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Engine AlternatorThe alternator is divided into two parts: the stator winding and the rotor winding. The three-phase stator windings are distributed on the casing according to the electrical angle of 120 degrees from each other, and the rotor winding is composed of two pole claws. When the rotor winding is connected to direct current, it is excited, and the two pole claws form the N pole and the S pole. The magnetic field lines start from the N pole, enter the stator core through the air gap, and then return to the adjacent S pole. Once the rotor rotates, the rotor windings will cut the magnetic lines of force and generate sinusoidal electromotive force with an electrical angle of 120 degrees in the stator windings, that is, three-phase alternating current, which is then converted into direct current output through the rectifier element composed of diodes.