Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-04-02
1999-10-19
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 75, G11B 5596
Patent
active
059698993
ABSTRACT:
An enhanced method and system for unloading magnetic heads are disclosed. The system limits the maximum and minimum speed of the actuator while unloading the heads during a power failure. A BEMF control circuit monitors the velocity of the actuator using the BEMF of the actuator as a gauge of the velocity. The BEMF control circuit uses a sense resistor to remove the inherent resistive component of the actuator from its BEMF measurement. If the velocity of the actuator increases above a safe level the BEMF control circuit decreases actuator current to prevent further acceleration. If the velocity of the actuator decreases below a safe level the BEMF control circuit increases the actuator current to accelerate the actuator to a safe level.
REFERENCES:
patent: 4237501 (1980-12-01), Barmache et al.
patent: 4358728 (1982-11-01), Hashimoto
patent: 5495156 (1996-02-01), Wilson et al.
Andrews, Jr. Thomas L.
Hunter Dan A.
Jones James M.
Utenick Michael R.
Davidson Dan I.
Heid David W.
Mobile Storage Technology Inc.
Psitos Aristotelis M.
Samsung Electronics Co,. Ltd.
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