. Design of a direct current generator and switchboard for a farm power plant. ntflowing through the turns of the armaturecause a magneto-motive force, a compon-ent of which directly opposes the the field. As shown by the accompany-ing diagram, the ampere turns on the arm-ature face between the poles are the onesthat produce this component . Therefore in order to obtainthe desired flux, the ampere turns on the field core must beincreased sufficiently to overcome this armature there are 472 conductors and amperes per circuitin the armature, the ampere conductors per
. Design of a direct current generator and switchboard for a farm power plant. ntflowing through the turns of the armaturecause a magneto-motive force, a compon-ent of which directly opposes the the field. As shown by the accompany-ing diagram, the ampere turns on the arm-ature face between the poles are the onesthat produce this component . Therefore in order to obtainthe desired flux, the ampere turns on the field core must beincreased sufficiently to overcome this armature there are 472 conductors and amperes per circuitin the armature, the ampere conductors per pole are4— ^ 3-*7 = 2680. The ampere conductors beneath the poleare $ of 2680 - 2050. Therefore the ampere conductorsbetween the poles that set up the armature reaction are2680 - 2050 = 630. Or 630 , for the conductors passingbetween two poles on one side of the armature come betweentwo similar poles on the other side, each pair forming a 630 ampere turns per pair of poles are to be wound halfon each pole or 315 per pole to compensate for armature. reaction. Adding these to the former total, viz. 3557 the sum is 3852 needed at full load. The furnished by the shunt field are, as found, 3224. Subtracting these from the total gives 3852 - 3224 = 628 which must be furnished by the series field. Since the current at full load is SO .9 amperes, the number of turns for the series field6 28 will be TZTr, = But there must be a half turn in order90 .9 to be in position to start winding the next pole, therefore it is made 7,5 turns per pole. A strip x inches was used giving an area of sq. in, or 95,500 circular 95,500 mils. This gives a current density of = 1050 circularmils per ampere which is necessary on account of turns are wound on edge. Allowing in. for insulationthe width of the strip is + = in. and the lengthof pole core occupied is 8 x * inches. The depth ofwinding is 1
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
