Electricity: motive power systems – Positional servo systems – Adaptive or optimizing systems including 'bang-bang' servos
Patent
1976-12-23
1979-09-04
Truhe, J. V.
Electricity: motive power systems
Positional servo systems
Adaptive or optimizing systems including 'bang-bang' servos
318594, 360 78, G05B 1300
Patent
active
041669703
ABSTRACT:
A read/write head moves relative to magnetic discs having track addresses corded thereon in Gray code in a plurality of reference zones. The head is moved by an electric motor and reads information as the head is shifted from a starting track to a destination track. The address of the destination track is expressed in weighted, i.e., standard, binary code, and is stored in a register. The address of the head is read by a read element of the head from the recording tracks. In response to the initial and destination tracks, an intermediate track C, approximately halfway between the initial and destination tracks, is calculated. The head is accelerated from the initial track to the intermediate track by feeding a motor for driving the head with a constant current. In response to the head detecting the address of the intermediate track, the current supplied to the motor is reversed so that the head is decelerated. The calculations and comparisons are performed in the weighted, binary code. The reverse polarity current is applied to the motor until the speed of the head, as determined exclusively in response to addresses read by the head, is lower than a minimum threshold. In response to the speed of the head being detected as less than the minimum threshold, the flow of current to the motor is cut off, at which time the address of the track is compared with the destination track. In response to these two addresses differing, the sequence of steps is repeated.
REFERENCES:
patent: 3584284 (1971-06-01), Beach et al.
patent: 3668494 (1972-06-01), Agin
patent: 3731177 (1973-05-01), Commander et al.
patent: 3737751 (1973-06-01), Lima
patent: 3855513 (1974-12-01), Brunner
patent: 3895277 (1975-07-01), Klumpp
patent: 4027338 (1977-05-01), Kril
Cardot Claude R.
Democrate Gerard E.
Droux Jacques P.
Oisel Andre J.
Prival Guy
Compagnie Internationale pour l'Information Cii Honeywell Bull
Indyk Eugene S.
Truhe J. V.
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