. Electrical world. ted conductors, 8, constituting thecoils of the armature winding. These coils or conductors, as shown,are of strap copper, the turns of which are located side by side inthe slots, forming three separate coils, which span the core from thefirst to the ninth slot, and so on around the core. The coils are prop-erly joined together at one end of the armature by means of suitableconnectors, g and 10, so as to form a closed parallel winding. Theconnectors, 10, are provided with sockets, II, in which are fastenedthe outer ends of suitable connecting wires or strips, 12, the innere
. Electrical world. ted conductors, 8, constituting thecoils of the armature winding. These coils or conductors, as shown,are of strap copper, the turns of which are located side by side inthe slots, forming three separate coils, which span the core from thefirst to the ninth slot, and so on around the core. The coils are prop-erly joined together at one end of the armature by means of suitableconnectors, g and 10, so as to form a closed parallel winding. Theconnectors, 10, are provided with sockets, II, in which are fastenedthe outer ends of suitable connecting wires or strips, 12, the innerends of which are connected to balancing rings, 13, in a well-knownmanner. For the purpose of reducing the secondary currents that are gen-erated by the alternating magnetic field in the coils which are short-circuited at the brushes to substantially non-sparking limits, I jointhe connectors. 9 and 10, to the several commutator bars, 14, by meansof relatively high resistance leads, 15, there being in the present case. SINGLE-PH.\SE R.\ILW.\V MOTOR P.\TENT. 216 commutator bars and the same number of leads. As employed byme, these leads are in the form of strips of German silver, and theirdimensions are actually determined, in view of the specific resistanceof the material, so as to reduce the secondary current, above referredto, to the desired limits, and the form and arrangement of the leadsare also such as to be properly accommodated by the space availableand so as to be properly ventilated and securely supported inde-pendently of each other. The commutator brushes, 141, are arrangedin sets in the holders or arms, and, in the present instance, the armsor holders are eight in number. The brushes and arms may be ofusual material and construction and connected in the usual mannerto properly co-operate with the commutator cylinder and the supplycircuit. As indicated in Fig. i, the leads, 15, are bent into substan-tially the form of U-shaped loops, the inner ends of which are heldin
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
