Motor is the most widely used, wide

Motor is the most widely used, widely used in all walks of life, driving a variety of production machinery, is the main load of the power system, therefore, this chapter mainly introduces the working principle of asynchronous motor.Induction motors, also known as induction motors, are mainly divided into two types: winding type and squirrel-cage type. No matter what kind of asynchronous motor it is, it is made up of two parts: the fixed part is called the stator, the rotating part is called the rotor, and the small space between the stator and the rotor is called the air gap.(1) asynchronous motor statorThe stator of asynchronous motor includes stator core, stator winding and stator frame.The stator core, as a part of the magnetic circuit of the motor, is used to place the stator windings. The stator winding is the circuit part of the asynchronous motor. Its main function is to use the rotor winding to generate the electromotive force and realize the electromechanical energy conversion of the motor through the current. The main function of the frame is to fix and support the stator core, which is responsible for the internal loss of the motor as it runs through the core, and the heat from the base to the surrounding air.(2) asynchronous motor rotorThe rotor of asynchronous motor includes rotor core, rotor winding, rotor shaft and so on.The rotor core and the stator core function in the same way. They are also used as part of the magnetic circuit of the motor to place the rotor windings. The rotor windings, like the stator windings, form part of the circuit of the asynchronous motor, generating electromotive force with the stator windings and generating electromagnetic torque through the current. There are two types of construction: winding and squirrel-cage. The squirrel cage rotor windings do not need external power supply, so they can be closed by themselves to form a short-circuit winding. Winding and rotor winding of the stator winding and rotor core embedded in the slot insulated wire, connect to the three-phase symmetric winding star connection method, and then respectively three output terminals connected to the slip ring rotor shaft, then th(2) asynchronous motor rotorThe rotor of asynchronous motor includes rotor core, rotor winding, rotor shaft and so on.The rotor core and the stator core function in the same way. They are also used as part of the magnetic circuit of the motor to place the rotor windings. The rotor windings, like the stator windings, form part of the circuit of the asynchronous motor, generating electromotive force with the stator windings and generating electromagnetic torque through the current. There are two types of construction: winding and squirrel-cage. The squirrel cage rotor windings do not need external power supply, so they can be closed by themselves to form a short-circuit winding. Winding and rotor winding of the stator winding and rotor core embedded in the slot insulated wire, connect to the three-phase symmetric winding star connection method, and then respectively three output terminals connected to the slip ring rotor shaft, then the current leadership through the brush, its characteristic is through the slip ring and brush connect additional resistance in the rotor winding circuit, improve the start performance of motor or adjust the rotation speed of motor.(3) air gap of asynchronous motorThe size of air gap has great influence on the performance of asynchronous motor. In order to reduce the no-load current of the motor and improve the power factor of the motor, the air gap should be as small as possible. However, if the additional loss caused by the vibration of the magnetic field pulse and the magnetic leakage caused by the high harmonic field are considered, a slightly larger air gap is a good thing. Therefore, the size of air gap should be optimized according to the specific situation of asynchronous motor.