What is the principle of automobile generator?

The following is an introduction to the principle of automobile generator: 1, electromagnetic induction principle: when the external circuit energizes the excitation winding through the brush, it generates a magnetic field to magnetize the electrode into N and S poles. When the rotor rotates, the magnetic flux in the stator winding changes alternately. According to the principle of electromagnetic induction, alternating induced electromotive force is generated in the three-phase winding of the stator. The motor drags the rotor of the synchronous generator excited by DC, so that the three-phase stator winding rotates at the speed n, and then the AC potential is induced. 2. Terminal voltage increase: After the engine is started, the terminal voltage of the generator increases with the increase of the generator speed. When the output voltage of the generator is equal to the battery voltage, the potentials at the "B" and "D" terminals of the generator are equal. At this time, the charging indicator light goes out because the potential difference between the two ends is zero. It means that the generator has been working normally. The excitation current is provided by the generator itself.