Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 170
lributioii of the windingon the core is the same, irrespective of tlie luimher of poles, 152 DIRECT-CURRENT MACHINERY CONSTRUCTION 153 whcro ill the drum armature tlie coil spans approximatelythe distance between the centers of adjacent poles. Although there is no difference in the two types of… … 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…
Electric machinery
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