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What core design of an electromagnet will maximize field at more distance 
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#19
Feb1013, 11:00 AM

P: 71

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 


#20
Feb1013, 02:17 PM

P: 9

Graniar, thank you. Nice focusing of the field!



#21
Feb1013, 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?



#22
Feb1013, 02:38 PM

P: 71




#23
Feb1013, 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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