回転磁界を用いた磁粉探傷試験における発生磁界の評価
Evaluation of generated field in magnetic-particle testing using rotating field
著者:
福岡 克弘 Katsuhiro FUKUOKA 橋本 光男 Mitsuo HASHIMOTO 赤松 里志 Satoshi AKAMATSU
発刊日:
公開日:
densityMagnetic-particle testingLeakage fluxRotating magnetic flux densityThree-phase AC
概要
In yoke method magnetic-particle testing, it is necessary to perform the testing at least two times by changing the direction of magnetization. In a rotating field type magnetizer using a three-phase al ternating current (AC), any directional flaw can be detected by a single testing. In this research, the distributions of the rotating magnetic flux density were evaluated by measuring this density using Hall elements (in three directions) and by numerical analysis. The distributions of the magnetic flux density around the flaw were also evaluated by numerical analysis. The distribution of the rotating magnetic flux density near the central part of the magnetizer was made clear, and it was confirmed that the distribution became more uniform by equalizing the impedance of each coil of the magnetizer.
