Multirate Digital Control for Sector Servo System
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
Disclosed is a method to implement a digital controller for a disk drive actuator using a sector servo system. The controller estimates all state variables not only at sector servo sample time, but also at least once in between servo samples. The increased state estimation enables the computation of the voice coil motor (VCM) control current at a faster rate, and results in better control-loop performance.