Self running coil?

[void109]

I also have a 2" Neo but it's 1" and N52. Quite strong so I have it about 2" away in center.

When you move it away from the center, how far down does the 25mH drop to?

Thanks

Luc

If its closer to the magnet (not optimal height), its down in the low micro-henry range.  In sub optimal positions but at proper height, its around 45-50mH.

[void109]

Short video demonstrating what I'm seeing with the core:

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

[gotoluc]

Short video demonstrating what I'm seeing with the core:

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

Excellent video demo

Thanks for taking the time to do this and share what you have found.

Going to have to get one of those cores to test this.

Luc

[void109]

Thanks - sorry for the quality, been awhile since I've uploaded something.

I don't see immediately how this effect is useful.  I would like to understand WHY though, because if its a new phenomenon - and new information, it may lead to something useful.   And if its not a new phenomenon then someone can tell me so and I can stop wasting time thinking about it 

[gotoluc]

I'm no expert but if you can close to triple the inductance of a coil by introducing the center of a permanent magnet that sounds good to me.

One use I can think of is a PM attraction motor. The magnet is attracted to the Finemet toroid core (free work) and when it reaches TDC the coil is energized to release the magnets attraction to the core. Since you can close to triple the inductance of a coil using this Finemet core when the magnet is in the ideal location that it needs to be anyways for best results with this magnet motor design to work, the bonus will be that the coils electromagnetic field will be close to 3 times stronger without using more wire length which adds resistance and longer magnetic field reactance time.

It all looks like a win win situation for this kind of thing to me!

@Gyula, what do you think? Sounds like an ORBO

Luc

ADDED

One thing you may want to check is to what inductance the same length of wire can produce on a regular ferrite core of the approximate same size. If it's as high as you can get the Finemet using the magnet then maybe it's not all that great but if it's the same 25mH then I think this is very good. Please let us know of your results.