Affiliations: [a] The University of Shiga Prefecture, Hikone, Shiga, Japan | [b] Development Department Denshijiki Industry Co., Tokyo, Japan
Correspondence:
[*]
Corresponding author: Katsuhiro Fukuoka, The University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga 522-8533, Japan. Tel.: +81 749 28 9554; Fax: +81 749 28 9554; E-mail:[email protected]
Abstract: In a rotating-magnetic-field-type magnetizer using a
three-pole (three-phase) coil, omnidirectional cracks can be detected via a
single test. However, the rotating magnetic field ultimately experiences
non-homogeneous distribution in an area far from the centre of the
magnetizer. In this study, a multi-coil-type magnetizer that widely obtains
uniform rotating magnetic fields was hence developed. Distributions of
rotating magnetic flux densities in test object were evaluated using
finite-element analysis, and the utility of the multi-coil was confirmed. In
addition, the technique for omnidirectional magnetization on whole surfaces
of 3D-shaped test object was considered via implementation of the subject
multi-coil magnetizer.
Keywords: Magnetic particle testing, rotating magnetic field, multi coil, omnidirectional magnetization, finite element method
