DC GENERATOR THEORYDC GeneratorsSummaryDC generator theory is summarized below.DC Generator Theory SummaryThe three conditions necessary to induce a voltage into a conductor are:- Magnetic field- Conductor- Relative motion between the twoThe left-hand rule states that if you point the index finger of the left hand in thedirection of the magnetic field and point the thumb in the direction of motion ofthe conductor, the middle finger will point in the direction of current flow.The terminal voltage of a DC generator is adjusted by varying the field strength.The voltage rating of a DC generator is based on the insulation type and designof the machine.The current rating of a DC generator is based on the size of the conductor andthe amount of heat that can be dissipated in the generator.The power rating of a DC generator is based on the mechanical limitation of thedevice that is used to turn the generator.The upper speed rating of a DC generator is determined by the speed at whichmechanical damage is done to the machine. The lower speed rating is based onthe limit for field current.There are four internal losses that contribute to lower efficiency of a DCgenerator.- Copper losses- Eddy-current losses- Hysteresis losses- Mechanical lossesES-05 Page 12 Rev. 0
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