Seeking Control of Hard Disk Drive by Perfect Tracking Using Multirate Sampling Control

In this paper, novel multirate two-degree-of-freedom controllers are proposed for digital control systems, where it is restricted that the speed of the A/D converters are slower than that of the D/A converters. The proposed feedforward controller assures the perfect tracking at M inter-sampling points. Next, the proposed method is extended to systems with time delay. The proposed scheme is applied to the seeking control for hard disk drive, and advantages of this approach are demonstrated.

[1]  Kevin L. Moore,et al.  Capabilities and limitations of multirate control schemes , 1993, Autom..

[2]  W.-W. Chiang,et al.  Multirate state-space digital controller for sector servo systems , 1990, 29th IEEE Conference on Decision and Control.

[3]  Atsuo Kawamura,et al.  High performance perfect tracking control based on multirate feedforward / feedback controllers with generalized sampling periods , 1999 .

[4]  Masayoshi Tomizuka,et al.  Zero Phase Error Tracking Algorithm for Digital Control , 1987 .

[5]  Hiroshi Fujimoto,et al.  Proposal of perfect tracking and perfect disturbance rejection control by multirate sampling and applications to hard disk drive control , 1999, Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304).

[6]  Masayoshi Tomizuka,et al.  Multirate estimation and control under time-varying data sampling with applications to information storage devices , 1995, Proceedings of 1995 American Control Conference - ACC'95.

[7]  Gene F. Franklin,et al.  Digital control of dynamic systems , 1980 .

[8]  Karl Johan Åström,et al.  Zeros of sampled systems , 1980, 1980 19th IEEE Conference on Decision and Control including the Symposium on Adaptive Processes.

[9]  Masayoshi Tomizuka,et al.  Performance enhancement of multi-rate controller for hard disk drives , 1999 .

[10]  Masayoshi Tomizuka,et al.  Two-degree-of-freedom control with robust feedback control for hard disk servo systems , 1999 .

[11]  Atsuo Kawamura,et al.  Perfect tracking digital motion control based on two-degree-of-freedom multirate feedforward control , 1998, AMC'98 - Coimbra. 1998 5th International Workshop on Advanced Motion Control. Proceedings (Cat. No.98TH8354).

[12]  K. Åström,et al.  Zeros of sampled systems , 1980 .