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The Single conductor option models a single, solid region of a conducting material (for example, metal) in which the current flows. The lumped voltage and current of the coil correspond, respectively, to the integral of the electric field along the coil length and to the integral of the current density on a cross section. Use this option in a domain feature to model a single wire with a nonnegligible cross section; in a boundary feature it can be used for a thin conductive layer whose thickness is negligible (for example, in frequency domain, it is small with respect to the skin depth).
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The Homogenized multiturn option implements a homogenized model of a coil consisting of numerous tightly-wound conducting wires, separated by an electrical insulator. The computation of the voltage and current of the coil is performed in a similar way as for the Single conductor model, but it also takes into account parameters such as the number of wires and the cross-section area. Use this feature to model a coil containing a large number of wires without the need to model each wire individually. The boundary feature can be used when the wires are arranged in a thin region whose thickness is negligible. Note that capacitive coupling and skin effect are neglected in the homogenized model.
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For examples of a Single conductor Coil, see:
For examples of a Homogenized multiturn Coil see:
Inductor in an Amplifier Circuit: Application Library path ACDC_Module/Electromagnetics_and_Circuits/inductor_in_circuit
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When using the Single conductor option, the coil models a solid conductive domain (typically a metal). The material properties of the metal (electric permitting, magnetic permeability, and electrical conductivity) should be used in this case.
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When using the Homogenized multiturn option, the conduction current (induced current) is assumed to flow only in the wires. To prevent induced current density from flowing in the domain, the region’s electrical conductivity σ is set to zero. The material used in the domain, only specifies the constitutive relations for the electric displacement field and the magnetic flux density. Therefore, choose or create a material that provides constitutive relations representative of the entire coil domain, not just of the material making up the metallic wires.
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The RLC Coil Group feature, that models coils for which capacitive effects between coil turns and with other parts of the models are comparable with the inductive effects.
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The Single Conductor Coil feature, to introduce an externally applied current or voltage on domains where the Ampère’s Law and Current Conservation feature is active. This feature is contributing, that is, it simply adds an external current density to the domain model represented by Ampère’s Law and Current Conservation.
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