. Construction and test of a rotary transformer for direct current . 417Qi,^79»$ 45021 5620 80. If. 10 20 30 40 50 60 70 50 90 100OUTPUT IH AMPSKES. were taken from the generator brushes through the com-pound winding to a junction point forming short circuit-ed brushes. The load was connected hetween this junc-tion point and one side of the line by means of a doublepole switch. Ammeters were placed in the shunt field,9t;q?ply line, each leg of the short circuited brushes, andin the load line. The potential of the supply and loadwas recorded. The object of the ammeters in serie
. Construction and test of a rotary transformer for direct current . 417Qi,^79»$ 45021 5620 80. If. 10 20 30 40 50 60 70 50 90 100OUTPUT IH AMPSKES. were taken from the generator brushes through the com-pound winding to a junction point forming short circuit-ed brushes. The load was connected hetween this junc-tion point and one side of the line by means of a doublepole switch. Ammeters were placed in the shunt field,9t;q?ply line, each leg of the short circuited brushes, andin the load line. The potential of the supply and loadwas recorded. The object of the ammeters in series withthe short circuited brushes was to give the current cir-culating through the generator brushes but not accountedfor in the load circuit, Vhen operating the machine at no load, the ammetersin the short circuited brush circuits showed no , irtien the load was thrown on the circulating cur-rent reached a value of ten per cent of the output. Thiswas caused by a difference of potential between shortcircuited brushes, due to the shifting of the commutat-ing plane with respect to the brush positio
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Keywords: ., bookcentury1900, bookdecade1910, bookidconstruction, bookyear1911
