1. Separately excited DC generator: In this type of generator, the field winding is supplied with a separate DC power source, independent of the armature winding. This allows for better control of the generator's output voltage and current.
2. Self-excited DC generator: In this type of generator, the field winding is connected in series or parallel with the armature winding, so that the generator can generate its own magnetic field when the armature is rotating. This type of generator is simpler and more cost-effective, but may have less precise control over the output voltage and current.