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. 29, 2000
Filed:
Aug. 29, 1997
Jason D Gregg, Oklahoma City, OK (US);
Seagate Technology, Inc., Scotts Valley, CA (US);
Abstract
An apparatus and method for optimizing the gain of a disc drive servo circuit are disclosed, the servo circuit controllably positioning a head adjacent tracks of a disc of the disc drive. A model reference seek is performed using sinusoidally derived reference current, velocity and position signals to move the head from an initial track to a destination track, during which position error is accumulated over a plurality of time periods associated with the seek. The position error is normalized in relation to the length of the seek. A gain adjustment value is next determined in relation to a difference between the normalized position error and a nominal position error associated with a nominal value of gain for the servo circuit, a scale factor being applied to the difference to control the convergence rate of the gain. The gain is thereafter adjusted using the gain adjustment value.