Disk drive with adaptive control of periodic disturbances

Details Disk drive with adaptive control of periodic disturbances Disk drive with adaptive control of periodic disturbances

2006-12-05

2006-12-05

Nguyen, Hoa Thi (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07145746

ABSTRACT:
A disk drive, such as a magnetic recording hard disk drive, has a head positioning servo control system that includes an improved repetitive controller included with the conventional feedback controller for suppressing periodic disturbances. The repetitive controller includes a low-pass filter (LPF) and a time-delay memory with a time delay matched to the period of the periodic disturbance. In a digital implementation, where the head position error signal (PES) is sampled, the time delay is the time for N samples. A subsequent PES sample is summed with the time-delay input sample from N samples earlier and this summed value is input to the LPF. The output of the LPF is added to the subsequent PES sample and the added value is input to the feedback controller. The value of N is adjustable, so the repetitive controller is adaptable to changes in frequency of the periodic disturbance.

REFERENCES:
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patent: 2000076806 (2000-03-01), None
Tzou et al., “Adaptive Repetitive Control of PWM Inverters for Very Low TH DAC-Voltage Regulation with Unknown Loads”, IEEE Trans. on Power Electronics, vol. 14, No. 5, pp. 973-998.
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Cao et al., “Adaptive Repetitive Control to Track Variable Periodic Signals With Fixed Sampling Rate”, IEEE/ASME Trans. on Mechatronics, vol. 7, No. 3, pp. 378-384, 2002.

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