Title :
Discrete-time LQG/LTR dual-stage controller design and implementation for high track density HDDs
Author :
Hu, Xiaoping ; Guo, Wei ; Huang, Tony ; Chen, Ben M.
Author_Institution :
Data Storage Inst., Nat. Univ. of Singapore, Singapore
Abstract :
This paper presents a LQG/LTR tracking servo design on a dual-stage actuator in hard disc drives (HDDs). The dual-stage actuator is considered as a multivariable plant rather than two independent actuators. Simulation and implementation results show that a bandwidth of 1.5 kHz is achieved. The settling time for step response is reduced to 0.6 ms. The track misregistration is reduced to 0.044 μm
Keywords :
actuators; control system synthesis; disc drives; discrete time systems; frequency response; hard discs; linear quadratic Gaussian control; multivariable control systems; position control; servomechanisms; step response; 0.6 ms; 1.5 kHz; discrete-time LQG/LTR dual-stage controller; dual-stage actuator; hard disc drives; high track density; multivariable plant; settling time; step response; track misregistration; tracking servo; Actuators; Bandwidth; Frequency estimation; Frequency measurement; Frequency response; Memory; Microactuators; Servomechanisms; State-space methods; Time factors;
Conference_Titel :
American Control Conference, 1999. Proceedings of the 1999
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-4990-3
DOI :
10.1109/ACC.1999.786317
