Introduction to AC motors
AC motor: AC motor is divided into synchronous and asynchronous motors. Synchronization is mainly used as generator, and asynchronous is mainly motor. I mainly talk about asynchronous motors. Because of their simple structure, low price, easy maintenance and reliable operation, asynchronous motors have been widely used. Although the China ac motor has a simple structure, the working principle is actually more complicated than that of the DC motor. If it is to be understood clearly, it is more difficult.
A three-phase symmetrical alternating current is applied to the stator of the alternating current motor, and the stator is stationary. Only a change in current can produce a rotating synthetic magnetic field, which is like a magnet that rotates around the stator. With this rotating magnet, everything is easy to handle. A closed coil is placed inside the stator. In this closed coil, the electromotive force and current are induced, and electromagnetic force is generated. The closed coil will rotate. It can also be understood that there is a rotating magnet on the stator. The rotor closed coil is actually an electromagnet due to induction charging. When the outer electromagnet is rotating, it will turn with the electromagnet inside, so the China ac motor The rotor is turning. The rotational speed of the stator magnetic field is called synchronous speed. The inner rotor is actually driven by the stator magnetic field, so its rotational speed will be slower than the stator magnetic field, so it is called asynchronous speed. So there is the name of the asynchronous motor.
The rotor of an AC motor is such a simple closed coil, or a closed conductor, like a rat cage, so it is also called a squirrel cage asynchronous motor. In addition, since the electromotive force and current inside the rotor are induced by the stator magnetic field, the asynchronous motor is called an induction motor. Therefore, the names of three-phase asynchronous motors are quite numerous: China ac motor, asynchronous motors, induction motors, all of which are said to be names from different angles.
