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. 27, 2015
Filed:
May. 27, 2014
Western Digital Technologies, Inc., Irvine, CA (US);
Michael T. Nicholls, Laguna Hills, CA (US);
Taylor Norito Kelena Watanabe, Tustin, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
A data storage device is disclosed comprising a head actuated over a disk, and a spindle motor configured to rotate the disk. A speed of the spindle motor is sampled, and an error signal is generated based on a difference between the sampled speed and a target speed. A sliding mode control signal for controlling a speed of the spindle motor is generated based on a first non-zero gain when the error signal is greater than zero and less than a first positive threshold, and a second non-zero gain when the error signal is greater than the first positive threshold.