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Home / Examples / Magnetic Analysis (Gauss, Static Analysis/Harmonic analysis) / Example 19: Inductance of Nonlinear Material (B-H Curve)
Example 19: Inductance of Nonlinear Material (B-H Curve)
General
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Inductance of a core of nonlinear material (permeability is defined with B-H curve) is solved.
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The vectors of the magnetic field and the magnetic flux density are solved.
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Unless specified in the list below, the default conditions will be applied.
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Obtain this session's project file. (Right-click and choose 'Save link as')
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Results will vary depending on Femtet version and the PC environment.
Analysis Space
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Item |
Settings |
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Analysis Space |
3D |
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Model Unit |
mm |
Analysis Conditions
Depending on the calculation type of inductance, different inductance value will be acquired.
See [Calculation Type of Inductance] for details.
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Item |
Settings |
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Solver |
Magnetic Analysis [Gauss] |
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Analysis Type |
Static Analysis |
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Options |
Calculation type of inductance: Apparent Inductance |
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
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Body Number/Type |
Body Attribute Name |
Material Name |
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9/Solid |
Coil |
008_Cu * |
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8/Solid |
Core |
Core |
* Available from the material DB
Material property of the core is defined with B-H curve table.
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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 "
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Material Name |
Tab |
Settings |
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Core |
Permeability |
Magnetization Characteristic Type: Select [B-H curve]
B-H Curve Table
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Press the Graph button. The following graph will show up.
Body attribute is set up as follows to apply current to the loop coil.
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Body Attribute Name |
Tab |
Settings |
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Coil |
Current |
Waveform: Constant Current: 2 [A] Turns: 100 [Turns] Direction: Loop Coil/Magnetic Field Direction Magnetic Field Vector: X=0, Y=0, Z=1 |
Boundary Conditions
No setting.
Results
To see the results of inductance calculation, go to the [Results] tab
and click [Show Numerical Summary Table] 
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The vectors of the magnetic flux density are shown below.
The section at XZ plane.
