And if you want to do a first-order correction for fringing, replace the length with [length + 0.9*radius]. This correction is important if the coil length is not very much greater than the radius. Harold Wheeler gave us this correction back in the 1920s. I find that the inductance calculated this way rarely deviates from measurements by more than a couple of percent for most practical coils, so Wheeler's is a very effective correction.
--Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
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On 11/25/2024 3:20 AM, Renaud F5ZR via groups.io wrote:
Hi Jinxie,
Back to the fundamentals!
L=n2.mu.S/l
With mu=1.26.10-6 as your inductor is on air?
S in sq meters
l in meters
