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:
Oct. 21, 2003
Filed:
Jun. 30, 2000
Jie Yu, Irvine, CA (US);
David B. Joan, Trabuco Canyon, CA (US);
Western Digital Technologies, Inc., Lake Forest, CA (US);
Abstract
A method of tuning a servo control system in a disk drive that implements seeks using a the feed-forward command effort signal u and a PES reference signal r that were designed to be compatible with one another on the basis of a modeled frequency response G (z) that is different from an actual frequency response G(z). The steps includes scaling the feed-forward command effort signal u to substantially achieve a zero velocity condition at an end of the seek; scaling the feed-forward command effort signal u to substantially achieve an on-target condition at the end of the seek; and modifying the PES reference signal r such that it substantially varies in unison with the indicated PES signal y during the seek