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Hysteresis Losses - h1011v2_89
DC GENERATOR CONSTRUCTION

Electrical Science Volume 2 of 4
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DC GENERATOR THEORY DC Generators Summary DC generator theory is summarized below. DC Generator Theory Summary The three conditions necessary to induce a voltage into a conductor are: - Magnetic field - Conductor - Relative motion between the two The left-hand rule states that if you point the index finger of the left hand in the direction of the magnetic field and point the thumb in the direction of motion of the 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 design of the machine. The current rating of a DC generator is based on the size of the conductor and the amount of heat that can be dissipated in the generator. The power rating of a DC generator is based on the mechanical limitation of the device that is used to turn the generator. The upper speed rating of a DC generator is determined by the speed at which mechanical damage is done to the machine.   The lower speed rating is based on the limit for field current. There  are  four  internal  losses  that  contribute  to  lower  efficiency  of  a  DC generator. - Copper losses - Eddy-current losses - Hysteresis losses - Mechanical losses ES-05 Page 12 Rev. 0







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