Title :
Discrete-time LQG/LTR dual-stage controller design in magnetic disk drives
Author :
Suh, Sang-Min ; Chung, Chung Choo ; Lee, Seung-Hi
Author_Institution :
Div. of Electr. & Comput. Eng., Hanyang Univ., Seoul, South Korea
fDate :
7/1/2001 12:00:00 AM
Abstract :
This paper presents a new dual feedback loop controller design of a dual-stage actuator for hard disk drives. For precise and accurate displacement, coupled dynamic model is considered from the Newton-Euler formulation. A gain factor is introduced so that the level of microactuator´s contribution and the high frequency characteristics of the system can be controlled. 2.28 kHz servo bandwidth is achieved. The 6 percent settling time is 250 μs and 3σ value is 0.017 μm from the experimental result
Keywords :
disc drives; discrete time systems; feedback; hard discs; linear quadratic Gaussian control; microactuators; piezoelectric actuators; servomechanisms; 2.28 kHz; Newton-Euler method; coupled dynamic model; discrete-time LQG/LTR dual-stage controller design; dual-feedback loop controller; gain factor; hard disk drive; high-frequency characteristics; piezoelectric microactuator; servo bandwidth; settling time; Actuators; Bandwidth; Control systems; Disk drives; Feedback loop; Frequency; Microactuators; Servomechanisms; Sliding mode control; Transient response;
Journal_Title :
Magnetics, IEEE Transactions on
