Control system for D.C. electric motor

Details Control system for D.C. electric motor Control system for D.C. electric motor

1980-03-17

1981-09-08

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345G, 318505, H02P 516

Patent

active

042887291

ABSTRACT:
A control system for a D.C. electric motor utilizing a Ward-Leonard rotation speed control system in which noise components in the input power to the motor are substantially eliminated. Switching means in the form of gate turning-off thyristors couples a delta-connected capacitance circuit to the input line to the motor between inductors coupled in series with each phase of the input line. Switching means is provided which is opened after a predetermined time delay from the firing time of the thyristor converter. The time delay is preferably approximately one-fourth of the system natural oscillation period.

REFERENCES:
patent: 3555361 (1971-01-01), Hallberg
patent: 3873854 (1975-03-01), Lamp
patent: 4051545 (1977-09-01), Kloss
patent: 4158864 (1979-06-01), Kennon

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