Title :
An approach to dual-stage servo design in computer disk drives
Author :
Kim, Young-Hoon ; Lee, Seung-Hi
Author_Institution :
Storage Lab., Samsung Adv. Inst. of Technol., Suwon, South Korea
Abstract :
A novel design strategy is presented for a dual-stage actuator servo system in magnetic disk drives. Based on the existing decoupled-design strategy, we adopt the idea of the well-known zero-phase error tracking controller to minimize destructive effect resulting when two control loops are combined. Since the zero-phase tracking control requires previews of signals in a feedback loop, a kind of estimation scheme is suggested based on the actuators´ dynamic model. The best practical advantage is that we achieve systematically a low-order DSA controller capable of high-accuracy track following as well as of high-speed short-span track seek; besides, the existing single-stage controller is fully utilized. The performance of the proposed method is analyzed and demonstrated through simulation and experiment.
Keywords :
actuators; disc drives; hard discs; position control; servomechanisms; tracking; computer disk drives; control loops; decoupled-design strategy; dual-stage actuator servo design; estimation scheme; feedback loop; low-order dual-stage actuator controller; magnetic disk drives; single-stage controller; track seeking; zero-phase error tracking controller; Actuators; Analytical models; Computer errors; Control systems; Disk drives; Error correction; Feedback loop; Performance analysis; Servomechanisms; Tracking loops;
Journal_Title :
Control Systems Technology, IEEE Transactions on
DOI :
10.1109/TCST.2003.819591