Magnetite Cores

Demonstration of making magneitite cores. Robert Adams and others have claimed magnitite cores made thier motors more efficient. I am not claiming that yet for I havnt done any tests to prove that yet, however i can tell you that they seem to make a weaker electromagnet and are less attracted by magnets that than typical silicon-steel cores. Im going to try and update this as i make new findings.
1/30/2009
The lindemann attraction rotor i was working on is not going to work with magnetite. The coils magnetic field is to weak for that. It also preformed poorly with my magnet rotor until i discovered something. I was using weak ceramic magnets, the type bedini suggests. They attract very little and repel very little to magnetite. However, i tried some strong neodymium magnets and it preformed very well. Neo magnets on the rotor are the way to go with magnetite.

Category:

Education

Tags:

• pulse motors
• coils
• bedini
• lindemann
• magnetite
• adams

[johnb003]

You mentioned black sand in an earlier comment. I've heard this makes a good core for very fast switching, but I have not tested it. Have you tried it? What do you know about it?

So how would this compound compare to say, an iron core? I'm guessing since it's non-conductive there wouldn't be any eddy currents, but if it responds to the magnetic field, shouldn't it have strong attraction to magnets?

[codygillespie]

Chemically, black sand is the same stuff that im using. Iron will give you a lot more inductance but is subject to more magnetic eddies and dosnt completly release all its residual magnetism like Fe304. It has a weaker attraction to magnets than iron. More suited for using strong neo mags or high frequency applications.

[TATTOOTRAINING]

cool i was thinking i had to forge the iron to the shape i need. and the bridge or yoke you made ..you said it make it draw less and put out more? where can i read more info on this

[codygillespie]

well i would not go forging iron for a core, it would be better to buy some laminated silicon steel and have some one cut it for you like standard transformer cores are made if your wanting to use iron. I believe robert adams talks about connecting the backs of his coils for improved efficiency.  Other than that i dont know where to look, just play around with it, its easy. When you connect the backs you will see the amp draw go down and the rpm's go up.

[69iron69]

I wonder if you ran current through the coils while the resin was liquid would help the magnetic alignment after the fact.

[TATTOOTRAINING]

cool, will do .thanks

[twilight1138]

The red stuff is most likely Fe2O3, which is not magnetic and won't work as a coil core.

[codygillespie]

I suppose you could. But that would not be the same thing that i have here. Pure magnetite is not magnetic at all. Lodestone, is magnetic and made from magnetite, again not what im doing here. If you want to play with magnetic cores you probably dont have to crush magnets, just wrap your coils around them.

[fdoca]

Hello:

U can hammer down to any magnets to powder then mix with resin, this will create the magnatic ferrite core.