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:
Dec. 05, 1995
Filed:
Jul. 08, 1993
Paul F Dunn, Longmont, CO (US);
David S McMurtrey, Loveland, CO (US);
Maxtor Corporation, Longmont, CO (US);
Abstract
An apparatus and method for torque disturbance precompensation in a disk drive spindle motor includes an amplifier for providing current to the spindle motor in response to an input signal. A velocity detector determines the velocity of the motor, which is then compared to a predetermined velocity to generate an error signal. Compensator elements of the control loop develop an actuating signal from the error signal. The actuating signal is then summed with a torque correction value provided by a look-up table. The torque correction value precompensates the motor by causing the amplifier to provide an additional incremented current to the motor. The additional current corrects the torque disturbance resulting from the movement of the heads across the disk.