Title :
Pivot nonlinearity in disk drive rotary actuator: measurement and modeling
Author :
Byun, Y.K. ; Park, J.H. ; Chang, H.S. ; Ro, K.C. ; Chung, C.C.
Author_Institution :
Electro Mech. Lab., Samsung Adv. Inst. of Technol., Suwon, South Korea
fDate :
9/1/1997 12:00:00 AM
Abstract :
As track density increases, the effects of nonlinearity in the pivot bearing of the hard disk drive on the servo performance are becoming more important. Recently, increasing attention is given to more precise experimental observation and modeling of pivot nonlinearity to achieve improved servo control. In this paper, we propose a new model that predicts improved pivot nonlinearity over existing “preload+two slope” models in matching simulation and experimental results in both the time and frequency domains. Experimental measurements are carried out to validate and identify the specific nonlinearities present in the pivot bearing when it is in fine motion
Keywords :
actuators; hard discs; magnetic recording; servomechanisms; hard disk drive; pivot nonlinearity; rotary actuator; servo control; Disk drives; Frequency; Frequency domain analysis; Hard disks; Laboratories; Motion measurement; Nonlinear distortion; Pneumatic actuators; Predictive models; Servomechanisms; Servosystems; Voltage; Wires;
Journal_Title :
Magnetics, IEEE Transactions on