Fast 2.5D Loss Calculation for round Litz Wires
T. Luo (TU Delft - High Voltage Technology Group)
Mohamad Niasar (TU Delft - High Voltage Technology Group)
P. Vaessen (TU Delft - High Voltage Technology Group, KEMA Laboratories)
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Abstract
Litz wire, which is used to suppress eddy current, always have complex structure. Solving its 3-D finite element model (FEM) requires high computational resources. This article presents a 2.5-D loss calculation method for round Litz wires, which do not need mesh. One pitch of Litz wire is set as an object. The exact structure is constructed by a recursive method and then is sliced into several sections per pitch. Each section is represented by a cross section area. Two-dimensional problems are solved based on an analytical method, which is based on magnetic vector potentials in quasi magneto-statics situation. One pitch of the Litz wire is approximately represented by the summation of 2-D problems. The proposed method is compared with 3-D FEM results, which shows the proposed method has good accuracy and fast computational speed.