This way of excitation of generator has a dedicated dc generator.The dc generator, called exciter (generator excitation way belongs to him).Exciter generator with coaxial, generator exciting winding through perfectly on the large axial slip ring and fixed brush obtained from dc exciter current.dc  generator excitation regulator Working principle is as follows:

GS a synchronous generator;GSex a generator exciting winding;

G has been flow field electromechanical pivot;GexaExciter excitation winding;

Rm a magnetic field to adjust resistance;Type A, B, A slip ring and brush.

In the diagram above, the generator excitation belonged to him, and exciter belong to self excitation.

If the excitation current of exciter is provided by another one exciter and exciter excitation method belongs to the wound, and provide exciter excitation current dc generator called exciter.