. Electric railway gazette . by usingthe motors as dynamos and put the electricityback Into the line, but no one has yet devised aplan for doing this that is worth considerationfrom a practical standpoint. For such work as shown bj Fig. T, the totalhorse power required at the drawbar for a 130-tontrain is shown by Fig. S, and the horse power re-quired at the central station engine cylinders forau electric system to do this work Is shown byFig. 0, assuming the use of a controller. It is forthis class of work that the electric motor Is bestadapted to give goo3 commercial Jl/ne in socot
. Electric railway gazette . by usingthe motors as dynamos and put the electricityback Into the line, but no one has yet devised aplan for doing this that is worth considerationfrom a practical standpoint. For such work as shown bj Fig. T, the totalhorse power required at the drawbar for a 130-tontrain is shown by Fig. S, and the horse power re-quired at the central station engine cylinders forau electric system to do this work Is shown byFig. 0, assuming the use of a controller. It is forthis class of work that the electric motor Is bestadapted to give goo3 commercial Jl/ne in socotv&s Ivrve m eeco^vSs. Tvme in Seconda Tx^m-e ci /secendls FIG. 1. EFFICIEKCT OF PLAFS CLTtREXT MOTOBS WITHOUT CONTROLLER IN STJIRTING .\ LIGHT TRAIN. FIG. 2. LOSS OF HORSE POWER BETWEKN CENTRAL STATION AND DRAWBAR WHEN CONTROLLER IS NOT USED. FIG. 3. EFFICIENCY OF PLAIN CURRENT MOTORS WITH CONTROLLER IN STARTING A LIGHT TRAIN. FIG. 4 LOSS OF HORSE POWER BETWEEN CENTRAL STATION AND DRAWBAR WHEN CONTROLLER IS USED. the variation between these limits is quite differ-ent from what It Is without the controller, as Isshown by comparison of Figs. 1 and 3. A com-parison of the horse power required at the centralstation is furnished bv Figs. 2 and 4. Fig. 3 shows the efficiency of a plain currentmotor from a start to full speed for elevated rail-road work. The maximum Is about per the minimum is zero. The average Is aboutUO per cent, but in this work It is safe only to as-sume lO per cent, as the average efficiency. ThisIs about the same effic
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Keywords: ., bookcentury1800, bookdecade1890, bookidelectricrail, bookyear1895
