. Design of a direct current generator and switchboard for a farm power plant. 5 + + + 18 .4 = 180 .watts hyst. & eddy current .? The number of cycles (40) used above is the number of revolutions per second multiplied by the number of pairs of4 1200 poles - x 60 = 40 cycles per second. By summing up all the losses of the machine at thevarious values of load from load up to load andfinding the ratio of the output over the output plus the losses,the electrical efficiency at the various loads is obtained anda curve plotted between percent efficiency and percentfull load. E
. Design of a direct current generator and switchboard for a farm power plant. 5 + + + 18 .4 = 180 .watts hyst. & eddy current .? The number of cycles (40) used above is the number of revolutions per second multiplied by the number of pairs of4 1200 poles - x 60 = 40 cycles per second. By summing up all the losses of the machine at thevarious values of load from load up to load andfinding the ratio of the output over the output plus the losses,the electrical efficiency at the various loads is obtained anda curve plotted between percent efficiency and percentfull load. Efficiency Data Losses 0 .25 Load 0 .5 Load Load Full Load 1,25 Lo; Armature I R 26 104 232 413 645 Series Field I R. 4 15 32 57 89 Commutator Loss 58 58 58 58 58 Shunt 284 Field I R. 284 284 284 284 Brush I R. 11 45 102 182 284 Hyst & Eddy 180 180 Current 180 180 180 Friction & Windage 300 300 300 300 300 Sum 863 986 1188 1474 1840 Output 2500 5000 7500 10000 12500 Output + 14340 Losses 3363 5986 8688 11474 EffsOutput 74,3$ $ 87 87 Output Losses. Assuming the value of friction and windage loss tobe 3fo of full load output, which is the value given inThomsons Dynamo-Electric Machinery Volume I. for this sizeof machine.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
