Structure of three-phase asynchronous motor for seafood and food machinery
Structure of three-phase asynchronous motor of Marine food machinery; A three-phase cagevacuum packaging machineasynchronous motor structure diagram, it is mainly composed of stator and rotor two parts, stator and rotor between the air gap. In addition, there are end cover, bearing, frame, fan and other parts.
1. Structure of three-phase asynchronous motor of seafood and food machinery, stator part of three-phase asynchronous motor of packaging machine
Structure of three-phase asynchronous motor of Marine food machinery; The stator of three-phase induction motor of vacuum packing machine is composed of stator core, stator winding and frame. Stator core is part of the magnetic circuit of the motor, a rotating magnetic field of stator core with synchronous rotation speed, therefore, alternating magnetic flux for core, in order to reduce the loss of the core of the stator core three do by 0.5 mm thick silicon steel sheet with better permeability properties of the overlying, power is larger also in silicon steel sheet (also known as a plate) on both sides of the coated with varnish. There are many slots of the same shape evenly punched along the inner circular side of the stator core for embedding the stator windings. FIG. 22 shows stator core and silicon steel sheet. The stator winding is the circuit part of the motor, which is embedded in the inner groove of the stator core. The stator winding of medium and small asynchronous motors is wound by high-strength enameled wire, which is symmetric and evenly embedded in the stator core slot, forming 120 electric angles between each phase. The first end of the three windings is represented by Ul, V1 and W1, and the end is represented by U2, V2 and W2. There are six outgoing ends of the three phases fixed in the junction box, and the stator windings can be connected into stars or triangles.
Structure of three-phase asynchronous motor of Marine food machinery; The automatic vacuum packing mechanical and electrical machine is generally made of cast iron, and the large motor is welded with steel plate.
2. Structure of three-phase asynchronous motor of seafood and food machinery, rotor part of three-phase asynchronous motor of vacuum packaging machine
Structure of three-phase asynchronous motor of Marine food machinery; For example, air-controlled vacuum packaging machine, box packaging machine rotor is mainly composed of rotor core, rotor winding, rotating shaft and fan. The core of the rotor is also a part of the magnetic circuit of the motor. It is formed by punching a uniform groove shape on the outer circumference, which is overlaid with 0.5m thick silicon steel sheet and fixed on the rotating shaft. According to the different structure of rotor winding, asynchronous motors can be divided into cage type asynchronous motors and wound rotor asynchronous motors.
Structure of three-phase asynchronous motor of Marine food machinery; Vacuum packaging machine three-phase asynchronous motor cage rotor winding is placed in the slot of the rotor guide bar, the two ends of the guide bar with short circuit ring short connected, forming a closed polyphase short circuit winding, such as remove the core, rotor winding is like a squirrel cage, so called cage rotor. The material of the guide bar and end ring can be copper or aluminum. Generally, medium and small motors adopt cast aluminum rotor, which is directly cast in the core groove of the rotor with molten aluminum, together with the end ring and the wind blade.
Structure of three-phase asynchronous motor of Marine food machinery; Vacuum packaging machine type three-phase asynchronous motor is similar to the stator winding and rotor winding, is composed of insulated wire winding, embedded in the rotor slot, according to fixed rule of the three-phase symmetric winding, usually the end of the third phase winding together, into a star, the first of the three winding end respectively and fixed on the rotating shaft of three insulated collector ring connect with each other, then through a set of brush to draw connected with external circuit. The purpose of series resistance is to change the starting performance and speed regulating performance of the motor. The shaft is made of mild steel of higher strength and rigidity.
Structure of three-phase asynchronous motor of Marine food machinery; The asynchronous motor is attached with a cover, mounted on both sides of the frame, and a bearing in the middle to support the rotation of the rotor.
3. Structure of three-phase asynchronous motor for seafood and food machinery; Air gap of three-phase asynchronous motor of vacuum packing machine
Structure of three-phase asynchronous motor of Marine food machinery; The air gap of the induction motor is uniform, which is generally measured by the small allowable value of the mechanical condition. Because of the large air gap, the required excitation current is also large, thus affecting the power factor of the grid. In order to improve the power factor, the air gap should be as small as possible, but it should not be too small. Otherwise, friction or collision may occur to the stator rotor during high-speed operation. The air gap of medium and small motors is generally 0.2-2.5mm.