FEM EquationMagnetodynamic2D: Difference between revisions

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The magentodynamic 2D equation provides these special settings:
The magentodynamic 2D equation provides these special settings:
* {{PropertyData|Calculate Capacitance Matrix}}: Calculates the capacitance matrix. The matrix contains the the point charges of the mesh knots.
* {{PropertyData|Angular Frequency}}: The harmonic actuation frequency. It only used if {{PropertyData|Is Harmonic}} is set to ''true''.
* {{PropertyData|Calculate Electric Energy}}: Calculates the electric energy.
* {{PropertyData|Calculate Current Density}}: Calculates the current density.
* {{PropertyData|Calculate Electric Field}}: Calculates the electric field.
* {{PropertyData|Calculate Electric Field}}: Calculates the electric field strength.
* {{PropertyData|Calculate Elemental Fields}}: Calculates the electromagnetic fields for every mesh element. This is useful to see discontinuities in meshes.</br> '''Note''': at the moment FreeCAD cannot display these results properly. Therefore it is at the moment of no practical usage.
* {{PropertyData|Calculate Electric Flux}}: Calculates the electric flux.
* {{PropertyData|Is Harmonic}}: If the driving force is harmonically actuated (AC current). If set to ''true'', {{PropertyData|Angular Frequency}} must have a value > 0.
* {{PropertyData|Calculate Surface Charge}}: Calculates the surface charge.
* {{PropertyData|Capacitance Matrix Filename}}: File in which the capacitance matrix is being saved. It is only used if {{PropertyData|Calculate Capacitance Matrix}} is set to ''true''.
* {{PropertyData|Constant Weights}}: If constant weighting for results is used.
* {{PropertyData|Potential Difference}}: Potential difference in Volt for which the capacitance is calculated. It is only used if {{PropertyData|Calculate Capacitance Matrix}} is set to ''false''. Therefore in fact this setting specifies the voltage between the electrodes of a simple capacitor. Note that the given voltage has to be consistent with the potentials defined in the boundary conditions.


==Constraint Information== <!--T:16-->
==Constraint Information== <!--T:16-->

Revision as of 13:36, 7 February 2023

Other languages:

FEM EquationMagnetodynamic2D

Menu location
Solve → Electromagnetic Equations → Magentodynamic2D equation
Workbenches
FEM
Default shortcut
None
Introduced in version
1.0.
See also
FEM Electrostatic equation

This equation perform electrostatic analyses using a 2D version of the Maxwell equations when the unknown is the z-component (or φ-component).

For info about the math of the equation, see the Elmer models manual, section Computation of Magnetic Fields in 2D.

Usage

  1. After adding an Elmer solver as described here, select it in the tree view.
  2. Now either use the toolbar button or the menu Solve → Electromagnetic Equations → Magentodynamic2D equation.
  3. Change the equation's solver settings or the general solver settings if necessary.

Solver Settings

For the general solver settings, see the Elmer solver settings.

The magentodynamic 2D equation provides these special settings:

  • DataAngular Frequency: The harmonic actuation frequency. It only used if DataIs Harmonic is set to true.
  • DataCalculate Current Density: Calculates the current density.
  • DataCalculate Electric Field: Calculates the electric field strength.
  • DataCalculate Elemental Fields: Calculates the electromagnetic fields for every mesh element. This is useful to see discontinuities in meshes.
    Note: at the moment FreeCAD cannot display these results properly. Therefore it is at the moment of no practical usage.
  • DataIs Harmonic: If the driving force is harmonically actuated (AC current). If set to true, DataAngular Frequency must have a value > 0.

Constraint Information

The magentodynamic 2D equation takes the following constraints into account if they are set:

Results

The available results depend on the solver settings. If none of the DataCalculate * settings was set to true, only the electric force density and the electric potential are calculated. Otherwise also the corresponding results will be available.

The possible results are:

  • Electric energy density in
  • Electric field in
  • Electric flux in
  • Electric force density in
  • Potential in
  • Potential loads in