Advanced modeling of Litz wire using finite element method

Abstract

The integration of Litz wire into electric component designs marks a significant breakthrough in mitigating copper losses and improving device efficiency, particularly in high-frequency applications where traditional conductors struggle. Litz wire complex arrangement of individually insulated strands effectively reduces the skin and proximity effects, resulting in a more even distribution of current and a substantial mitigation in resistive losses. However, modeling and simulating Litz wire configurations present unique computational challenges. While traditional analytical methods offer speed and accuracy in certain cases, they often require adaptation and are limited to specific scenarios. Consequently, there is a growing shift towards numerical techniques to address these complexities effectively. This thesis aims to explore the nuanced applications of Litz wire and introduce a novel numerical technique for modeling Litz wire coils, enabling efficient computation of winding AC losses and related quantities. By leveraging advanced numerical methods, this approach overcomes the longstanding challenges associated with intricate Litz wire scenarios, facilitating comprehensive analyses and design optimizations for electric systems. In addition to an introduction and conclusion, this thesis is structured into four chapters: a literature review, an examination of power loss phenomena in electric devices, an exploration of analytical techniques and Finite Element Method (FEM) solutions for analyzing winding losses, and finally, the introduction of a novel finite element modeling approach for simulating Litz wire conductors. Through these investigations, the thesis aims to contribute to advancing the efficiency and reliability of electric systems in the era of electrification, addressing critical challenges in high-frequency applications and enhancing the sustainability of electric component designs.

Date	27 Jun 2024
Original language	American English
Awarding Institution	École de technologie supérieure
Supervisor	Handy Fortin Blanchette (Supervisor) & Vincent Demers (Co-supervisor)