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inductance
Hello everybody, I am (again) coming with small
problem.
It is about inductance. I am callculating inductance
of a coil.
1. one turn
2. four turns.
In case (1) I use formula L= (mi0/pi)*(1/4 + ln(D/r0)
where is: mi0=4*pi*e-7
D- diameter of coil ( like this: 0-----D----0, where 0
is
conductor and D is space between them)
r0= radius of conductor
I know this is formula for two paralell conductors and
inductance
between them but with some assumptions it can work.
so in this case, r0=0.05m, D=0.8m,I+ = 1A, I-=-1A,
my callculations give 1.2 e-6 H/m, FEMM 1.16 e-6 H/m,
so it is ok.
I used AJ block integral (A j dV/2 = energy)
BUT, if I take four turns of wire, inductance should
be 16 times
higher because inductance of coil rises with n^2.
(n = number of turns)
I can not achieve acceptable solution.
*.fem file is attached.
plase help
thanks
tomislav.
P.s. (to david) nearly done with translation.
how to create *.pdf?
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