Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1994-11-30
1997-01-07
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 75, G11B 1546, G11B 2102
Patent
active
055923453
ABSTRACT:
The invention is used in a disk drive and comprises a feedforward circuit connected between the head position circuit and the speed control loop circuit. The feedforward circuit precompensates the speed control loop for changes in rotation drag due to movements in the head of a disk drive. The feedforward circuit may include one or more deadband amplifiers and may include filter circuit. The invention disclose the method for controlling the speed of a spindle motor in a disk drive which includes the step of precompensating the speed control loop circuit with a processed head positioning signal.
REFERENCES:
patent: 4669004 (1987-05-01), Moon et al.
patent: 4789975 (1988-12-01), Taniyama
patent: 5126689 (1992-06-01), Nakamura
patent: 5184257 (1993-02-01), Koga et al.
patent: 5204594 (1993-04-01), Carobolante
patent: 5301072 (1994-04-01), Wilson
patent: 5473230 (1995-12-01), Dann et al.
Carobolante Francesco
Cerato Sandro
Arrambide Joseph C.
Galanthay Theodore E.
Groover Robert
Neal Regina Y.
Psitos Aristotelis
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