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

[exnihiloest]

I agree that domain switching in the core takes energy and this may be a possible problem, but you are missing an important factor! In the toroid, at the point when it is energized, the domains are aligned along two separate paths. One half of the core is already aligned in the direction the coil is about to align to, and the other half is in the opposite direction. The current only needs to align one half of the core while the other half enforces the current direction. This condition means that the maximum COP<2. With the heat and core losses it may still be possible to sneak under the wire and end up at some point with a COP>1.

Hi Lumen,
For me, when the permanent magnet is at its nearest position relative to the toroid, the magnetic flux from the magnet is radial from the viewpoint of the toroid.
Thus the coil has to equally aligne the two halves of the core perpendicularly to the magnet field.
When the magnet continues its way, then I agree there is a different angle between the magnet flux and the two halves of the core but if one is enforced, the other one is opposed, and the two halves balance one another, leading to about the same need of energy for aligning the magnetic domains (except that the magnet flux is decreasing because the distance is increasing, but it is another point).

[futuristic]

Naudin has made some progres:
http://jnaudin.free.fr/steorn/indexen.htm#V2%20design
(Scroll down to the section "5 - The new Steorn motor v2 design")

http://www.youtube.com/watch?v=kM3rGz_KyDg
http://www.youtube.com/watch?v=a_gkxfX98as

[oscar]

Hi k4zep, callanan and all

do you have any recommendations for how to determine the number of windings to put on a attractor-toroid?

The more windings the better? I.e. to wind until no more windings fit on?

Or should one make a test? Like sticking a magnet to the wound toroid and then the magnet should fall off when the coil is energized?

Thank you guys and
happy new year to all.

edit: in the meantime I realized that callanan has answered this question already here:
http://www.overunity.com/index.php?topic=8411.msg218153#msg218153
and here:

....
You need as many turns on you core as you can possibly fit of medium to pretty thin wire! This will reduce the current input and increase the core saturation for voltages around 12 volts....

Thanks again.

[void109]

Hi everyone,

Software engineer not electrical engineer here, but I'm eating my way through several electronics texts.  I stumbled on Steorn when they published their initial ad years ago, and now of course I'm all in a frothy excited lather again.

I'm come humbly seeking advice - I looked around on the web, and I couldn't find any place to purchase wound toroid cores.  I pulled some out of an old PC power supply and wound them with what I thought was a lot of windings, ~60 feet of > 30 awg magnet wire, but trying to get the coil to drop attached magnets isnt working out as expected.  If I use a very weak magnet, 14V @ 3A will drop it.  Moderate to strong magnets stay firmly affixed to the coil.

I understand that 3A is way too much for that wire (gets hot quick, and its only 8 ohms), but 50mA wasn't making the pony do its trick.  Is this just due to my core not being saturated due to insufficient winds or a core who's permeability is too high?  I have no idea the qualities of these cores since I yanked them from the PS.

Callanan or others, can you recommend a good core and where to purchase them, as well as wire and wind counts?  I've purchased  several sets of neodymium magnets, an oscilloscope, function generator, and various construction mats and they are inbound via fed ex - I'm very eager to get my own replica up and working.  I'm hoping this community can help short-circuit my path to a successful coil. 

The moment I have a build working (motor turning using moderate to low power consumption) I'll post several vids, to help all the others builders out there.  The vids you all have posted so far are brilliant and I cant wait to contribute.

Thank you very much for any help!

Happy New Year

[void109]

Rodin Coils?

I've wound a couple Rodin Coils (I dont know what everyone thinks of them), and it seems like they create a more focused magnetic field at their core for less energy than their standard wound counter parts.  I was considering setting up the same arrangement but trying to use a Rodin Coil for the toroid with some kind of ferrite rod in the toroids center.

Can anyone with experience with Rodin Coils chime in on this notion?