積層鉄心の局部磁束波形の新しい推定法

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  • A New Method for Estimating Localized Flux Waveform in Laminated Core
  • セキソウ テッシン ノ キョクブ ジソク ハケイ ノ アタラシイ スイテイホウ

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Localized flux waveforms in laminated core are usually measured by using a search-coil method. However, this method has several problems due to holes for search coils, such as measurement error of magnetic field strength due to deterioration of magnetic properties in and around hole, and restrictions of distance between holes and number of measuring positions. In order to overcome those difficulties, a stylus-probe method and an improved probe method have been developed. Although these methods enable us to measure localized flux waveforms in a single sheet, they are not applicable to the laminated core because of insufficient interlaminar gap for setting probes and necessity for setting probes at corresponding positions on both sides of all sheets in the laminated core. In this paper, a new nondestructive method called a "B-estimated method" for evaluating localized flux waveforms in the laminated core is proposed. The effectiveness of the newly proposed method is validated by measuring waveforms of flux density and magnetic field strength, and by calculating iron losses from those waveforms at several positions in a model transformer.

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