Re: [TCML] Inductance of elliptical coil?

[jhowson4@xxxxxxxxxxx]

formula that i just dug out of Google found behind this link 
http://books.google.com/books?id=K3KHi9lIltsC&pg=PR5&lpg=PR5&dq=inductance+of+an+ellipse&source=bl&ots=dMWlK2rqSi&sig=4jGQZWEos9dr_l5cvN5qCEicqb0&hl=en&ei=A4QMTrTcF-He0QHYy7C2Dg&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCgQ6AEwAzgK#v=onepage&q=ellipse&f=false 

L=0.002*l*[log*((2*l)/(A+B))-0.05685] the log is base e 


hope that link actually works, and the formula is helpful to you, i believe thatyou multiply by n turns for a multi turn coil. 

Thanks, 
John "Jay" Howson IV 

----- Original Message -----
From: "Brian Hall" <brianh4242@xxxxxxxxxxx> 
To: tesla@xxxxxxxxxx 
Sent: Thursday, June 30, 2011 7:40:45 AM 
Subject: [TCML] Inductance of elliptical coil? 



I am looking for formulas to calculate the inductance of an elliptical coil, for use as a primary or secondary, in the shape of a flat spiral, or vertical helix, or conical spiral. Google showed me something about elliptigal integrals but I was never that good at calculus (that and 15+ years between being taught calc and not having used it since). 

Does anyone know of such formulas, to determine inductance in henries or microhenries, and would be willing to share? 


---------------------------------- 
Brian Hall 

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