Resumen de Reduction of eddy current loss in magnetoplated wire

Tsutomu Mizuno, Shigemi Enoki, Takeyuki Suzuki, Takashi Asahina

• 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.