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三相異步電機是如何工作的

  • 發布日期:2021-07-16 總瀏覽:


三相異步電機是如何工作的

How three phase asynchronous motor works


      三相異步電機)是感應電動機的一種,是靠同時接入380V三相交流電流(相位差120度)供電的一類電動機,由于三相異步電動機的轉

子與定子旋轉磁場以相同的方向、不同的轉速旋轉,存在轉差率,所以叫三相異步電動機。三相異步電動機轉子的轉速低于旋轉磁場的轉

速,轉子繞組因與磁場間存在著相對運動而產生電動勢和電流,并與磁場相互作用產生電磁轉矩,實現能量變換。

       與單相異步電動機相比,三相異步電動機運行性能好,并可節省各種材料。按轉子結構的不同,三相異步電動機可分為籠式和繞線式兩

種?;\式轉子的異步電動機結構簡單、運行可靠、重量輕、價格便宜,得到了廣泛的應用,其主要缺點是調速困難。繞線式三相異步電動機

的轉子和定子一樣也設置了三相繞組并通過滑環、電刷與外部變阻器連接。調節變阻器電阻可以改善電動機的起動性能和調節電動機的轉

速。

Three phase asynchronous motor is a kind of induction motor, which is powered by 380V three-phase AC current (phase difference 120 degrees) at the same time

The rotating magnetic fields of stator and stator rotate in the same direction and at different speeds, and there is slip, so it is called three-phase asynchronous motor. The rotor speed of three-phase asynchronous motor is lower than that of rotating magnetic field

Because of the relative motion between the rotor winding and the magnetic field, the electromotive force and current are generated, which interact with the magnetic field to generate electromagnetic torque and realize energy conversion.

Compared with single-phase asynchronous motor, three-phase asynchronous motor has good performance and can save all kinds of materials. According to the different rotor structure, three-phase asynchronous motor can be divided into cage type and wound type

Species. Cage rotor asynchronous motor has been widely used because of its simple structure, reliable operation, light weight and low price. Its main disadvantage is that it is difficult to adjust speed.Wound three phase asynchronous motor 

The rotor and the stator are also provided with three-phase windings, which are connected with external rheostat through slip ring and brush. Adjusting the rheostat resistance can improve the starting performance and speed of the motor

Speed.


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