真円流体軸受ディスクスピンドルの安定性と不釣合い剛性の試作による評価(機械力学,計測,自動制御)

概要

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We have proposed a simple disk spindle model supported by a plain journal fluid bearing at the upper part of shaft and a spherical grooved pivot bearing at the bottom of shaft and made clear that this spindle system can be stabilized by the gyro effect theoretically. In this study we manufactured three prototypes of the disk spindle composed of two 3.5 inch disk platters, a plain journal bearing and a spherical grooved pivot bearing. Then we measured radial and axial vibrations at rotational speed up to 9150 rpm. We confirmed the stability of the spindle and found that the averaged amplitude of half frequency whirl is about 30 nm. We also evaluated the NRRO and found that the tracking error due to NRRO is comparable to the conventional one. Unbalance stiffness is estimated to be larger than the conventional one if the bearing size is identical.
社団法人日本機械学会の論文
2004-12-25