The main function of the automobile generator is to supply power to all electric equipment except the starter when the engine is running normally, and charge the battery at the same time. The generator is the main power supply of the automobile. Automobile generators are alternators, which are of the following types: 1. According to the overall structure, they can be divided into ordinary alternators, integral alternators, and alternators with pumps; 2. According to the structure of rectifier, it can be divided into six tube alternator, eight tube alternator and nine tube alternator; 3. According to the grounding form of field winding, it can be divided into internal grounding alternator and external grounding alternator.