The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 2013
Filed:
Sep. 16, 2008
Fu-ying Huang, San Jose, CA (US);
Tetsuo Semba, San Jose, CA (US);
Xiaotian Sun, Saratoga, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
A disk drive and a method for operating the disk drive compensates for rotational vibration (RV) by adaptively modifying the gains of two separate linear vibration sensors so the sensor gains are optimal under any given condition. The two sensors provide two signals S, S, respectively, to the disk drive's servo control processor that generates the control signal to the voice coil motor (VCM) actuator that controls the positioning of the read/write head. The processor uses S, Sand the head position error signal (PES) as inputs to run an adaptive RV feedforward (RVFF) algorithm. The adaptive RVFF algorithm takes the PES and sensor outputs Sand Sas inputs, mathematically determines the required correction to the sensor gain factors kand k, respectively, and then adjusts the gain factors kand kaccordingly. Each signal S, Sis then modified by its adjusted gain factor k, k, respectively. The difference in the modified S, Ssignals is the RVFF signal that is summed with the control signal to generate the RV-compensated control signal to the VCM actuator.