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三相异步电机是如何工作的

  • 发布日期:2021-07-16 总浏览:


三相异步电机是如何工作的

How three phase asynchronous motor works


      三相异步电机)是感应电动机的一种,是靠同时接入380V三相交流电流(相位差120度)供电的一类电动机,由于三相异步电动机的转

子与定子旋转磁场以相同的方向、不同的转速旋转,存在转差率,所以叫三相异步电动机。三相异步电动机转子的转速低于旋转磁场的转

速,转子绕组因与磁场间存在着相对运动而产生电动势和电流,并与磁场相互作用产生电磁转矩,实现能量变换。

       与单相异步电动机相比,三相异步电动机运行性能好,并可节省各种材料。按转子结构的不同,三相异步电动机可分为笼式和绕线式两

种。笼式转子的异步电动机结构简单、运行可靠、重量轻、价格便宜,得到了广泛的应用,其主要缺点是调速困难。绕线式三相异步电动机

的转子和定子一样也设置了三相绕组并通过滑环、电刷与外部变阻器连接。调节变阻器电阻可以改善电动机的起动性能和调节电动机的转

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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