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How to model Litz wire (stranded wires) in Altair Feko or Flux?
You would have to model the wires physically, i.e. drawing multiple lines (which will mesh into wires). Depending on the length and number of wires, it could turn out to be computationally expensive.
Note that the mesh length for the wires should be similar to the spacing between the wires. Also note that the wire segments only model axially flowing current. If there are secondary effects such as currents varying across the cross section of the wire, this effect would be ignored.
My understanding is these Litz wires are used at low frequencies. I would recommend that you also post this question in the Flux forum here.
Hi there,
I just answer another similar question to this one; please see below.
There are two reliable approaches I've found for modeling litz wire, depending on your simulation needs:
1. Simplified Method (2D Steady-State AC Magnetic – XY or Axisymmetric)This is the more straightforward option. In this case, you define the litz wire’s cross-section as a coil conductor region and assign its electrical characteristics using the Coil Loss Models menu. While limited to 2D steady-state AC magnetic solvers, it’s effective for many typical use cases.
2. Detailed Method (2D/3D Steady-State AC Magnetic)This approach is more detailed but offers broader applicability, including full 3D simulations. You model the litz wire coil as a solid volume (e.g., a tube-like shape) and then apply the resistance value provided by the manufacturer. You’ll need to request this resistance specification from the supplier directly, as it’s based on their internal design.
As a reference, I’ve attached an excellent document from New England Wire Technologies, which provides a trustworthy method for estimating litz wire resistance. It may serve as a helpful guide when applying this method.
Hope this comment helps!
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