Working principle of three-phase asynchronous motor

After connecting the stator winding to the three-phase power supply, the motor generates a rotating magnetic field, which refers to the magnetic field distributed sinusoidally on the circumference of the air gap between the stator and rotor in the motor, and can continuously rotate around the motor in space. There is relative motion between the rotor and the rotating magnetic field. The rotor conductor is cut by the magnetic field lines of the rotating magnetic field, generating induced electromotive force. It induces current in the rotor winding, and the interaction between the two produces electromagnetic torque, causing the rotor to rotate. Thus converting electrical energy into mechanical energy of the rotating shaft. When the three-phase stator windings of an electric motor (each with a difference of 120 degrees in electrical angle) are fed with three-phase symmetrical alternating current, a rotating magnetic field is generated, which cuts the rotor winding and induces current in the rotor winding (the rotor winding is a closed path). The current carrying rotor conductor will generate electromagnetic force under the action of the stator rotating magnetic field, thereby forming electromagnetic torque on the motor shaft, driving the motor to rotate in the same direction as the rotating magnetic field.