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Synchronous generator is the mechanical energy is converted to AC power conversion equipment. Self-excited synchronous generator power plant past, the widespread adoption of DC generators provide excitation current to generate electricity. This excitation mode, due to the application of DC generators, therefore, to safeguard and ensure the safe operation of the presence of alternating current into direct current is converted by the commutator, which in turn provides the excitation current to the field winding through copper rings and brushes synchronous generator, They have brought a lot of problems. In order to improve this excitation mode. 1960s mainly developed with static silicon rectifier synchronous generator constant self-motivation, this generator brushes and slip ring still exists, still need regular maintenance, and generation of wireless electromagnetic interference. In order to solve the problems fundamentally modern synchronous generators, improvement and development through extensive use of coaxial AC brushless exciter and rotating rectifier brushless synchronous generator. The basic form of synchronous generator into the rotating armature and rotating magnetic pole-type two types. As shown, these two types of synchronous generator although structurally different, but the basic principle is the same, namely the relative movement of the magnetic field and the wire, the wire induced electromotive force. Brush AC synchronous generator before rotating magnetic field generator armature is fixed, while the prime mover drag armature rotating, three-phase alternating current is supplied to the load through the slip ring and brush leads. Advantages of such generators is that the utilization of high silicon steel core, and the stator is a frame do yoke, to save steel, the drawback is limited by the capacity of the output voltage can not be too high, because: 1 Current armature winding is diverted to an external circuit connecting the slip ring and brush through. If the current output is too large, it will cause excessive spark between the slip rings and brushes. If the output voltage is too large, the slip ring and brushes insulation difficult to resolve, so the voltage is generally not more than 500V. 2. Due to the limited amount of space the armature, if excessive winding turns and the insulating layer is too thick, difficult to produce, which limits voltage increases and capacity increases. 3. When the high speed of the armature, and vibration due to the centrifugal force increases, is likely to cause damage to the armature, thus limiting the operation of the generator. 4. Such generator power has been rarely used, complex structure, the cost is more expensive.