Loss Computation Method for Litz Cables With Emphasis on Bundle-Level Skin Effect

Gyimóthy, Szabolcs; Kaya, S.; Obara, Daiki; Shimada, M.; Masuda, Mitsuharu; Bilicz, Sándor; Pávó, József; Varga, G

doi:10.1109/tmag.2019.2890969

Cited by 20 publications

(13 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lakhdari, Cheriet and El-Ghoul [29] propose a study to conductive material thickness estimation from the analysis of the skin effect in non-destructive eddy current tests. In [30] a mathematical evaluation is proposed for numerical simulation of the skin effect and its consequences resulting from certain types of wires.…”

Section: A Current Applicationsmentioning

confidence: 99%

Practical Aspects of the Skin Effect in Low Frequencies in Rectangular Conductors

et al. 2021

View full text Add to dashboard Cite

show abstract

Section: A Current Applicationsmentioning

confidence: 99%

Practical Aspects of the Skin Effect in Low Frequencies in Rectangular Conductors

et al. 2021

View full text Add to dashboard Cite

show abstract

“…For example, the central bundle shown in Fig. 2 (d) has neighboring bundles so that the current flows circularly between them [17]. These circulating currents contribute to AC losses.…”

Section: B Circulating Currentsmentioning

confidence: 99%

“…To analyze not only the eddy current losses but also the loss coming from the circulating current, several methods have been proposed [14]- [17]. In [14,15], the circulating current along each strand in a litz wire was obtained by solving the partial element equivalent circuit (PEEC).…”

Section: Introductionmentioning

confidence: 99%

“…However, it is still difficult to deal with litz wires composed of many strands because the zooming model has to be subdivided into fine elements of less than the skin depth. A postprocessing method based on a probabilistic approach has also been proposed in which the circulating current is computed from the magnetic vector potential obtained by the FE analysis [17]. However, this method can only deal with simply structured litz wires, which are composed of a central bundle surrounded by several bundles, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Litz Wire Losses Using Homogenization-Based FEM

Otomo

Igarashi

Sano³

et al. 2021

IEEE Trans. Magn.

View full text Add to dashboard Cite

This paper proposes a novel analysis method for the losses in a litz wire considering the circulating and eddy currents. In the proposed method, the macroscopic complex permeability is introduced to evaluate the eddy current loss owing to the proximity effect. Homogenization-based finite element analysis using the macroscopic complex permeability can effectively compute the proximity effect loss. The loss owing to the circulating currents is evaluated by solving the corresponding circuit equation. It is shown that the eddy current loss is dominant for the solenoidal and spiral coils without magnetic cores because of the uniform magnetic field distribution along the wire. Moreover, the magnetic reactors in which the circulating current loss cannot be ignored are analyzed using the proposed method. It is shown that the losses computed by the proposed method agree well with the measured results.

show abstract

“…It has been observed that due to such structure, litz wires tend to unify the current sharing among the strands and hence, the frequency dependent power losses are reduced [2,3]. However, this happens only up to a specific frequency, after which considerable losses are observed due to the circulating current [4] and the inter-bundle proximity effect [5,6]. The twisting imperfections and inappropriate twisting pitch (length of lay in longitudinal direction of wire bundle) can produce a drastic rise in winding resistance and losses [7].…”

Section: Introductionmentioning

confidence: 99%

Efficient finite element modelling of litz wires in toroidal inductors

Panchal

Lehikoinen

Rasilo

2021

IET Power Electronics

View full text Add to dashboard Cite

Accurate understanding of losses and frequency‐dependent winding parameters have been an important aspect for selecting the right configuration of stranded conductors in power‐electronic inductors. An approach for modelling frequency‐dependent parameters of a winding with twisted wire bundles in toroidal inductors using a multi‐axial sliced finite element (FE) modelling approach is presented here. A 2D magnetodynamic FE problem is solved in several axial and radial slices of the inductor, accounting for the twisted conductor bundles by varying the conductor positions in the slices. Case studies are presented for different levels and pitch lengths of twisting. The approach is validated against 3D FE simulations in the case of 3–4 parallel strands and against measurements in the case of 75, 105 and 125 strands, which would be impossibly heavy for conventional 3D FE tools. The results provide insight into the effect of strand grouping, twisting levels and twisting pitch on the frequency‐dependent resistance of windings.

show abstract

Loss Computation Method for Litz Cables With Emphasis on Bundle-Level Skin Effect

Cited by 20 publications

References 11 publications

Practical Aspects of the Skin Effect in Low Frequencies in Rectangular Conductors

Practical Aspects of the Skin Effect in Low Frequencies in Rectangular Conductors

Analysis of Litz Wire Losses Using Homogenization-Based FEM

Efficient finite element modelling of litz wires in toroidal inductors

Contact Info

Product

Resources

About