Asynchronous motor application field
An asynchronous motor is an AC motor whose ratio of the speed of the 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 rotor speed. Asynchronous motors include induction motors, doubly-fed induction motors, and AC commutator motors. Induction motors are the most widely used, and in general, induction motors are asynchronous motors without causing misunderstanding or confusion.
The stator winding of a common asynchronous motor is connected to the AC 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 are close to constant speed operation from no-load to the full-load range, which can meet the transmission requirements of most industrial and agricultural production machinery. Asynchronous motors are also easy to generate various protection patterns to suit the needs of different environmental conditions. When the asynchronous motor is running, you must draw the reactive power from the grid to make the power factor of the grid deteriorate.
Therefore, synchronous motors are often used for driving high-power, low-speed mechanical equipment such as ball mills and compressors. However, since the speed of the asynchronous motor has a certain difference in rotational speed with the rotating magnetic field, the speed regulation performance is poor (except for the AC commutator motor). Therefore, it is economical and convenient to use DC motors for transportation machinery, rolling mills, large-scale machine tools, printing and dyeing, and papermaking machinery that require a wide and smooth speed range. However, with the development of high-power electronic devices and AC speed control systems, the speed regulation performance and economy of asynchronous motors suitable for wide speed regulation are comparable to those of DC motors.
Asynchronous motors are mainly used as electric motors. Their power ranges from a few watts to tens of thousands of kilowatts. It is the most widely used electric motor in various industries and people's daily lives, providing power for various mechanical equipment and household appliances. For example, machine tools, small and medium-sized rolling mills, fans, pumps, light industrial machinery, metallurgy and mining machinery, etc., mostly use a three-phase asynchronous motor (AsynchronousMotor) to drag; electric fans, washing machines, refrigerators, air conditioners, and other household appliances are widely Use a single-phase asynchronous motor. Asynchronous motors can also be used as generators for wind power plants and small hydropower plants.
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