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prady
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Join Date: Dec 2009
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strength of an electromagnet

01/16/2010 11:00 AM

They say that the strength of the magnetic field possible from an iron core electromagnet is limited to 1.6-2 T, is this limitation holds for an electromagnet with any number of turns ??? (is number of turns is a factor) and another question is, which core practically seems to be best???

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redfred
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#1

Re: strength of an electromagnet

01/16/2010 11:44 AM

From how you've phrased your question, you can possibly and likely will get a collection of confusing answers. Recently this was discussed at Ways to Increase a Solenoid Magnetic Field. To give you a synopsis pertaining to your question, the number of turns will not matter. The iron core will still saturate at the same magnetic field, but less current will be required to saturate at this level. If you can successfully drive much more current without melting wires you can get higher magnetic fields. But this will happen at current levels as if no core material exists inside the solenoid. There are exotic materials that can permit a slightly higher magnetic field but to make an electromagnet, an Iron core by far is the most economical and practical.

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kvsridhar
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#2

Re: strength of an electromagnet

01/17/2010 12:54 AM

Maybe what i am saying is known to you already, if so, my apologies.

Tesla is flux density. Most ferrous materials saturate at this level, true. But the actual flux in webers is the (flux density x pole face area), and the force exerted by a magnet is proportional to Flux X (flux density) ie .. B^2*A/2 mu(zero). So one can make a powerful electromagnet keeping the B < 1.5 T and a large pole face area (and of course, the complete magnetic path)

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Snave
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#3

Re: strength of an electromagnet

01/19/2010 11:57 AM

Responses 1 & 2 concisely answered your question about magnetic strength. But beyond that you must have an application or reason for asking the question. The following link has a good discussion on changing the torque force curve by shaping the end of an armature. It might be useful in your application.

http://www.sal.wisc.edu/PFIS/docs/rss-vis/archive/public/Product%20Manuals/bicron/soldesop.pdf
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kvsridhar
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#4
In reply to #3

Re: strength of an electromagnet

01/19/2010 10:15 PM

Thank you Snave, an excellent site. On the fun side, you may try many coilgun sites, one of which is here .. educative too.

http://www.coilgun.info/about/home.htm

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