Car generator, also called car alternator. It plays an important role in automotive components - power generation. \x0d\ During use, non-charging and minor charging failures often occur, causing serious power loss to the car battery and making it difficult to start the car. At this time, the car alternator needs to be replaced or repaired. \x0d\Disassembly and assembly of automobile silicon rectifier generator\x0d\ 1. Inspection before disassembly\x0d\ (1) Clean the appearance of the generator; \x0d\ (2) Hold the pulley to check the bearing axial and radial clearance before testing;\x0d\ x0d\(3) Rotate the rotor and check the bearing resistance, noise and whether there is any friction\x0d\ and abnormal noise between the rotor and the stator. When the resistance is found to be large, you can remove the brush and try again to determine whether the resistance comes from the brush or the bearing; (4) Turn the rotor shaft to visually check the swing difference of the pulley to judge the rotor Is the shaft \x0d\ bent? \x0d\ (5) Check whether there are cracks or damage in the shell, hanging feet, etc. \x0d\ 2. Disassembly of silicon rectifier generator\x0d\ (1) Remove the rear bearing cover and oil seal, unscrew the rotor shaft fastening nut; \x0d\ (2) Remove the fastening screws of the front and rear end covers, and Separate the front end cover with the rotor from the \x0d\ rear end cover with the stator, and make a mark on the front and rear end covers and the stator core for easy reassembly; \x0d\ (3) Remove the pulley and tighten it nut, remove the pulley, fan, and semi-circular key to separate the rotor from the \x0d\ front end cover. Be careful not to break the stator coil lead; \x0d\ (4) Remove the front bearing cover and take out the front bearing; \x0d\ ( 5) Remove the protective cover on the rear end cover; \x0d\ (6) Remove the connecting nut of the stator coil line end on the component board and the connection nut of the neutral wire end \x0d\ to connect the stator and the component board (heat sink plate) Separate and take out the stator assembly; \x0d\ (7) Remove the nuts fastening the component plate assembly on the rear end cover and the fastening nuts of the armature terminals, \x0d\ remove the component board assembly. \x0d\3. Assembly of generator\x0d\ (1) First, add No. 1 to No. 3 calcium-sodium composite grease to the bearing. However, the amount of grease filled in the bearing should not be too much to avoid overflow and splashing in the bearing. on the slip ring, causing poor brush contact; \x0d\ (2) Assemble the bearings of the front and rear end covers (201#203#); \x0d\ (3) Install the rectifier component plate onto the rear end cover (10 million Do not miss the insulating pad); \x0d\ (4) Install the stator assembly on the rear end cover and connect it to the rectifier component board (the four terminals (pieces) on the stator winding should be allowed to flow naturally, do not pull them forcefully, Forcefully fold to prevent the rotor from being scratched); \x0d\ (5) Install the rotor assembly onto the stator and rear end cover; \x0d\ (6) Combine the front and rear end covers (note that the nuts of the connecting bolts face the fan, and the connecting bolts should not While tightening, turn the rotor to ensure that the rotor and stator are not burned. If the rotor scratches the stator, tap the generator casing with a wooden hammer to adjust it.); \x0d\ (7) Assemble the semicircular key, fan, pulley, and front and rear fixing nuts of the rotor shaft; \x0d\ (8) Assemble the brush holder assembly (note that the position of the brush holder and the copper slip ring on the rotor shaft should be Alignment, never use one brush to eat two slip rings, otherwise it will not be able to generate electricity); \x0d\(9) The assembled generator should rotate flexibly, with no sticking, no scratching sound, and no movement of the rotor shaft. Phenomenon. \x0d\ (4) Maintenance of silicon rectifier generator 1. Maintenance of generator casing \x0d\ The casing should have no cracks, the hanging feet should be intact, and the matching gap between the socket hole on the casing and the outer ring of the bearing should not be greater than 0.1mm. \x0d\2. Maintenance of generator carbon brushes and springs\x0d\The carbon brush should move freely in the carbon brush holder without sticking. There should be no oil on the carbon brush. The length should not be too short. The elastic force of the carbon brush spring should meet the regulations. Require. \x0d\ 3. Detect the rectifier diode \x0d\ Use the resistance R×1 level of the multimeter to detect the diode. The forward resistance value is 8~10Ω and the reverse resistance value is more than 10ΚΩ. \x0d\4. Detection of rotor coil\x0d\ Use multimeter R×1 level to detect the resistance of the magnetic field connection post to the ground. The resistance of the 12V generator should be 5~7Ω, indicating that the coil is normal and the resistance is too low or too high. If there are too many, it means that the magnetic field winding has a short circuit or open circuit, and the connection between the winding and the slip ring is faulty. \x0d\5. Detection of stator coil\x0d\ Use multimeter R×1 to measure the resistance of the three connecting ends of the stator coil. The resistance values should be consistent. If the measured resistance value is too large or too small (close to zero), then Indicates that there is an open circuit or short circuit inside the coil. \x0d\6. Check the slip ring\x0d\ The surface of the slip ring should be clean, flat and smooth, without ablation scars, and the surface roughness should not be greater than 1.6 microns. Oil stains are not allowed on the surface of the slip ring, and there are slight burn marks on the surface. It should be polished with fine sandpaper, and the thickness of the copper ring of the slip ring should be no less than 2mm.
