IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Frequency responce function of magnetic bearings using high temperature superconductor
Hiromasa HigasaRyoichi TakahataHiroshi ImaizumiKenzo Miya
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1995 Volume 115 Issue 10 Pages 1276-1283


High-temperature superconductor Y Ba2Cu3O7-x with strong pinning force has allowed the realization of stable magnetic suspension with no control. Two type superconducting magnetic bearings (SMB) using YBCO and permanent magnet were assembled. There were a radial type and an axial type. Dynamic stiffness of each SMB, while being cooled down under a magnetic field by liquid nitrogen, was measured both in radial and axial directions. As a result, it was found that the spring constants of these SMBs were almost as large as a practically desirable value but 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.

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