Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1975-11-20
1977-02-15
Dobeck, Benjamin
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318345R, H02P 700
Patent
active
040084264
ABSTRACT:
A miniature DC motor is connected to a DC source through a PNP type driving transistor. The back electromotive force of the motor which is proportional to the speed is applied to the base electrode of an NPN type control transistor through a variable resistor and the output of the control transistor is applied to the base electrode of the driving transistor through an NPN type amplifier transistor. A capacitor is connected between the base and emitter electrodes of the control transistor for smoothing the voltage applied to the base electrode of the control transistor. The sensitivity of the speed control system can be improved by connecting a Zener diode in the input circuit to the control transistor. Further the effect of the variation in the ambient temperature can be compensated for by using a thermister.
REFERENCES:
patent: 3335350 (1967-08-01), Persson
patent: 3422231 (1969-01-01), Kearns
patent: 3777244 (1973-12-01), Kosaka
patent: 3838324 (1974-09-01), Watanabe
Dobeck Benjamin
Jeco Co., Ltd.
Pfund Charles E.
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