| 摘要 |
A bearing device supporting a rotation shaft (13) of a fuel cell compressor (1) includes a pair of radial foil bearings (21,22) and mounted in concentric relation to the rotation shaft and supporting the rotation shaft in a radial direction, and an axial magnetic bearing (23) opposed to the rotation shaft in an axial direction and supporting the rotation shaft in the axial direction. A control device (61) includes bearing life diagnostic unit for accumulating times during which a rotational speed of the rotation shaft has been below a predetermined value, so as to obtain a cumulative contact time, thereby judging a bearing lifetime.
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