TY - JOUR
T1 - Rotation loss reduction of superconducting magnetic bearings by stacking and rearranging the shape of the bulks
AU - Kita, M.
AU - Ichihara, T.
AU - Masaie, I.
AU - Demachi, K.
AU - Sakai, N.
AU - Hirabayashi, I.
N1 - Funding Information:
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Superconducting Bearing Technologies for Flywheel Energy Storage System.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005/10/1
Y1 - 2005/10/1
N2 - Energy storage by a flywheel system has recently been developed as a promising application of high temperature superconducting bulks. Rotation loss reduction is necessary for an efficient operation of the superconducting magnetic bearings (SMB), which is the most essential component of the system. Typical radial type SMB consists of a superconductor stator and a permanent magnet rotor that is sustained by a magnetic force deduced from high flux pinning of the bulk superconductors. If the stator is a simply segmented circular array of Y-Ba-Cu-O bulks, inhomogeneity of the trapped magnetic field is unavoidable, which induces eddy currents in the metallic component in the rotor. Such a rotation loss is one of the major problems for a practical use of SMB. We will present the relationship between the inhomogeneous magnetic field and the rotation loss of SMB and give a general principle for reduction of rotation loss in SMB.
AB - Energy storage by a flywheel system has recently been developed as a promising application of high temperature superconducting bulks. Rotation loss reduction is necessary for an efficient operation of the superconducting magnetic bearings (SMB), which is the most essential component of the system. Typical radial type SMB consists of a superconductor stator and a permanent magnet rotor that is sustained by a magnetic force deduced from high flux pinning of the bulk superconductors. If the stator is a simply segmented circular array of Y-Ba-Cu-O bulks, inhomogeneity of the trapped magnetic field is unavoidable, which induces eddy currents in the metallic component in the rotor. Such a rotation loss is one of the major problems for a practical use of SMB. We will present the relationship between the inhomogeneous magnetic field and the rotation loss of SMB and give a general principle for reduction of rotation loss in SMB.
KW - Gd-Ba-Cu-O
KW - Rotation loss
KW - Superconducting magnetic bearing
KW - Y-Ba-Cu-O
UR - http://www.scopus.com/inward/record.url?scp=25644458377&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=25644458377&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2005.01.053
DO - 10.1016/j.physc.2005.01.053
M3 - Conference article
AN - SCOPUS:25644458377
SN - 0921-4534
VL - 426-431
SP - 821
EP - 825
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - I
T2 - Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity
Y2 - 23 November 2004 through 25 November 2004
ER -