What metals make the best cores for an Electro Magnet?

In summary, you need to figure out what the core material will be, what flux density you are trying to achieve, how many turns will be needed, how big the wire will need to be, how much surface area will be needed for cooling, and how big the electromagnet will be. You will also need to find the voltage rating for the wire, and the inductance of the electromagnet.
  • #1
Tido611
79
0
I can't find any sort of charts for the stregths of different metals that i could use as the core for my Electro Magnet(EM).

some plans for a E.M. would be kinda cool to see too if anybody has any.

(also, this is my first post on this site and i am really excited because I've been lookin for a quality site like this for a long time. and i know that i will be asking a lot of questions because i still have a lot to learn.
 
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  • #2
You do mean "magnetically strong", not tensile strength, right?
It all depends on how much you want to pay ...
and how much machining you plan to do -
I won't let you grind magnetic steel on MY grinder!

You'll need to decide whether you want high maximum field,
(the extreme coordinate on the "hysteresis curve/loop")
or whether you want good linearity and control
(and low residual field when "off", the hysteresis intercept).

google saturation, hysteresis curve, residual - reply back if not satisfied.
 
  • #3
Tido611 said:
I can't find any sort of charts for the stregths of different metals that i could use as the core for my Electro Magnet(EM).

some plans for a E.M. would be kinda cool to see too if anybody has any.

(also, this is my first post on this site and i am really excited because I've been lookin for a quality site like this for a long time. and i know that i will be asking a lot of questions because i still have a lot to learn.
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html
Here is a helpful sight on what you want to know. Hyperphysics is a absolutely splendiferous site, and you will probably be directed to it many times.

And this is what you specifically asked for, a table of relative
permeabilities for various paramagnetic, diamagnetic, and ferromagnetic core materials: http://hyperphysics.phy-astr.gsu.edu/hbase/tables/magprop.html#c2

An iron nail with tightly wrapped magnet wire around it works well as a first electromagnet. And later maybe you can work your way up to an NMR! http://www.cis.rit.edu/htbooks/nmr/chap-7/chap-7.htm#7.2

Before you can start with the construction of an electromagnet, you first need to figure out the following:
1. What will the core be made of
2. What magnetic flux density are you trying to achieve
3. How many turns will be required for this along with
4. How many amps will be flowing through the wire
5. How big will the wire have to be to handle the current
6. How much surface area will you have for cooling the coil
7. How big will the electromagnet be due to the above
8. What voltage rating will the insulation of the wire have to withstand
9. What will be the inductance of the electromagnet
10. Obtain the core, wire, bobbin (form for the winding)
11. Wind the coil
12. Test the electromagnet

Or you could just do it, and test the strength.

http://search.ebay.com/search/searc...s/&fkr=1&from=R8&satitle=Neodymium&category0=
Neodymium magnets are worth the money, I have 25 in my bedroom and they are awesome. You can easily amaze your friends, family, and yourself over and over again. But with power comes a price. They shatter easily, and its likely if you drop one more than once it will break up into pieces. It hurts like hell if flesh gets in between two magnets, afterwards there is a bruise. And don't bring them near any sharp objects, what am I saying? Its all in the handbook you get if you buy it.

Wikilinks:
http://en.wikipedia.org/wiki/Electromagnet
http://en.wikipedia.org/wiki/Solenoid

From powerlabs, stuff you'll never do, but its really fun to read about.
http://powerlabs.org/highvoltage.htm
http://powerlabs.org/emguns.htm
 
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  • #4
ok thuis stuff is good and helpful but do any of your guys have or have links for any EMs
 
  • #5
Tido611 said:
ok thuis stuff is good and helpful but do any of your guys have or have links for any EMs

What? I gave you a whole bunch!

http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html
http://www.cis.rit.edu/htbooks/nmr/chap-7/chap-7.htm#7.2
http://en.wikipedia.org/wiki/Electromagnet
http://en.wikipedia.org/wiki/Solenoid
http://powerlabs.org/pssecc.htm
http://powerlabs.org/railgun.htm
http://powerlabs.org/coilguns.htm
http://powerlabs.org/gaussgun.htm
http://powerlabs.org/multistagecg.htm
http://powerlabs.org/coilgun.htm
http://www.popsci.com/popsci/how2/article/0,20967,726301,00.html [Broken]
http://my.execpc.com/~rhoadley/magacem.htm
This handsized magnet can lift 200 pounds!:
http://demoroom.physics.ncsu.edu/html/demos/525.html
http://my.execpc.com/~rhoadley/magdcem.htm
http://my.execpc.com/~rhoadley/magtube.htm
http://my.execpc.com/~rhoadley/magring.htm
http://powerlabs.org/capexperiments.htm

And always STAY SAFE when you're working with more than a few amps. Keep one hand in your pocket at all times when touching something metallic. Electrocution is one of the fastest ways to go, and you don't even see it coming. If you don't die, you end up with terrible burns and/or bruises.

And what do you mean by "links for EMs?"

Links on how they work? actual ones? famous ones? interesting ones?
 
Last edited by a moderator:
  • #6
when i said links i meant how to make em(but not the science behind it, the plans and designs) and maybe some stuff on power sources, both ac and dc.

and thank you very much for the links so far
 

1. What is an electro magnet?

An electro magnet is a type of magnet that is created by passing an electric current through a coil of wire. The current creates a magnetic field that can attract magnetic materials.

2. How does an electro magnet work?

An electro magnet works by using the properties of electricity and magnetism. When an electric current flows through a wire, it creates a magnetic field. By coiling the wire, the magnetic field is strengthened, making the electromagnet stronger.

3. What are some uses of electro magnets?

Electro magnets have many practical applications, such as in motors, generators, speakers, and MRI machines. They are also used in everyday items like doorbells, credit cards, and refrigerators.

4. How can you increase the strength of an electro magnet?

The strength of an electro magnet can be increased by increasing the number of turns in the wire coil, increasing the amount of current flowing through the wire, and using a core made of a highly magnetic material such as iron.

5. Are electro magnets reversible?

Yes, electro magnets are reversible, meaning they can be turned on and off by controlling the flow of electric current. When the current is turned off, the magnetic field disappears, and the magnetism is lost.

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