HOCHGESCHWINDIGKEITSROTORANORDNUNG

摘要

A ring-shaped magnet (19) is bonded to an outer circumferential portion of a rotary body (21) supported on a rotary shaft (13) which forms a radial dynamic gas pressure bearing. A ring-shaped magnet (23) is provided with a predetermined distance maintained between itself and the ring-shaped magnet (19). Owing to the magnetic attractive force of these two ring-shaped magnets (19, 23), the rotary body (21) is restricted in its axial movement and held radially rotatable. Since the rotary body (21) is held in a 0.5 decentered state due to the difference in the magnetic balance between the ring-shaped magnets (19, 23), the radial dynamic gas pressure bearing generates a high dynamic pressure. A high dynamic pressure occurs due to herringbone dynamic gas generating grooves (15a, 15b) as well. Owing to the synergetic effect of these parts, a very high radial load capacity occurs, and the rotational accuracy is improved.