Simulation of electric and magnetic fields using FEMM - FH Aachen ...
Simulation of electric and magnetic fields using FEMM - FH Aachen ...
Simulation of electric and magnetic fields using FEMM - FH Aachen ...
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3.1.5 Add material properties<br />
“Properties”→“Materials Library”<br />
Figure 3-5 Material Library<br />
Find the material we need in this library <strong>and</strong> drag it to the “Model Materials” box. Here we<br />
need copper 16 AWG, which is under “Copper AWG Magnet Wire”, Pure Iron under “S<strong>of</strong>t<br />
<strong>magnetic</strong> material”. And also we need material Air.<br />
3.1.6 Define boundary<br />
Select “Properties”→“Boundary” from the main menu , then click on the “Add Property”<br />
button. Rename the boundary to “A=0”<strong>and</strong> Select type to “Prescribed A”, which means here<br />
we selected Dirichlet to be the boundary condition. Fill all the values with 0. Then click on<br />
“OK”.<br />
(There are 5 boundary conditions for <strong>magnetic</strong> problems:<br />
Dirichlet. In this type <strong>of</strong> boundary condition, the value <strong>of</strong> potential A or V is explicitly defined on the<br />
boundary.<br />
Neumann. This boundary condition specifies the normal derivative <strong>of</strong> potential along the boundary.<br />
Robin. The Robin boundary condition is sort <strong>of</strong> a mix between Dirichlet <strong>and</strong> Neumann, prescribing a<br />
relationship between the value <strong>of</strong> A <strong>and</strong> its normal derivative at the boundary.<br />
Periodic.A periodic boundary conditions joins two boundaries together. In this type <strong>of</strong> boundary<br />
condition, the boundary values on corresponding points <strong>of</strong> the two boundaries are set equal to one<br />
another.<br />
Antiperiodic. The antiperiodic boundary condition also joins together two boundaries. However, the<br />
boundary values are made to be <strong>of</strong> equal magnitude but opposite sign.)