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Compound Generators

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DC GENERATOR CONSTRUCTION DC Generators ES-05 Page 16 Rev. 0 Figure 12  Compounded DC Generator Compound Generators Series-wound    and    shunt-wound generators  have  a  disadvantage  in that  changes in load current cause changes in generator output voltage. Many applications in which generators are used require a more stable  output  voltage  than  can  be supplied by a series-wound or shunt- wound  generator.    One  means  of supplying a stable output voltage is by using a compound generator. The compound generator has a field winding     in     parallel     with     the generator  armature (the  same as a shunt-wound generator) and a field winding in series with the generator armature (the same as a series-wound generator) (Figure 12). The two windings of the compounded generator are made such that their magnetic fields will either aid or oppose one another. If the two fields are wound so that their flux fields oppose one another, the generator is said to be differentially-compounded.  Due to the nature of this type of generator, it is used only in special cases and will not be discussed further in this text. If the two fields of a compound generator are wound so that their magnetic fields aid one another, the generator is said to be cumulatively-compounded.  As the load current increases, the current through the series field winding increases, increasing the overall magnetic field strength and causing an increase in the output voltage of the generator.  With proper design, the increase in the magnetic field strength of the series winding will compensate for the decrease in shunt field strength.    Therefore,  the  overall  strength  of  the  combined  magnetic  fields  remains  almost unchanged, so the output voltage will remain constant.  In reality, the two fields cannot be made so that their magnetic field strengths compensate for each other completely.  There will be some change in output voltage from the no-load to full-load conditions.



   


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