Correction of current feedback offset for disc drive servo syste

Details Correction of current feedback offset for disc drive servo syste Correction of current feedback offset for disc drive servo syste

1991-07-24

1994-07-12

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7309, 360 7804, 318368, G11B 5596, G11B 1546

Patent

active

053294092

ABSTRACT:
A process is provided for compensating for offset in the actuator current of the servo system of a disc drive. A typical disc drive includes a power amplifier providing actuator current to the actuator coil of the drive. A sensing resistor is responsive to the actuator current to provide a feedback signal representative of the magnitude of the actuator current, the feedback signal being provided to the power mechanism to derive the actual actuator current. By the present technique, offset in the actuator current is compensated by operating the transducer to move at predetermined constant velocities (for example, the maximum velocities) in first and second opposite directions across the surface of the disc and by measuring the resulting actual velocities. The feedback signal is adjusted based upon any difference between the actual velocities measured in the first and second directions.

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