Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1987-09-16
1989-05-30
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7804, 318561, 318687, G11B 2108, G11B 555
Patent
active
048356336
ABSTRACT:
A data recording disk file with a voice coil motor (VCM) actuator and a digital servo control system for positioning the read/write heads to selected concentric data tracks includes means for calculating the factor relating acceleration of the heads to VCM input current. This permits each disk file to compensate for any variation in the nominal VCM physical parameters, thus enabling VCMs to be manufactured to less demanding tolerances. The disk file also calculates a unique acceleration factor for each head position during movement of the heads from one track to another, thereby improving the arrival time of the heads to the target track. During an initialization procedure, the disk file performs a track seek, during which VCM current and head velocity information are acquired and used by the microprocessor in the digital servo control system to calculate a value representing an average actual acceleration factor unique to that disk file. This value, together with predetermined constants representing the characteristic relationship of acceleration factor to head position in a disk file with a nominal VCM, are used by the microprocessor to calculate the actual acceleration factor for each head position during a track seek.
REFERENCES:
patent: 4679103 (1987-07-01), Workman
patent: 4697127 (1987-09-01), Stich et al.
Digital Control of Dynamic Systems, Franklin and Powell, Addison-Wesley Publishing Co. (1983) Chapter 6, pp. 131-139.
Edel Stephen F.
Workman Michael L.
Yamamoto Kenneth G.
Yu Mantle M. H.
Berthold Thomas R.
Faber Alan
Garland Steven R.
International Business Machines - Corporation
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