Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1974-11-13
1976-01-06
Dobeck, B.
Electricity: motive power systems
Limitation of motor load, current, torque or force
318474, 318476, 317 13R, H02P 774
Patent
active
039315576
ABSTRACT:
A series of electrical signals of a frequency directly proportional to the speed of a motor controlled by a speed control circuit of the type which completes an energizing circuit for the motor through the current carrying electrodes of a switching transistor is generated. These signals are employed to produce a direct current reference potential signal which increases rapidly in magnitude when the motor becomes stalled. The reference potential signal is applied across the series combination of a Zener diode and the base-emitter electrodes of an NPN transistor for supplying base-emitter drive current to the transistor when the potential level thereof reaches a magnitude equal to the inverse breakdown potential of the Zener diode. The collector-emitter electrodes of the NPN transistor are connected in circuit with the motor speed control circuit in such a manner that the control circuit switching transistor is maintained not conductive while base-emitter drive current is supplied to the NPN transistor.
REFERENCES:
patent: 3383561 (1968-05-01), Thiele
patent: 3427506 (1969-02-01), Thiele
patent: 3551775 (1968-09-01), Safiuddin
patent: 3569810 (1971-03-01), Thiele
patent: 3576485 (1971-04-01), Coons, Jr.
Dobeck B.
General Motors Corporation
Stahr Richard G.
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