EXPERIMENTAL INVESTIGATION OF SHOCK RESPONSES OF CANTILEVER-SHAFT DESIGN HYDRODYNAMIC BEARING SPINDLE MOTORS

Open-loop radial operating shock responses of spindle motors are studi ed experimentally. Unlike a bah bearing spindle, a hydrodynamic bearin g (HDB) is able to suppress the vibration within a few milliseconds. H owever, HDB spindles have higher response amplitudes than ball bearing spindles. HDB response;amplitude is linearly proportional to the shoc k impulse amplitude at the current test range. A longer shock duration has a higher response amplitude. Reducing compliance of the thrust be aring does not affect the shock response amplitudes but does reduce th e power consumption.