Bedini SSG - self sustaining

[Magluvin]

Thanks Plengo
In the last 3 vids, I am only using 1 reed here to activate the 3 coils in parallel then capturing the bemf only from the coils. The lil green coil doesnt need to be there. The 2 larger coils in parallel are doing all the work. They are 0.9 ohm each and the green is 7 ohm.
I am running 4 AA nimh in series. They put out about 5.2v to 5.3v at rest after settling from full charge. It runs quite well on 1 AA also. The small reeds were an obstacle for me before. They couldnt take what I wanted them to.
In the circuits you show above, there was definitely an offset to when the reeds were pulsing, those lil reeds could never handle these coils alone.

The mags I am using are 1/2 x 1/8 diametric disks N42  KJmagnetics. 16 of them.
I am making a new platform for all this to set on tonight. The vid setup was just with what I had around to try things before settling on the way I want things.  But now it all seems worth setting up nicer and more permanent for working on. It will have more room to work and set up more coils and reeds for going forward with the previous circuits above. And it will clearly show what is going on better for vids.
The bemf capture in this setup has impressive output. I would say enough to run another separate pulse motor setup.
I was thinking of a transformer to change the ratio of bemf voltage/current, but just applying caps and load seems to do the same without transformer inefficiency. I have to use a heat sink on the bemf diode, the lil schotky died on me due to too much current into the 5 ohm 5 watt resistor.  Unbelievably, of course.
The speed of the switching improves things here also. Getting that rotor speed really helps shorten those pulses and bemf output enhanced. Something I just could not get with smaller reeds.

Magluvin

And Bebe helps hold the meter for me. =]

[gyulasun]

Hi Fausto,

According to your PIC control codes (from your Reply #140, previous page) switches 11 and 12 are turned on at the same time, right?  Can you tell, how long this simultaneous switch-on for these two switches lasts?  (Maybe about 27-28 millisecond?, guessing from your scope pictures.)

(Your opto switch has a rise and fall time of 7-7 us (microsecond), from its datasheet, just for the knowing, no problem seems with this here. And also the MJE3055 has a f_T=2MHz (a frequency where its Beta gets reduced to unity.)

So returning to my first question of the common on-time for Q11 and Q12 switches, whenever this common switch-on happens, then the battery gets short-circuited by these switches via the coil L1, right?
And assuming your measured current of between 10uA to 110uA means an average current, there must be much bigger peak currents flowing because the 55.7V battery pack is shorted by Q11 and Q12.  Maybe you have checked this already with a series small value (0.1-0.5 Ohm) resistor's voltage drop, observed by the scope?

One more thing on the switch: the MJE3055 has about a 60V collector-emitter breakdown voltage limit, this means  leakage current near the 55.7V battery voltage may start increasing, hence some current may flow through in the off state too, thinking on the undriven but included Q3, Q4 and Q8 too.

Finally I would like to know how you mean the 0.5 pico second on the last scope shot? (quoted in bold by me below)    Maybe a misprint?

@Groundloop

the horizontal was 0.01 seconds. Vertical was 0.05 volts / div. The last scope shot was .5 pico-seconds.

Also, it is ok you wrote it is a 10V pulse instead of the 100V but I still wonder if I see the total amplitude of the negative pulse in your first scope shot or simply the very bottom of the peak amplitude is not shown?
I ask this because at 0.05V/DIV range setting I can see a max of 3.5 vertical divisons for the spike which would give about 1.75V, not 10V. Is this ok?

This circuit behaves strange for sure, I wonder if the battery voltage kept increasing steadily, after your report in Reply #140?

Regards, Gyula

[Magluvin]

http://www.youtube.com/watch?v=PUoKzD6acB4

A vid of my improved setup running 3 coils in parallel, 0.14 ohms.

Mags

[Magluvin]

http://www.youtube.com/watch?v=b7PR8JEVp7A

This is a second vid of the improved setup, made some reed adjustments by adding another magnet and she is running fastest ever. plus more bemf output.
Mags

[gyulasun]

Hi Mags

Very good setup and test! 

Can you somehow estimate your input current from the batteries so that you could figure out the input power, now that you know the output.

rgds, Gyula