Three Dimensional Vibration Characteristics of the Permanent Magnet-HTSC Magnetic Bearing

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  • Ohashi Shunsuke
    Department of electrical engineering and computer sciences, Kansai University

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  • 永久磁石‐高温超電導バルク体による磁気ベアリングの３次元振動特性
  • 永久磁石・高温超電導バルク体による磁気ベアリングの3次元振動特性
  • エイキュウ ジシャク コウオン チョウデンドウバルクタイ ニ ヨル ジキ ベアリング ノ 3ジゲン シンドウ トクセイ

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Abstract

The three dimensional vibration of the rotor in a HTSC-permanent magnet bearing system is studied. We have developed the magnetic bearing system which can revolve up to 12,000rpm, and three dimensional vibration of the rotor is measured with laser displacement sensors. To consider the rotor vibration under the mechanical resonance state, static lateral and vertical pinning force of the magnetic bearing is measured. From the results, resonance frequency is given. There are two factors of mechanical resonance caused by the magnetic bearing. One is lateral equivalent spring and the other is vertical one. Influence of the resonance caused by the lateral spring is large, and that by the vertical one is small. Three dimensional vibration of the rotor position around the mechanical resonance frequency is measured. Because revolution of the rotor increases lateral force to the center, resonance frequency given from the free revolution experiment becomes larger than that from pinning force measurement.

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