Head position control method, head position control device,...

Details Head position control method, head position control device,... Head position control method, head position control device,...

2007-09-04

2007-09-04

Tzeng, Fred F. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

11362601

ABSTRACT:
A position control device corrects the displacement of the head by disturbance applied to the disk device by the control system. An adaptive control to an unknown disturbance frequency is performed. The frequency estimation block for estimating the external vibration frequency from a signal that is based on the position error according to the adaptive rule, and a correction table for sequentially correcting the constants of the compensator using this external vibration frequency, are provided. Since the constants of the compensator are sequentially corrected according to the estimated angular frequency, highly accurate follow up control to an external vibration frequency in a wide range becomes possible.

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Brown et al.; “Control for Canceling Periodic Disturbances with Uncertain Frequency”; Proceedings for the 40thIEEE Conference on Decision and Control; pp. 4909-4914; Dec. 2001.
Masashi Kisaka; “Frequency Chasing Peak Filter”; Institute of Electrical Engineers of Japan; Technical Meeting on Industrial Instrumentation and Control; pp. 19-23; Sep. 10, 2004.

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