The China 110v dc motor suppliers tells you the basic principles of asynchronous Motors.
AC Asynchronous Motor
AC asynchronous motor is an electric motor that runs at the leading AC voltage. It is widely used in electric fans, refrigerators, washing machines, air conditioners, hair dryers, vacuum cleaners, smoke machines, dishwashers, electric sewing machines, food processors, and other household appliances and various electrical tools. Small electromechanical equipment.
The AC induction motor is divided into an induction motor and an AC changer motor. Induction motors are further divided into single-phase asynchronous Motors, AC and DC dual-use Motors, and repulsion Motors.
The speed of the motor(rotor speed) is less than the speed of the rotating magnetic field, so it is called an asynchronous motor. It is basically the same as the induction motor. S =(ns-n) / NS. S is the transition rate, NS is the magnetic field speed, and N is the rotor speed.
Basic principles:
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 magnetomagnetic potential(stator rotating magnetomagnetic potential) generated by the three-phase symmetric current and generates a rotating magnetic field.
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 rotor conductor carrying the flow is affected by the electromagnetic force in the magnetic field, forming an electromagnetic torque, driving the rotor rotation, when the motor shaft with mechanical load, it output mechanical energy outward.
Asynchronous motor is an AC motor. The ratio of the speed of the load to the frequency of the connected grid is not constant. It also varies with the size of the load. The higher the load torque, the lower the rotor speed. Asynchronous motor includes induction motor, double-feed asynchronous motor and AC changer motor. Induction motors are the most widely used. Induction motors are generally referred to as asynchronous Motors without causing misunderstanding or confusion.
The stator windings of ordinary asynchronous motors are connected to the AC grid, and the rotor windings do not need to be connected with other power sources. Therefore, it has the advantages of simple structure, convenient manufacturing, use and maintenance, reliable operation, low quality and low cost. Asynchronous motor has higher operating efficiency and better working characteristics. It can meet the transmission requirements of most industrial and agricultural production machinery from empty load to full load range near constant speed. Asynchronous Motors also facilitate the generation of various types of protection to meet the needs of different environmental conditions. When the asynchronous motor is running, it is necessary to absorb the power from the power grid without power excitation, so that the power factor of the power grid becomes worse. Therefore, synchronous motors are often used to drive high-power and low-speed mechanical equipment such as ball mills and compressors. Because the speed of the asynchronous motor has a certain difference with its rotating magnetic field speed, its speed regulation performance is poor(except for the AC changer motor). For transportation machinery, rolling Mills, large-scale machine tools, printing and dyeing, and papermaking machines that require a wider range of speed regulation, DC motors are more economical and convenient. However, with the development of high-power electronic devices and AC speed regulation systems, the speed regulation performance and economy of the asynchronous motor suitable for Yukuan speed regulation can be compared with that of DC motor.
