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Re: LF: more loop inductance

To: [email protected]
Subject: Re: LF: more loop inductance
From: "Brian Rogerson" <[email protected]>
Date: Wed, 03 Apr 2002 19:39:14 +0100
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Hi Rik,

At 10:24 03/04/2002, you wrote:
Having a closer look at the formulas for different loop shapes gives an
indication that there is a correlation between the inductance of a loop and
the ratio of perimeter^2/area.
If this is correct it would allow to get a formula for rectangular loops :

L = 0.4*(A+B)*(ln((A+B)/d)+7.6-0.35*(A+B)^2/(A*B))
where L = loop inductance in uH, A = loop height in m, B = loop length in m
and d = wire diameter in mm
The formula would be valid for loops where B/A does not exceed 6.

Does anyanoe have actualy measured the inductance of a big square loop ? I would be interested to check the measured values against the calculated
ones.

Have just measured my aluminium 6.4m * 6.4m * 45mm field strength
measuring loop and it gives 26.5uH.  I think the formula gives 25.3uH.
Each corner has two triangular reinforcing plates so the perimeter
will be a little shorter than 4*6.4m.

73, Brian
73 Brian     CT1DRP     IN51QD     41 09 58N  08 39 11W
http://homepage.esoterica.pt/~brian



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