Magnetic damper consisting of a combined hollow cylinder magnet and conducting disks

Yoshihisa Takayama, Takahiro Kondou

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

It is recognized that unstable vibration occurs at a rotating speed above the major critical speed by a rotating-conducting-disk type magnetic damper, but not by a rotating-circular-magnet type magnetic damper. In addition, magnetic dampers generally have relatively poor damping performance. In the present work, two new rotating-circularmagnet type magnetic dampers, (which consist of a combined hollow cylinder magnet with alternating directional magnetic poles), are introduced and their design method is presented. Applying the modeling method that the authors have been studying, a prototype magnetic damper with a combined magnet is fabricated and the damping ratios from the analytical results agree well with those from the experimental results. Rotating tests are performed and it is confirmed that unstable vibration does not occur at a rotating speed of more than twice the major critical speed. Based on these findings, an optimally designed magnetic damper with a combined magnet is developed and a damping ratio of 0.25 (damping coefficient of 215 Ns/m) is achieved.

Original languageEnglish
Article number051007
JournalJournal of Vibration and Acoustics, Transactions of the ASME
Volume135
Issue number5
DOIs
Publication statusPublished - Aug 14 2013

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering

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