AC generator (VW Golf 2)

The generator, unlike the battery, is a dynamic current source. It has a more positive characteristic than the direct current generator. Due to its design, the alternating current generator can rotate at a higher speed. As a result, it is possible to obtain current from the alternating current generator at significantly lower engine speeds, practically at idle speed. Golf and Jetta cars are equipped with generators from Bosch or Motorola of different capacities, see "Technical data". The generator is driven by the crankshaft using a V-belt placed on a pulley (photo 2.15)



Rotor 11 (figure 4.3) together with the excitation winding, it rotates inside the stationary stator winding 13 at a speed double that of the engine. The excitation current flows through the carbon brushes 16 and the copper rings of the rotor to the excitation winding. This creates a magnetic field. Together with the rotation of the rotor, the position of the magnetic field in relation to the stator winding constantly changes. Due to this, an alternating three-phase current is formed in the stator winding, which is replaced by a direct current in the diode rectifier 18. The diodes are fixed to the plate. Depending on the state of charge of the battery, the voltage regulator changes the magnitude of the charging current by switching the excitation current on and off. At the same time, the regulator maintains a constant charging voltage at the application level of 14. V, regardless of the engine rotation speed.