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. 17, 2015
Filed:
Sep. 22, 2014
Western Digital Technologies, Inc., Irvine, CA (US);
Michael T. Nicholls, Laguna Hills, CA (US);
Timothy A. Ferris, Mission Viejo, 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, wherein the spindle motor comprises a plurality of windings. A commutation controller is configured to commutate the windings based on a commutation sequence. Compensation values are generated based on:1 sin ω11 cos ωwhere A1 and B1 are adaptable coefficients and ω1 represents a first frequency based on a first mechanical parameter of the spindle motor. The compensation values are used to drive the commutation sequence of the commutation controller.