Magnetite Cores

[dmonarch]

Was wondering what research others have done with magnetite cores. A mate has managed to find a source for black sand in the USA 7 dollars per 2kg which comes to 40 dollars aus including shipping.
I know another mate in sydney has done some work in the area but with not much success.
Cheers
Damian

[theremart]

Cores

Was wondering what research others have done with magnetite cores. A mate has managed to find a source for black sand in the USA 7 dollars per 2kg which comes to 40 dollars aus including shipping.
I know another mate in sydney has done some work in the area but with not much success.
Cheers
Damian

There is a video of a guy who uses this stuff on youtube. Some people like Erwin harvest their own. Muller the man who could do the magic with this stuff got his supply from somewhere in Canada.

This is info from Konehead, a friend of mine on EV group on yahoo..

"Hi Mart

I got some from a guy in Arizona named Clifford Smith - its high in
titaneous ferrites while Bill Muller got his up in Canada somewhere -
I think abandoned gold mines is good place to prospect for it.
According to BMuller You want "amorphnous" type of blacksanc that has
crystalinne material encasing the ferrites if you look at it with
microscope - the crystalinne material is supposed to be made of
dried up lava...anywasy this creates random polarities to the ferrite
material and neodimium magnet rotors still have a drag to it, but
nothing like iron which is a pure-latch thing within 5mm airgap or
so...this is the big advantage of blacksand.
Steel ball bearings encased in epoxy should be similar too (Bill
Muller idea)
Metglas is another option too and Dave Myrland has some sort of super-
low hysteriss super expensive cores in his Muller machine
.
The titaneous type I got (none for sale sorry since I have very
little left) is supposed to react really quick to polarity changes -
unlike iron which backs up into itself and gets hot getting hit by
neos.

Anyways what you want is lowhysteries, and amorphous typ eof
blacksand...I dont know where you can get any is only problem.

Also Phil had the idea to use green enameled florist wire bunched up
in lengths - maybe strech it first too 20% (John D Shnurner idea)

ciaoK
"

[dmonarch]

Fe3O4

Hi theremart the matarial we found was fe3o4 taken from mines. By the sounds of it it does not fit the bill which is a bugger would like to give the kromrey converter a go using such cores.

[cody]

Here you go bro.
YouTube - Magnetite Cores
I made an updated vid but i havnt uploaded it to youtube yet.
Look up Fe304 on ebay, much cheaper.

[Aaron]

Leon Dragone

Damian,

Yes, magnets as cores...
http://www.energeticforum.com/renewa...magnetism.html

[dmonarch]

Cores

Cheers man for the videos. You didnt show the cores in use. How did they work out for you. Based on the above description of what is required the black sand which can be found across the west coast of nz sounds like the bee's knees. I know for a fact that it is magnetic and does not retain its magnetism and as well it also has a lava coating.
I am going to see if i can get some. Pretty hard seen i live in aus now
Damian

[cody]

I know for a fact that it is magnetic and does not retain its magnetism

This is baffling me. Something magnetic has to retain magnetism. Pure Magnetite is not magnetic, but i have seen others using magnets as cores, but thats not the title of the thread. Loadstone is magnetic however. Regardless, i put up my updated video so you can see some more.
YouTube - Magnitite Cores 2
A little info on these cores:

They have a lower inductance than silicone steel cores

They have a weaker attraction to magnets

They dont have residual magnetism, or at least its extremely low, this is good because you collect all of the collapsing field in bedini motors etc.

Non conductive

Easy to make

[dmonarch]

Thanks

Thanks Aaron for the info.
Cody thanks for the new video. How are the cores working out. I notice in the following video you show a hv spike from the following setup
YouTube - codygillespie's Channel
I was wondering if you could try something. You have a seperate wheel which controls the switching which at the moment swithes when the sine wave is at peak. I was thinking of the kromrey converter which does not switch over when the magnet is dead over the coil but when it is 180 deg or 90 deg our phase depending upon the setup, essentialy creating a vaccuum. Unfortunatly though i dont think you will be able to spin the wheel by hand fast enough
Damo

[Ted Ewert]

I've built quite a few cores with magnetite sand. It has advantages and disadvantages.
It's good for things like generator cores where neos are used for magnets. It is highly resistant to eddy currents and won't get hot like some steel cores. It's better used in high voltage, low current applications since it has a low permeability. It has a very high electrical resistance because of the resin.
It's a core that "stores" energy, like you would have in a choke or a flyback trafo. These cores act differently than, say, a transformer core with shunts between poles.
In order to make it into a core, I mix it with resin and let it set in a PVC mold. Sometimes I mix in steel shavings for a little better permeability.
A local beach is my source. I take the dogs with me and collect black sand while they chase seagulls. I made a tool with a magnet in it which allows me to gather around 20 lbs per hour. It takes some shaking and swirling to separate it from the regular sand, but it comes out pretty pure in the end.
There's nothing magic about it. Like I said, it's good for some applications and in others it doesn't work well at all. I still use a little from time to time, but I found that old trafo laminations work really well for what I'm doing now.

Cheers,

Ted

[dmonarch]

Cheers

Cheers Ted. What is it that you are doing now that would not utilize such cores
Damo

[dmonarch]

Where are you

Hey ted where are you in the world. THat is where are you collecting the sadn from

[dmonarch]

Purpose of Black Sand Cores

I was under the impression that the idea of the black sand cores was to combine all the benefits of a ferite core and all the benefits of a air core. That is magnetic field focuses like ferite core and collapses quickly like air core. Is this correct
Damo

[Ted Ewert]

Cheers Ted. What is it that you are doing now that would not utilize such cores
Damo

I'm using switched neo magnets. Magnetite isn't permeable enough.

Hey ted where are you in the world. THat is where are you collecting the sadn from

I live close to San Francisco. Ocean Beach, on the west side of the city, is full of magnetite. The further south you go down the beach, the higher the concentrations.

I was under the impression that the idea of the black sand cores was to combine all the benefits of a ferite core and all the benefits of a air core. That is magnetic field focuses like ferite core and collapses quickly like air core. Is this correct
Damo

It depends on your application. It also depends on the size of the core in relation to the coil. Magnetite is quite similar to ferrite in how it behaves. However, I haven't done any comprehensive comparisons and this is all just opinion.
What did you have in mind?

Ted

[Inquorate]

Black sand

I had no idea the black sand on beaches was magnetic. I do know they mine it to produce titanium dioxide - white powder that holds pigment, used in paints and lipstick, etc.

@ dmonarch - I could probably send some neos to a friend in south west of western australia; lots of black sand on the beaches there. It would take a while but let me know if you want me to start the ball rolling.

[cody]

Damo,
In the video you are talking about thats not the same coil, that one has a regular iron core. Also i was a little off on the voltage and switch closure in that vid and have learned more since then, i need to make an update of that vid too. You can see on the rotor im using ceramic magnets. Ted is correct, use neo's if your using magnetite. Im not really ready to say any more other than what i posted above. I think the info you really want is going to require lots of tests, i just havent done it yet. I know Jetis made some magnetite cores too, but i think Ted has the most experience with them out of everyone on the forum. So im afraid this may be as good as it gets until some more tests are ran.