What precautions should be taken when using and maintaining the alternator?

Introduction What are the precautions for using and maintaining the alternator? The alternator has a simple structure and is easy to maintain when used correctly, it not only has fewer faults but also has a long service life. But if you use

What precautions should be taken when using and maintaining the alternator?

The alternator has a simple structure and is easy to maintain when used correctly, it not only has fewer faults but also has a long service life. However, if used incorrectly, it can easily cause a malfunction. It is different from the traditional DC generator in principle and use. When using an alternator, you should pay attention to the following points.

① When using an alternator, you should pay attention to check whether the generator is negative ground or positive ground. If the generator is negative grounded, the battery must also be negative grounded, otherwise where the live wire comes from. the battery As soon as the live terminal of the alternator is touched (usually marked with "+" or "armature"), the battery will discharge largely through the diode, causing the diode to fail quickly.

② Once the engine is stalled, the contactorignition switch should be turned off or the main power switch should be turned off in time, otherwise the battery will cause premature damage to the coil due to long-term discharge of the battery. the magnetic field winding and the magnetizing coil of the regulator.

③When judging the fault of the charging system, it is never allowed to use a screwdriver to directly connect the "magnetic field" (F) and "ignition" (S) of the regulator bipolar as when testing a traditional DC generator Short-circuit the two poles, otherwise the medium and high speed contacts of the bipolar regulator will be ablated. Because when the "magnetic field" (F) and "ignition" (S) of the bipolar regulator are short-circuited, the generator voltage will immediately increase, and the electromagnetic attraction of the magnetizing coil of the regulator will increase, causing a strong -Quick to close contacts. At the moment when the rapid contact is closed, a shortt-circuit occurs in the power supply and a strong current will flow through the fast contact, thereby removing the fast contact.

④ When the generator fails to produce electricity, the cause of the fault should be found and eliminated as soon as possible. Do not operate the fault for a long time. When the rectifier diode is damaged, it must be replaced at any time to avoid damage to other diodes and stator windings caused by continuous operation. When the rectifier diode is connected to the stator winding, it is forbidden to use a megger or a power supply above 220V to check the generator insulation, otherwise the diode will fail.

⑤ When the generator is running, do not use the spark test method to check whether the generator produces electricity, otherwise the diode will be easily damaged. In the past, when a DC generator wast used, a screwdriver was often used to scrape the flame between the "armature" terminal and the generator housing to check if the generator was producing electricity. However, for alternating current generators it is said. This is equivalent to short-circuiting the generator, thereby affecting the life of the diode and winding.

⑥When maintaining the generator, focus on checking the radial clearance of the front and rear bearings of the generator (the axial and radial clearance of the bearings should not exceed 0.25mm if it not satisfied). up to standard, check it as soon as possible. Replace it to avoid scratching the stator coil due to internal movement of the generator armature. When filling the bearings with lubricating oil, do not overfill it to avoid excess lubricating oil splashing inside the generator when the bearing rotates at high speed and causing other failures. Lors disassembly of the generator, focus on checking the insulation quality of all generator insulating pads. If ablation is noted, they must be replaced to avoid further failures caused by the insulating pads.

⑦ When replacing new wires, the generator winding coils should be replaced as close to the original ones as possible. New copper wires with the same wire diameter The use of Copper wires thinner than the original wires will reduce current output and increase the load on the generator. When replacing the diode, the power of the soldering iron used for welding should not exceed 45W, welding should be carried out quickly, and it is best to use heat dissipation measures (such as holding the pins with a needle-nose pliers) to help dissipate heat. .

⑧When the generator is running, do not bendwill the connecting wires of the various electrical components to avoid short circuits and damage to the semiconductor components of the generator and regulator. The line between the generator "+" and the battery "+" must be connected securely and reliably. Because when the generator is running at high speed, if the charging circuit is suddenly disconnected, an overvoltage will occur, which will not only cause the rectifier diode of the generator to fail, but also damage other equipment with semi-automatic components. -drivers.

When repairing a car, if the generator is not producing electricity, how can you determine if the regulator needs to be replaced or if the generator is broken?,

The Start button is generally the excitation button, and the lock is To close the short excitation path, if the key is lost, connect the two wires behind the lock together to use it. He stupidjust pointed out that if your excitation circuit does not have a diode connected in series, battery power can flow back after the generator shuts down. After the generator stops, you need to disconnect the wires connected to the lock.

How to determine generator regulator damage:

The regulator will have three terminals, one is the positive pole, the other is the negative pole (ground) , and there is This is the terminal of the magnetic field. Light test method: connect the positive pole to the positive pole of the regulator, connect the ground to the ground pole of the regulator, use a wire to connect the magnetic field pole to the carbon brush, and ground the other brush coal. Use a test light to check if the carbon brush has power. If the bulb lights up, it means the generator regulator is normal. If it does not light up, it means it is damaged.

Symptoms of generator regulator damager:

1. The generator is not generating electricity and the battery light on the instrument is on. The generator not producing electricity is usually due to the failure of the field effect transistor or Darlington tube inside the voltage regulator.

2. If the power output is too high, the battery will be easily damaged. Once the battery is damaged, if the voltage is lower than 10V, it will be difficult to start the car. Excessive power generation overcharges the battery and affects its lifespan.

3. The generator regulator is damaged, resulting in no power production, which affects vehicle performance, inability to accelerate and increased fuel consumption.

Detailed information

Car generator maintenance:

1. Cleaning, because the heat generated during generator operation is blown away by the veuser behind the pulley. . Enter the case for cooling, remove dirt and dust on the surface of the generator, and keep the ventilation channels open to facilitate heat dissipation.

2. Check and adjust the drive belt tension. The alternator is driven by the engine via the transmission belt. The drive belt tension should be adjusted appropriately. If it's too loose, it will be. can easily cause the drive belt to slip and result in insufficient power generation. If the drive belt is too loose, it will result in insufficient power generation. If it is too tight, it will easily cause damage to the transmission belt and excessive wear of the generator. Checking the tightness of the transmission belt is very simple. Under static conditions, apply a force of 50 N to the center ofe the transmission belt by hand. The sealing is suitable when it can be pushed in 10-12mm.

3. Check lines, keep the wiring connection between generator and regulator firm and in good contact. If there is rust, it should be polished with sandpaper in time. If the threads are oxidized, they should be polished in time.

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