5723 Design of Damping Mechanism for Nano-Motion Actuator

Abstract

Our proposed nano-motion actuator (NMA) was applied for a high speed and precise spin-stand tester which evaluated high areal density magnetic recording. Since, the NMA characteristic was a second order lag element that had large amplitude at a resonance frequency, a mechanical damper should be indispensable with keeping control performance. Although the damper worked effectively for the NMA, its mechanism was not solved yet. In the paper, we approach to analyze the damper mechanism from its frequency response which is a damping coefficient depending on velocity (angular frequency).