It depends on how you use it, because every time you run the generator or stop it, you must first turn off the power supply (i.e. the blade , and some have leakage protections) to make sure the generator is generating electricity or is completely shut down. Wait for the generator to generate electricity, then press the power switch. Because some generators are used for a long time, it will be easy if you don't do it (as mentioned above, "loss of electricity". magnetism")! Then use a 12V battery to magnetize the generator. Just touch the positive and negative poles of the rotor slip ring (note here, if there is a big spark when contacting, it proves that the positive and negative poles are reversed. After changing the poles, if there is no only a small spark, this proves that the magnetization is successful)!
D'Generally speaking, if the alternator group is used normally and is not short-circuited or overloaded, it will not be broken. , you can look at the coil to see if there are signs of burning, send it to the maintenance office for repair. If there are no signs of burning, it means it has. lost magnetism. Please magnetize it. If the magnetization does not work, that is, the transistor in the generator box is broken. It would be better if you could measure it yourself. Otherwise, send it to a professional to measure it. This is for you! (Generally speaking, there is always something wrong with the generator when it is running. Vibration. (Unless your shock resistance performance is good!), check if any wires are broken. If it 'is the case, please log in it)!
Phenomena: a . The excitation current increases and the excitation voltage decreases. b. LThe stator current increases, the voltage decreases and synchronization may be lost. c. The rate of force increases or advances. d. The vibration of the generator increases and there is smoke or a burning smell inside the generator. e. The carbon brush can catch fire violently.
Treatment: a. Reduce active load. b. If the two-point grounding protection action of the rotor causes the generator switch to trip, check whether the excitation switch has tripped. Otherwise, open it manually. c. If there is a short circuit between the layers of the rotor, the vibration increases or the excitation current increases sharply and the two-point grounding protection of the rotor does not work, the load should be reduced immediately and the machine must be stopped. .
Application environment
A ground fault at any point in the generator excitation circuit is one of thecommon fault forms. An earth fault at any point in the excitation circuit does not cause any damage. the generator, but a second one occurs one after the other. Point grounding, that is, when the rotor is grounded at two points, a considerable fault current passes through the fault point and burns the rotor body, which increases the current of the 'field winding. and can cause burns due to overheating; because part of the winding is short-circuited, the air gap flux. Loss of balance can cause vibrations and even magnetize the shaft and turbine. The consequences of a two-point earth fault are serious, including the rotor. earth protection must be installed.