Digital servo system for controlling rotational speed of rotary

Details Digital servo system for controlling rotational speed of rotary Digital servo system for controlling rotational speed of rotary

1989-12-14

1991-02-19

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

318608, 318603, 388810, G05B 1918

Patent

active

049947230

ABSTRACT:
A microcomputer 1 servo controls a rotational speed of a capstan motor 10 in a VTR in a digital manner. A value of a timer counter 6 is stored in an ICR 7 at a timing of each edge of FG signal pulses generated as the capstan motor rotates. Thereafter, in the microcomputer 1, a FG interrupt processing is carried out corresponding to the value of ICR 7. More specifically, the microcomputer 1 alternately measures a first period from a rise of one pulse of the FG signal to a rise of a subsequent pulse thereof and a second period from a fall of one pulse to a fall of a subsequent pulse to determine an amplitude of a speed error signal based on these periods. Therefore, a sampling frequency for the digital servo control can be double that of a prior art.

REFERENCES:
patent: 4584507 (1986-04-01), Taylor
patent: 4668900 (1987-05-01), Tabuchi
patent: 4879754 (1989-11-01), Tadashi
patent: 4885793 (1989-12-01), Tabuchi

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