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In powder cores, why is actual inductance different from calculated?

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In powder cores, why is actual inductance different from calculated?

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Magnetics measures inductance in a Kelsall Permeameter Cup. Actual wound inductance outside a Kelsall Cup is greater than the value calculated due to leakage flux and flux developed in the winding. The difference depends on the core size, permeability, core finish thickness, wire size, and number of turns, in addition to the way windings are put on the core. The difference is negligible for 125µ and higher and turns greater than 500. The following table is a guide to the differences that one might experience: No. of Turns Actual L No. of Turns Actual L 100 0% 100 +3.0% 500 +0.5% 50 +5.0% 300 +1.0% 25 +8.5% The following formula can be used to approximate the leakage flux to add the expected inductance. This formula was developed from historical data of cores tested at Magnetics. Be aware that this will only give an approximation based on evenly spaced windings. You might expect as much as ± 50% deviation from this result.

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