Direct-current motor control

Details Direct-current motor control Direct-current motor control

1989-12-21

1991-12-31

Ro, Bentsu

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Analog armature control

388937, 318433, H02P 517

Patent

active

050778242

ABSTRACT:
A motor control circuit for controlling supply of electric power from a power source to an electric motor, in particular for use in electric power tools, comprising: an output power device for controlling supply of current to the motor according to a duty ratio of a control input signal supplied thereto; current detecting means for detecting an amplitude of an electric current supplied to the electric motor; and feedback means for supplying the control input signal to the output power device, the duty ratio of the input control signal being increased with an increase in the electric current supplied to the electric motor as detected by the current detecting means. Since the torque otuput of the motor is increased when such a need arises, the need for more a complex and expensive continually variable speed control system is eliminated.

REFERENCES:
patent: 3564372 (1971-02-01), Vogelsberg et al.
patent: 3947738 (1976-03-01), Oliver
patent: 4307326 (1981-12-01), Fukushima et al.
patent: 4458186 (1984-07-01), Kuriyama et al.
patent: 4503370 (1985-03-01), Cuneo
patent: 4719395 (1988-01-01), Aoi et al.
patent: 4885511 (1989-12-01), Millauer et al.
patent: 4949393 (1990-08-01), Ohmori et al.

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