STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[gotoluc]

@ Gotoluc

Thanks very much for sharing all your experiments here and on all the other place where you post

I am very interested in the Orbo config and also in the Ossie motor . I have seen your last experiment with the "assymetrical winding coil" and i have made a rapid and crude replication.
As you said that if it was different polarity on the magnet it could be better, i did mount this coil vertically and i used HDD magnet for this very first test. An it work at once without problem, from 1.5 to 7.2 volts and than my setup is much too bumpy. But good test.

But the aim of this post is that i measured the inductance of the coil when the magnet is passing this very particular coil.


First the semicoil (not joined ) are 1.2 ohms each    and once joined  they have 2.3 ohm  (      3 layers of 0.3 mm wire  about 5 meter on each semicoil  on a standard ferrite core )

second the inductance not joined  are 70 mh each   and once joined   they have about 286 mh ??

than when i let the magnet pass in front of the coil unjoined the behaviour of the inductance is normal that is it drops progressively  from 70 mh to o.o1 mh at TDC  and back up 70 mh

But once joined  the inductance begin at   286 mh,

than approaching the magnet the inductance drop rapidly and began to turn negative until  - 536 mh      MINUS 536 mh and than go up to - 105 mh at tdc   than the magnet passes the coil and same effect on the other side up to 286 mh.

is it possible to get negative inductance ??  Is my meter fooling me ?  Have you any idea  ?

I enclose some pictures to better explain

Regards

Hi woopy,

thanks for being the first to replicate the GOBO split coil

I can't comment much on your findings since I just found this effect about 12 hours ago and posted a video to get others to look at it.

What I have found is there seems to be one way to connect the coils that gives the best result. So anyone can try this. Connect it one way and try it and the flip the wires around and see the difference. The coils may not need to be one CW and the other CCW but this needs to be tested to confirm that.

I'm in the middle of building a dual magnet rotor today and will post a new video when I have it done.

Happy experiment and please continue to share your findings as you have done.

Thanks for sharing.

Luc

[synchro1]

The Orbo Toroid needs to be precisely centered on the Bloch Wall between the A poles and the Toroid edge needs to be positioned  precisely in adjacency to the Neutral Line, on the perpendicular. Both these neutral zones require toroid adjustment within a half millimeter range, a split hair width; hence the hard drive tolerance comparison. Perhaps two Piezo Nano-Positioner chips, one behind and the other under the Toroid, with feed back circuitry might help keep the Toroid adjustments in optimum range. The problem with this upgrade is that it adds a huge cost to the equipment. 

[synchro1]

The Orbo Toroid needs to be precisely centered on the Bloch Wall between the magnet poles and the Toroid edge needs to be positioned  precisely in adjacency to the Neutral Line, on the perpendicular. Both these neutral zones require toroid adjustment within a half millimeter range, a split hair width; hence the hard drive tolerance comparison. Perhaps two Piezo Nano-Positioner chips, one behind and the other under the Toroid, with feed back circuitry might help keep the Toroid adjustments in optimum range. The problem with this upgrade is that it adds a huge cost to the equipment. 

[neptune]

This is an idea which might be total rubbish . What are the magnetic characteristics of recording tape ? With tis tape , you could wind your own toroids and glue them together. Make them any size you need . Just a thought...

[woopy]

@ Gyula

thanks another time . You are right i have to change the setting to 200 mh and the reading is now correct with 0.05 mh at TDC    ouf !!  ha!! these cheap  instruments !!

@ Gotoluc thanks for the answer I have just tried to inverse the connection and it works very well too. Will follow your video tomorrow

regards

Laurent