Frequency Dependence Deterioration of AC Resistance in Large-Diameter Litz Wire for High Power Induction Heating

研究成果

1 被引用数 (Scopus)

抄録

This paper reports the frequency dependence deterioration of the ac resistance found in Litz wires for high power applications. Litz wire is widely utilized for heating coils of the induction heaters as a wire with small ac resistance at high frequency. Particularly, the recent spread of next-generation switching devices resulted in high-frequency operation of high-power induction heaters, which increasingly adopt Litz wire with a large diameter for copper loss reduction. However, little knowledge has been reported on the effect of the Litz wire diameter on the frequency dependence of the ac resistance, which will be important for the design of Litz wire for high power applications. To elucidate the effect, this paper experimentally measured and compared the frequency dependence of the ac resistance among the Litz wires with different diameters. The result revealed that the Litz wire with a large diameter exhibits worse frequency dependence of the ac resistance than that with a small diameter. In other words, the Litz wire with a large diameter increased ratio of the ac resistance to the dc resistance at a lower frequency than that with a small diameter. An analysis of this reason was also carried out using the recently proposed Litz wire copper loss model, which revealed that the copper loss by the internal proximity effect tends to prevail in the large-diameter Litz wire to cause deterioration of the frequency dependence of the ac resistance. The analysis also suggested that sparse distribution of the strands as well as thinner strands can be effective to mitigate this effect, which can be a key to solve this problem in the Litz wire for high power applications.

本文言語English
ホスト出版物のタイトル2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
出版社Institute of Electrical and Electronics Engineers Inc.
ISBN(電子版)9781728193878
DOI
出版ステータスPublished - 2022
イベント2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022 - Detroit
継続期間: 10月 9 202210月 13 2022

出版物シリーズ

名前2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022

Conference

Conference2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
国/地域United States
CityDetroit
Period10/9/2210/13/22

ASJC Scopus subject areas

  • 電子工学および電気工学
  • 機械工学
  • 安全性、リスク、信頼性、品質管理
  • エネルギー工学および電力技術
  • 再生可能エネルギー、持続可能性、環境
  • 制御と最適化

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