Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1995-05-10
1997-12-16
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7806, 360 7814, 31856818, G11B 5596
Patent
active
056992076
ABSTRACT:
A sliding mode controller for controlling a read/write head actuator in a magnetic disk drive storage system wherein a voice coil motor connected to the actuator operates to adjust the position of the read/write head over a selected data track recorded on a magnetic medium. The sliding mode controller comprises a technique for reducing chatter associated with the inherent operation of such a controller--rapid switching between gains to force the observable phase states to follow a predetermined phase state trajectory. While tracking the centerline of a selected track, the sliding mode controller generates a motor control command by multiplying an actuator position error and an actuator position error velocity by respective switching gains. When seeking to a new track, the controller reduces switching noise by disabling the actuator position error and generating the motor control signal responsive to the actuator position error velocity alone. The sliding mode controller further comprises an integrator for integrating the actuator position error during tracking in order to compensate for biasing forces that can cause a DC offset from the selected track's centerline.
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Romano Paul M.
Supino Louis
Cirrus Logic Inc.
Cullen Larry T.
Psitos Aristotelis M.
Sheerin Howard H.
Shifrin Dan A.
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