Solid state motor control circuit providing a dynamic braking fu

Details Solid state motor control circuit providing a dynamic braking fu Solid state motor control circuit providing a dynamic braking fu

1979-02-15

1980-08-05

Truhe, J. V.

Electricity: motive power systems

Positional servo systems

With stabilizing features

318625, G05B 501

Patent

active

042164222

ABSTRACT:
A solid state motor control circuit for controlling the operation of a servo motor comprises a comparator circuit including a differential amplifier having its inputs connected across terminals of the motor and having its output connected to a drive circuit the output of which is connected to a supply terminal of the motor. A reference circuit maintains a reference terminal of the motor at a reference level, and in the absence of a command signal, the differential amplifier and drive circuit maintain the voltage at the motor supply terminal at the reference level. A control switch enabled by the command signal applies a control signal to an input of the differential amplifier, and the differential amplifier responsively enables the drive circuit to raise or lower the potential at the motor supply terminal relative to the reference level, thereby energizing the motor. Upon termination of the command signal, the control switch is disabled, removing the control signal from the input of the differential amplifier and through negative feedback, the differential amplifier and drive circuit return the voltage at the motor supply terminal to the reference level, approximating a dynamic braking function for stopping the motor.

REFERENCES:
patent: 3548283 (1970-12-01), Krohn
patent: 3906299 (1975-09-01), Mittelstaedt
patent: 3976925 (1976-08-01), Rudich, Jr.
Fishman, Electronic Design, vol. 24, No. 10, p. 110, May 10, 1976.

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