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Anonymous Poster

Calculating the Micro Henry

05/27/2010 2:37 PM

please help me to calculate the micro Henry of my induction coil.my coil diameter is 12" and length is 4.5"

thanks

subhajit
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user-deleted-1105
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Popular Science - Weaponology - New Member United Kingdom - Member - New Member

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#1

Re: calculate the micro henry

05/27/2010 2:51 PM

We'll need to know the number of turnscore material etc.
An inductance meter is relatively cheap these days.
I just checked, there are several new for about £5 on E-bay.
(Ok I don't s'pose you are in the UK...)
Del

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kvsridhar
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#2

Re: Calculating the Micro Henry

05/27/2010 9:14 PM

For an air-cored coil, you can use Wheeler's formula :

L(mH)=0.8*a^2*n^2/(6a+9b+10c)

where:

L = inductance in mH
a = avg radius of coil,mm
b = length of coil,mm
c = diff between inner and outer radii,mm
n = number of turns
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