How does a car alternator work

The working principle of the automobile alternator is based on the principle of electromagnetic induction, and the following is the working description of its main steps and components:
Power source and magnetic field generation:
Automotive alternators are usually driven by an engine, using the mechanical energy of the engine to provide power.
Inside the alternator is a rotor with a set of electromagnetic coils on the rotor, called the excitation coil or rotary excitation. When the engine spins the rotor, the exciting coil generates an electric current, which in turn generates a magnetic field.
Magnetic field induction and voltage generation:
There is also a fixed coil in the alternator, called the winding or stator. When the rotor rotates, the magnetic field changes.
According to Faraday's principle of electromagnetic induction, when the magnetic field passes through the winding, a voltage is generated at both ends of the winding. The frequency of this voltage is related to the speed of the rotor.
Alternating current generation and rectification:
The car alternator is generally an alternator, and the voltage induced in the winding is alternating current.
Since the car is commonly used for direct current, it is necessary to rectify the alternating-current output of the alternator and convert it into direct current. This is usually done with a rectifier, where a diode allows the current to flow in only one direction.
Voltage regulation and Power supply:
To maintain a constant voltage output, the alternator is also equipped with a voltage regulator. The voltage regulator adjusts the excitation current of the alternator by monitoring the difference between the input and output voltage of the circuit, so as to control the output voltage.
After rectification and voltage regulation, the direct current generated by the alternator is used to power the car, including charging the battery and powering the electrical system.
In summary, the car alternator uses the power provided by the engine to drive the rotor to rotate, generate a magnetic field, and generate alternating current in the winding through electromagnetic induction. Subsequently, alternating current is converted to direct current by a rectifier, and stabilized by a voltage regulator, which is supplied to various electrical components of the car. This working principle ensures that the alternator can supply the required power to the car in a stable and efficient manner.