What are the reasons for the instability of the charging current, and how to judge?

The main reason for the instability of the charging current is the poor contact of the charging circuit. This phenomenon will not occur if the power supply is well connected to the battery when charging. But there are other reasons as well.

Alternator, when working, the ammeter pointer swings back and forth, indicating that the generator charging current is unstable. (1) Cause of failure: 1) The generator transmission belt is too loose. 2) The connection between the generator and the battery is not firmly connected.

3) The brush is worn unevenly or the brush spring fails. 4) The contacts of the regulator are ablated or oily. 5) The adjustment of the regulator does not meet the requirements.

2) Exclusion method 1) Check whether the tightness of the generator drive belt is appropriate, if it is not suitable for adjustment. 2) Check whether the wire connection between the terminal posts of the generator and the battery is reliable, if there is a fault, it should be eliminated. 3) Check the generator with a test light to make the engine run stably.

At this time, if there is a change in the brightness of the test lamp, it means that the generator is faulty. 4) Disassemble and inspect the generator, check the contact status of the brushes and the tension of the brush spring, and whether it is broken or failed. If it is good, check whether the rotor and stator coils are in poor contact.

5) Use the test lamp to check whether the generator is good and stable, and then check whether the contacts of the generator regulator are ablated or dirty, if the contacts are normal. If all of the above is normal, then finally check whether the adjustment of the regulator meets the requirements. The ammeter indicates charging and the pointer oscillates over a wide range of speeds.

This indicates that the voltage control is not stable, and when the engine is running slightly above the idle speed, the screwdriver can be used to lap the low-speed contact of the voltage regulator, such as the ammeter pointer is stable, indicating that the contact is not in good contact, or the air gap and spring tension are improperly adjusted. The ammeter needle oscillates only in the high-speed range. This indicates that the contact of the voltage regulator running at high speed is poorly contacted, and the contact can be checked for ablation, dirt, or poor contact.

The current instability caused by the failure of the charger, if you do not have the ability to overhaul it, you can change the charger, which is safer and more reliable, and there is no money anyway. When the generator is running above idle, it is sometimes charged and sometimes not charged, and the ammeter needle is constantly swinging or the charging indicator light is frequently lit. Cause of failure:

Fan belt slippage; Poor wiring of the wire from the battery to the generator armature binding post; The collector ring is dirty or the carbon brush is in poor contact with the collector ring, and the carbon brush spring is too soft; The contacts of the electromagnetic vibration voltage regulator are ablated or dirty, and the contact arm spring is too soft. Fault diagnosis: When diagnosing, the influencing factors such as poor fan belt transmission and poor wire wiring should be ruled out first, and then the following three situations should be diagnosed.

The main reasons for the unstable current are: the supply voltage is unstable; unstable load; There is poor contact in the line; There is a short circuit between the winding turns or between the layers; The bearing is not good or the leveling is not good, etc.

The strength of the current is described by the current intensity, which is the amount of electricity passing through a certain cross-section of the conductor per unit time, referred to as the current, and is represented by i.

The intensity of the current is a scalar quantity, and it is customary to specify the direction of motion of the positive charge as the direction of the current. In a conductor, the direction of the current is always in the direction of the electric field from the high potential to the low potential. In the International System of Units, the unit of current intensity is ampere (a), which is one of the seven basic units in the SI system.

The current is unstable, which will cause frequent charging and discharging of inductive components, which will frequently change the magnetic flux of the inductor coil, produce a strong induced electromotive force, and then burn the circuit. For example, the starting device of a TV set can easily burn out when the current is unstable.

The magnetic field in the fixed loop changes, causing the magnetic flux in the loop to change, and the induced electromotive force is generated. When an induced electromotive force is generated, the conductor or conductor loop does not move, while the magnetic field changes. Therefore, the cause of the induced electromotive force cannot be the Lorentz force.

The changing magnetic field produces a spin electric field, and the force of the spin electric field on the charge in the loop is a non-electrostatic force, which causes the induced electromotive force, that is, the field strength of the spin electric field, that is, the force of the spin electric field on the unit positive charge. (Photo by Chen Yalan) @2019

Reasons for the instability of the charging current:1. The generator drive belt is too loose.

2.The connection between the generator and the battery is not strong. 3.

Uneven brush wear or malfunctioning brush springs. 4.All contacts of the regulator are ablative or greasy.

5.The regulator adjustment does not meet the requirements.

Ways to check and eliminate the toll system:1Check whether the tightness of the generator drive belt is suitable for grinding, and replace or adjust.

Inspect the engine drive belt tensioner and replace it if necessary. 2.Check the wiring between the generator terminals and the battery.

3.Check the generator with a test light to keep the engine running stably. At this point, if the brightness of the test light changes, it indicates that the generator is faulty.

If necessary, disassemble and inspect the generator, check the contact of the brushes, and whether the rotor and stator coils are in poor contact. Generally, the battery will be saved when the new car is used, because the motor is easy to use, and the battery can be fully charged when the generator is good. After the car is old, especially after replacing two large motor generators, because the original and refurbished products of these two products on the market are very different, it is easy for car owners not to replace the original parts, then the battery will be more prone to failure.

How to eliminate the problem of charging current is too small.

Troubleshoot minor charging current problems: Check whether the terminals and wires of each part of the battery, generator, regulator, ammeter and other parts are firmly connected. Troubleshooting:

Reconnect. Check whether the moving contact of the regulator is ablated or oxidized, whether the gap between the moving contact arm and the iron core and the spring tension meet the technical requirements, and whether the wiring of the regulator is loose. Method:

Fix anomalies in time.

