The purchase of induction engines by the stator and rotor, bearing composition.The stator is mainly composed of iron core, three-phase winding, frame and end cover.The stator core is generally made of 0.35~0.5 mm thick silicon steel sheet with insulating layer on the surface and laminated, and there are evenly distributed grooves punched in the inner circle of the core for nesting stator windings.The three-phase windings are connected by three identical structures spaced at an electrical Angle of 120° and arranged in parallel with each other. Each coil of these windings is embedded in each slot of the stator according to certain rules.Its function is to switch on three-phase alternating current and generate a rotating magnetic field.The frame is usually cast iron, the frame of large asynchronous motor is generally welded with steel plate, the frame of micro motor is cast aluminum, its role is to fix the stator core and front and rear end cover to support the rotor, and play protection, heat dissipation and other functions.There are cooling bars outside the frame of the enclosed motor to increase the heat dissipation area, and there are ventilation holes at both ends of the frame of the protective motor to make the air inside and outside the motor convection directly, so as to facilitate heat dissipation.The end cover is mainly used to fix the rotor, support and protect it.The rotor is mainly composed of iron core and winding.The core of the rotor is made of the same material as the stator, which is made of 0.5 mm thick silicon steel sheet with evenly distributed holes punched outside to place the rotor windings.The stator core is usually punched with the inner circle of silicon steel sheet.Generally, the rotor core of a small asynchronous motor is directly pressed on the shaft, while the rotor core of a large and medium-sized asynchronous motor (with a rotor diameter of more than 300~400 mm) is pressed on the shaft by means of a rotor bracket.The rotor winding is divided into squirrel cage rotor and wound rotor.
