Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 15
ues. What is the chief advantage of the drum arm-ature? Ans. It reduces considerably the large amount of deadwire necessary with the ring type. THE ARMATURE 227 Ones. How is this accomplished? Ans. By winding the wire entirely on the outer surface ofa cylinder or drum, as it is called, as shown in… … FlG. 252.—Elementary four coil drum winding, showing the connections with the commutatorsegments, and directions of currents in the several coils. The action of this type of arma-ture is fully explained in the text. first to the commutator, it will be found that the rectangular turns of thewire…
Electrical engineering
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