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Inductor Tech MEmo - Page 1 of 3 Memorandum For ELCT 301...

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Page 1 of 3 Memorandum October 12, 2011 For : ELCT 301 From : Meredith Thomas Email : [email protected] Subject : Inductor Design ______________________________________________________________________ The purpose of this lab was to design a 100μH inductor with a 3A current capability using an EFD 30 ferrite ceramic core material for operation frequency at 100 kHz. The maximum flux density used is 0.25T. For the prelab, I had to calculate the wire gauge to withstand the frequency and current specifications. I then calculated the number of turns I would need to achieve an inductance of 100μH. Next, I calculated the reluctance of the air gap as well as the reluctance of the material. Finally, I was to measure the AC and DC resistance of the inductor at 100 kHz and 1 MHz (See Appendix for all calculations). Equation (1) of the Appendix was used to calculate most of these values. Using Equations (7) and (8), I found the reluctance of the air gap to be significantly higher than the reluctance of the material, by about 2 orders of magnitude. Therefore I was able to neglect the reluctance of the material. I found the AC resistance to be higher than the DC
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