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Frequency response function of magnetic bearings using high‐temperature superconductor
Author(s) -
Higasa Hiromasa,
Takahata Ryoichi,
Imaizumi Hiroshi,
Miya Kenzo
Publication year - 1996
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391160309
Subject(s) - superconductivity , axial symmetry , materials science , electromagnetic suspension , stiffness , magnetic bearing , magnetic field , magnet , liquid nitrogen , superconducting magnet , condensed matter physics , spring (device) , suspension (topology) , nuclear magnetic resonance , composite material , thermodynamics , physics , mechanical engineering , structural engineering , engineering , mathematics , quantum mechanics , homotopy , pure mathematics
A high‐temperature superconductor YBa 2 Cu 3 O 7‐x with strong pinning force has allowed stable magnetic suspension with no control to be developed. Two types of superconducting magnetic bearings (SMB) using YBCO and permanent magnet were assembled. The two types are radial and axial. The dynamic stiffness of each SMB as it was cooled down under a magnetic field by liquid nitrogen was measured both radially and axially. As a result, it was found that the spring constants of these SMBs were almost as large as a practically desirable value; however, their damping coefficients were lower than the practical level. These findings are useful as one of the data bases for development of an optimum SMB design to support the weight of rotors in an axial direction.