Servo positioning error control for magnetic disk file
AssigneeControl Data Corporation
InventorsEdward Kevin Dahill, Ronald Bruce Howes, Jr.
Life of this patent
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Abstract
In a magnetic disk file head positioning control system, the servo loop controlling the fine positioning of magnetic heads for a particular head track is responsive to a servo error signal. The servo error signal consists of a low pass filtered head position error signal summed with a pseudo velocity signal derived from the same head position error signal.
Claims6
In a magnetic disk memory storage system comprising a head assembly for use with a disk pack having at least one record disk and a servo track disk, an actuator assembly for said head assembly, and means for developing a head position error signal from signals received from said head assembly, the improvement comprising a servo error control for developing signals to control said actuator from signals received from said means for developing a head position error signal:
- means for receiving head position error signals from said means for developing a head position error signal,
- means, connected with said means for receiving, for providing a low pass filter signal as an output signal,
- means, connected with said means for receiving, for inverting said head position error signals to produce an inverted head position error signal,
- means, connected with said means for inverting, for integrating said inverted head position error signal to produce a pseudo velocity signal, and
- means, connected with said means for integrating and with said means for providing a low pass filter signal, for summing said pseudo velocity signal and said low pass filter signal in a predetermined proportion as an output signal adapted to control said actuator.
Dependencies are inferred from the claim text.