Analysis of loss and temperature characteristics of high power contactless transformer due to high-frequency magnetic field fluctuations

Takuya Shimotsu; Keiichiro Kondo; Keigo Ukita

doi:10.1541/ieejias.137.350

Analysis of loss and temperature characteristics of high power contactless transformer due to high-frequency magnetic field fluctuations

Takuya Shimotsu, Keiichiro Kondo, Keigo Ukita

Research output: Contribution to journal › Article › peer-review

Abstract

In contactless power transformers, the electric power is transmitted at a high frequency. Therefore, the skin and proximity effects much increase the AC resistance. In this paper, the influence of the magnetic field and frequency on the equivalent resistance of the coils is evaluated. In addition, the iron loss characteristics are evaluated by considering the excitation voltage. The iron and copper losses due to the skin and proximity effects in a 300 kW CPT transformer were estimated. Based on the results, the temperature rise characteristics were predictively studied using heat equivalent circuits. The results of this study contribute to the thermal design efforts of high power contactless power transformer coils.

Original language	English
Pages (from-to)	350-357
Number of pages	8
Journal	IEEJ Transactions on Industry Applications
Volume	137
Issue number	4
DOIs	https://doi.org/10.1541/ieejias.137.350
Publication status	Published - 2017 Jan 1
Externally published	Yes

Keywords

Contactless power transfer (CPT)
High power
Loss
Proximity effect
Skin effect
Temperature

ASJC Scopus subject areas

Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

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abstract = "In contactless power transformers, the electric power is transmitted at a high frequency. Therefore, the skin and proximity effects much increase the AC resistance. In this paper, the influence of the magnetic field and frequency on the equivalent resistance of the coils is evaluated. In addition, the iron loss characteristics are evaluated by considering the excitation voltage. The iron and copper losses due to the skin and proximity effects in a 300 kW CPT transformer were estimated. Based on the results, the temperature rise characteristics were predictively studied using heat equivalent circuits. The results of this study contribute to the thermal design efforts of high power contactless power transformer coils.",

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AU - Kondo, Keiichiro

AU - Ukita, Keigo

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N2 - In contactless power transformers, the electric power is transmitted at a high frequency. Therefore, the skin and proximity effects much increase the AC resistance. In this paper, the influence of the magnetic field and frequency on the equivalent resistance of the coils is evaluated. In addition, the iron loss characteristics are evaluated by considering the excitation voltage. The iron and copper losses due to the skin and proximity effects in a 300 kW CPT transformer were estimated. Based on the results, the temperature rise characteristics were predictively studied using heat equivalent circuits. The results of this study contribute to the thermal design efforts of high power contactless power transformer coils.

AB - In contactless power transformers, the electric power is transmitted at a high frequency. Therefore, the skin and proximity effects much increase the AC resistance. In this paper, the influence of the magnetic field and frequency on the equivalent resistance of the coils is evaluated. In addition, the iron loss characteristics are evaluated by considering the excitation voltage. The iron and copper losses due to the skin and proximity effects in a 300 kW CPT transformer were estimated. Based on the results, the temperature rise characteristics were predictively studied using heat equivalent circuits. The results of this study contribute to the thermal design efforts of high power contactless power transformer coils.

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KW - Proximity effect

KW - Skin effect

KW - Temperature

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