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Example 19: Inductance of Nonlinear Material (B-H Curve)

General

• Inductance of a core of nonlinear material (permeability is defined with B-H curve) is solved.
   

• The vectors of the magnetic field and the magnetic flux density are solved.
   

• Unless specified in the list below, the default conditions will be applied.
   




• Results will vary depending on Femtet version and the PC environment.

Analysis Space

Analysis Conditions

Depending on the calculation type of inductance, different inductance value will be acquired.

See [Calculation Type of Inductance] for details.

Model

A loop coil (coil) and a magnetic core (core) with gap are placed.

As the magnetic field concentrates in the gap of the magnetic core, small mesh size is applied (0.2mm).

Body Attributes and Materials

* Available from the material DB

Material property of the core is defined with B-H curve table.

• If the magnetization characteristic is defined by B-H curve or M-H curve, calculation is nonlinear. Nonlinear calculation may not converge.
  In such case, refer to "If the Nonlinear Calculation (B-H Curve) Does Not Converge "

Press the Graph button. The following graph will show up.

Body attribute is set up as follows to apply current to the loop coil.

Boundary Conditions

No setting.

Results

To see the results of inductance calculation, go to the [Results] tab

 and click [Table] .

The vectors of the magnetic flux density are shown below.

The section at XZ plane.