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4hv.org :: Forums :: Tesla Coils
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mathematically calculating k

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Ben Solon
Wed Oct 24 2012, 08:41PM Print
Ben Solon Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
 		does anyone know how to calculate the k of two coils(pri and sec) if they have weird dimensions? all i've found are formulas for two solenoids of the same radius. i need to do are two helical coils(maybe one angled helix) of different diameters. all i need are formula's. thanks.
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Dr. Brownout
Wed Oct 24 2012, 10:10PM
Dr. Brownout Registered Member #2405 Joined: Fri Oct 02 2009, 12:59AM
Location: Wisconsin
Posts: 140
 		Have you checked this
Link2

Not sure if its what your looking for but at least it gives you a starting point.
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Ben Solon
Wed Oct 24 2012, 11:10PM
Ben Solon Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
 		No, I've found plenty of these types of sites. i'm trying to calculate the k. no measurements other than dimensions. the main problem is that no formula I've found so far factors in coil positions relative to each other and coils with different dimensions.
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Hazmatt_(The Underdog)
Thu Oct 25 2012, 12:40AM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
 		you'll need some books. I was interested in this too, but I haven't had much time to read.

Terman, Radio Engineering Handbook
Welsby, The Theory and design of inductance coils
Grover, inductance calculations

and theres probably a few more out there
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Ben Solon
Thu Oct 25 2012, 01:00AM
Ben Solon Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
 		Thanks! Guess I'll have to get some of those on amazon or something. I'm really surprised that there's nothing around the internet for this sort of thing. Sure there's javatc, but no equations. I even tried going through javatc's source to get at the javascript functions, but they're located elsewhere.
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Newton Brawn
Thu Oct 25 2012, 03:39AM
Newton Brawn Registered Member #3343 Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
 		Ben:

Try these :

Inca (ICCDTR) program

Installation - The program works in a PC under Windows.
Just copy the files Inca.exe and inca.xpl to the same directory.


available at Link2

Author : Antonio Carlos M. de Queiroz - 21/12/2003

regards
Newton
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dex
Thu Oct 25 2012, 09:29AM
dex Registered Member #2566 Joined: Wed Dec 23 2009, 05:52PM
Location:
Posts: 147
 		IMHO,there are no closed formulae taking in account all parameters of the geometry between two coils.To calculate mutual inductance precisely enough,you must use numerical methods.
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Steve Conner
Thu Oct 25 2012, 09:39AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		Yes, you can use FANTC and maybe JavaTC too.
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Ben Solon
Thu Oct 25 2012, 11:32PM
Ben Solon Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
 		but what are the driving calculations behind javatc and inca?(just need the formula for a code function on a uC) it can obviously be done because these programs exist, but it seems the equations are missing from everywhere.
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dex
Fri Oct 26 2012, 06:59AM
dex Registered Member #2566 Joined: Wed Dec 23 2009, 05:52PM
Location:
Posts: 147
ben123324 wrote ...

but what are the driving calculations behind javatc and inca?(just need the formula for a code function on a uC) it can obviously be done because these programs exist, but it seems the equations are missing from everywhere.


i guess they are based on systems of elliptic integrals and various equivalent threatments of them.
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