A brushless exciter is a device used in electrical generators to provide the necessary excitation current for the rotor. Unlike traditional exciters that use brushes and slip rings, brushless exciters operate without physical contact, which reduces wear and maintenance. They typically consist of a small generator mounted on the same shaft as the main generator, producing alternating current (AC) that is converted to direct current (DC) for excitation. These exciters enhance the reliability and efficiency of power generation systems, especially in large-scale applications like hydroelectric plants and thermal power stations. By eliminating brushes, they minimize electrical noise and improve overall performance, making them a preferred choice in modern electrical engineering.