Abstract
A split-type herringbone-grooved journal gas bearing has been developed to support the high-frequency rotations of a practical rotor for a micro machine such as a palmtop gas turbine generator currently in development. For this particular application, the critical mass of the rotor and the operable clearance of the journal and thrust bearings are designed to rotate at over 14 kHz ( 840,000 rpm ). The test journal bearing and rotor have a radial clearance of 0.008 mm and a mass of 0.0042 kg. The roundnesses of the test journal bearing under the processed and reassembled conditions were measured using a 3-D coordinate measuring machine and compared to verify the repeatability of the bearing assembly; the difference in the measured roundness between each condition was about 0.003 mm, which includes axial assembly error. A rotational test of the rotor supported by the bearings was performed on a test rig. In this bearing, the maximum rotational frequency of the rotor reached 13.4 kHz ( 804,000 rpm ). Therefore, the operational stability of the system was verified.
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