Affiliations: [a] Convergence Component and Material R&D Group,
Busan, Korea | [b] Department of Mechanical Engineering, Pusan National
University, Busan, Korea | [c] School of Mechanical Design and Manufacturing, Busan
Institute of Science and Technology, Busan, Korea | Université Laval, Canada | Tohoku University, Japan
Correspondence:
[*]
Corresponding author: Kyung-Hwan Hwang, Convergence Component
and Material R&D Group, Kitech, Busan 609-735, Korea. Tel.: +82 51 974
9266; Fax: +82 51 974 9308; E-mail: hkhnow@kitech.re.kr
Abstract: Magnetostrictive (MS) materials exhibit a large strain and a high
energy-density, because of their large MS coupling coefficient. In particular,
an MS actuator that uses Terfenol-D generates great-force and strain. The
efficiency of an MS actuator is highly dependent on the pre-stress, magnetic
field intensity, magnetic bias and thermal expansion. The specific type or
shape of permanent magnet (PM) needed for a given magnetic bias is determined
using numerical simulation. According to magnetic field the heat created by
resistance influences the thermal expansion. This paper proposes the optimal
exterior PM for achieving a magnetic bias and minimizing the ohmic heat effect
with a geometric composite of an electromagnet considered to be a practically
precise MS actuator.
Keywords: Magnetostrictive (MS) materials, MS actuator, magnetic bias, ohmic heat
