Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1985-12-06
1987-01-27
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 77, G11B 1928
Patent
active
046397981
ABSTRACT:
A disk drive storage device employs two control subsystems, one for transducer position digital control and the other to control and precisely regulate spindle motor angular velocity in accordance with a crystal reference and a speed correction made at least once each revolution. A single servo sector on a data surface provides prerecorded track centering information. Overall electromechanical operations during track following activities are synchronized by the crystal controlled disk spindle motor subsystem which locates the position in time and space of the servo sector and which also interrupts program execution of the transducer position digital control subsystem and causes it to execute a subroutine for track centerline position correction. Direct digital commutation of the brushless DC spindle motor by a programmed digital microprocessor is an aspect of the present invention.
REFERENCES:
patent: 3900796 (1975-08-01), Rose
patent: 4146910 (1979-03-01), Oliver et al.
patent: 4420715 (1983-12-01), Lecourtier et al.
patent: 4492992 (1985-01-01), Rooney et al.
patent: 4524399 (1985-06-01), Jepsen
patent: 4538099 (1985-08-01), Moon
Condito Vincent A.
Graham Randolph H.
Harrison Joel N.
Nixon Brian J.
Simonsen Richard C.
Harrison David B.
Quantum Corporation
Stellar George G.
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