2. The excitation current controlled by negative feedback network controls the rotor magnetic field winding. When the output voltage is higher than the set value of the required voltage of the vehicle, such as 14.75v of Toyota, 14.5v of Nissan, 13.65v of Santana and 16.8v of some Honda, the main function of the voltage regulator is to reduce or even cut off the excitation current.
3. When the vehicle engine is running and stopping, the excitation current comes from different sources. When the vehicle engine is running, it generates electricity from itself, which is called self-excitation, or "self-excitation" for short. When the vehicle engine stops or the power generation voltage is very low, the current flowing through the charging indicator lamp is used to provide the initial excitation current, which is called separate excitation or pre-excitation.
4. Various automobile generator regulators and their circuits are quite different. The above is described according to the circuit diagram you provided.
The pink arrow in the figure shows the path of the separately excited current: battery+pole-charging indicator lamp-regulator and excitation rotor-regulator magnetic field control transistor C pole or FET F terminal-inner tube-ground. At this time, the magnetic field is established, and the induced electromotive force will be generated when the coil is waiting for rotation.
Welcome questions! Yangzhou Baihui Auto Repair Yang Ming technician replied.