The car's generator is an important presence in the car. The synchronous generator works based on the principle of electromagnetic induction. It converts mechanical energy into electrical energy through the relative motion of the rotor magnetic field and the stator winding. When the rotor is driven by an external force, the rotor magnetic field and the stator conductor move relative to each other, that is, the conductor cuts the magnetic field lines, so an induced electromotive force is generated in the conductor, and its direction can be determined according to the right-hand rule. So what are the reasons why the car generator does not generate electricity?
What are the reasons why the car generator does not generate electricity: the generator is overheated
(1) The generator does not operate according to the specified technical conditions, such as the stator voltage is too high and the iron loss increases ; The load current is too large, and the copper loss of the stator winding increases; the frequency is too low, which slows down the cooling fan speed, affecting the heat dissipation of the generator; the power factor is too low, which increases the rotor excitation current, causing the rotor to heat up. Check whether the indication of the monitoring instrument is normal. If it is abnormal, necessary adjustments and treatments must be made to make the generator operate 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 between the three-phase current exceeds 10% of the rated current, it is a serious phase current imbalance. Unbalanced three-phase current will produce a negative sequence magnetic field, thereby increasing losses and causing heating of components such as pole windings and ferrules. The three-phase load should be adjusted to keep the current of each phase as balanced as possible.
(3) The air duct is blocked by dust and the ventilation is poor, making it difficult for the generator to dissipate heat. The dust and grease in the air duct should be removed to make the air duct unobstructed.
(4) The inlet air temperature is too high or the inlet water temperature is too high, and the cooler is blocked. The inlet air or water temperature 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) Too much or too little grease is added to the bearing. Grease should be added according to regulations, usually 1/2~1/3 of the bearing chamber (the upper limit is used for low speed, and the upper limit is used for high speed). lower limit), and should not exceed 70% of the bearing chamber.
(6) Bearing wear. If the wear is not serious, the bearing may be overheated locally; if the wear is serious, the stator and the rotor may rub together, causing overheating of the stator and rotor avoidance parts. The bearings should be checked for noise. If friction between the stator and rotor is found, the machine should be stopped immediately for maintenance or bearing replacement.
(7) The insulation of the stator core is damaged, causing short circuit between the sheets, causing the local eddy current loss in the core to increase and generate heat. In severe cases, the stator winding will be damaged. The machine should be shut down immediately for maintenance.
(8) The parallel wire of the stator winding is broken, causing the current of other wires to increase and generate heat. The machine should be shut down immediately for maintenance.
What are the reasons why the car generator does not generate electricity: Abnormal performance
1. When the engine is running or driving normally, the instrument charging indicator light continues to light up.
Causes of faults and troubleshooting
1. Troubleshooting if the generator drive belt is loose or worn: adjust or replace the generator drive belt.
Check and adjust the generator drive belt:
① Visually inspect the generator drive belt for excessive wear, worn curtains, etc. If abnormal, replace the generator drive belt.
② Check the generator drive belt tension. A drive belt that is too loose will cause slipping, and a drive belt that is too tight will affect the life of the generator bearings. To check the tension of the transmission belt, you can use your fingers to strongly press the transmission belt between the two pulleys. If the reduction amount of the transmission belt is about 10mm, the tension is generally considered to be appropriate; if the reduction amount is too large, the tension will be insufficient, resulting in slipping; if the transmission belt is almost If there is no reduction, it means that the transmission belt is too tight. Adjustments are required. 2. Troubleshoot loose wire connections or circuit short circuits: Check the wire connections between the generator and battery terminals, reinstall and lock the nuts at the wire terminals.
3. Troubleshooting when the main fuse is blown: Replace the main fuse.
4. Internal faults in the generator usually occur on the voltage regulator. Troubleshooting: Repair the generator.
5. Troubleshooting for poor grounding: Check the grounding wire between the negative electrode of the battery and the car body, reinstall and tighten it.
6. Battery damage
Is wind power generation affected by the wind?
High temperature in the diesel generator room will affect the operation of the diesel generator set. But as long as it's within a reasonable range, there's generally no problem. But once you exceed this limit, you should be careful.
Especially in summer, the weather temperature is high, and the diesel generator set will dissipate heat when running. High unit temperature is a common problem. At this time, users must pay attention to the temperature of the computer room and the ventilation of the unit.
In addition, attention should also be paid to the maintenance and upkeep of the radiator of the diesel generator set, and frequent inspections should be made to ensure that the radiator of the unit is intact.
Pay attention to the addition of cooling water to the diesel generator set, but the cooling water temperature cannot be too low, otherwise it will cause harm to the operation of the unit.
During the operation of the diesel generator set, pay attention to the inspection and maintenance of the unit. Once a problem occurs, it should be stopped in time for inspection.
Wind power is a clean energy technology that uses wind energy to generate electricity. Its power generation efficiency is affected by many factors, including the following aspects:
Wind speed: Wind speed is one of the most important factors affecting wind power efficiency. The higher the wind speed, the faster the wind turbine spins and can produce more electricity. Normally, wind turbines start generating electricity when the wind speed is above 3 meters per second, and the efficiency of wind power generation is highest when the wind speed is above 10 meters per second.
Wind direction: Wind direction also affects the efficiency of wind power generation. Different wind directions will cause the wind turbine blades to be affected by different wind forces and directions, thereby affecting the efficiency of power generation.
Altitude: Altitude also affects the efficiency of wind power generation. In areas with higher altitudes, the air density is lower, and the wind force on the wind turbine blades is also smaller, which in turn affects the efficiency of power generation.
Temperature: Temperature also affects the efficiency of wind power generation. When the temperature is higher, the emptyThe air density is lower, and the wind force on the wind turbine blades is also smaller, which in turn affects the efficiency of power generation.
Wind turbine design and quality: The design and quality of a wind turbine also affects its power generation efficiency. Excellent design can enable wind turbines to generate electricity efficiently at low wind speeds, and high-quality materials can extend the service life of wind turbines.
The parameters required for wind power calculation can be provided by the Xihe Energy big data platform (xihe-energy).