TY - JOUR
T1 - Interaction between ring permanent magnets and bulk Dy-Ba-Cu-O superconductors
AU - Kurabayashi, H.
AU - Horikoshi, S.
AU - Suzuki, A.
AU - Ikeda, M.
AU - Wongsatanawarid, A.
AU - Seki, H.
AU - Akiyama, S.
AU - Hiragushi, M.
AU - Murakami, M.
PY - 2010/11/1
Y1 - 2010/11/1
N2 - A combination of bulk Dy-Ba-Cu-O superconductors and permanent magnets can be used for various rotational applications such as flywheel energy storage and magnetic bearings. For practical applications, there are two important parameters: the levitation force and the stiffness. Since the superconductor and magnets are installed in a closed space, the attractive force is another important parameter that we should take care. In this study, we measured the levitation force and the stiffness by changing the thickness of a ring permanent magnet. We used ring Fe-Nd-B magnets 120 mm in outer diameter and 70 mm in inner diameter with the thicknesses of 5-40 mm. For superconductors, we used single-domain bulk Dy-Ba-Cu-O 47 mm in diameter and 10 mm in thickness. Six pellets of Dy-Ba-Cu-O were placed concentrically such that the inner diameter becomes 70 mm. The levitation forces increased with increasing the thickness of the permanent magnet but tended to saturate.
AB - A combination of bulk Dy-Ba-Cu-O superconductors and permanent magnets can be used for various rotational applications such as flywheel energy storage and magnetic bearings. For practical applications, there are two important parameters: the levitation force and the stiffness. Since the superconductor and magnets are installed in a closed space, the attractive force is another important parameter that we should take care. In this study, we measured the levitation force and the stiffness by changing the thickness of a ring permanent magnet. We used ring Fe-Nd-B magnets 120 mm in outer diameter and 70 mm in inner diameter with the thicknesses of 5-40 mm. For superconductors, we used single-domain bulk Dy-Ba-Cu-O 47 mm in diameter and 10 mm in thickness. Six pellets of Dy-Ba-Cu-O were placed concentrically such that the inner diameter becomes 70 mm. The levitation forces increased with increasing the thickness of the permanent magnet but tended to saturate.
KW - Levitation force
KW - Permanent magnet
KW - Stiffness
UR - http://www.scopus.com/inward/record.url?scp=77957895182&partnerID=8YFLogxK
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U2 - 10.1016/j.physc.2010.05.221
DO - 10.1016/j.physc.2010.05.221
M3 - Article
AN - SCOPUS:77957895182
VL - 470
SP - 1853
EP - 1855
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 20
ER -