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:
Jun. 18, 2013
Filed:
May. 06, 2011
Kang Hai Lim, Singapore, SG;
Chi Zhang, Singapore, SG;
BI Qiang, Singapore, SG;
Yuheng Wang, Singapore, SG;
Choon W. NG, Singapore, SG;
Mingzhong Ding, Singapore, SG;
Kiankeong Ooi, Singapore, SG;
Kang Hai Lim, Singapore, SG;
Chi Zhang, Singapore, SG;
Bi Qiang, Singapore, SG;
Yuheng Wang, Singapore, SG;
Choon W. Ng, Singapore, SG;
Mingzhong Ding, Singapore, SG;
KianKeong Ooi, Singapore, SG;
Seagate Technology LLC, Cupertino, CA (US);
Abstract
A multi-stage tracking control system includes at least a main actuator and a microactuator. The tracking control system is switched to a single-stage mode so that the main actuator alone provides tracking. A disturbance signal is applied to the microactuator while in the single-stage mode, and a failure condition of the microactuator is determined based on a position error generated in response to the disturbance signal.