Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 329. -Multi-Coil Siemens Drum pattern. wound upon a cylindrical laminated iron core made by as-sembling, upon the armature shaft, thin sheets of soft iron;after being properly insulated the coils are wound upon thecore, and connected in series and to the commutator in the same manner as that given forthe ring armature. Fig. 330depicts a four-coil Siemensdrum armature with its com-mutator, suitable for a bipolarfield. In practice a greatmany coils are wound up
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 329. -Multi-Coil Siemens Drum pattern. wound upon a cylindrical laminated iron core made by as-sembling, upon the armature shaft, thin sheets of soft iron;after being properly insulated the coils are wound upon thecore, and connected in series and to the commutator in the same manner as that given forthe ring armature. Fig. 330depicts a four-coil Siemensdrum armature with its 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 induced E. M. F. in thatpart of a coil under one pole isin the opposite direction tothat in the other half of thecoil so that the two E. M. are in series, as in two consecu-tive coils in the ring armature. Both halves of the drumarmature coils are in parallel with the external circuit so that. Fig. 330. ?Four-Coil Siemens DrumArmature. DYNAMO ELECTRIC MACHINES. 351 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 Armatures.—Thedifference between the ring and drum armature is that in theformer, the active ivire of each coil cutting the magnetic lines
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