Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 170
Fig. 158. Ww Net-Drum-type armature core with three coils in place. readily to a theoretical discussion, therefore is used in ourconsideration of this subject. In the commercial type of machines the armature con-tains a number of coils. On the small-sized machines thearmature is usually wound with… … Fig. 159.—Drum-type armature complete. large number of coils of large wire having a small numberof turns, usually one turn made from a copper bar. Objections to Ring-Type Armatures.—In the earlier typeof machines the ring-armature construction was used to con-siderable extent, but it has since been…
Electric machinery
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