| 摘要 |
A gas is fed, so as to cause a gas flow to occur from a lower opening of a bearing hole of a sleeve 6 in an outward direction of an annular portion 12a of a rotor hub 12 via a radial gap 50 and an upper opening of the bearing hole, thereby lifting a rotor section 10. In a condition where the rotor section 10 is lifted, the magnitude of run-out synchronized with the rotation of the rotor section 10 is measured by using a displacement gauge 40. Then, based on the magnitude of run-out synchronized with the rotation, the run-out of the rotor section 10 is adjusted.
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