man truck alternator

How the Integral Alternator Works When the external circuit energizes the excitation winding through the brush, a magnetic field is generated to magnetize the claw poles into N poles and S poles. When the rotor rotates, the magnetic flux alternately changes in the stator winding. According to the principle of electromagnetic induction, an alternating induced electromotive force is generated in the three-phase winding of the stator. This is how an alternator generates electricity. The rotor of the synchronous generator with DC excitation is driven by the prime mover (that is, the engine) to rotate at a speed of n (rpm), and the three-phase stator windings induce an AC potential. If the stator winding is connected to the electric load, the motor will have AC power output, and the rectifier bridge inside the generator will convert the AC power into DC power and output it from the output terminal. The alternator is divided into two parts, the stator winding and the rotor winding. The three-phase stator windings are distributed on the housing according to the electrical angle of 120 degrees from each other. The rotor winding is composed of two pole claws. When the rotor winding is connected to DC, it is excited, and the two pole claws form N pole and S pole. The magnetic lines of force 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 winding will cut the magnetic force lines, and a sinusoidal electromotive force with a mutual difference of 120 degrees of electrical angle will be generated in the stator winding, that is, three-phase alternating current, which will be converted into direct current output through the rectifying element composed of diodes.