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:
Aug. 30, 2005
Filed:
Nov. 07, 2002
Hien Phu Dang, Nanuet, NY (US);
Mirei Hosono, Kanagawa-ken, JP;
Naoyuki Kagami, Kanagawa-ken, JP;
Kenji Okada, Kanagawa-ken, JP;
Arun Sharma, New Rochelle, NY (US);
Gordon James Smith, Rochester, MN (US);
Sri M. Sri-jayantha, Ossining, NY (US);
Hien Phu Dang, Nanuet, NY (US);
Mirei Hosono, Kanagawa-ken, JP;
Naoyuki Kagami, Kanagawa-ken, JP;
Kenji Okada, Kanagawa-ken, JP;
Arun Sharma, New Rochelle, NY (US);
Gordon James Smith, Rochester, MN (US);
Sri M. Sri-Jayantha, Ossining, NY (US);
Hitachi Global Technologies Netherlands B.V., Amsterdam, NL;
Abstract
An apparatus and method of controlling an actuator of a data storage device detect and/or correct narrowband mechanical excitations such as due to spindle bearing defects through sensing and/or rejecting disturbance frequencies associated with such narrowband mechanical excitations in an actuator control signal generated by a data storage device controller. A narrowband filter may be used to reject, from an actuator control signal generated by a data storage device controller, a disturbance frequency associated with a spindle bearing defect in a data storage device, and disposed in proximity to a zero crossover frequency associated with the data storage device controller. In addition, a peak filter disposed in a control loop of a data storage device controller may be configured to detect a spindle bearing defect in a data storage device by detecting an amplitude of a control signal in the control loop in proximity to a disturbance frequency associated with the spindle bearing defect.