Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . tage it will readily be noted onindicating instruments in the testing circuit. 335. Armature Winding.—After complete insulation ofthe armature core it is ready to receive the armature large tooth-core bodies the conductors are generally in theform of straight bars of rectangular cross-section which havebeen previously insulated. One or more bars are inserted ineach slot, and the coils formed by connecting their ends toother bars by flexible formed end terminals soldered to t
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . tage it will readily be noted onindicating instruments in the testing circuit. 335. Armature Winding.—After complete insulation ofthe armature core it is ready to receive the armature large tooth-core bodies the conductors are generally in theform of straight bars of rectangular cross-section which havebeen previously insulated. One or more bars are inserted ineach slot, and the coils formed by connecting their ends toother bars by flexible formed end terminals soldered to them,provision being made for commutator taps at the ends of theproper coils, when the armature is for a direct current are many kinds of armature connections, each de-signed for a specific purpose, such as series winding, doubleor triple multiple-winding, multiple-wound two-circuit wind-ing, etc.* A small smooth-core drum armature body for atwo-pole field is depicted in Figs. 342 and 343. Suppose it * Armature winding is treated in books relating to dynamo design. 360 PRACTICAL Fig. 343.—Position of the Coils on a DrumArmature. is to be wound as a closed coil series wound armature with 8coils and 3 turns per coil. The armature core is divided into16 divisions by the fibre wedges alluded to in ^j 334, and thefirst coil wound in division 1 and 9 ; the second, in 2 and 10,and so on. Commence to wind the beginning of coil No. 1 in division 1, and itwill end in division 9,Fig. 343; commencecoil No. 2 in division2, wind in the samedirection as coil No. 1,and it will end indivision 10, and so coils should thenbe bound to the arma-ture core by mountingit in the lathe andwinding several bands around them, each consisting of anumber of turns of phosphor bronze wire. Mica is interposedbetween the band wires and the armature wires, and theformer soldered together, thus producing a solid band. Acommutator with 8 bars will be required since there are 8
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