FUELLESS CAR PROTOTYPE by ISMAEL MOTOR

[kEhYo77]

Hi All


Here is my video of something related to this thread.
Pulse Motor Generator Coil Shorting Test


A Hall sensor triggers a MOSFET transistor to activate the driving coil in attraction mode to the rotor. The stack of magnets behind the driving coil is in opposition to the rotor.
When the driving transistor shuts off, the magnetic field from this stack pushes the rotor away from the TDC. When there is no power applied the rotor is affected by cogging only a little as the stack of magnets is pushing away while the iron/magnetite cores of the generator coils pull to the TDC. The rotor consists of 6 neodymium permanent magnets (N50), of which all the poles are oriented with their NNNNNN outwards.
Two generator coils that are connected in parallel are being shorted constantly many times per cycle using two MOSFET transistors connected source to source with bypassing diodes. This pair is being driven from a small variable frequency/pulse width square wave signal generator/MOSFET driver.
Two neon bulbs are connected across the generator coil pair being shorted.
There are moments when they put out quite a light show of purple flashes there.

[MileHigh]

Kehyo77:

Two neon bulbs are connected across the generator coil pair being shorted.
There are moments when they put out quite a light show of purple flashes there.

Let's assume some current was induced into the generator coils while the MOSFET switches were closed.  Then when the MOSFET switch pair goes open-circuit there are no loads across the generator coil pair.  With no loads the generator coils produce high voltage and that fires the neons.

If you put small current-sensing resistors in series with your generator coils you should see a small induced current waveform when the MOSFET switches close.

You could do a spin-down test where you time the spin-down with the generator coils without MOSFET shorting and compare that with a spin-down test with the MOSFET shorting.  We can assume ahead of time that the spin-down test will be shorter with the MOSFET shorting.  This would prove that the MOSFET shorting causes Lenz drag on the rotor.

MileHigh

[Magluvin]

Nice setup Kehyo.  What are all those knobs on that controller? ;]

Well that is at high voltages. Have you tried some various wattage 12v light bulbs? Even some low wattage 120v, 220v depending where you are  ;] 

Mags

[konehead]

hi Kehyo
from the sound of it, it seems your coil shorting lugs the rotor down in lower rpms, and more draw too...especially at the slower speeds you can tell by the sound of motor in the video.
you need to short coils for purpose of filling the biggest caps you can, as fast as possible, and as high in voltage as possible - all the while not affectin rpms or amp draw to motor spinning the rotor....you really should not put a load on it all at once like you have done with those small lights...
peak coil shorting is meant to go into caps first - and these are unloaded caps...

its nice you have the pulser-circuit so that you can do mulitple shorts, BUT it needs to be very precise timing to it and of course very short pulse widths too -  as the reason for any multiple shorts as opposed to just one very quick one, is to first cause the ringing, via the first short, then after that, the additional shorts must align themselves in timing with only the peaks of the rings created....
when the caps hit your load,  at this same time the caps should be disconnected from the coils that were shorted...so you need an additonal "two stage" output circuit...
very nice setup regardless of all this critic!

here is a simple drawing I did of something I am working on with a two-stage output circuit (diode plug in this case with single diodes instead of FWBR, and  filling up two alternating-dishcharge caps and note the "shorting switch")

[kEhYo77]

Hi Konehead, thanks for the heads up.
I know where to go with this with load separation timing etc.
I am getting there I just do things one by one.
Now its finally time for my Arduino to do some shorting and load switching
I was thinking of using another hall sensor with tiny magnets at TDCs of N and
'silent' S poles to trigger the shorting sequence only at TDCs.