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

[callanan]

"
With my current configuration I can achieve a consistent 750RPM for only 239mW of input power!
"

Dear Ossie,

  Coul you please attach an efficient 12VDC, 5 W motor to your shaft? You can find in old CDROM etc..

   If you could find a such small DC motor with 750 rpms and attach to your shaft I beleive you will show self runner righaway..

   Maybe you can also add a buffer cap to start and regulate the system?

   Can you let me know the specs of the magnets and toroidal core? Also tore winding (gauge, number of turns..)

   Thanks and Best Regards.

Hi samedsoft,

The magnets shown on my motor are from this same place (link following) which I got a few years ago, although I think mine are actually 22mm x 4mm which they may no longer stock. But regardless, I have now run this motor with many different magnets and magnet arrangements and it still works well. I have even used weak ferrite magnets. You just need to find the best magnets and arrangement to work with your toroid coils and cores and rotor.

http://aussiemagnets.com.au/product/-21-x---5mm-Disc-%28Rare-Earth%29.html

In regard to my toroid coils and cores, I have posted all the information about them previously in this thread.

Regards,

Ossie

[gyulasun]

Hi Ossie,

I wonder what causes the small (0.35V) negative going 'bump' between the normal on-off pulses?

Thanks, Gyula

[callanan]

Hi Ossie,

I wonder what causes the small (0.35V) negative going 'bump' between the normal on-off pulses?

Thanks, Gyula

Hi Gyula,

I am thinking it is due to imperfections in the coil windings. Whatever it is, with the circuit I am using, this negative voltage bump will help send energy back to the battery via the two feedback diodes. So I don't mind it being there that much...

Regards,

Ossie

[powercat]

2 new from TK.
Orbette 2: Acceleration
http://www.youtube.com/watch?v=Lq2pYkQKuo0

Orbette 1: Layout, scope interpretation, RPM fluctuation
http://www.youtube.com/watch?v=djaMxXqLbdc

cat

[jester]

Steorn
http://vimeo.com/8356820

Looks like adding pick-up slows the engine down but interesting.

Also, because I believe I have reached a limit to the efficiency, with the current materials I am using, I believe I will now need to increase the number of magnets, coils and possibly rotors so as to be able to generate some usefull torque and possibly even self run if this is indeed possible with this motor.

Regards,

Ossie

you might already have it with regard to the pick up coils I was wondering instead of putting pickup coils on the side of the motor were the attraction of the magnets slows it down as they pass by. Would making it a halo (The coil tap ) a large round horizontal circle and sticking a couple of magnets on the top of the motor and placing the halo above it slow it down as much since the magnets would be always the same distance from the tap. A simple test would be to loop some wire attach it to the multi meter and bring it down over the top of the motor by hand and see if there is any effect.