China Naming Network - Ziwei knowledge - 1 1, the excitation line of Corolla generator is out of power.

1 1, the excitation line of Corolla generator is out of power.

Automobile generators are very important in automobiles. Synchronous generator works according to the principle of electromagnetic induction, and converts mechanical energy into electrical energy through the annual movement of rotor magnetic field and stator winding. When the rotor is driven by external force, the rotor magnetic field and stator conductor move year by year, that is, the conductor cuts the magnetic field lines, thus generating induced electromotive force in the conductor, and its direction can be determined according to the right-hand rule. What is the reason why car generators don't generate electricity?

What is the reason why car generators don't generate electricity? The generator is overheated.

(1) The generator does not operate according to the specified technical conditions. If the stator voltage is too high, the iron loss will increase; If the current is too large, the copper loss of stator winding will increase; If the frequency is too low, the cooling fan will slow down, which will affect the heat dissipation of the generator. If the power factor is too low, the excitation current of the rotor will increase, resulting in the rotor heating. Check whether the indication of monitoring instrument is normal. If there is any abnormality, necessary adjustment and treatment are needed to make the generator run according to the specified technical conditions.

(2) The three-phase load current of the generator is unbalanced, and the overloaded one-phase winding will overheat; If the difference of three-phase current exceeds 10% of the rated current, it means that the phase current is seriously unbalanced, which will cause negative sequence magnetic field, and then increase the loss, resulting in heating of pole windings, ferrules and other components. The three-phase load should be adjusted to keep the phase current balance to the maximum extent.

(3) The air duct is blocked by dust, which leads to poor ventilation and makes it difficult for the generator to dissipate heat. Dust and grease in the air duct should be removed to make the air duct unobstructed.

(4) If the inlet air temperature is too high or the inlet water temperature is too high, the cooler will be blocked. The temperature of the air inlet or water inlet should be lowered to clear the blockage in the cooler. Before the fault is eliminated, the generator load should be limited to reduce the generator temperature.

(5) If the bearing is oiled too much or too little, it should be oiled according to the regulations, which is generally 1/2~ 1/3 (upper limit of low speed and lower limit of high speed) of the bearing cavity, and it is recommended that it should not exceed 70% of the bearing cavity.

(6) Bearing wear. If the wear is not serious, the bearing will overheat locally; If the wear is serious, it may cause friction between the stator and the rotor, resulting in overheating of the parts avoided by the stator and the rotor. Check the bearing for noise. If friction is found between stator and rotor, stop the machine immediately to repair or replace the bearing.

(7) The insulation of the stator core is damaged, which leads to short circuit between pieces, resulting in an increase in local eddy current loss of the core and heating, which will damage the stator winding in severe cases. Stop the machine immediately for maintenance.

(8) The parallel conductor of the stator winding is broken, which increases the current of other conductors and generates heat. Stop the machine immediately for maintenance.

What is the reason why car generators don't generate electricity? Abnormal symptoms.

1. When the engine or driving is normal, the instrument charging indicator light will continue to light up.

Cause of failure and its elimination

1. Troubleshooting of generator drive belt lifting or wear: adjust or replace the generator drive belt.

Check and adjust the generator drive belt:

① Visually inspect the generator drive belt for excessive wear and cord fabric wear. If it is abnormal, replace the generator drive belt.

② Check the tension of the generator drive belt. Excessive lifting of the drive belt will affect the slip, and too tight drive belt will affect the life of the generator bearing. To detect the tension of the drive belt, you can press the drive belt between two pulleys with your fingers. Most people think that the tension of the transmission belt is appropriate if the compression amount is about 10 mm, and if the compression amount is too large and the tension is insufficient, it will affect the slip; If the drive belt hardly decelerates, it means that the drive belt is too tight. Make adjustments. 2. Troubleshooting of wiring lifting or short circuit: Check the wiring between each terminal of the generator and the battery, and reinstall and lock the terminal nuts.

3. Troubleshooting of main fuse blowing: replace the main fuse.

4. Most internal faults of the generator will occur on the voltage regulator. Troubleshooting: repair the generator.

5. Troubleshooting of poor grounding: Check the grounding wire between the negative electrode of the battery and the car body, reinstall and tighten it.

6. The battery is damaged

Today, the brief introduction of Bian Xiao Auto ends here. The above is a brief introduction to the reasons why automobile generators do not generate electricity. Automobile generators are also very important and need regular maintenance. No matter what part of the car is basically repaired, I hope Bian Xiao's brief introduction can solve the problem for you. Want to know more, pay attention to car Bian Xiao.

Solution of automobile generator not generating electricity

When it comes to cars, friends will not feel strange. We can see him in our daily life, and he is also a very important travel tool for everyone. Even for some old drivers, cars are very important friends. Therefore, in order to better understand our love for cars, we need to know more about cars. So today, the car editor will briefly introduce to friends the reasons why the car generator does not generate electricity!

Brief introduction of automobile generator: working principle

The working principle of integral alternator When the external circuit energizes the excitation winding through the brush, it will generate a magnetic field and magnetize the claw pole into N pole and S pole. When the rotor rotates, the magnetic flux in the stator winding changes alternately. According to the principle of electromagnetic induction, the stator three-phase winding produces alternating induced electromotive force. This is the power generation principle of alternator. The motor (that is, the engine) drags the rotor of DC-excited synchronous generator to rotate at the speed of N (rpm), and the three-phase stator winding induces AC potential. If the stator winding is connected to an electrical load, the motor will have AC power output, which will be converted into DC power through the rectifier bridge inside the generator and output from the output terminal. Alternator consists of stator winding and rotor winding. Three-phase stator windings are distributed on the shell at different electrical angles of 120 degrees. The rotor winding consists of two pole claws. When the rotor winding is energized by DC, it will be excited, and the two-pole claw will become N-pole and S-pole after development. The magnetic field lines start from the N pole, enter the stator core through the air gap, and then return to the adjacent S pole. Once the rotor rotates, the rotor winding will cut off the magnetic field lines, and a sinusoidal electromotive force with an electrical angle of 120 degrees will be generated in the stator winding, that is, three-phase alternating current, which will be converted into direct current output through a rectifier component composed of diodes. When the switch is closed, the battery begins to provide current. Circuit: positive battery &; Rarr charging indicator &; Rarr regulator contact &; Rarr excitation winding &; Rarr grounding and negative electrode of Rarr battery. At this point, the charging indicator light will light up because there is current flowing. However, after the engine is started, with the increase of generator speed, the terminal voltage of the generator may not necessarily increase. When the output voltage of the generator is equal to the battery voltage, the generator &; LdquoB & amprdquo and & otherD & ampRdquo, the charging indicator light goes out at this time because the potential difference between the two ends is zero. It means that the generator has been working normally and the excitation current is provided by the generator itself. The three-phase AC electromotive force generated by the three-phase winding of the generator is rectified by the diode and then outputs DC power to supply power to the load and charge the battery.

Brief introduction of automobile generator: reasons

There are many reasons why the alternator does not generate electricity, and the following points are often encountered:

(1) diode breakdown has no rectification effect.

(2) The electric swipe card is in the grip.

(3) The excitation winding of the rotor is not energized.

(4) The stator winding is also short-circuited or grounded.

(5) Lift the rotor claw pole.

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