Hi Finn,Mathematically, because L = V / (di/dt), and from Faraday L = u x n^2 x A (u = permeability, n = turns, A = cross sectional area). As voltage is applied, the current through L1 has a value based on the resistive portion of the winding and the reactance of the winding shared with the core permeability. As voltage is increased, the current in the winding is increased. This causes the core to become a little more saturated. Because the core becomes more saturated with flux than a previous lower current, it's permeability changes. This causes the inductance to change (inductance is directly proportional to the relative permeability). When the current through the winding is large enough to cause 100% core saturation, the core can no longer accept any more flux (our imaginary friend). At that point, the resistive portion of the winding is all that is providing impedance forward, and thus, the inductance drops off.
The reason of core saturation is correct. But more specifically, it is the permeability that is changing due to saturation and this is what causes the inductance to change. Current through the windings, the emf due to current, and how much it permeates the core causes the permeability of the core to change. Change in inductance occurs because the winding and core permeabilities are magnetically linked when current is flowing.
Does that answer the question? Bart Finn Hammer wrote:
Finn Hammer skrev:Bart, I guess it`s time to ask: Why does inductance change with current? Cheers, Finn Hammer _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/teslaWoops, should have been "with input voltage". Cheers, Finn Hammer _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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