Electricity: motive power systems – Positional servo systems – Adaptive or optimizing systems including 'bang-bang' servos
Patent
1974-10-17
1976-07-13
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Adaptive or optimizing systems including 'bang-bang' servos
318603, 318618, 318374, H02P 104
Patent
active
039696634
ABSTRACT:
A control system for precisely locating a tape upon deceleration thereof from a transport velocity to rest. A signal is generated which represents the distance traversed by the tape subsequent to an identified event. The signal is compared with a reference signal representing a desired distance-versus-time characteristic, and the error signal thus given rise to is used to either "plug" or dynamic brake the motor to control the stopping distance. Final position control logic produces and additional enabling signal should the tape overrun its desired position, and causes the motor to reverse to reposition the tape. In a preferred embodiment, a current limit circuit monitors current through the drive motor, and intermittently disables a portion of the drive circuit in response to a sensed overcurrent condition.
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patent: 3412307 (1968-11-01), Welsh
patent: 3435310 (1969-03-01), Bradley
patent: 3435314 (1969-03-01), Bradley et al.
patent: 3500163 (1970-03-01), Moritz
patent: 3644806 (1972-02-01), Belson et al.
patent: 3721882 (1973-03-01), Helms
patent: 3728565 (1973-04-01), O'Callaghan
patent: 3737751 (1973-06-01), Lima
patent: 3764876 (1973-10-01), Arthur
patent: 3809335 (1974-05-01), Mantey
patent: 3836833 (1974-09-01), Harris et al.
Arthur William C.
Steger William W.
Dobeck B.
Storage Technology Corporation
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