator and LRC meter I'll buy for my "home lab".   
But that will be probably in somewhere in the year 2013 because I will be so broke after renovation. 

Laurent, see what member BEP says on flat coil:
http://www.overunity.com/index.php?topic=6640.msg158978#msg158978

"The real beauty of this type of coil is it tells Lenz to blow. The induced field is perpendicular to the approaching field instead of opposing.
Bang one of these with a sharp spike and there is a 'clapping' in the center like no other. It is like stomping on a ripe banana. Everything squirts out the axis."

EDIT: and here: http://www.overunity.com/index.php?topic=6640.msg158832#msg158832