Dynamic Characteristics of a Superconducting Magnetic Bearing under μm Displacements
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
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 language | English |
|---|---|
| Article number | 9353222 |
| Journal | IEEE transactions on applied superconductivity |
| Volume | 31 |
| Issue number | 5 |
| Publication status | Published - Aug 2021 |
| Peer-reviewed | Yes |
Keywords
ASJC Scopus subject areas
Keywords
- bearing characteristics, dynamic properties, Superconducting magnetic bearing