Triple-phase asynchronous motor

three-phase asynchronous motor is a type of induction motor. It is a kind of motor that is powered by simultaneously connecting 380V three-phase alternating current (with a phase difference of 120 degrees). Because the rotor of a three-phase asynchronous motor rotates in the same direction as the stator's rotating magnetic field but at a different speed, there is a slip rate, which is why it is called a three-phase asynchronous motor. The rotational speed of the rotor in a three-phase asynchronous motor is lower than that of the rotating magnetic field. Due to the relative motion between the rotor winding and the magnetic field, an electromotive force and current are generated, which interact with the magnetic field to produce an electromagnetic torque, achieving energy conversion.

Compared with single-phase asynchronous motors, three-phase asynchronous motors have better operating performance and can save various materials. According to the difference in rotor structure, three-phase asynchronous motors can be divided into squirrel-cage type and wound-rotor type. The asynchronous motor with cage rotor has a simple structure, reliable operation, light weight and low price, and has been widely applied.

When symmetrical three-phase alternating current is fed into the three-phase stator windings, a rotating magnetic field that rotates clockwise along the inner circular space of the stator and rotor at a synchronous speed n1 is generated. Since the rotating magnetic field rotates at a speed of n1, the rotor conductors are initially stationary. Therefore, the rotor conductors will cut through the rotating magnetic field of the stator and generate an induced electromotive force (the direction of the induced electromotive force is determined by the right-hand rule). As the two ends of the rotor conductors are short-circuited by short-circuit rings, under the action of the induced electromotive force, an induced current basically consistent with the direction of the induced electromotive force will be generated in the rotor conductors. The current-carrying conductors of the rotor are subjected to electromagnetic force in the stator magnetic field (the direction of the force is determined by the left-hand rule). The electromagnetic force generates an electromagnetic torque on the rotor shaft, driving the rotor to rotate along the direction of the rotating magnetic field.

phase stator windings of an electric motor (each with a 120-degree electrical Angle difference), a rotating magnetic field will be generated. This rotating magnetic field cuts through the rotor windings, thereby inducing current in the rotor windings (the rotor windings form a closed circuit). The current-carrying rotor conductors will generate electromagnetic force under the action of the stator's rotating magnetic field. Thus, an electromagnetic torque is formed on the motor shaft, driving the motor to rotate, and the rotation direction of the motor is the same as that of the rotating magnetic field.