When the flux density and ferromagnetic materials will be in the business data catalog as plus or minus delta Bac with AC component between changes in the DC bias magnetic field, the location of the point of BH Hdc, depends on the magnetic field strength and the intensity of magnetic field depends on Hdc DCcurrent.
Applied field will change according to the fluctuation of alternating current, and applying field will change as in Hdc + delta between d.
This will cause a small hysteresis loop around the working point.
Soft magnetic alloy if the operating point may lead to material saturated close to the material.
With the same material but different magnetic permeability of inductor will get different slope but saturated, the same as a result, if the introduction of the air gap, the flux density will not change.
Eddy current and resistance loss of the eddy current will affect both core and winding resistance loss.
Eddy current is induced current in magnetic core inherited from the magnetic flux around the conductor.
The current will be at the core, can be achieved by using magnetic core material with high resistance to reduce magnetic core material, thus reducing the induced current in.
Also can produce eddy current in the conductor.
These can be seen as a resistance flow power loss.
The total resistance loss from dc resistance and ac resistance, Pdc including dc loss and can be expressed as Pdc = RdcI2 RMS.
Inductance of different types of Rdc is dc resistance, Irms is the RMS current dc.
Ac resistance large complex, it depends on the conductor skin effect and proximity effect, both the frequency is higher, the better.
Skin effect can lead to current in the conductor shrinkage, because the current is pushed away from the middle of the inductor.
This is because a alternating magnetic field around a current in the conductor.
When the current changes, the magnetic field will produce contrary to current strength of the electric field.
The electric field in the conductor, so current is pushed to the edge.
The thickness of the conductor when choosing a size, it is important to know the skin.