Separately excited D.C. motors

Details Separately excited D.C. motors Separately excited D.C. motors

1974-07-12

1977-08-16

Dobeck, B.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318351, 318331, 318432, 318269, H02P 516

Patent

active

040428656

ABSTRACT:
A separately excited speed-controlled D.C. motor which has constant armature current and pulse-controlled field current has its armature connected by way of a bridge rectifier and an inductor to an A.C. source of substantially greater r.m.s. voltage than the rated supply voltage of the armature, the inductor serving to regulate the armature current. The field winding is connected to a field excitation supply and to a thyristor chopper and the mean current through the field winding controlled by the thyristor chopper thereby to control the armature torque and therefore the speed. The field winding may comprise two field coils arranged to produce opposing magnetic fields, the thyristor chopper serving to control the net magnitude and direction of the motor field. A thyristor chopper may be provided in the armature circuit to maintain a constant armature current during plugging of the motor.

REFERENCES:
patent: 2832026 (1958-04-01), McAdie
patent: 2876408 (1959-03-01), Alexanderson
patent: 2964691 (1960-12-01), Dinger
patent: 3302089 (1967-01-01), Rosa
patent: 3388306 (1968-06-01), Koppelmann
patent: 3466522 (1969-09-01), Cushing
patent: 3593086 (1971-07-01), Thombs
patent: 3599064 (1971-08-01), Friedman
patent: 3675105 (1972-07-01), Petrigalla
patent: 3764822 (1973-10-01), Ebbinge et al.

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