Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Mechanically coupled in fixed ratio of movement
Patent
1981-07-20
1982-08-24
Dobeck, B.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Mechanically coupled in fixed ratio of movement
11212112, 318 85, 318654, G05B 106
Patent
active
043463347
ABSTRACT:
An automatic motion or position control DC servomotor system in which a load-driving axis driven by a DC motor to be controlled in one rotary mechanism is rotated synchronously with, or following the rotation of, a reference axis manually operated or driven by another DC motor. The system comprises a position signal generator producing first sine- and cosine-wave signals corresponding to an angle of rotation of the controlled load-driving axis; a command signal generator producing second sine- and cosine-wave signals corresponding to an angle of rotation of the reference axis; an arithmetic unit processing the first and second sine- and cosine-wave signals and providing a sine-wave feedback voltage output signal; and a driver circuit amplifying the feedback voltage signal and providing a thus amplified signal to the DC motor driving the load-driving axis. When the reference axis is driven by another DC motor, the command signal generator may be a second position signal generator. The command signal and position signal generators each consists of a combination which preferably comprises a sine-cosine potentiometer. The DC servomotor system is suitably applicable to a sewing machine in such manner that the rotating hook shaft is driven by a first DC motor and the arm shaft by a second DC motor, the first DC motor being controlled synchronously with the second one under closed-loop feedback control as stated above.
REFERENCES:
patent: 3030564 (1962-04-01), Early et al.
patent: 3991350 (1976-11-01), Miyagoshi
patent: 4000449 (1976-12-01), Gripp
patent: 4093904 (1978-06-01), Burig et al.
patent: 4152994 (1979-05-01), Sugiyama
Brother Kogyo Kabushiki Kaisha
Dobeck B.
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