| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 102 === The spindles need to use the bearings to suspense the rotor in the rotating machines. In these bearing systems, the fluid hydrodynamic bearings with low noise, high precision, low vibration, long lifetime, and suitable running in the long time operation are more commonly be used in the heavy load system or the long time operation systems.The load capacity of the fluid hydrodynamic bearings as starting or operating at low speed are very small. The phenomenon of dry rub in the bearing and journal will occur and would damage the rotor system. Therefore, in this study, we wish to propose a passive magnetic bearing to combine with the fluid hydrodynamic bearings to improve the drawback to make the magnet-fluid hybrid hydrodynamic bearings could maintain better characteristics as the rotor system is starting or operating at low speed.
In this study, the goal is to improve the load capacity of the fluid hydrodynamic bearings by an auxiliary magnetic force from the permanent magnets to promote the lifetime of bearings. Several combination types of the permanent magnets were proposed. By simulation analysis of the magnetic field, the relationship of magnetic forces and positions of magnets can be calculated. Then we can design a suitable passive magnetic bearing on hydrodynamic bearing to be a hybrid bearing to support the rotor. The hybrid bearing can provide magnetic forces to support the spindle suspending in the hydrodynamic bearing with a little gapes. It will make the rotor and the stator would not contact as they are not running or at a low running speed. Thus there have no dry friction in the bearing and the lifetime of the bearing will be promoted.
Keywords: Fluid Hydrodynamic Bearings, Passive Magnetic Bearing, Magnet-Fluid Hybrid Hydrodynamic Bearings.
|
|---|
