Control circuit for a DC motor

Details Control circuit for a DC motor Control circuit for a DC motor

1992-01-16

1993-06-15

Ro, Bentsu

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Analog armature control

318459, 3889281, H02P 118, H02P 308

Patent

active

052206343

ABSTRACT:
A DC power supply for a DC motor is controlled by a drive transistor. An "ON" state of the drive transistor is maintained by a comparator which compares a terminal voltage at a point between the DC motor and the drive transistor with a reference voltage supplied from the power supply. A clock pulse is applied to the drive transistor to make it periodically turn off in order to detect an induced voltage depending upon the rotation rate of the DC motor. The drive transistor returns to turn off upon stopping the rotating DC motor by force.
A regulator is provided between the power supply and the reference voltage. A restraint torque and a rotation rate control means are also provided.
Alternatively, a pulsating power supply is provided instead of the DC power supply and the clock.

REFERENCES:
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 3924166 (1975-12-01), Doeman
patent: 4233549 (1980-11-01), Dighe
patent: 4479077 (1984-10-01), Kemmel et al.
patent: 4494057 (1985-01-01), Hotta
patent: 4611154 (1986-09-01), Lambropoulos et al.
patent: 4633153 (1986-12-01), Thornton et al.
patent: 4905300 (1990-02-01), Bhagwat et al.
patent: 5051672 (1991-09-01), Yaguchi
patent: 5097186 (1992-03-01), Kokubu

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