What core design of an electromagnet will maximize field at more distance


by dlbeeson
Tags: core, design, distance, electromagnet, field, maximize
Graniar
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#19
Feb10-13, 11:00 AM
P: 71
Quote Quote by sophiecentaur View Post
A wide array of charges, antennae, masses and magnetic poles will give a more even spread of field locally - which is what the OP was after, afaics. A good wide one beats a good narrow one any day.
Ok, for local fields configuration is a point. But what is an optimal configuration if the goal is to get maximum strength at the point?

I think this one, where point is surrounded with properly oriented elementary magnets. Due to cubic decreasing of field, there is a logarithmic dependence of multiplication achievable to outer/inner radius of such a sphere
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dlbeeson
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#20
Feb10-13, 02:17 PM
P: 9
Graniar, thank you. Nice focusing of the field!
dlbeeson
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#21
Feb10-13, 02:21 PM
P: 9
Graniar, so back to the original question, in an electromagnet, what core design will send the field out farther in 1 direction or axis? A long cylindrical core? A short fat cylindrical core with a pancake coil winding? A Cone shaped core with the point toward the washer to be picked up? What do you think?
Graniar
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#22
Feb10-13, 02:38 PM
P: 71
Quote Quote by dlbeeson View Post
Graniar, so back to the original question, in an electromagnet, what core design will send the field out farther in 1 direction or axis?
That design, where all domains will be oriented parallel to that axis, and it's definetly not a cone. Form is not a big deal (If only allow some parts of it to be a bit closer to the target) Remind of the cubic decrease in distance. 10 times farther means 1000 times weaker.
Graniar
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#23
Feb10-13, 02:45 PM
P: 71
By the way, scaling would work well. If IE 1sm magnet generates some field on a 10sm distance. Huge 1m magnet of same form would generate field of same strength on a 10m distance


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