User Defined Coil Geometry
The User Defined Coil Geometry subnode is available for Coil if the Conductor model of the parent feature is Homogenized multi-turn and the Coil type is set to User defined. Specify in this feature an arbitrary vector field that defines the direction of the wires in the coil. Such field can be an analytic expression or can be computed using, for example, a Curvilinear Coordinates physics.
For domain features, information on the input/output boundaries is necessary to complete the set up of the coil feature. Use the Input and Output subfeatures to this node to select the input/output boundaries of the coils, external boundaries where the vector field representing the wire direction has a nonzero normal component. The selection can be left empty if there are no such boundaries, for example in the case of a closed-loop coil. This operation is necessary in time dependent and frequency domain studies if the Accurate voltage calculation is active in the parent feature.
Coil Geometry
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Enter the Coil current flow ecoil, a vector field representing the local direction of the wires, which can be an analytic expression, or the solution of another physics (for example, Curvilinear Coordinates). The vector field will be normalized by dividing the local field by the volume average of the field norm. This keeps local variations intact, while scaling the average norm to unity.
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Enter the Domain length Ldomain (for domain features) or the Boundary length Lboundary (for boundary features). The SI unit is meters. This value should correspond to the average length of the wires in the coil, before any symmetry correction.
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If the model represents only a part of a geometry obtained from symmetry cuts (for example, a quarter of a circle), use the settings under Symmetry specification to specify appropriate correction factors. Enter the Coil length multiplication factor FL and Coil area multiplication factor FA (dimensionless integer numbers). The actual length of the coil, used to compute the coil voltage and resistance, is then computed as the product FL·Ldomain(or F·Lboundary for boundary features). The cross-section area of the coil is computed as FA·Adomain.