![]() ![]() ![]() Numerical techniques seem unavoidable here, although I would be delighted to be taught otherwise. I just tried to sketch out an outline for a derivation for you, but I don't immediately see any hope for an analytical derivation that is also accurate. You only see a significant inductance boost if the flux path is closed entirely (or substantially entirely) by the core (as in, e.g., a toroidal configuration). Even if you were to us a solid iron core, you would find that the inductance would be only a couple of times larger than it is now. You have a huge flux path that goes through air, not the iron core, so the core is doing very little for you. length=74mm (7.4cm) and measures to different currents give me at most L=150 mHy ! even using mu= 200.You won't be able to make this work practically, unfortunately. N=2445 turns over a 20mm (2 cm), external diameter iron pipe (internal 17mm). ![]() If i use that formula the L should be 6.4 Hy (which will be great !), but I made a solenoid with the following characteristics: Yes, I've used that fórmula but it is intented for a solid core, and in my case the core is an iron "pipe" (why?, simply: I have to put batteries inside the core to feed the electronic circuit to generate magneitc pulses). ![]()
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