Minimization of flexible cable settling PES in high TPI HDD via mechatronic integration

Abstract

This paper presents a modeling and design methodology to reduce and even to eliminate flexible ribbon cable seek-settling induced vibrations in modern high capacity computer disk drives. Optimization is first conducted in obtaining proper cable profiles when the rotary actuator swings across the disk using classical elastica theory with consideration of compliant boundary at its J-block conjunction point with rotary actuator and fixed boundary conditions at bracket. In addition to modal kinetic coupling factor, the cable's vibration modes are projected onto actuator voice coil's excitations to form as a weighted response factor to serve as the cost function in optimization process. It was found through the proposed process that the seek-settling flexible cable vibration can be minimized and even reduced to zero. Additional servo adaptive control format will be also discussed in this paper to totally eliminate the flexible ribbon vibrations in disk drive's seek-settling operations.