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Nonlinear Inductance with RM8LP Core

Figure 5.1 shows a crosssection of a RM8LP core. The air gap at the centerpost has a step and cause a nonlinear behavior of the inductance as a function of the current.
Figure 5.1 flux density at I = 8 A
The curve can be interpreted as incremental inductance. The inductance is defined by adding a small AC current to a certain DC current. In the calculated curve (fig. 5.2) you can see that in the beginning the inductance is very high due to the small airgap in the right of the centerpost. But already at low currents this area is saturated and the inductance decrease to about 25 µH. At I = 8A the centerpost is saturated completely. The inductance curve has an second ‚step'.