Method of operating a shunt-wound DC motor as well as controllin

Details Method of operating a shunt-wound DC motor as well as controllin Method of operating a shunt-wound DC motor as well as controllin

1981-11-23

1984-01-17

Weldon, Ulysses

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318348, 318349, 318405, H02P 506

Patent

active

044266057

ABSTRACT:
So as to permit operating a shunt-wound motor with the series characteristic without the use of electronic armature current adjusters, it is proposed to start the motor (1) with the connection of start-up resistances (R.sub.1 -R.sub.4) and to control each step added by means of a comparator by a minimum armature current value (I.sub.A min o -I.sub.A min 4) specifically predetermined for each step. After said minimum value specific to each step has been reached, the comparator (7) actuates a guide and a regulating switch (S.sub.w, S.sub.x), whereby the minimum armature current value so reached specific to the step is kept constant by means of adjusting the excitation (I'.sub.E), and a limiting unit (17) prevents the exciting current (I'.sub.E) from dropping below a predetermined minimum value (I'.sub.E mn), which, at higher numbers of revolution (n), again leads to the shunt characteristic, now with reduced excitation (I'.sub.E min) and the resistances (R.sub.1 -R.sub.4) connected specific to each step, which prevents the motor from overspeeding (FIG. 1).

REFERENCES:
patent: 3005138 (1961-10-01), Scheer
patent: 3950684 (1976-04-01), Peterson
patent: 3983466 (1976-09-01), Safiuddin
patent: 4037144 (1977-07-01), Ohmae et al.
patent: 4099111 (1978-07-01), Inaba et al.
patent: 4247807 (1981-01-01), Wilson

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