1、 brushless synchronous generator Overview

Synchronous generator is converted into mechanical energy of an AC power converting apparatus. Captive power plant in the past synchronous generator diesel generator excitation, widely used in DC generator excitation current to generate electricity. This excitation mode, due to the application of a DC generator, therefore, to maintain and ensure the safe operation of the presence of alternating current into direct current is converted by the commutator, and the excitation current to the field winding and brush provided through the brass ring synchronous generator and charcoal, have brought many problems still. In order to improve this excitation mode. 1960s, with major development of the self-excitation constant voltage silicon rectifier static synchronous generators, this generator still exists carbon brushes and slip rings, still need regular maintenance, but also generate wireless electromagnetic interference. In order to solve the fundamental problems of modern synchronous generators, by improving and developing, widely used coaxial AC brushless exciter and rotating rectifier brushless synchronous generator.

2, the working principle of brushless synchronous generator

The principle of the AC generator is a brushless exciter field windings on the stator to provide excitation to the rotor armature windings issued AC is rectified in the main generator rotor field winding to power the rotor, so that the main power machine armature windings in the stator induced AC needed to. This is generally the alternator "brushless" works.   

When the prime mover and drag to rotate the main generator, AC exciter armature windings cut remanence and self-motivation will be issued first AC, then rotated into the DC rectifier become the main generator rotor windings are energized. Then the output of the main generator voltage. Excitation power from the generator output terminal voltage, (see photo), this is called self-excitation constant voltage generator. Just adjust the AC exciter field current, you can change the main generator excitation current to control the output of the voltage of the main generator, relying on automatic voltage output terminal connected to the main generator and exciter stator field winding exchanges between regulation control can stabilize the terminal voltage of the main generator. See brushless synchronous generator wiring diagram 2.

3, the structural characteristics of brushless synchronous generator

Brushless synchronous generator from the main part of the main generator (synchronous generator), AC exciter, rotating rectifiers and other components, the main generator rotor, exciter armature and rotating rectifier are mounted on the same shaft to rotate together, exciter poles fixed inside the stator. Main generator structure similar, are rotary field type, there are two salient pole pole and convex, AC exciter to turn the pivot type. Synchronous generator by the brush has evolved to mainly brushless AC exciter and rotating rectifier.