Technique to compensate for resonances and disturbances on...

Details Technique to compensate for resonances and disturbances on... Technique to compensate for resonances and disturbances on...

2005-08-23

2005-08-23

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

06934117

ABSTRACT:
A control system for an actuator arm assembly of a hard disk drive reduces the Non-Repeatable Run-out (NRRO) caused from external sources exciting higher-frequency actuator arm assembly modes. The actuator arm assembly includes a primary actuator and a secondary actuator. The control system includes a primary control loop controlling the primary actuator and a secondary control loop controlling the secondary actuator. The secondary control loop includes at least one peak filter at a frequency corresponding to at least one frequency that is greater in frequency than the primary mode of the actuator arm assembly. The primary actuator can be any type of primary actuator. Similarly, the secondary actuator can be any type of actuator that is located between the primary actuator and a read/write head.

REFERENCES:
patent: 6064540 (2000-05-01), Huang et al.
patent: 6339512 (2002-01-01), Sri-Jayantha et al.
patent: 6487028 (2002-11-01), Sri-Jayantha et al.
patent: 6583964 (2003-06-01), Huang et al.
Daniel Wu, Guoxiao Guo Midfrequency Disturbance Suppression via Micro-Actuator in Dual-Stage HDDs IEE vol. 38, No. 5.

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