| 摘要 |
PURPOSE:To obtain a low vibration type rotary body mechanism by coupling and fixing a hub and a motor rotor fixing a disc with a rotary shaft unitedly to form the rotary body mechanism and by forming a top type rotary structure arranging a pivot type bearing and a magnetic bearing on the lower and upper parts of the rotary body mechanism respectively. CONSTITUTION:The rotary shaft 1 is united with the motor rotor 9. The disc 6 is fixed on the hub 5 coupled with the rotary shaft 1. In addition, a motor stator 10 is fixed on a base 3. The lower part of the rotary shaft 1 has the pivot type bearing 11 structure. The bearing 11 has both functions of a radial bearing and a thrust bearing. The load of the thrust direction is supported by a rotary ball 12 through the pivot bearing 11. The rotary ball 12 supports only the load of the thrust direction. The rotary body mechanism system rotates like a top by the driving force of revolution and the vibration displacement of the rotary body is centered by the pivot bearing 11 and a centering spring 13 on the lower part and the magnetic bearing 15 on the upper part, so that vibration is suppressed low by a squeezing oil film 14 on the lower part or attenuation force inside the magnetic bearing 15. |
