Speed control system for DC motor

Electricity: motive power systems – Braking – Automatic and/or with time-delay means

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318331, H02P 7285

Patent

active

047884789

ABSTRACT:
A speed control system for a DC motor is disclosed. This system includes a first transistor connected between a first terminal and a reference terminal, a second transistor connected between a second terminal and the reference terminal, an error amplifier having first input terminal connected via a reference voltage circuit to the first terminal, a second input terminal connected to a third terminal and an output terminal connected to the bases of the first and second transistors, a first resistor connected between a power terminal and the second terminal, a second resistor connected between the first and third terminals, and a third resistor connected between the second and third terminals, and the motor is connected between the first terminal and the power terminal.

REFERENCES:
patent: 4547715 (1985-10-01), Li

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