Dependency of hysteretic loss on speed and tilt in a rotating superconducting magnetic bearing

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Tilo Espenhahn - , Faculty of Mechanical Science and Engineering, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Maria Sparing - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Anne Berger - , 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, TUD Dresden University of Technology (Author)
  • Ruben Hühne - , Leibniz Institute for Solid State and Materials Research Dresden (Author)

Abstract

Superconducting magnetic bearings enable friction-free rotation, which is beneficial for different applications. Whereas mechanical losses are drastically reduced, additional hysteretic losses might be generated as for example by a process-related tilt of the field-cooled permanent magnet of the superconducting bearing. We designed a caloric measurement setup with a resolution down to 5 mW in order to study such losses in more detail. Therefore, a field-cooled magnet ring is deliberately tilted up to 3 before it rotates with a speed of up to 5000 rpm above the superconducting ring. The generated losses inside the superconductor lead to an increased evaporation rate in the attached liquid nitrogen bath, which in turn results to a measurable volume flow. The determined losses increase almost linear with speed, whereas an exponential increase was observed for the tilt angle. The results were confirmed by 2D simulations using a two-component model leading to similar dependencies for the hystertic losses on speed and tilt.

Details

Original languageEnglish
Article number125004
JournalSuperconductor science and technology
Volume34
Issue number12
Publication statusPublished - Dec 2021
Peer-reviewedYes

Keywords

Keywords

  • Hysteretic loss, Loss measurements, Superconducting magnetic bearing