Layman needs help finding the right material...
Layman needs help finding the right material...
(OP)
hello all, hopefully you can help me. i'm wanting to wind some small electromagnet coils. the coil cores are .375" in diameter. i need a really soft steel as well low carbon content. will it be hard for me to find 1008 rod? should i then have the rod annealed? basically, i would like to know the most available type of steel that is closest to what i need and where i could find it. any help is greatly appreciated. if you need more info to understand what i need let me know. thanks!





RE: Layman needs help finding the right material...
In either case, yes you should Hydrogen anneal after the cores are cut and/or formed.
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Corrosion never sleeps, but it can be managed.
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RE: Layman needs help finding the right material...
RE: Layman needs help finding the right material...
For 60 Hz AC, silicon steel is used to increase the resistance to eddy currents. The core is built up from thin sheets also to minimize eddy current losses. The laminations must be electrically insulated from each other usually by converting the lamination surfaces to black iron oxide. Search for Tempel steel.
RE: Layman needs help finding the right material...
If this is DC, and switching speed isn't important, then any low carbon steel that has been annealed should be fine. Stay away from free machining grades.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Layman needs help finding the right material...
RE: Layman needs help finding the right material...
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The lower the impurities in steel, the higher the magnetic flux can go before saturation. To reduce the eddy current iron losses (heat), however, you would be much better off using laminated silcon steel. A softer button made from your choice could be attached to the end for the "softness" you require.
RE: Layman needs help finding the right material...
The laminations dont need to be special electrical steel in order to help. If you want to make one on the cheep and see how it works get a chunk of a junk refrigerator. Then you are going to need a way to punch your 3/8" diameter discs, with a small hole in the center.
The stack will need to be very tightly compressed, no gaps allowed. You may need to even remove the burrs from the edges and center hole in order to get them to stack tightly. You would porbably want to press the stack tight before you fasten it.
One more thought, instead of using masking tape try to find some mylar or Kapton tape. I have some Kapton film (no adhesive). They are much stronger and will resist wear better.
It would also help (reduce noise, increase life, improve cooling) if you glued the windings together. An epoxy would be a good choice. Coat the core with a thin layer and start winding. Add a thin layer of adhesive over each layer of windings. Make sure that it is all cured before you power it.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Layman needs help finding the right material...