CAE Software【Femtet】Murata Software Co., Ltd.
In Exercise 1, the capacitor with two parallel conductive plates which have the potential difference was analyzed.
In this Exercise, we analyze capacitor with 4 parallel conductive plates which have the potential difference.
The capacitances across the electrodes, the electric field, and the equipotential map are solved.
Unless specified in the list below, the default conditions will be applied.
Item |
Settings |
Analysis Space |
3D |
Model unit |
mm |
Select “Static analysis” as the potential is static.
Item |
Settings |
Solvers |
Electric Field Analysis [Coulomb] |
Analysis Type |
Static analysis |
Material Type |
Dielectric material |
Options |
N/A |
The electric field exists outside the analysis domain. Therefore the open boundary condition below is applied initially.
Tab |
Setting Item |
Settings |
Open Boundary Tab |
Type |
Absorbing boundary |
Order of Absorbing Boundary |
1st degree |
Create 4 sheet bodies for electrodes. Then, specify the voltage on each as boundary condition.
Four sheet bodies are used to imprint the voltage-specified boundary condition.
They are called “imprinting body”.
You don’t need to set the body attribute or the material property on them.
Body Number/Type |
Body Attribute Name |
Material Name |
1/Sheet |
Imprinting body |
|
2/Sheet |
Imprinting body |
|
3/Sheet |
Imprinting body |
|
4/Sheet |
Imprinting body |
|
* Available from the Material DB
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
Electrode1/Face |
Electric |
Electric wall |
Voltage specified, -1[V] |
Electrode2/Face |
Electric |
Electric wall |
Voltage specified, +1[V] |
Electrode3/Face |
Electric |
Electric wall |
Voltage specified, -1[V] |
Electrode4/Face |
Electric |
Electric wall |
Voltage specified, +1[V] |
Outer Boundary Condition * |
Electric |
Open boundary |
|
To set Outer Boundary Condition, go to the [Model] tab
and click [Outer Boundary Condition] .
To view the calculation results, go to the [Results] tab
click [Table] .
The capacitances across Electrode1 and Electrode2 and across Electrode and Electrode4 are higher than others
The vectors of the electric field are shown below.
The electric field is generated between two electrodes.
The gradation contour of the voltage on the YZ section is shown below.
You can visually grasp the distributed voltage in the space around the electrodes.