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 rapidly fail.
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 pass 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). conforms to standards, 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. When dismantlingu 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 bend the wires at wills connection 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.
The start button is generally the excitation button, and the latch is used to close the short excitation path. If the key is lost, simply connect the two wires behind the lock together to use it. It is worth pointing 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 stopping thegenerator, you must disconnect the wires connected to the lock.