Quantcast Series-Wound DC Generators

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DC Generators DC GENERATOR CONSTRUCTION Rev. 0 Page 15 ES-05 Figure 10  Series-Wound DC Generator Figure 11  Output Voltage-vs-Load Current for Series-Wound       DC Generator Series-Wound DC Generators When the field winding of a DC generator is connected in series with the armature, the generator is called a series-wound generator (Figure 10). The   excitation   current   in   a series-wound  generator  is  the same    as    the    current    the generator  delivers to  the load. If the load has a high resistance and only draws a small amount of     current,     the     excitation current is also small.  Therefore, the magnetic field of the series field  winding  is  weak,  making the    generated    voltage    low. Conversely, if the load draws a large current, the excitation current is also high.  Therefore, the magnetic field of the series field winding is very strong, and the generated voltage is high. As you can see in Figure 11, in a series generator, changes in load current    drastically    affect    the generator   output   voltage.      A series generator has poor voltage regulation, and, as a result, series generators    are    not    used    for fluctuating loads.  As is the case for the shunt-wound generator, a series-wound generator also exhibits  some  losses  due  to  the resistance  of  the  windings  and armature  reaction.   These losses cause  a  lower  terminal  voltage than that for an ideal magnetization curve.


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