Optimal electromagnet bobbin material

AI Thread Summary
The discussion focuses on selecting optimal materials for electromagnet bobbins and end caps. Steel washers are considered for their strength, but concerns arise about their impact on the electromagnetic field and potential residual magnetism after current cessation. Alternatively, nylon washers are proposed as a non-magnetic option, which could be attached with industrial epoxy to avoid interference with the EM field. Participants are encouraged to share insights on the implications of using these materials in electromagnet design. The conversation highlights the importance of material choice in achieving effective electromagnet performance.
jlknauff
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I can't seem to find any answers on this...I'm experimenting with some electromagnet designs, but I'm not sure what the best bobbin, or end caps would be. I was thinking about using steel washers welded to the iron core since it would be the strongest, but I thought that may affect the EM field. The other option was to use nylon washers attached to the iron core using a special industrial epoxy because it would have no effect on the EM field.

Any thoughts on this?
 
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Wouldn't a steel washer remain magnetised after the current is switched off?
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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