. Design of a direct current generator and switchboard for a farm power plant. e room temperature for the seriesfield. This is well within the limit of 50° generally used. Saturation or Magnetization Curve:- Taking the den-sities of the different parts of the magnetic circuits atdensities from up to normal densities, the ampereturns necessary to produce them were found for each part andtheir sum gave the necessary to produce the correspondingvalues of voltage from up to normal voltage. Theresults are tabulated below and a curve was drawn betweenvoltage and ampere turns .
. Design of a direct current generator and switchboard for a farm power plant. e room temperature for the seriesfield. This is well within the limit of 50° generally used. Saturation or Magnetization Curve:- Taking the den-sities of the different parts of the magnetic circuits atdensities from up to normal densities, the ampereturns necessary to produce them were found for each part andtheir sum gave the necessary to produce the correspondingvalues of voltage from up to normal voltage. Theresults are tabulated below and a curve was drawn betweenvoltage and ampere turns . Saturation Curve Data E 55 Armature Teeth Gap Pole Yoke Total normal body CoreVoltage Density 32,360 34,250 2§375 44p00 12,050 per in. 1 3 Total 1 1530 3 11 1546 E volts. normal voltage. Density 48,500 51,500 38,800 66,000 18,975 per in. Total 2280 17 2305 E volts. normal 80,800 85,500 64,700 110,000 30,125 per in. 80 Total 6 3800 158 40 4007. 19 Efficiency:- The losses in a direct current generatorare:- 3? R losses in the armature windings, in the series andshunt fields, and in the brushes, friction loss on the commutator,and bearings, windage, and hysteresis and eddy current losses inthe teeth and armature. These losses have all been determinedbut the hysteresis and eddy current and the bearing frictionand windage. Curves were found in Thomsons Dynamo-ElectricMachinery, Volume I, pages 103 and 105 which gave the watts lostper cubic inch per cycle by hysteresis and by eddy teeth have a density of 68,500 for which density the hys-teresis loss using n= is watts per cu, in. percycle and the eddy current loss using laminations 20 mils inthickness is watts per cu. in, for one cycle and variesas the square of the number of cycles. Since there are 59 teetheach having an area of sq. in. and a depth of
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