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Inductance calculations

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Peter Percival
Guest

Tue Aug 20, 2019 3:45 pm   



Somewhere there must be a formula for the inductance of a hand-wound coil.

Air core, one layer of wire (of given swg) close-wound, diameter of
former (cardboard, probably inside of toilet paper roll), length of
coil,... (what else?), therefore inductance equals ...

default
Guest

Tue Aug 20, 2019 5:45 pm   



On Tue, 20 Aug 2019 15:07:07 +0100, Peter Percival
<peterxpercival_at_hotmail.com> wrote:

Quote:
Somewhere there must be a formula for the inductance of a hand-wound coil.

Air core, one layer of wire (of given swg) close-wound, diameter of
former (cardboard, probably inside of toilet paper roll), length of
coil,... (what else?), therefore inductance equals ...


of course there are. Your google is broken?

BTW single layer solenoid-wound coils usually hit the calculate values
spot-on, it doesn't start to get hairy until you add layers. There's
a formula that takes into consideration the diameter/length ratio too,
but for simple single layer coils try the "Amateur Radio Handbook."

amdx
Guest

Tue Aug 20, 2019 8:45 pm   



On 8/20/2019 9:07 AM, Peter Percival wrote:
Quote:
Somewhere there must be a formula for the inductance of a hand-wound coil.

Air core, one layer of wire (of given swg) close-wound, diameter of
former (cardboard, probably inside of toilet paper roll), length of
coil,... (what else?), therefore inductance equals ...


Yep a dozen.
I have spreadsheeet labeled the Nagaoka Formula that is supposed to be
very accurate. You can search for it, But I think these use his formula,

Quote:
http://www.mogami.com/e/cad/coil-01.html


If you want a deep understanding, with Nagaoka.
> http://mathscinotes.com/wp-content/uploads/2014/04/lundin_Proc_IEEE_1985.pdf

Otherwise, dig into these. Or just the first one.

Quote:
http://crystalradio.net/professorcoyle/professorcoylecyl.shtml

http://electronbunker.ca/eb/InductanceCalc.html


> https://www.translatorscafe.com/unit-converter/ja/calculator/coil-inductance/?D=2&Du=cm&l=1&lu=cm&N=10

use the second on this page.

Quote:


That's enough so you will never know who is correct Smile
I ecpect

The ones I have used is Professor Coyle, and I had a downloaded version,
so haven't tried the online version and electronbunker.

Mikek

Peter Percival
Guest

Tue Aug 20, 2019 10:45 pm   



amdx wrote:
Quote:
On 8/20/2019 9:07 AM, Peter Percival wrote:
Somewhere there must be a formula for the inductance of a hand-wound
coil.

Air core, one layer of wire (of given swg) close-wound, diameter of
former (cardboard, probably inside of toilet paper roll), length of
coil,... (what else?), therefore inductance equals ...

 Yep a dozen.
 I have spreadsheeet labeled the Nagaoka Formula that is supposed to be
very accurate. You can search for it, But I think these use his formula,

http://www.mogami.com/e/cad/coil-01.html


If you want a deep understanding, with Nagaoka.
http://mathscinotes.com/wp-content/uploads/2014/04/lundin_Proc_IEEE_1985.pdf


Otherwise, dig into these. Or just the first one.

http://crystalradio.net/professorcoyle/professorcoylecyl.shtml

http://electronbunker.ca/eb/InductanceCalc.html


https://www.translatorscafe.com/unit-converter/ja/calculator/coil-inductance/?D=2&Du=cm&l=1&lu=cm&N=10


use the second on this page.

http://www.circuits.dk/calculator_single_layer_aircore.htm

http://www.66pacific.com/calculators/coil-inductance-calculator.aspx

https://coil32.net/online-calculators/one-layer-coil-calculator.html

https://hamwaves.com/inductance/en/index.html#input

https://www.qsl.net/in3otd/indcalc.html

https://knowpapa.com/inductance/

 That's enough so you will never know who is correct Smile
I ecpect

The ones I have used is Professor Coyle, and I had a downloaded version,
so haven't tried the online version and electronbunker.

                             Mikek

Ooh, there's lots! Thank you.


amdx
Guest

Tue Aug 20, 2019 11:45 pm   



On 8/20/2019 9:07 AM, Peter Percival wrote:
Quote:
Somewhere there must be a formula for the inductance of a hand-wound coil.

Air core, one layer of wire (of given swg) close-wound, diameter of
former (cardboard, probably inside of toilet paper roll), length of
coil,... (what else?), therefore inductance equals ...


If your getting into crystal radio,
You might find this interesting,
Quote:
http://theradioboard.com/rb/viewforum.php?f=2
and this overwhelming,
http://makearadio.com/crystal/index.php


Mikek

Look165
Guest

Wed Aug 21, 2019 11:45 am   



A first approach :
µ0*N^^2*S/L.
Parasistic elements are uncomputable.


Peter Percival a écrit le 20/08/2019 à 16:07 :
Quote:
Somewhere there must be a formula for the inductance of a hand-wound
coil.

Air core, one layer of wire (of given swg) close-wound, diameter of
former (cardboard, probably inside of toilet paper roll), length of
coil,... (what else?), therefore inductance equals ...


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