A recursive methodology for modelling multi-stranded wires with multilevel helix structure

Plumed, Emilio (Universidad de Zaragoza) ; Lope, Ignacio (Universidad de Zaragoza) ; Carretero, Claudio (Universidad de Zaragoza) ; Acero, Jesús (Universidad de Zaragoza)

Resumen: Multi-stranded litz wires are commonly used in magnetic devices for power electronics applications at medium-high frequency range, from several kHz up to hundreds of kHz. For these applications, litz-wire structure favours the uniformity of driven current in the cross-sectional area of conductors, alleviating ac losses (skin and proximity effects) and improving the global efficiency of the application. These features are achieved by means of a special cable arrangement consisting of many isolated fine copper strands twisted together according to the manufacturing process. Often, the manufacturing process involves several twisting steps where bundles of moderate number of strands are successively twisted resulting in intricate cable structures. We present a mathematical description of the trajectories of copper strands with the purpose of obtaining the cable losses by means of Finite Element Analysis (FEA) simulation tools. Moreover, a nomenclature for this multilevel structures is also proposed. Parameters as the number of twisting steps, number of strands, strand diameter or pitch length, are included in this representation, allowing to compare the performance of different manufacturing solutions.

Idioma: Inglés

DOI: 10.1016/j.apm.2020.02.020

Año: 2020

Publicado en: APPLIED MATHEMATICAL MODELLING 83 (2020), 76-89
ISSN: 0307-904X

Factor impacto JCR: 5.129 (2020)

Categ. JCR: MECHANICS rank: 14 / 135 = 0.104 (2020) - Q1 - T1
Categ. JCR: MATHEMATICS, INTERDISCIPLINARY APPLICATIONS rank: 8 / 108 = 0.074 (2020) - Q1 - T1
Categ. JCR: ENGINEERING, MULTIDISCIPLINARY rank: 12 / 91 = 0.132 (2020) - Q1 - T1

Factor impacto SCIMAGO: 1.01 - Modeling and Simulation (Q1) - Applied Mathematics (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/RTC-2017-5965-6
Financiación: info:eu-repo/grantAgreement/ES/MINECO/TEC2016-78358-R

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Física Aplicada (Dpto. Física Aplicada)
Área (Departamento): Área Tecnología Electrónica (Dpto. Ingeniería Electrón.Com.)
Área (Departamento): Área Electromagnetismo (Dpto. Física Aplicada)