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Analysis of working principle and characteristics of AC asynchronous motor
Why is an AC asynchronous motor called an asynchronous motor? Dalan Motor tells you that because the speed of the AC asynchronous motor is less than the speed of the rotating magnetic field, it is called an asynchronous motor. It is basically the same as the induction motor. AC asynchronous motors are divided into 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 induction motor is further divided into a single-phase asynchronous motor, an AC-DC motor and a repeller motor. The working principle of the AC asynchronous motor is as follows: 1. When the three-phase asynchronous motor is connected to the three-phase AC power supply, the three-phase stator winding flows through the three-phase magnetomotive force generated by the three-phase symmetrical current and generates a rotating magnetic field. 2. The rotating magnetic field has a relative cutting motion with the rotor conductor. According to the principle of electromagnetic induction, the rotor conductor generates an induced electromotive force and generates an induced current. 3. According to the law of electromagnetic force, the current-carrying rotor conductor is subjected to electromagnetic force in the magnetic field to form electromagnetic torque, which drives the rotor to rotate. When the motor shaft has a mechanical load, it outputs mechanical energy outward. The characteristics of the AC asynchronous motor are as follows: 1. The asynchronous motor is an AC motor, and the ratio of the speed of the load to the frequency of the connected grid is not constant. It varies with the size of the load. The greater the load torque, the lower the rotor speed. 2. The stator winding of the ordinary 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. 3. Asynchronous motor has higher operating efficiency and better working characteristics, and it is close to constant speed running from no-load to full load, which can meet the transmission requirements of most industrial and agricultural production machinery. 4. Asynchronous motors are easy to generate various protection types to meet the needs of different environmental conditions. When the asynchronous motor is running, the reactive power must be drawn from the grid to make the power factor of the grid deteriorate. 5. The speed of the asynchronous motor has a certain slip relationship with the rotating magnetic field speed, and its speed regulation performance is poor. It is economical and convenient to use DC motors for transportation machinery, rolling mills, large machine tools, printing and dyeing and papermaking machinery that require a wide and smooth speed range. 6. 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. AC asynchronous motors are widely used in electric fans, refrigerators, washing machines, air conditioners, hair dryers, vacuum cleaners, range hoods, dishwashers, electric sewing machines, food processing machines and other household appliances, as well as various power tools and small electromechanical equipment. ----- Responsible Editor: Dalan Oil Pump Motor 02- Purchasing Consultant Copyright http:/(Dalan Motor) Reprint, please indicate the source http://news.chinawj.com.cn