Reduction of eddy current loss in magnetoplated wire

Abstract

Purpose

The purpose of this paper is to reduce eddy current loss in a wire that is affected by an alternating field passing through it. This allows the efficiency of transformers to be upgraded and the quality factor in coils to be increased.

Design/methodology/approach

The use of a magnetoplated wire (MPW) is proposed to reduce eddy current loss in a wire. An MPW is a copper wire (COW) whose circumference is plated with a magnetic thin film. In additional, the theoretical equation for eddy current loss in an MPW is derived for ease of analysis.

Findings

The eddy current loss in an MPW is calculated as a function of the relative permeability and resistivity of its magnetic thin film to reduce the resistance due to the proximity effect of a coil. The eddy current loss in an MPW whose magnetic thin film has a relative permeability of 500 and a resistivity of 0.12 μΩm can be reduced to 4 percent that of COW at a frequency of 1 MHz.

Originality/value

The use of MPW can be expected to upgrade the efficiency of transformers and to increase the quality factor in coils.

Citation

Mizuno, T., Enoki, S., Suzuki, T., Asahina, T., Noda, M. and Shinagawa, H. (2009), "Reduction of eddy current loss in magnetoplated wire", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 28 No. 1, pp. 57-66. https://doi.org/10.1108/03321640910918869