DC Generators
DC GENERATOR CONSTRUCTION
Rev. 0
Page 17
ES-05
Figure 13 Voltage-vs-Current for a Compounded DC Generator
In practical compounded generators, the change in output voltage from no-load to full-load is
less than 5 percent. A generator with this characteristic is said to be flat-compounded (Figure
13).
For some applications, the series winding is wound so that it overcompensates for a change in
the shunt field. The output gradually rises with increasing load current over the normal
operating range of the machine. This type of generator is called an over-compounded generator.
The series winding can also be wound so that it undercompensates for the change in shunt field
strength. The output voltage decreases gradually with an increase in load current. This type of
generator is called an under-compounded generator.
