Basic structure of three-phase asynchronous motor

1. Stator (stationary part) (1) Stator iron core function: It is a part of the motor magnetic circuit and on which the stator winding is placed. Construction: The stator core is generally made by punching and laminating silicon steel sheets with insulation layers on the surface of 0.35~0.5 millimeters thick. There are evenly distributed slots punched in the inner circle of the core for embedding the stator winding. There are several types of stator core slots: semi closed slot, semi open slot, and open slot. (2) Stator winding function: It is the circuit part of the electric motor, which is supplied with three-phase AC power to generate a rotating magnetic field. Construction: It is composed of three identical windings arranged in a symmetrical manner at an electrical angle of 120 ° in space. The coils of these windings are embedded in the slots of the stator according to certain rules. (3) The function of the machine base is to fix the stator iron core and the front and rear end caps to support the rotor, and to provide protection, heat dissipation, and other functions.

2. Rotor (rotating part) (1) The rotor iron core of a three-phase asynchronous motor: serves as a part of the motor's magnetic circuit and places the rotor winding in the iron core slot. (2) The function of the rotor winding of a three-phase asynchronous motor is to cut the rotating magnetic field of the stator, generate induced electromotive force and current, and form electromagnetic torque to rotate the motor. Construction: divided into squirrel cage rotor and wound rotor.

3. End caps for other accessories of three-phase asynchronous motors: supporting function. Bearing: Connecting the rotating and stationary parts. Bearing end cap: protects the bearing.