Method of avoiding resonance in servo controlled apparatus

Details Method of avoiding resonance in servo controlled apparatus Method of avoiding resonance in servo controlled apparatus

1981-04-28

1983-08-09

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 78, G11B 2110

Patent

active

043982280

ABSTRACT:
An improved disk drive for storage of digital data is disclosed featuring a servo circuit used to drive the read/write head back and forth with respect to the media, the motion of the head being controlled by a servo circuit reading position signal data from the disk. The position data is stored in a sample and hold circuit having a transfer function dropping to a minimum value at the sampling rate; by choosing the resonant frequency of the head and servo apparatus assembly to be substantially equal to the sampling frequency, the mechanical resonance appearing in the system is effectively damped out.

REFERENCES:
patent: 3122687 (1964-02-01), Romvari
patent: 4168457 (1979-09-01), Rose
patent: 4268785 (1981-05-01), Svendsen
patent: 4321517 (1982-03-01), Touchton et al.
IEE Transactions on Magnetics, F. A. Samuels, Beyond the Second Order System in Track Following Servos, vol. Mag.-14, No. 4, Jul. 1978, pp. 178-181.
IBM TDB, R. S. Palmer, Automatic Notch Frequency Control for Servo Stabilization, vol. 19, No. 10, Mar. 1977, pp. 3860-3862.

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