Induction motors, also known as "asynchronous motors," are devices that place the rotor in a rotating magnetic field and obtain a rotational torque under the action of the rotating magnetic field, thereby causing the rotor to rotate. The rotor is a rotatable conductor, usually in the shape of a squirrel cage. Invented by electrical engineer Nikola Tesla in 1887. The entry introduces the concept, inventor, working principle, basic structure, working mode, braking mode, asynchronous characteristics, specifications, and fault inspection of induction motors.

The three-phase asynchronous motor mainly consists of stator, rotor, and bearing. The stator mainly consists of an iron core, three-phase winding, frame, and end cover. The stator core is generally made of 0.35-0.5mm thick silicon steel sheets with an insulating layer on the surface and laminated. There are evenly distributed slots punched in the inner circle of the core to embed the stator winding. The three-phase winding is composed of three identical windings arranged in a symmetrical array spaced apart by 120 ° in space. Each coil of these windings is embedded in each slot of the stator according to a certain rule. Its function is to apply three-phase alternating current to generate a rotating magnetic field.