Variable speed AC motor control circuit

Details Variable speed AC motor control circuit Variable speed AC motor control circuit

1976-06-28

1978-03-14

Dobeck, B.

Electricity: motive power systems

With particular motor-driven load device

Tension-maintaining type of motor-control system

318 56, 318 60, 318 86, 318227, H02P 156

Patent

active

040792960

ABSTRACT:
A microfilm reader has a film transport mechanism driven by separate forward and reverse motors. During operation, the driven one of the motors receives full AC power for driving it at high speed. During low speed operation, the driven motor receives partial power during half-cycles of one polarity, but only minimal power during half-cycles of opposite polarity. The undriven motor is pulled by its associated reel as the film is unwound therefrom. A large capacitor, which is part of a series circuit including both the forward and reverse motors, charges while either motor runs. When a driven motor is stopped, the capacitor is discharged into both of the motors to provide a unipolar field which produces a braking torque. Thus, the capacitor discharge not only stops the driven motor quickly and efficiently, but also stops the undriven motor to maintain film tension.

REFERENCES:
patent: 3218529 (1965-11-01), Evans et al.
patent: 3444445 (1969-05-01), Mullin
patent: 3531703 (1970-09-01), Plumpe, Jr.
patent: 3758834 (1973-09-01), Inoue
patent: 3794898 (1974-02-01), Gross

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