Sphere Magnet Spinning with Degaussing coil & function generator

[LUCKY4908]

good project, not bad , but it would be way better without noise (if possible) ,,,

[SeedsOfFaith100]

I believe what you have is a classic magnetic stirrer that labs use to stir liquids in

glass containers.

[ManOfSt33lcf]

um this may sound dumb but do you know were do they sell the magnet spheres? and do you kno what is the brand name is too?

[64298]

Hi Dave,

I just bought a 12 inch degaussing coil and the seller measured 79 ohms across the plug ends.Its on its way to me now. I know its not the 300 ohms you measured but I thought I would try it anyay. Nothing ventured nothing gained.

In the meantime I found a square wave oscillator circuit that can be adjusted from O upwards in frequency. Works on a 9 volt battery Costs less than $5 for parts.

If it works out I will post a video on U tube..

[retrod1]

Well, I guess we will see if the mass of the coil is important, I think it might be. Another concern is that you may not be able to generate a high enough amplitude signal with the simple oscillator. I think a single mosfet amplifier stage could be added on if need be.

[64298]

Hi Dave,

I would like to construct a 12 inch diameter degaussing coil and see what it does with a function generator.

How many turns of 30 gauge AWG wire will guive me 300 ohms at the plug end when wound around a 12 inch diameter form?

[retrod1]

I don't know how many turns . The wire calculator says you would need 2760ft of 30 AWG to reach 300 ohms. That's a lot of windings. I suspect the wire gauge in the degaussing coil is smaller still.

[XenomorphLabs]

Its usually 400-500 turns of awg 22-24 wire according to DIY forums on making degaussing coils.

[retrod1]

The coil I use measures close to 300 ohms. Using a wire calculator that would need 18,000 feet of 22 awg wire. So I believe the wire diameter is much smaller in this coil. As I recall the coil also has a rather short duty cycle. Something like 30 seconds on and five minutes off.

[XenomorphLabs]

I actually did some google research on those degaussing coils, and in some DIY forums people report that an average degaussing coil contains about 400-500 turns of AWG22 -24 wire, so its actually not that thin wire as i thought and really surprising that such a low turn count yields a high output or retrod1 has an exceptional coil with much more turns.

So obviously the big flux permeated area of the coil goes heavily into the high voltage yield.

Much like in the Bedini/Cole window motor coil

[comwarrior69]

interesting... would be interesting to know whats actually in those de-gaussing coils...

How much power is it using from your square wave generator?

[retrod1]

I hope to get my scope working again this weekend, it's been idle for a couple decades, lol!

[JavaLessons]

Don't you just love surprises !

[retrod1]

Only the good kind :-)

[jonnydavro]

Kind of interesting! I would say pretty amazing,nice find Dave.Please show more as this is quite fascinating and now we know you can do this with square waves and the right coil,it has opened another direction for research.Nice work.Regards Jonny

[retrod1]

Thanks Jonny. I posted a new vid with some thoughts on the coil and also demo the start-stop sequence.

[XenomorphLabs]

Excellent ! As Lidmotor said we tried to only use the bedini main coil to start it.

I am having trouble understanding what happens between the coil and the sphere but it works great. Please do make a video of how your spinning magnets wander to the middle too.

I am currently also experimenting with different pulses going through the coil.

Keep it up !

[Lidmotor]

Well done!! Xenomorph and I both tried unsucessfully to get the magnets to spin by using a 555 timer circuit that was producing a square wave. Obviously we were using the wrong drive coil. I'm real glad you got it to work by using the degaussing coil. I need to get one of those.