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:
Jan. 29, 2002
Filed:
Sep. 15, 1998
Donald Lee Clare, Morgan Hill, CA (US);
Troy Tse-Quong Lee, San Jose, CA (US);
Louis Joseph Serrano, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system and method for compensation for variation in a voice coil motor's torque factor due to changes in temperature to improve the seek performance of a disk drive. The method uses the numerical relationship between change in torque factor and change in temperature (G) for the voice coil motor, combined with torque factor K and temperature at/near the voice coil motor measured at a first time (for example during the initial start-up of the disk drive during the automatic recalibrations that is performed during a start-up, (K ) and (T ) respectively). These K and T can be stored in memory. At some later predetermined interval or event, the temperature at or near the voice coil motor is again measured (T ). From these known temperature and torque factor parameters, in combination with the known relationship between temperature and torque factor for the voice coil motor, the K at the future time/event (K ) can be calculated. This new K has been adjusted for temperature and can now be used in the seek algorithm in place of the original K which results in more optimal seek performance.