CAE Software【Femtet】Murata Software Co., Ltd.
Example29 Inductor’s Iron Loss
General
-
A coil is wound on a core. The iron loss is analyzed.
-
The core loss, 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.
-
See Exercise 3 regarding the calculation of heating due to the iron loss.
-
In this exercise, the permeability of core material is constant (linear). The effect of magnetic saturation is not taken into account.
Refer to [Exercise 8: Iron Loss of Coil (AC Analysis with B-H Curve Taken into Account)] for the analysis with the magnetic saturation taken into account.
Analysis Space
|
Item |
Settings |
|
Analysis Space |
3D |
|
Model unit |
mm |
Analysis Conditions
|
Item |
Settings |
|
Solvers |
Magnetic Field Analysis [Gauss] |
|
Analysis Type |
Harmonic analysis |
|
Options |
N/A |
The frequency of the current is set to 50[kHz].
|
Tab |
Setting Item |
Settings |
|
Mesh |
Frequency-Dependent Meshing |
Reference frequency: 50×10^3[Hz] Surface Treatment for Conductors: Generate skin meshes |
|
Harmonic analysis |
Frequency |
Sweep Type: Single frequency Frequency: 50×10^3[Hz] |
Model
A coil is wound on a core.
The model is defined by the core (Core) and the loop coil (Coil) are defined.
The loss characteristics are defined in the iron loss table.
Body Attributes and Materials
|
Body Number/Type |
Body Attribute Name |
Material Name |
|
5/Solid |
Coil |
008_Cu * |
|
6/Solid |
Core |
Core |
* Available from the Material DB
The material properties of the core are set up as follows. The loss is defined in the iron loss table.
|
Material Name |
Tab |
Settings |
|||||
|
Core |
Permeability |
Relative Permeability: 3000 |
|||||
|
Conductor wall |
Conductivity Type: Conductor Conductivity: 0.1[S/m] |
||||||
|
Iron loss |
Iron Loss Calculation Type: Iron loss table Frequency: 5×10^4[Hz] [Magnetic flux density-Loss density] Table *
* This is not the actual material’s property. |
Press the Graph button. The following graph will show up.
Body attribute is set up as follows to apply current to the loop coil.
|
Body Attribute Name |
Tab |
Settings |
|
Coil |
Current |
Waveform: AC Current: 0.1[A] Turns: 100[Turns] Direction: Loop Coil/Magnetic Field Direction Direction Vector of Magnetic Field: X=0, Y=0, Z=1 |
Boundary Conditions
No setting.
Results
To see the iron loss, go to the [Results] tab
click [Table] 
.
The joule loss is shown below.
The iron loss is shown below.
The core’s iron loss is approximately 0.9[W].
The joule loss and the hysteresis loss of the core are not given because the the material property is defined on the iron loss table.
The loss characteristics are defined in the iron loss table. Only iron loss is obtained.
If it is defined by the iron loss experimental formula, the joule loss and the hysteresis loss are output as well.
See [Loss Calculation in the Magnetic Field Analysis] for details of the loss.
The vectors of the magnetic field are shown below.
The vectors of the magnetic flux density are shown below.
The flux density is looping through the core.
The vectors of the current density are shown below.
The iron loss density is shown below.
