Control apparatus for an electro-mechanical device that generate

Details Control apparatus for an electro-mechanical device that generate Control apparatus for an electro-mechanical device that generate

1981-05-14

1983-07-19

Weldon, Ulysses

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318331, 318343, H02P 122

Patent

active

043946046

ABSTRACT:
A transistor having an emitter collector path connected in series with a d.c. power supply and a d.c. motor that derives a back emf as a function of motor speed is controlled so current selectively flows from the power supply through the transistor emitter collector path to the motor to drive the motor at differing speeds. The back emf of the motor has a tendency to become excessive for the transistor emitter collector path as the motor speed increases. The voltage of the supply is increased as the back emf increases to prevent the back emf from becoming excessive for the emitter collector path. A control source for the back emf is programmed in accordance with known speed and back emf characteristics of the motor as a function of time. The power supply voltage is increased and decreased in steps in response to variations of the programmed control source being above or below a threshold.

REFERENCES:
patent: 3343073 (1967-09-01), Mesenhimer
patent: 3396323 (1968-08-01), Auld
patent: 3412306 (1968-11-01), Fischer
patent: 3459957 (1969-08-01), Kelley
patent: 3624474 (1971-11-01), Nolf
patent: 3710213 (1973-01-01), Hansen
patent: 4078194 (1978-03-01), Johnson, Jr.
patent: 4112340 (1978-09-01), Clarke

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