Synchronized spindle control in disk drives with at least two da

Details Synchronized spindle control in disk drives with at least two da Synchronized spindle control in disk drives with at least two da

1994-12-20

1996-09-10

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

318 85, G11B 2722

Patent

active

055551408

ABSTRACT:
In order to bring and keep a slave phase of rotation of a slave spindle into and in synchronism with a master phase, the master phase is represented in a predetermined time duration by zeroth through (N-1)-th master region data with an N-th master region datum added, where N represents a predetermined integer which is not less than two. The slave phase is represented, during one rotation of the slave spindle, by zeroth through (N-1)-th slave region data with an N-th slave region datum additionally used to provide a guard time. The zeroth through the (N-1)-th slave and master region data are compared to render a phase difference between the master and the slave phases either to zero or to a predetermined value. Alternatively, the master phase is represented in the predetermined time duration by a sequence of composite pulses which comprise N master clock pulses with at least one of the clock pulses omitted to indicate a start point of the sequence. The slave phase is represented, during one rotation of the slave spindle, by a combination of N slave clock pulses and a slave index signal. As a further alternative, the master phase is represented by a combination of the N master clock pulses without omission and a master index signal produced once in the predetermined time duration.

REFERENCES:
patent: 4890045 (1989-12-01), Ishizuka
patent: 4907105 (1990-03-01), Kurzweil, Jr.
patent: 5237466 (1993-08-01), Glaser et al.
Chiang "Multirate State-space Digital Controller For Sector Servo Systems", Proceedings of the 29th Conference on Decisions and Control (IEEE) Dec. 1990.

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