. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . RAILROAD, ELECTRIC. 723 into gears bolted to the axle. The pinions on the armature shaft are, by a very simple andingenious construction, set so that the one is half a tooth in advance of the other. Forhigh speed and heavy work this method is very efficient. In a later type of motors (Fig. 7) the r) shaped magnet has been adopted with a com-plete wrought-iron magnetic circuit, the gear reduction is double, the armat
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . RAILROAD, ELECTRIC. 723 into gears bolted to the axle. The pinions on the armature shaft are, by a very simple andingenious construction, set so that the one is half a tooth in advance of the other. Forhigh speed and heavy work this method is very efficient. In a later type of motors (Fig. 7) the r) shaped magnet has been adopted with a com-plete wrought-iron magnetic circuit, the gear reduction is double, the armature pinion mesh-ing with the larger of two gears on an intermediate countershaft carried on brackets whichengage the main axle, the pinion on the intermediate in turn meshing into a single gear on. Fig. 7.—Spragiie motor. the axle. This machine has been veiy widely adopted, and is the plan of double gearedmachines now generally employed. The suspension of the free end of the motor has beensometimes made from the car body, but it is more generally carried by equalising bars yield-ingly supported on the axle boxesj so that the resilience and size of the springs that supportthe car body is undisturbed. The ratio of reduction in gearing is dependent upon the size ofthe motor and the character of the work retjuired of it. It is essential, on account of thelimited space and the necessity of driving both axles, to have two machines, one geared toeach axle and independently mounted; the free ends of the machines are inboard, that is, theentire motor equipment is in the space between the axles. The method of regulating the Sprague electric railway motor is unique, and for the pur-poses used has proven most economical. The field magnets are wound with three sets of coilsof variable numb
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
