Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1983-06-13
1985-04-30
Weldon, Ulysses
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318345B, 318345F, H02P 122
Patent
active
045146683
ABSTRACT:
A D.C. motor driving circuit comprises a first transistor circuit comprising an initial stage transistor and a terminal stage transistor respectively connected in Darlington pairs, for supplying a current to a D.C. motor, coupled between the D.C. motor and a power source, a switching transistor coupled to the initial stage transistor of the first transistor circuit, and a second transistor circuit including a transistor coupled in parallel to the first transistor circuit, for supplying a current to the D.C. motor. The switching transistor is turned ON when applied with a driving signal voltage to put the first transistor circuit in an ON state. The current supplied to the D.C. motor decreases as a rotational speed thereof increases after starting of the D.C. motor. The first transistor circuit is turned OFF when the rotational speed of the D.C. motor reaches a speed near its constant normal rotational speed. The D.C. motor is supplied with the current from the second transistor circuit during constant normal rotation thereof.
REFERENCES:
patent: 3309597 (1967-03-01), Gabor et al.
patent: 3378699 (1968-04-01), Bruinsma et al.
patent: 3480849 (1969-11-01), Thornsen et al.
patent: 3496441 (1970-02-01), Heider et al.
patent: 3538353 (1970-11-01), Hanger
patent: 3706020 (1972-12-01), Klang
Victor Company of Japan Ltd.
Weldon Ulysses
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