A process method for preventing end pieces from escaping the stator core of a large motor

Abstract

The invention discloses a process method for preventing end pieces from escaping the stator iron core of a large motor, which is an innovation in the bonding process method of the end pieces of the stator iron core of a large motor, and breaks the conventional bonding between the end pieces with a silicon steel sheet insulating paint film. way, using the paint-free bonding technology between the end pieces. The invention adopts the surface drawing process of the end piece to effectively remove the burr, and increases the adhesion of the adhesive on the surface of the end piece. The air-drying treatment and vacuum anastomosis bonding technology is adopted for the end pieces after gluing, which avoids the phenomenon of bulging bubbles in the internal shape after the end pieces are bonded, and increases the adsorption force between the end pieces. The invention adds insulating positioning pins and rib plugs to the end piece, thereby enhancing the integrity of the end piece. The invention adopts the magnetization heating test of the stator core to effectively detect the heating phenomenon inside the end piece, and solves the problem that people cannot check the quality of the internal bonding of the end piece. The present invention is a new technical solution with strong practicability and easy promotion.

Description

Technical field: [0001] The invention relates to the field of motors, in particular to a process method for preventing end pieces from escaping for a stator core of a large motor. Background technique: [0002] After the large motor is put into operation, the temperature of the stator core is generally around 70°C, and the temperature difference with the surrounding environment is large. After frequent starting and stopping and long-term operation, the stator is too much in a state of thermal expansion and contraction. , Due to the influence of the large temperature difference between the stator punch and the stator base, the two cannot synchronously expand and contract, and the internal stress of the stator is unevenly distributed, resulting in a huge interaction force. Under the condition of long-term operation and vibration, the bonding effect of the stator core end pieces is not good, and the phenomenon of loosening occurs, so that the dovetail groove of the end piece is...

AI Technical Summary

Problems solved by technology

[0002] After the large-scale motor is put into operation, the temperature of the stator core is generally around 70°C, which has a large temperature difference with the surrounding environment. After frequent start-up and shutdown and long-term operation, the stator is too much in a state of thermal expansion and cold contraction , due to the influence of the large temperature difference between the stator punching sheet and the stator frame, the two cannot simultaneously expand and contract with heat and cold, and the internal stress of the stator is unevenly distributed, resulting in a huge interaction force, coupled with the instantaneous impact force of the start-up and shutdown unit and the unit Under the condition of long-term operation and vibration, the bonding effect of the end pieces of the stator core is not good, and loosening occurs, so that the dovetail grooves of the end pieces break free from the control of the positioning ribs, and the stator end pieces move away from the stator core of the motor. The protruding end piece cuts the insulation of the wire rod, causing the winding to ground short-circuit shutdown accident. This phenomenon is especially obvious on large horizontal perfusion units.

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