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:
Apr. 27, 2021
Filed:
Dec. 13, 2017
Seagate Technology Llc, Cupertino, CA (US);
Jian Chen, Redhill, SG;
Xiong Liu, Upper Bukit Timah, SG;
Wei Sung Lee, Choa Chu Kang, SG;
Erwin Mochtar Wijaya, Clementi, SG;
Seagate Technology LLC, Fremont, CA (US);
Abstract
Measuring ramp friction in a disk drive including receiving a lift tab ramp load time profile for a voice coil motor and determining a load torque profile for a lift tab on the ramp based at least on the received ramp load time profile. The measuring also includes receiving a lift tab ramp unload time profile for the voice coil motor and determining an unload torque profile for the lift tab on the ramp based at least on the received ramp unload time profile. The measuring also includes calculating a ramp friction torque component based on the determined load torque profile and unload torque profile.