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:
Nov. 08, 2011
Filed:
Jun. 26, 2008
Robert P. Ryan, Mission Viejo, CA (US);
Brett A. Henne, Lake Forest, CA (US);
Steven Nemshick, Santa Ana, CA (US);
Robert P. Ryan, Mission Viejo, CA (US);
Brett A. Henne, Lake Forest, CA (US);
Steven Nemshick, Santa Ana, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
A disk drive is disclosed comprising a disk, a head actuated over the disk, and a spindle motor for rotating the disk, wherein the spindle motor comprises a plurality of windings. During a spin-up operation of the disk, a sinusoidal driving signal is applied to each winding of the spindle motor for a spin-up interval, wherein during at least eighty percent of the spin-up interval the sinusoidal driving signals are applied to the windings of the spindle motor open loop.