Four-quadrant current-regulated energization of D.C. motor using

Details Four-quadrant current-regulated energization of D.C. motor using Four-quadrant current-regulated energization of D.C. motor using

1977-12-01

1979-03-27

Goldberg, Gerald

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318332, 318345C, 363136, H02P 736

Patent

active

041468279

ABSTRACT:
First and second branches, each containing two thyristors in series, all four thyristors of same polarity, are connected across positive and negative supply lines, in turn connected to positive and negative terminals of D.C. voltage source. D.C. motor connected between junction of two thyristors in one branch and junction of two thyristors in other branch. One pair of diagonally opposite thyristors, or other pair of diagonally opposite thyristors, rendered conductive, for flow of motor current in respective first or second direction. First and second transistors respectively connected in positive and negative supply lines to permit and interrupt thyristor current flow. Selection of a thyristor pair for conduction occurs based on sense of motor-current error. The transistors and selected two thyristors rendered conductive and non-conductive by pulse-width-modulated actuating signal derived from value of motor-current error. During transistor non-conduction intervals, bypass diode network causes current flowing through motor to pass through voltage source in a direction such that voltage source opposes the flow of motor current, irrespective of the motor-current direction.

REFERENCES:
patent: 3624475 (1971-11-01), Smith
patent: 3735225 (1973-05-01), Raatz
patent: 3883786 (1975-05-01), McNaughton et al.
patent: 3942085 (1976-03-01), Tadakuma et al.
patent: 4037145 (1977-07-01), Bailey et al.

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