Three-phase asynchronous motor (Triple-phase asynchronous motor) is a kind of induction motor. It is a type of motor powered by 380V three-phase AC current (phase difference 120 degrees) at the same time. Because the rotor and stator of the three-phase asynchronous motor rotate The magnetic field rotates in the same direction and at different speeds, and there is a slip rate, so it is called a three-phase asynchronous motor. The rotational speed of the rotor of the three-phase asynchronous motor is lower than the rotational speed of the rotating magnetic field. The rotor winding generates electromotive force and current due to the relative motion between the rotor winding and the magnetic field, and interacts with the magnetic field to generate electromagnetic torque to realize energy conversion.

Compared with single-phase asynchronous motors, three-phase asynchronous motors have better running performance and can save various materials. According to the different rotor structures, three-phase asynchronous motors can be divided into two types: cage type and wound type. The cage rotor asynchronous motor has simple structure, reliable operation, light weight and low price, and has been widely used. Its main disadvantage is the difficulty of speed regulation. The rotor of the wound three-phase asynchronous motor is also provided with three-phase windings like the stator and is connected with an external varistor through slip rings and brushes. Adjusting the varistor resistance can improve the starting performance of the motor and adjust the speed of the motor.
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