There are many reasons why the generator can't produce voltage, and many reasons need to be analyzed in different excitation systems. Taking the self-excited generator as an example, several basic reasons why the generator can not produce voltage are analyzed.

　　建壓物理過程的速度發電機原動機到額定轉速,轉子磁場繞組L剩磁切割定子繞組,定子繞組電動勢的一個小殘餘磁性,有一個非常低的剩磁電壓發生器出口端,輸入在調節係統中,一個小殘餘磁性當前u整流器後,加入磁場繞組,轉子磁場增強,定子電動勢,勵磁電流增加,所以循環，通過提高發電機的額定電壓。

　　The speed of the physical process of voltage build-up is from the prime mover of generator to the rated speed. The residual magnetism of rotor field winding L cuts the stator winding. There is a small residual magnetism of stator winding electromotive force. There is a very low residual magnetism voltage generator outlet end, which is input into the regulation system. After a small residual magnetism current U rectifier is added, the field winding is added, the rotor field is enhanced, the stator electromotive force and the excitation current are increased, So cycle by increasing the rated voltage of the generator.

　　1. 交流發電機電壓構成的必要條件

　　1. Necessary conditions for voltage composition of alternator

　　(1)轉子勵磁繞組必須有剩磁，剩磁必須足夠強，否則定子繞組不能產生足夠的剩磁或電壓過低，剩磁電流近似為0。

　　(1) The excitation winding of the rotor must have remanence, and the remanence must be strong enough, otherwise the stator winding cannot produce enough remanence or the voltage is too low, and the remanence current is approximately 0.

　　(2)轉速應足夠高(接近額定轉速)，使剩餘磁場能高速切斷定子繞組，感應剩餘電動勢足夠大。

　　(2) The speed shall be high enough (close to the rated speed) so that the residual magnetic field can cut off the stator winding at high speed and the induced residual electromotive force is large enough.

　　(3)極性要正確，即通過各器件的剩餘電壓轉換成勵磁電流所產生的磁場要加強剩餘磁場，否則會相互抵消。

　　(3) The polarity shall be correct, that is to say, the magnetic field generated by converting the residual voltage of each device into the excitation current shall be strengthened, otherwise it will cancel each other.

　　2. 發電機不能建成的原因及處理方法

　　2. Reasons for the failure of the generator to be built and Solutions

　　(1)剩磁方向與激發電流方向相反，即極性相反。你可以把勵磁線圈的兩端調換一下，試一試就能找到。

　　(1) The remanence direction is opposite to the excitation current direction, i.e. the polarity is opposite. You can change the two ends of the excitation coil and try to find out.

　　(2)剩磁喪失或剩磁過弱。工作或長期未使用的發電機應注意檢查殘餘磁性,檢查的方法是測量發電機端電壓速度接近額定轉速時,如果它能達到IOV,這意味著殘餘磁性是正常的,否則,6 ~ 12 v直流可以直接連接到正負兩極的勵磁繞組。

　　(2) Loss of or over weakening of remanence. For the first working or long-term unused generator, pay attention to check the residual magnetism. When the voltage speed at the generator end is close to the rated speed, if it can reach IOV, it means that the residual magnetism is normal. Otherwise, 6-12V DC can be directly connected to the excitation winding at the positive and negative poles.

　　(3)速度過低，此時隻能根據原動機的轉速表或具體測量。

　　(3) The speed is too low. At this time, it can only be measured according to the tachometer or specific measurement of the prime mover.

　　(4)有時發電機的電壓是正常的，但因為電壓表沒有指示，很容易造成錯覺。應注意檢查電壓表及其接線是否正確，保險絲是否熔斷。

　　(4) Sometimes the voltage of the generator is normal, but because the voltmeter has no indication, it is easy to cause illusion. Pay attention to check whether the voltmeter and its wiring are correct and whether the fuse is blown.

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　　The above is the relevant content introduced by the coking generator set manufacturer. For more information, please visit the website: http://www.dabenche.com