Dynamic Characteristics of a Superconducting Magnetic Bearing under μm Displacements

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Tilo Espenhahn - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Maria Sparing - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Claudia Niklas - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Kornelius Nielsch - , Chair of Metallic Materials and Metal Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Ruben Huhne - , Leibniz Institute for Solid State and Materials Research Dresden (Author)

Abstract

The dynamic properties of a ring-shaped superconducting magnetic bearing used in textile machines were studied for a micrometer displacement range. Therefore, a new measurement setup was designed that allows to excite the freely levitating magnet ring in a defined direction with small excitation amplitudes. Here, we focus on radial and axial excitations with amplitudes between 2 μm and 30 μm. The data were analyzed by a fast Fourier transformation approach. The resultant excitation response was fitted by the transfer function of a spring-mass-damper system under harmonic force excitation, which gives the stiffness and damping coefficient for the particular excitation direction. The analysis shows a minor stiffness increase with decreasing excitation amplitudes in radial as well as in axial direction. At the same time, no clear trend was found for the damping coefficient. In contrast to other bearing designs, the studied ring-shaped bearing exhibits a ratio of 3 between the axial and radial stiffness.

Details

Original languageEnglish
Article number9353222
JournalIEEE transactions on applied superconductivity
Volume31
Issue number5
Publication statusPublished - Aug 2021
Peer-reviewedYes

Keywords

Keywords

  • bearing characteristics, dynamic properties, Superconducting magnetic bearing