Car charging process: First, adjust the battery liquid level to the specified height with distilled water or battery-specific replenishment liquid. Before charging, connect the battery to be charged according to the rated voltage and rated current of the charging equipment.

According to the charging characteristics of the battery, when the battery is fully charged, the voltage of the pure pool of the single battery can reach about it, for the sake of reliability, the charging voltage of the single battery is generally calculated, so the charging voltage required for the three single 6V batteries is; The charging voltage required for 6 x 12V single batteries is that the total voltage of the batteries connected in series cannot be greater than the rated voltage of the charging equipment.

If several parallel circuits are charged at the same time, the total battery voltage of each parallel branch should be equal; If the capacity of the cells connected in series in one branch is not equal, and the required charging current is not equal, the charging current should be calculated as the smallest battery. If you need to charge a battery with a large current, it will take longer to charge. When charging, the positive pole of each parallel branch battery Chadan is connected with the positive pole of the charging equipment, and the negative pole of the battery is connected with the negative pole of the charging equipment, and must not be reversed.

When the alternator is working, the ammeter refers to the reciprocating swing of the Lu cavity needle, indicating that the charging current of the generator is not stable.

1) The cause of the failure.

1) The generator drive belt is too loose.

2) The connection between the generator and the battery is not firmly connected.

3) The brush is worn unevenly or the brush spring fails.

4) The contacts of the regulator are ablated or oily.

5) The adjustment of the regulator does not meet the requirements.

Check whether the tightness of the generator drive belt is suitable, replace or adjust. Check the engine drive belt tensioner and replace if necessary.

The reasons for the instability of the charging current are as follows: 1. Conveyor belt: the generator transmission belt is too loose.

2. Connection: The connection between the generator and the battery is not firmly connected. 3. Brush:

Uneven wear of brushes or failure of brush springs. 4. Regulator: Each contact of the regulator is ablated or oily.

The following is a simple inspection and elimination method for the charging system: 1. Check the conveyor belt: check whether the tightness of the generator transmission belt is suitable for replacing or adjusting the car.

Check the engine drive belt tensioner and replace if necessary. 2. Check the wire connection: check the wire connection between the generator and the battery binding posts.

Cars are already a must-have tool for everyone to get around. Of course, automotive knowledge is essential. In order to make it easier for you to understand this knowledge, today we will introduce to you how to solve the problem of unstable charging current.

Interested friends can learn about it, it may be helpful to you. The key reason for the instability of the charging current is the poor contact of the charging circuit. This does not occur when the power supply is connected to the battery while charging, but there are other reasons, such as a charger problem that causes the current to be unstable.

When the generator is spinning above idle, sometimes charging, sometimes not charging, the ammeter needle is constantly swinging or the charging indicator lights up frequently. Reason, the fan belt is slipping; Poor wiring of the wires leading to the terminals of the battery armature; The collector ring is suffocated and dirty, or the carbon brush is in poor contact with the collector ring, and the carbon brush spring is too soft; The contacts of the electromagnetic regulator are ablated or dirty, and the contact arm spring is too soft.

When diagnosing, it is necessary to first rule out the relationship factors such as poor fan belt drive and poor wire connection, and then diagnose the following three conditions.

1.The ammeter indicates charging, and the needle swings in different speed ranges. This indicates that the voltage regulation is unstable.

When the engine is slightly above idle, a screwdriver can be used to lap the regulator's low-speed contacts. For example, if the pointer of the ammeter is stable, it means that the contact is poor, or the air gap and spring tension are not adjusted properly.

2.The ammeter pointer only swings in the high-speed range. This indicates that the high-speed rotating contacts of the regulator are poorly connected and can detect whether the contacts are ablated, dirty, or in poor contact.

3. Charging is unstable in a certain speed range. Most of this problem is caused by improper adjustment of the air gap of the regulator. If the diagnostic test is still ineffective, the problem is with the generator, mostly because the collector ring is dirty or the carbon brushes are in poor contact. @2019

There are several reasons why the charging current is unstable:1. The generator belt is too loose.

2.The connection between the generator and the battery is not strong. 3.

The carbon brush is worn unevenly or the carbon brush spring fails. 4.All contacts of the regulator are ablative or greasy.

5.It was learned that the adjustment of the potato slur did not meet the requirements.

How do I eliminate unstable charging currents? 1.Check the tightness of the generator belt and replace or adjust it.

Inspect the engine belt tensioner and replace it if necessary. 2.Check the wiring between the generator terminals and the battery.

3.Check the generator with a test light to keep the engine running stably. At this time, if the brightness of the test lamp changes.

Indicates that the generator is faulty. If necessary, disassemble and inspect the generator, check the contact of the carbon brushes, and check whether the rotor and stator coils are in poor contact.

Fault diagnosis: When diagnosing, the influencing factors such as poor fan belt transmission and poor wiring should be ruled out first, and then the following three situations should be diagnosed.

The ammeter indicates charging, and the pointer swings in different speed ranges. This indicates that the voltage control is unstable. When the engine speed is slightly higher than idling, the low-speed contacts of the regulator can be lapped with a screwdriver.

For example, if the ammeter pointer is stable, it means that the contact is poor, or the air gap and spring tension are not adjusted properly.

The ammeter pointer only swings in the high-speed range. This indicates that the regulator's high-speed contacts are poorly contacted, and the contacts can be checked for ablation, soiling, or poor contact.

Charging is unstable within a certain speed range. This fault is mostly caused by improper adjustment of the air gap of the pressure regulator.

If the above diagnostic tests are still ineffective, the fault lies with the generator, usually the collector ring is dirty or the carbon brushes are in poor contact.