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:
Mar. 26, 2019
Filed:
Apr. 19, 2018
Applicant:
Western Digital Technologies, Inc., San Jose, CA (US);
Inventors:
Jaesoo Byoun, Irvine, CA (US);
Brian A. Johnson, Laguna Hills, CA (US);
Timothy A. Ferris, Mission Viejo, CA (US);
Assignee:
Western Digital Technologies, Inc., San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/09 (2006.01); G11B 5/012 (2006.01); G11B 5/82 (2006.01); G11B 5/33 (2006.01); G11B 19/20 (2006.01);
U.S. Cl.
CPC ...
G11B 5/012 (2013.01); G11B 5/33 (2013.01); G11B 5/82 (2013.01); G11B 19/2054 (2013.01);
Abstract
A data storage device is disclosed comprising a head actuated over a disk, and a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings. During a power failure the head is unloaded by generating a periodic signal, shorting the windings of the spindle motor based on the periodic signal in order to generate a power voltage, and adjusting the periodic signal based on an amplitude of the power voltage.