The three phases of an asynchronous motor are the stator, the rotor and the field. The stator is the stationary part of the motor in which the windings are housed. The rotor is the rotating part of the motor that contains the magnets. The field is the magnetic field generated by the stator windings. For more information about the asynchronous motor, please read the following words.
What is the significance of the three-phase asynchronous motor?
How does an asynchronous motor work?
What is the workflow of an asynchronous motor?
What is the significance of the three-phase asynchronous motor?
Asynchronous three-phase motors are widely used in industry as they have several advantages over other motor types. They are more efficient than single-phase motors and can be started without mechanical stress. Asynchronous three-phase motors also have a higher power density, which means they can be smaller at a given power.
How does an asynchronous motor work?
When a symmetrical three-phase alternating current is fed into the three-phase stator winding, a rotating magnetic field is generated that rotates clockwise along the inner circle space of the stator and rotor at a synchronous speed n1. Since the rotating magnetic field rotates at the speed n1, the rotor conductor is stationary at the beginning, so that the rotor conductor intersects the rotating magnetic field of the stator to generate an induced electromotive force (the direction of the induced electromotive force is determined by the right hand rule). Since both ends of the rotor conductor are short-circuited by the short-circuit ring, an induced current is generated in the rotor conductor under the action of the induced electromotive force, which basically corresponds to the direction of the induced electromotive force. The current-carrying conductors of the rotor are exposed to electromagnetic forces in the magnetic field of the stator (the direction of the force is determined by the left-hand rule). The electromagnetic force generates an electromagnetic torque at the rotor shaft, which drives the rotor to rotate in the direction of the rotating magnetic field.
What is the workflow of an asynchronous motor?
When the three-phase stator windings of the motor (each with a difference of 120 degree in electrical angle) are connected to the three-phase symmetrical alternating current, a rotating magnetic field is generated, and the rotating magnetic field will cut the rotor winding, thereby generating an induced current in the rotor winding (the rotor winding is closed). The current-carrying rotor conductor, under the action of the rotating magnetic field of the stator, generates an electromagnetic force, which creates an electromagnetic torque on the motor shaft, and drives the motor to rotate, and the direction of motor rotation is the same as that of the rotating magnetic field.
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