Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 199
ction in which thearmature is revolving. However, this is true only of a gen-erator. When we consider the electric motor, it will be found thatthe brushes must be shifted against the direction of rotation, toassist in reversing the current in the coil under commutation. CHAPTER XIII TYPES OF… … Fig. 194.—Separate-excited shunt generator. 194, the tick! coils are assumed to be connected to some sourceof electric current, for exciting them, separate from the arma-ture. In alternating-current generators the field coils arealways excited from a separate source of direct current, hut…
Electric machinery
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