What are the steps to disassemble and assemble a car generator?
The following items should be noted when using diesel generator sets:
1. Pay attention to the usage occasions
1) The generator should be placed outdoors or in the machine room when in use. In a well-ventilated place, do not be close to doors, windows and vents to avoid carbon monoxide entering the room.
2) Do not use generators near flammable and explosive materials.
3) The generator should be placed in a dry place. If it needs to be installed in the open air, it must be shielded by a canopy-type building to prevent contact accidents due to moisture.
2. Pay attention to the storage and use of fuel
1) Generator fuel should be stored in a dedicated warehouse, and the facilities in the warehouse must comply with the regulations of the fire department.
2) The type of fuel used should be consistent with the requirements on the generator instruction manual or label.
3) Before adding fuel, the generator should be turned off first, and then added after the generator has cooled down to prevent the fuel from gradually reaching the higher temperature parts and catching fire, causing disaster.
3. Pay attention to the circuit connection of the generator
1) The specifications of outdoor wires must meet the requirements of the electrical load used.
2) When using an extended wire, make sure it is well insulated from the ground.
3) The outlet wire of the generator cannot be directly plugged into the original power socket of the residence to provide power. This will cause feedback and may cause electric shock to users powered by the same transformer. The correct connection is for an electrician to install a power transfer switch.
4. Keep diesel fuel clean.
Before using oil barrels to fill diesel fuel, it must undergo sufficient sedimentation, and the sedimentation time is preferably more than 3 days. When refueling, it should also be carefully filtered to prevent the mixing of mechanical impurities. The oil storage container and refueling tools should also be kept clean during operation.
5. Other fuels cannot be mixed into the diesel of the unit.
If there are other fuels in diesel, the combustion performance will be significantly worse, resulting in difficulty in starting or even failure to start. Other fuel entering the cylinder will also wash away the cylinder lubricating oil film and accelerate cylinder wear.
6. Try to use high-quality diesel.
The quality of diesel is directly related to whether the diesel engine can operate normally. If you use poor quality diesel, on the one hand, it will reduce the power of the diesel engine due to poor combustion, making it insufficient in power; on the other hand, if it is used for a long time, it will accelerate the wear of various parts of the fuel system and reduce the service life of the diesel engine. Therefore, try to choose diesel of good quality and suitable brand.
Car generator, also called car alternator. It plays an important role in automotive components - power generation.
During use, non-charging and minor charging failures often occur, causing serious power loss to the car battery and making it difficult to start the car. At this time, the car alternator needs to be replaced or repaired.
Disassembly and assembly of automobile silicon rectifier generator
1. Inspection before disassembly
(1) Clean the appearance of the generator;
(2) Hold the pulley to check the axial and radial clearance of the bearing before testing;
(3) Turn the rotor and check the bearing resistance, noise and whether there is friction between the rotor and the stator
and Abnormal noise. When the resistance is found to be large, you can remove the brush and try again to determine whether the resistance comes from the brush or the bearing; (4) Turn the rotor shaft to visually check the pulley The size of the swing difference to determine whether the rotor shaft
is bent;
(5) Check whether there are cracks or damage in the casing, hanging feet, etc.
