Advantages and maintenance considerations of auto alternators and regulators

Most auto generators are alternators, and the alternator supplies power to all electrical equipment and batteries when the engine is running normally. The current auto uses a three-phase alternator with a diode rectifier circuit inside to convert the alternating current into direct current, so the output of the auto alternating current motor is direct current. Compared with traditional DC generators, AC generators have the following advantages:
1. Small size, light weight, high output power;
2. The structure is simple and there are few faults, so the maintenance is convenient and the service life is relatively long:
Good charging performance at low speed. Since the rotor of the alternator generates a magnetic field, when the brushes of the alternator are in contact with the slip ring, only a small magnetic field current passes through, and the maximum speed of the alternator can be increased.
4. The regulator used is simple, only need to set the voltage regulator:
5. There is no rectification spark and little interference to radio.
In order to meet the requirements of constant voltage of electrical equipment, the alternator must be equipped with voltage
Regulator, the voltage regulator controls the output voltage of the generator to keep the output voltage basically constant under all working conditions of the engine to meet the requirements of automotive electrical appliances.
Matters needing attention during maintenance of alternator and regulator
1. It is not allowed to use a screwdriver or a wire to ground the armature terminal of the generator and the casing to test the fire, otherwise, the instantaneous large current or the high-voltage electromotive force generated by induction will burn or break down the silicon diode.
2. It is not allowed to use screwdrivers or wires to test the two terminals of the generator armature and the magnetic field, otherwise, the voltage of the generator will increase, and the magnetic force of the magnetizing coil of the two-wire voltage regulator will be strong, which will make the second-stage contacts close, causing Consequences of burning out the second level contacts and their leads. The current circuit for burning the second-level contact is: generator "ten" connecting post · overlapping screwdriver→generator magnetic field connecting post→regulator magnetic field connecting post→regulator bracket second contact→ground iron→generator" One" post.
3. It is not allowed to use the generator magnetic field connection post as a grounding test fire, otherwise, the first contact will be burned if a large current passes.
4. Attention must be paid to the polarity of the alternator grounding, and reverse connection is absolutely not allowed. If the polarity of the generator and battery is reversed, it will cause the silicon diode to conduct forward and a large current will pass through it to burn it. Therefore, when replacing the battery, its grounding polarity must match the alternator's grounding polarity.
5. The alternator charges the battery, and the current intensity and speed are higher than those of the DC generator. When it is found that the charging current becomes smaller or close to "0", more attention should be paid to judging whether there is a fault in the charging system, and the working voltage should not be increased blindly and arbitrarily, so as to avoid early damage to the battery, generator excitation winding and other electrical equipment.
6. When the engine is running, it is not allowed to remove or disconnect the wire on the "ten" terminal of the generator, otherwise it is easy to break down the transistor device in the charging system.
7. If you use a 220V AC power supply or a megohmmeter to check the insulation performance of the alternator, you must first disassemble the generator, and separate the leads of transistor components such as diodes from the connections of each part, otherwise the transistor will be damaged.