![]() ![]() More permeability means a stronger field will be induced within the implant. Magnetic permeability is the mu variable you often see in formulas relating to coils. There’s three factors affecting your choice: permeability, coercivity, availability Wanted to share my answer here for others. In a PM you asked if you would be better served by a raw iron or soft ferrite core. 500" long.ĭistinctly weird when you start getting round numbers like that, but there it is. 11074" and will fit in a 2.8128mm id tube, call it 3mm)Ĭoil length of (125 turns per layer *.004 wire dia.). In the absence of a better idea, I’ll set the loop dia to the middle of the layers of the coil. To get it on the rod, I’d need at least 4 layers, but the online calculator doesn’t do that and I can’t find a better one. Unfortunately, that gives a coil length (548turns *. ![]() ![]() Numbers for air core are too huge to deal with.ĭecided to try ferrite core, see if it would push it into a workable range. ![]()
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