Shorting coil gives back more power

[forest]

I'm just wondering. Isn't that another example of a rule " don't kill the dipole" ?
We have magnetic dipole inside coil. We know that when coil is disconnected there is back EMF impulse, and we know that really this impulse is nothing but natural LC oscillation of coil self-inductance and distributed capacitance. The only problem is direction os that back emf.
When we make&break at the peak of magnetic field there is a one way situation because magnetic field is going to change into electric. We are somehow converting that small portion of magnetic field into forward EMF !!! Doing it exactly at natural LC resonance we could have gain and maybe also do not deplete source.

[forest]

or maybe I'm wrong  maybe it's about capacitance of coil

[woopy]

Hi all

2 other cents

http://www.youtube.com/watch?v=QanbffVFZPU

hope this helps

good luck at all

laurent

[romerouk]

http://www.youtube.com/watch?v=aYaPvGipao4
Shorting the coil will produce a powerful high voltage spike that charges the capacitor very fast.The rotor remains unaffected even when the coil is shorted continuously.The position of the reed switch is critical to get the maximum spike and maintain the rotor speed unaffected.
People trying to replicate this type of rotor make sure that the magnets are secured properly - they can act as bullets(it happend to me too).I have used a plastic ring 2 layers, cut and made from a plastic watter bottle.

[hartiberlin]

@romerouk
well done !

Can you try to put a about 5 Watts 230 Volts incandescent bulb lamp
across the cap as a load and see, if it lights up ?

Or put 50 white LEDs in series and see, if they will
light up ?
(use an additional  series resistor so you don´t  blow them up the first time...)

Regards, Stefan.