Digital servo system using microcomputer for controlling phase a

Details Digital servo system using microcomputer for controlling phase a Digital servo system using microcomputer for controlling phase a

1988-02-08

1989-12-05

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388912, 360 7301, G05B 500

Patent

active

048857939

ABSTRACT:
A microcomputer (20) servo controls the rotational speed and the rotational phase of a cylinder motor (37) of a VTR in a digital manner. The microcomputer (20) generates a 10-bit digital phase error signal D.sub.PH having sufficiently low conversion gain and a 10-bit digital speed error signal D.sub.SP having sufficiently low conversion gain in response to an FG signal generated with rotation of a cylinder motor. The digital phase error signal D.sub.PH and the digital speed error signal D.sub.SP are added to each other in a digital manner in the addition ratio 1:8. In addition, the result of this addition is amplified four times in a digital manner by extracting eight lower order bits thereof and then converted into an analogue signal and supplied to the cylinder motor as a servo control signal. Thus, since the error signals are added to each other in a digital manner and then, the added signal is amplified as required, a digital servo having a large capture range can be achieved as whole.

REFERENCES:
patent: 4297733 (1981-10-01), Sanderson
patent: 4531158 (1985-07-01), Murakami et al.
patent: 4536806 (1985-08-01), Louth
patent: 4584507 (1986-04-01), Taylor
patent: 4668900 (1987-05-01), Tabuchi

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