A three-phase AC asynchronous motor is an electric drive device that converts electrical energy into mechanical energy. It mainly consists of the stator, rotor, and the air gap between them. After the stator winding is connected to a three-phase AC power supply, a rotating magnetic field is generated and the rotor is cut to obtain torque. Three-phase AC asynchronous motors have the advantages of simple structure, reliable operation, low price, strong overload capacity, and convenient use, installation, and maintenance, and are widely used in various fields. The working principle of a three-phase asynchronous motor is based on the interaction between the stator rotating magnetic field (the composite magnetic field generated by the three-phase current in the stator winding) and the rotor current (the current in the rotor winding). When the symmetrical three-phase winding of the stator is connected to the three-phase power supply, a symmetrical three-phase current will be introduced into the winding and a rotating magnetic field will be generated in space. The magnetic field will rotate in the circumferential direction of the stator. When the magnetic field rotates, the conductor of the rotor winding will cut the magnetic flux and generate an induced electromotive force E. Due to the presence of electromotive force E, the rotor winding will generate rotor current I. According to Ampere's law of electromagnetic force, the interaction between rotor current and rotating magnetic field will generate electromagnetic force F (whose direction is determined by the left hand). This force forms electromagnetic torque on the rotor shaft, and the direction of the torque is the same as the direction of rotation of the rotating magnetic field. When the rotor is affected by this torque, it rotates in the direction of rotation of the rotating magnetic field. However, the rotational speed n of the rotor is always smaller than the rotational speed n0 of the rotating magnetic field (referred to as synchronous speed), because if the two speeds are equal, there is no relative motion between the rotor and the rotating magnetic field, and the rotor conductor does not cut the magnetic flux, it cannot generate induced electromotive force and current, so there is no electromagnetic torque, and the rotor will not continue to rotate. Therefore, the speed difference between the rotor and the rotating magnetic field is the main factor that ensures the rotation of the rotor
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