Capstan speed control system

Details Capstan speed control system Capstan speed control system

1976-04-21

1978-03-07

Schaefer, Robert K.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318400, H02P 500

Patent

active

040781933

ABSTRACT:
A magnetic tape-transport system wherein the speed of a capstan used to transport magnetic tape past a read-write head is controlled utilizing digital techniques. A comparator is provided a first digital input indicative of desired speed and a second input from a counter which counts up or down until the count equals the first digital input. The counter output is converted to an analog voltage and applied to a summing junction point which also receives a voltage which is proportional to the instantaneous speed of the capstan drive motor. The voltage difference at the summing junction point is used to drive the capstan drive motor.

REFERENCES:
patent: 3706020 (1972-12-01), Klang
patent: 3859581 (1975-01-01), Gardner
patent: 3906319 (1975-09-01), Milligan

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