Electricity: motive power systems – Positional servo systems
Patent
1980-09-11
1983-05-10
Truhe, J. V.
Electricity: motive power systems
Positional servo systems
318561, 318568, G05B 1300, G05B 1302, G05B 602
Patent
active
043832075
ABSTRACT:
A head is shifted relative to a magnetic disc for recorded information carried by plural concentric recording tracks on the disc. Addresses of the tracks are recorded on and read by a head from plural reference zones on the disc. The head is shifted from a starting track A to a destination track B by an electric motor. The motor is controlled so the head is accelerated from track A to track C and the head is decelerated when it reaches track C; track C being between tracks A and B. The motor is controlled by calculating an acceleration instruction for the head in response to addresses read by the head and by measuring the head acceleration. The instruction and measured accelerations are combined to derive an error indication that controls the motor.
REFERENCES:
patent: 3554980 (1970-12-01), Applequist et al.
patent: 3629560 (1971-12-01), Slanson
patent: 4030132 (1977-01-01), Iftikar et al.
patent: 4031443 (1977-06-01), Droux et al.
patent: 4166970 (1979-09-01), Cardot et al.
patent: 4200827 (1980-04-01), Oswald et al.
Hewlett-Packard Journal, vol. 23, 1972, pp. 6-11.
IBM Techical Disclosure Bulletin, vol. 9, pp. 1694-1695, and 1884.
CII-Honeywell Bull
Evans A.
Truhe J. V.
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