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Memorandum
USC Campus
Columbia SC 29205
March 29, 2008
For
: ELCT 301
From
: Jared Tucker
Email
: [email protected]
Subject
: Inductor Design
______________________________________________________________________
The purpose of this lab was to design a 100μH inductor with a 3A current capability
using a 3F ferrite ceramic core whose operation frequency is 100 kHz. In the prelab, I had
to calculate the wire gauge to withstand the frequency and current specifications. I then
proceeded to calculate the number of turns I would need to achieve an inductance of
100μH. I then calculated the reluctance of the air gap, reluctance of the material as well
as the AC and DC resistance. For all calculations refer to Appendix I. Many of the
calculations came from [1]. Based on calculations (7 and 8), I found the reluctance of the
air gap to be significantly higher than the reluctance of the material, by at least 2 orders
of magnitude. Therefore I was able to neglect the reluctance of the material. Based on
calculations (9,10) I found the AC resistance to be higher than the DC resistance. This
makes sense because in DC steady state, an inductor appears as a short circuit which
means it contains very little resistance. However, in AC, the inductor would have a
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 Spring '08
 Santi
 Magnetism, Alternating Current, Magnetic Field, air gap, ac resistance

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