The basic structure of a three-phase motor

The three-phase asynchronous motor consists of two basic parts, a fixed stator and a rotating rotor, the rotor is installed in the stator cavity and supported on the two end covers with the help of bearings. In order to ensure that the rotor can rotate freely in the stator, there must be a gap between the stator and the rotor, called an air gap. The air gap of the motor is a very important parameter, and its size and symmetry have a great influence on the performance of the motor. Figure 2 shows the components of a three-phase cage asynchronous motor.