Vibration characteristics in magnetic levitation type seismic isolation device composed of multiple HTS bulks and permanent magnets

M. Tsuda, T. Kojima, T. Yagai, T. Hamajima

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

An HTS bulk field-cooled by a permanent magnet can levitate stably without any other control systems. The stable levitation can be realized by a specific characteristic of the HTS bulk that the HTS bulk returns to its original position by restoring force against horizontal displacement. We devised a magnetic levitation type seismic isolation device taking advantage of the specific characteristic of the HTS bulk. This device is quite different from conventional one composed of bearing and damper, because this device can completely remove horizontal vibration. We made a model device composed of YBCO bulks and permanent magnets to verify the seismic isolation effect of our device. Levitation force and vibration stability strongly depend on magnetic stiffness between HTS bulk and permanent magnet. Therefore, we prepared an YBCO bulk and a permanent magnet unit arranged on a row and investigated the characteristics of levitation force and horizontal vibration as functions of vibration amplitude, vibration frequency, and initial air gap between the bulk and the permanent magnet unit. Large initial air gap is desirable for levitation force, while small air gap under operation is effective for securing vibration stability.

Original languageEnglish
Pages (from-to)2059-2062
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume17
Issue number2
DOIs
Publication statusPublished - 2007 Jun 1

Keywords

  • Horizontal vibration
  • Magnetic levitation
  • Seismic isolation device
  • YBCO bulk

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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