基本原理：

1、当三相异步电机接入三相交流电源时，三相定子绕组流过三相对称电流产生的三相磁动势（定子旋转磁动势）并产生旋转磁场。

2、该旋转磁场与转子导体有相对切割运动，根据电磁感应原理，转子导体产生感应电动势并产生感应电流。

3、根据电磁力定律，载流的转子导体在磁场中受到电磁力作用，形成电磁转矩，驱动转子旋转，当电动机轴上带机械负载时，便向外输出机械能。

异步电机是一种交流电机，其负载时的转速与所接电网的频率之比不是恒定关系。还随着负载的大小发生变化。负载转矩越大，转子的转速越低。异步电机包括感应电机、双馈异步电机和交流换向器电机。感应电机应用最广，在不致引起误解或混淆的情况下，一般可称感应电机为异步电机。

The basic principle:
1, when the three-phase asynchronous motor three-phase AC power, three-phase three-phase stator winding MMF through three-phase symmetrical current generated (stator magnetomotive force) and produce a rotating magnetic field.
2, the rotating magnetic field and the rotor conductors have relative cutting motion, according to the principle of electromagnetic induction, rotor conductor induced electromotive force and induced current.
3, according to the law of electromagnetic force, the rotor conductor ampacity by electromagnetic force in the magnetic field, electromagnetic torque, driving the rotor to rotate, when with the mechanical load on the shaft of the motor, then output mechanical energy.
Asynchronous motor is a kind of AC motor, the load speed frequency and the grid ratio is not constant relations. Along with load changes size. The greater the load torque, the rotor speed is low. Asynchronous motor including induction motor, doubly fed asynchronous motor and AC motor commutator. The most widely used induction motor, will not lead to misunderstanding or confusion, general induction motor can be said for asynchronous motor.