Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 369
com-mutator, suitable for a bipolarfield. In practice a greatmany coils are wound uponthe core covering its entirearea, the commutator sectionsincreasing with the sub-division of the armature coils.The induced E. M. F. in thatpart of a coil under one pole isin the opposite direction tothat in the… … Fig. 330. -Four-Coil Siemens DrumArmature. DYNAMO ELECTRIC MACHINES. 35l the induced E. M. F. is that generated by one-half ofthe total conductors upon the core, and each half of the wind-ings deliver one-half of the total current flowing to the ex-ternal circuit. 329. Advantages of Drum and Ring…
Electricity · Magnetism
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