A brushless excitation system is, essentially, an inside-out ac generator that delivers its ac voltage to the rotor of the main generator, and receives its excitation from the stator of that same generator. ... The exciter can be powered by a PMG, this way avoiding any external voltage source, figure 5.

How does a brushless generator work?

A brushless generator uses a motor without carbon brushes to create electricity. Instead, a brushless motor uses a small generator on the end of the equipment to transfer electrical current. Brushless alternators are suitable for primary generators and capable of long-term use.

What is the advantage of the brushless exciter?

The main advantage of the brushless excitation system is there is no contact between Mechanical and Electrical parts of the system and there is no use of circuit breakers and field breakers. Reduced in maintenance time, outage time, and costs for replacements parts.