2. Disassembly of silicon rectifier generator
(1) Remove the rear bearing cover and oil seal, and unscrew the rotor shaft fastening nut;
(2) ) Remove the fastening screws of the front and rear end covers, separate the front end cover with the rotor from the rear end cover with the stator, and make the same mark on the front and rear end covers and the stator core to facilitate Used during reassembly;
(3) Remove the pulley fastening nut, remove the pulley, fan, and semi-circular key to separate the rotor from the
front end cover. Be careful not toPull off the stator coil lead;
(4) Remove the front bearing cover and take out the front bearing;
(5) Remove the protective cover on the rear end cover;
(6) Remove the connecting nut of the stator coil wire end on the component board and the connection nut of the neutral wire terminal
to separate the stator from the component board (heat sink) and take out the stator assembly;
(7) Remove the nut fastening the component plate assembly and the fastening nut of the armature terminal on the rear end cover,
Remove the component board assembly.
3. Assembly of the generator
(1) First, add No. 1 to No. 3 calcium-sodium-based grease to the bearing, but the amount of grease filled in the bearing should not be too much. , to avoid overflow and splashing on the slip ring, causing poor brush contact;
(2) Assemble the bearings of the front and rear end caps (201#203#) respectively;
(3) Install the rectifier component board on the rear end cover (do not miss the insulating pad);
(4) Install the stator assembly on the rear end cover and connect it with the rectifier component board (The four terminals (pieces) on the stator winding should be allowed to slide naturally, and do not pull or bend forcefully to avoid scratching the rotor);
(5) Install the rotor assembly into the stator and rear end cover ;
(6) Combined connection of front and rear end covers (note that the nuts of the connecting bolts face the fan, the connecting bolts should be tightened diagonally, and while tightening, rotate the rotor to make sure it does not scratch the stator to avoid burning the rotor and stator. If the rotor scrapes against the stator, use a wooden hammer to hit the generator casing to adjust);
(7) Assemble the semicircular key, fan, pulley, and front and rear fixing nuts of the rotor shaft;
(8) Assemble the brush holder assembly (note that the position of the brush holder and the copper slip ring on the rotor shaft should be aligned, and one brush must not eat two slip rings, otherwise power generation will not be possible);
(9) The assembled generator should rotate flexibly, with no jamming, no scratching sound, and no movement of the rotor shaft.
(4) Maintenance of silicon rectifier generator 1. Maintenance of generator casing
The casing should have no cracks, the hanging feet should be intact, and the bearing holes on the casing and the bearing outer ring should be The fitting gap shall not be greater than 0.1mm.
2. Inspect the generator carbon brushes and springs
The carbon brushes should move freely in the carbon brush holder without sticking. There should be no oil on the carbon brushes, and the length should not be too short. , The carbon brush spring elasticity should meet the specified requirements.
3. Detect the rectifier diode
Use the resistance R×1 level of the multimeter to detect the diode. The forward resistance value is 8~10Ω and the reverse resistance value is more than 10KΩ.
4. Detection of the rotor coil
Use the R×1 scale of the multimeter to detect the resistance of the magnetic field connection post to the ground. The resistance of the 12V generator should be 5~7Ω, indicating that the coil Normal, if the resistance value is too low or too much, it means that the magnetic field winding has a short circuit or an open circuit, and the connection between the winding and the slip ring is faulty.
5. Detection of stator coil
Use a multimeter R×1 to measure the resistance of the three connecting ends of the stator coil. The resistance values should be consistent. If the measured resistance value is too large or too small (close to zero), it means that the coil is open or short-circuited.
6. Check the slip ring
The surface of the slip ring should be clean, flat and smooth, without ablation scars, and the surface roughness should not be greater than 1.6 microns. The surface of the slip ring is not allowed. If there is oil stains or slight burn marks on the surface, it should be polished with fine sandpaper. The thickness of the copper ring of the slip ring should be no less than 2mm.