Self-excitation is a method used by electrical generators to use some of the generator's output to generate the magnetic field used by the generator. Instead of having large permanent magnets, self-excited generators have extra coils that either boost the generator's permanent magnets or completely replace them.

This achieves two purposes:

  • Reduces the physical size (or cost) of the generator.
  • Provides a means to easily control (regulate) the generator's output.

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