Lesson 1/Learning Event 1
FIGURE 4. SHUNT-WOUND GENERATOR OPERATION.
The small amount of current produced by the residual magnetism flows through the field windings
and will increase the magnetic strength of the pole shoes. This, in turn, will increase the magnetic
field through the armature. Since the armature coils now will be cutting more lines of force per
turn, the voltage across the brushes will be increased. An increase in brush voltage increases the
field strength, which, in turn, increases the armature output. The armature voltage helps the field,
and the field helps the armature. This process, called "building up" the generator voltage, continues
until the generator reaches its normal operating voltage.