Actuator access control system for a magnetic head using trapezo

Details Actuator access control system for a magnetic head using trapezo Actuator access control system for a magnetic head using trapezo

1986-11-24

1989-01-03

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, G11B 555

Patent

active

047961120

ABSTRACT:
An actuator which carries a magnetic head of a disk memory seeks a track on the disk by being actuated by a pair of trapezoidal drive currents, which have no or less power spectrum at the frequency coinciding with the mechanical resonance frequency of the positioning mechanisms. A trapezoidal waveform whose ratio of an upper side to a bottom side is adjusted depending on seek stroke. The mechanical resonance frequency may be within the range of the power spectrum of the trapezoidal drive currents so long as it coincides with the characteristic frequency with a zero power spectrum. A constant velocity region which has no current flowing into the actuator between the first positive trapezoidal current and the second negative trapezoidal current is provided when the seek stroke is long.

REFERENCES:
patent: 3798427 (1974-03-01), Conners
patent: 3828236 (1974-08-01), Close
patent: 4342378 (1982-08-01), Hmelovsky

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