How does the brushless excitation system work on generators?
The brushless excitation system consists of an AC exciter and a rotary rectifier mounted on the same shaft as the generator. The exciter resembles a commutator less DC machine, with a field winding on the stator and an armature on the rotor. The output of the rotating armature of the three-phase AC exciter supplies a shaft-coupled rotary rectifier that supplies the generator field with direct current.
The great advantage of this excitation system is the non-use of brushes and collector rings that require special care, such as the cooling of the collector rings and the useful life of the brushes. The main precautions in this system are in the rotating plate that suffers centrifugal forces during operation. It is recommended that the semiconductor devices (diodes) and their fastening system be inspected at least once a year.
Watch the video demonstration of a maintenance of a turbogenerator rotor with Brushless excitation system:
Want to know more about turbogenerator maintenance tips? Contact our team for maintenance planning of your equipment.
