Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1974-09-13
1976-03-23
Rubinson, Gene Z.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318230, 318231, 318314, H02P 540
Patent
active
039462935
ABSTRACT:
An induction motor is coupled to a three-phase AC source through thyristors controlled by a digital control circuit. An adjustable device gates a selected number of clock pulses to a control counter. As one of the AC phases goes positive, the control counter is incremented or decremented by clock pulses until reaching a predetermined count, which causes a trigger means to generate a trigger pulse and fire a thyristor. The trigger pulse also gates clock pulses to a second control counter which counts to 120.degree. and 240.degree. representing numbers in order to fire the other thyristors. In a speed feedback embodiment, rotation of the motor generates a motor feedback signal which is compared with a desired speed signal to adjust the count of an up/down counter, the contents of which are loaded into the control counter.
REFERENCES:
patent: 3470447 (1969-09-01), Gyugyi et al.
patent: 3665273 (1972-05-01), Enslin
patent: 3703672 (1972-11-01), Bird et al.
patent: 3816808 (1974-06-01), Enslin et al.
Conco Inc.
Rubinson Gene Z.
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