Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Reexamination Certificate
2007-04-24
2007-04-24
Nguyen, Hoa T. (Department: 2627)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
Reexamination Certificate
active
10633095
ABSTRACT:
A disk drive is disclosed comprising a voice coil motor (VCM) driven in a PWM mode using model reference current feedback. The PWM circuitry and VCM form a plant transfer function which varies with changes to the plant characteristics, such as the resistance of the voice coil fluctuating with temperature drift. A plant model having a model transfer function generates an estimated state of the VCM in response to a detected current flowing through the voice coil. A correction block, responsive to the detected current, adjusts PWM timing signals so that the plant transfer function substantially matches the model transfer function.
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Blouin Mark
Nguyen Hoa T.
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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