A Fast 3D Numerical Impedance Calculation for Litz Wire and Air-Core Coils

Luo, Tianming; Niasar, M.; Vaessen, P.T.M.

A Fast 3D Numerical Impedance Calculation for Litz Wire and Air-Core Coils

Journal article (2024)

Authors

Tianming Luo High Voltage Technology Group

M. Niasar High Voltage Technology Group

P.T.M. Vaessen KEMA Laboratories, High Voltage Technology Group

Research Group

High Voltage Technology Group

Eddy current Proximity effect Skin effect Copper losses Air-core coil Litz wire

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Published Date

2024

Language

English

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Research Group

High Voltage Technology Group

Abstract

This article presents a 3-D numerical impedance calculation method based on cylindrical elements. It can be used to model the Litz wire and further air-core coil wound by the Litz wire. The discretization is based on cylindrical elements, resulting in a small amount of elements. Cylindrical element analysis is based on a 2-D analysis and its analog to 3-D. The analysis considers both transverse and longitudinal magnetic fields applied to elements. The proposed method is applied to several Litz wires and compared with 3-D finite element method (FEM), which validates that the method has good accuracy and fast computational speed. The effectiveness of the method for the air-core coil is validated by measurements. The proposed method is promising in facilitating coil optimization.

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