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. 02, 2004
Filed:
Nov. 20, 2001
Ravishanker Krishnamoorthy, Singapore, SG;
Hin Sing Fong, Singapore, SG;
STMicroelectronics Asia Pacific (PTE) Ltd., Singapore, SG;
Abstract
A system for controlling the speed of an arm of a disk drive, including a feedback circuit for generating a feedback signal representative of the speed of the arm, and a drive circuit for comparing the feedback signal with a predetermined command signal representing a command speed, and adjusting a drive signal for a motor to drive the arm at the command speed. The feedback signal, which represents the back EMF of the motor, is compared with the command signal to determine an acceleration state of the arm and the acceleration state is used with a previous acceleration state to determine whether to adjust a predetermined level at which the motor is driven.