Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 165
shown in Fig. 153 148 ELECTRICAL MACHINERY and is known as a pulsating current. To obtain a constantcurrent for a given value of resistance in the external circuit,or, as it is usually called, a direct current, it is necessary to havea number of coils on the armature and the ring divided intoas… … Fig. 154.—Diagrammatic representation of ring-armature type generator. the complete layout of a dynamo-electric machine having anarmature of the ring type. Coils of wire, designated fieldcoils, are placed on the polepieces. The winding on thearmature is shown, for simplicitys sake, to be conlinuous…
Electric machinery
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