Shorting coil gives back more power

[giantkiller]

http://www.youtube.com/watch?v=G2qSe2YsEQM

Right out of the Kunel patent and Bolt's specifications.

Iron wire core.

In previous consults with other OUers the last year we discussed the magnet types. Magnacoaster, in one video, said the weak field was by cabinet magnets because NiDb magnet fields were too strong and the Bloch wall could not be swayed, jacked or broken. In one vid he used a chunk of steel and put a small NiDb BB on it at the back end away from the gap.

[bolt]

@bolt

Great post, thanks for the photos.

You write,
Can someone post a schematic, photos, or any other sort of documentation on  this for a starting bench replication?   Or links to the place to look? etc

Thanks

I am sure everything you need is already here. Start back in the old magnacoaster thread. The pulse driver is the same thing used all over this forum its basically just like a 555 driving a fet which bangs the coil. You should high side drive it though because the flux modulation likes positives pulses apparently. If you low side it then you end in essence pulling lows then it float up as a floppy high. I am pretty sure you can get results with very simple circuits. Magnacoaster got this going using a wheel and a car points as a switch then later went to fets. Until you get deep study on the bench and tried it, no one really knows the perfect frequency, shape, amplitude, etc  it does look around 20kHz- 50khz which seems about right. More then this will create a lot problems with heat and coil core materials. Advanced circuits may well use Hi Low drivers and an  H bridge to get symmetrical power drive.

Anyway sorry for taking this thread off track BUT if you have coils and magnets in front of you then you might as well combine all these technologies into something useful.

[Goat]

@ Bolt

I agree with your views particularly the "Magnacoaster got this going using a wheel and a car points as a switch then later went to fets."  I remember watching the early video and wondering how the circuit inside the box was related to the "wheel and car points" and the magnets and was feeding back to the battery to keep the 12V to 120V inverter going...Why was that method abandoned when it could have been implemented on a smaller scale and sold as a kit or a ready made product on a smaller scale to supplement bigger advancements... 

Is there a way to backwards engineer his first design?

Regards,
Paul

[forest]

Is there a way to backwards engineer his first design?

Regards,
Paul

From patent maybe ?

[popolibero]

http://www.youtube.com/watch?v=G2qSe2YsEQM

Right out of the Kunel patent and Bolt's specifications.

Iron wire core.

GK, wow you put my drawing at work quickly,  

The Kunel stuff tends to use the control coil to neutralize (hide) a magnet from the pick up coil(s) and let go. In this case I think it's really just shifting the bloch wall, in a very powerful way.

Mario