Home / Examples / Electric Analysis [Coulomb] / Example 1: Parallel-Plate Air-Gap Capacitor

Example 1: Parallel-Plate Air-Gap Capacitor

The capacitor analyzed in this example consists of two parallel conductive plates which have the electric potential difference.
The capacitance, the electric field, and the equipotential map are solved.
Unless specified in the list below, the default conditions will be applied.

Select "Static analysis" as the electric potential is static.

Item	Settings
Solver	Electric Analysis [Coulomb]
Analysis Type	Static Analysis (Capacitance)
Options	N/A

In actuality, the electric field exists outside the analysis domain. Therefore the open boundary condition below is applied initially.

Create 2 sheet bodies for electrodes. Then, specify the electric potential on each as boundary condition.

Two sheet bodies are used to imprint the electric potential-specified boundary condition.

They are called "imprinting body".

You don't need to set the body attribute or the material property on them.

* Available from the material DB

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
Electrode1/Face	Electric	Electric Wall	Electric Potential Specified -1 [V]
Electrode2/Face	Electric	Electric Wall	Electric Potential 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 see the calculation results, go to the [Results] tab

and click [Table] .

The vectors of the electric field are shown below.

The electric field is generated between two plates.

The gradation contour of the electric potential on the XZ cross section is shown below.

You can visually grasp the distributed electric potential in the space around the electrodes.