The reasons for the increase in temperature of different parts of the generator are as follows:
1. Unbalanced three-phase current of the stator
2. Water pressure of cooling, flow, abnormal temperature;
3. The generator's air path is blocked or the water in the air cooler is cut off. The water temperature is too high, making the air temperature abnormal; p>
4. Long-term overload.
The treatment methods when the above reasons occur are:
1. Strictly monitor the current imbalance of the three-phase stator and should not exceed the regulations
2; . Adjust internal cooling water system pressure, flow rate and temperature;
3. If it is found that the cooling water flow is reduced due to air entering the rotor coil and the temperature rises abnormally. , the machine must be stopped for processing ;
4. Increase the water volume of the air cooler or pour additional water.
What are common reasons why a car generator is not producing electricity?
"The voltage can reach 410V when first powered on (the voltage regulation is already the highest)." If this sentence is a summary of how it works, I can tell you that the AVR and excitation of the system generator you are using DOES NOT match.
Under normal circumstances, the no-load setting voltage range of the generator should be 350V~500V, but the AVR you equipped has a maximum setting of 410, which does not is obviously not qualified. Since the generator resistance will increase with increasing temperature after the generator is loaded, there must be enough excitation current to compensate for the drop in generator output voltage. However, your AVR cannot provideof compensation current, the operating time will therefore be reduced. shortcut. The reason why the long-term voltage will gradually drop to 370V.
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 must be lowered to eliminate blockage in the cooler. Before the fault is cleared, the generator load must be limited to reduce the generator temperature.
If the bearing is filled with too much or too little grease, grease should be added according to regulations, generally 1/2 ~ 1/3 of the bearing chamber (the upper limit is used to low speeds, and the lower limit is used for high speeds). And it is recommended not to exceed 70% of the bearing chamber.
Bearing wear. If wear is not significant, the bearingt can overheat locally; if wear is severe, the stator and rotor may rub against each other, causing the stator and rotor avoidance parts to overheat. Bearings should be checked for noise. If friction between the stator and rotor is detected, the machine should be stopped immediately for maintenance or replacement of the bearings.
Extended information:
When the external circuit feeds the excitation winding to Through the brush, a magnetic field is generated, causing the claw poles to be magnetized into N poles and S poles. As the rotor rotates, the magnetic flux changes alternately in the stator winding. According to the principle of electromagnetic induction, it can be seen that an alternating induced electromotive force is generated in the three-phase winding of the stator. This is how an alternator produces electricity.
The main motorcipal (i.e. the motor) drives the rotor of the synchronous generator excited by the direct current to rotate at a speed n (rpm), and the winding of the three-phase stator induces an alternating potential. If the stator winding is connected,electrical load, the motor has alternating current output and the rectifier bridge inside the generator converts the alternating current into direct current and outputs it from the output terminal.
The alternator is divided into two parts: the stator winding and the rotor winding. The three-phase stator winding is distributed across the housing at an electrical angle difference of 120 degrees to each other. is composed of two polar claws. When the rotor winding is connected to direct current, it is excited and the two pole claws form the N pole and the S pole.
The magnetic field lines start from the N pole, enter the core of the stator through the air gap then return to the polee S adjacent. Once the rotor turns, the rotor windings cut the magnetic lines of force, generating a sinusoidal electromotive force with a mutual difference of 120 electrical degrees in the stator windings, i.e. three-phase alternating current, then converted into direct current output via the rectifier element composed of diodes.
Baidu Encyclopedia - Car Generator