The generator operates from the crankshaft via a V-belt drive. The rotor rotates in the stationary stator winding at approximately double the speed of the engine.
Current flows through the excitation winding via carbon brushes and slip rings. This creates a magnetic field. The position of the magnetic field relative to the stator winding constantly changes in accordance with the rotation of the rotor. This produces alternating current.
Since the battery can only be charged with direct current, the rectifier on the diode board converts alternating current into direct current. The voltage regulator changes the charging current by switching the excitation winding on and off in accordance with the battery's state of charge. At the same time, the voltage regulator maintains a constant operating voltage of about 14 V, regardless of the speed.
Caution: Unlike DC generators, never run an AC generator without a battery.
1 Belt pulley
2 Fan impeller
3 Front of the case
4 Drive bearing
5 Lid
6 Key
7 Rotor
8 Radial ball bearing rear
9 O-ring
10 Stator
11 Diode board
12 Back of the case
13 Voltage regulator
14 Set of carbon brushes
15 Radio interference filter capacitor
The article text was copied from an online resource «www.bmwman.ru»