Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1996-12-18
2000-05-23
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 48, 360 51, 318254, 318439, G11B 1546, G11B 509, H02K 2300, H01R 3946
Patent
active
060672021
ABSTRACT:
A method and apparatus for controlling a spindle motor having at least one winding in a storage device are proposed, the storage device having at least one data storage medium rotatably supported by the spindle motor and having a plurality of tracks on each surface thereof including data regions and nondata regions, and a transducer assembly for selectively positioning a transducer over each data storage surface of the storage medium for reading and writing of information stored on the medium. The method and apparatus control rotation of the spindle motor by providing a voltage waveform to each winding at selected switching times during each rotation such that switching does not occur while the head is positioned over data. In a first embodiment, switching during nondata regions is assured by setting the switch points to coincide in time with a fixed data storage surface format. Alternatively, the data storage surface is written with servo sectors to coincide in time with preselected switch points. In a third embodiment, the time for switching is advanced or delayed until the transducer is located over a nondata region near to the nominal switching point by providing a processor executing control code and a delay circuit for delaying switching from a zero-crossing in the spindle motor control circuit. Optional enhancements are also presented.
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IBM TDB Article, vol. 32., No. 5B, Oct. 1989, "Phase Error Detect Logic for Disk File Speed Control".
Rowan Bryan Scott
Yu Mantle Man-Hon
International Business Machines - Corporation
Neal Regina Y.
Psitos Aristotelis M.
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