Asynchronous motor application

Asynchronous motor is a kind of alternating current motor, and the ratio of its speed at load to the frequency of the connected grid is not constant. It also changes with the size of the load. The greater the load torque, the lower the speed of the rotor. Asynchronous motors include induction motors, doubly-fed asynchronous motors and AC commutator motors. Induction motors are the most widely used. Generally speaking, induction motors can be called asynchronous motors without causing misunderstanding or confusion.

The stator winding of the ordinary asynchronous motor is connected to the AC power grid, and the rotor winding does not need to be connected to other power sources. Therefore, it has the advantages of simple structure, convenient manufacture, use and maintenance, reliable operation, low quality and low cost. Asynchronous motors have higher operating efficiency and better working characteristics. They run near constant speed from no load to full load, and can meet the transmission requirements of most industrial and agricultural production machinery. Asynchronous motors are also easy to generate various protection types to meet the needs of different environmental conditions. When the asynchronous motor is running, the reactive excitation power must be drawn from the power grid to make the power factor of the power grid worse. Therefore, synchronous motors are often used to drive high-power, low-speed mechanical equipment such as ball mills and compressors. Since the speed of the asynchronous motor has a certain slip relationship with the speed of its rotating magnetic field, its speed regulation performance is poor (except for AC commutator motors). For transportation machinery, rolling mills, large-scale machine tools, printing and dyeing and papermaking machinery that require a wide and smooth speed range, it is more economical and convenient to use DC motors. However, with the development of high-power electronic devices and AC speed regulation systems, the speed regulation performance and economy of asynchronous motors suitable for wide speed regulation are comparable to those of DC motors.

Asynchronous motor

Asynchronous motors are mainly used as motors, and their power ranges from a few watts to tens of thousands of kilowatts. They are the most widely used motors in various industries and people's daily lives in the national economy, providing power for a variety of mechanical equipment and household appliances. For example, machine tools, small and medium-sized steel rolling equipment, fans, water pumps, light industrial machinery, metallurgy and mining machinery are mostly driven by three-phase asynchronous motors (Asynchronous Motor); electric fans, washing machines, refrigerators, air conditioners and other household appliances Single-phase asynchronous motors are widely used. Asynchronous motors can also be used as generators for wind power plants and small hydropower stations.