A Fast 3D Numerical Impedance Calculation for Litz Wire and Air-Core Coils
T. Luo (TU Delft - High Voltage Technology Group)
M. Ghaffarian Niasar (TU Delft - High Voltage Technology Group)
Peter Vaessen (KEMA Laboratories, TU Delft - High Voltage Technology Group)
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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.