General
Home / Examples / Magnetic Analysis (Gauss, Static Analysis/Harmonic analysis) / Example 12: Inductances of Two United Helical Coils
Two helical coils that are coupled magnetically are studied.
The coupling coefficient, 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.
Item |
Settings |
Analysis Space |
3D |
Model Unit |
mm |
Item |
Settings |
Solver |
Magnetic Analysis [Gauss] |
Analysis Type |
Static Analysis |
Options |
N/A |
Set the Mesh Tab as follows.
Tab |
Setting Item |
Settings |
Mesh |
Meshing Setup |
Automatically set the general mesh size: Deselect General Mesh Size: 2 [mm] |
Two helical solid body coils (Coil1, Coil2) are defined.
Body Number/Type |
Body Attribute Name |
Material Name |
0/Solid |
Coil |
008_Cu * |
3/Solid |
Coil2 |
008_Cu * |
* Available from the material DB
Body attribute is set up as follows to apply current to the coil.
Body Attribute Name |
Tab |
Settings |
Coil |
Current |
Waveform: Constant Current: 1 [A] Turns: 1 [Turns] Direction: Specify Inflow/Outflow faces (In the Air Box): Select inflow face and outflow face. |
Coli2 |
Current |
Waveform: Constant Current: 1 [A] Turns: 1 [Turns] Direction: Specify Inflow/Outflow faces (In the Air Box): Select inflow face and outflow face. |
No setting.
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 vectors of the magnetic field on YZ plane are shown below.
The strong magnetic field is generated inside coils in the negative Z direction.
The vectors of the current density are shown below.
The current is flowing as set for the coil.