The Ossie motor

[woopy]

Hi frenky

nice work

As you use the double flat coils in paralell as per Garry Stanley . Can you make some test and shortcut the coils in freewheeling to see if they brake the rotor (Lenz law)

Regards and good luck

Laurent

[futuristic]

Hi. I have already tested that by mistake. 
At first run I wired coil pairs wrong and there was big slowdown of rotor.
After that I re-soldered the wires of coils correctly and now rotor spins freely.

I have now also made version with optocoupler but there was nothing interesting going on.
Will still upload video and scope shots...

Frenky

[futuristic]

As you can see in this version with optocoupler there is almost no negative current flow and that is bad. Not sure why though...

opti1-coil.gif shows voltage across 1 coil
opti1-res.gif shows voltage across 1 ohm resistor

Txt files are raw scope data.

Frenky

[gyulasun]

Hi frenky

nice work

As you use the double flat coils in paralell as per Garry Stanley . Can you make some test and shortcut the coils in freewheeling to see if they brake the rotor (Lenz law)

Regards and good luck

Laurent

Hi Laurent, and All,

Years ago Ron already made such tests you just suggested to Frenky, see this link here: http://student.ccbcmd.edu/~norman/pugh.html

Ron used the same flat coils Garry Stanley used too and now Frenky has shown. (Such coils came out from old 5 1/4" floppy drives, one such flat air core coil has about 1.1mH inductance and 4 Ohm DC resistance.)

Please read carefully all the tests. It turns out that a parallel connected coil pair (with the + of one coil end tied to the - of the other coil and vice versa) if loaded, produces Lenz effect. However Garry Stanley DID NOT use these coils pairs (he had 12 coil pairs and 12 facing magnet pairs) for GENERATING, he used them as motor coils, to attract in the magnet pairs till TDC then he switched off the coils by a bipolar power transistor.  This is where the misunderstanding was based: everybody expected from these coil pairs to get induced energy too. Garry did not design a generator with his parallel coil pair idea but a motor.
Garry did answer the question of how he thought to use these coil pairs for generating: just after the magnets pass TDC, the paralleld coils should be opened (say by a reed switch or whatever that was closed on approach till TDC)  and this way the individual and open coils could feed capacitors via diodes from the changing flux they sense from TDC and outwards from the  leaving magnet pairs.  This needs experimentation of course, I am not aware of any such test results from any body.

So there is no Lenz effect after you switch the coil pairs off at TDC and you do not load the coil pairs with anything. And before TDC, as you switch the coil pairs on to attract the magnet pairs on the rotor, there is a normal permanent magnet <-> air cored electromagnet interaction: the fixed coil pairs attract the rotor magnet pairs, the coil pairs have a closed circuit via the switch and the inner resistance of the battery, (under this coil pair ON time the situation is the same as like Ron test shows in Picture 7) hence there surely be Lenz effect in the attract mode but it is 'counteracted' or 'overwhelmed' by the battery energy for the whole attract time.

Now it would be too easy to abandon tests with such parallel coil pairs used in this setup, what would be good is to try opening indeed  a coil pair just after TDC and see how much 'juice' could be collected from any one coil individually and also see how such load on the opened pair may affect the rotor moving smoothly away.
If I recall correctly, Garry wrote he measured about 9V induced AC voltage coming from one flat coil, unloaded,  measured continuosly, not just after TDC, at the same rpm while he operated a test motor on a 12V battery. He did not have scope but a multimeter only.

rgds, Gyula

[futuristic]

Just some calculations of the version v1 with reed switches that performed better.
As you can see it seems that all (and more) current that goes into motor comes back and also the motor is doing work by working against friction.
And I think I can do better. 

Frenky

P.S.
Because forum doesn't allow .xlsx files excel is here:
http://file.si/pfiles/10422/Dso-data.xlsx