International Library of Technology · Scranton, International Textbook Co. · leaf 344
to reverse the currentin the armature. 13. Slitint Control.—The method of control shown inFig. 8 is sometimes called full-field control, in order todistinguish it from what is known as shunt control. InFig. 8, when the car is running at its highest speed, all theresistance is cut out and all the… … Fig. 9. E. M. F.; hence, weakening the field increases the speed,but the motor, of course, takes more current. This weak-ening can be accomplished either by cutting out part of thefield turns or by placing a resistance in shunt with thefield, thus depriving the field coils of part of the current.…
Electrical engineering
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