The motor is the prime mover that uses the principle of electromagnetic induction to convert electrical energy into mechanical energy and output mechanical torque. According to the nature of the current used by the motor, it can be divided into two categories: AC motors and DC motors. The number of power phases used by AC motors can be divided into single-phase motors and three-phase motors. Three-phase motors are divided into synchronous motors and asynchronous motors. Two kinds of motors.
Three-phase asynchronous motors have the advantages of simple structure, reliable work, convenient use and maintenance, etc. Therefore, it has been widely used in industrial and agricultural production and life.
The stator of a three-phase asynchronous motor is composed of a frame, an iron core and a stator winding. The frame is generally made of cast iron and cast steel. Its function is to fix the iron core and the stator winding and support the terminal shaft with the front two end covers. The outer surface is cast with heat dissipation ribs to increase the heat dissipation area and improve the heat dissipation effect. The stator iron core is the magnetic part of the motor. The iron core is fixed in the frame. It is superimposed by insulating silicon steel sheets on the surface. The inner circle of the silicon steel sheets is punched with evenly distributed notches for embedding three symmetrical parts. Phase stator winding. The stator winding is the circuit part of the motor. It consists of three-phase stator windings. The three-phase windings are once embedded in the stator slot at a certain spatial angle and are intimately insulated. The three-phase winding has a total of six outlet ends leading out of the casing and connected to the junction box of the base. The first and the end of each phase winding are marked with symbols U1-U2, V1-V2, W1-W2, and the wiring form should be in accordance with the motor The instructions on the nameplate are connected into a star or triangle shape.
The rotor is the rotating part of the asynchronous motor. It is composed of the rotor, the rotor core and the rotor winding. Its function is to output mechanical torque. The rotor core is a cylinder with mutually insulated silicon steel sheets mounted on the rotor shaft. There are uniform grooves on the outer circle of the silicon steel sheet, which are used for inserting the rotor windings. They are called wire slots. The rotor windings are divided into two types according to the structure. The winding type and the cage type. The winding rotor winding and the stator winding are similar. , The symmetrical three-phase windings are embedded in the rotor core wire trough. The cage-type rotor winding is made of copper or aluminum bars embedded in the rotor wire trough and welded with metal rings at both ends. It is shaped like a cage. The rotor and the wound rotor are only different in structure, and their working principles are the same.