Which Electromagnet Design Works Best?

AI Thread Summary
The discussion focuses on the optimal design for a cylindrical electromagnet using magnet wire and high-iron-content steel. It suggests that the strength of the electromagnet is influenced by the ratio of length to width, with a long, thin design generally preferred for specific applications. However, for lifting heavy weights, a shorter, disk-like shape may be more effective, especially on smooth surfaces. The conversation also touches on the behavior of iron cores, noting that they can retain some magnetism after power is turned off, albeit weaker than when energized. Ultimately, the design choice should align with the intended use of the electromagnet.
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I have magnet wire and I have steel with extremely high iron content. I was just wondering, if I were using the same amount of wire and metal no matter how I built it and I were just making a straight cylindrical electromagnet, what would be the more powerful design? More towards the short and wide cylinder or more of a thin and long cylinder? Or is there some intermediate ratio that works better? If so, are the any suggestions for that general ratio? Or are these dimensions completely unimportant to the power of the magnet?
 
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It depends on what you want to do with it. Usually the long, thin one, but what's your job for it?
 
The strength is going to be proportional to the amount of windings/length, not just the amount of wraps. So if your looking for just a strong confined magnet focus your wraps in the narrowest section just remember you loose strength as you move away and further down your core.
 
I think the shorter more disk like shape is shorter for lifting the most weight but only with smooth surface.
 
is there any gain in useing a bar magnet over normal iron core
as long as you just want magnetic power and due not care about release

BTW what prevents the core from becoming a magnet anyway once the power is off
all be it much weaker then when the power is on
 
I thought an iron core DID become a weak magnet after the power was shut off.
 
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