Repair method of cage asynchronous motor

Abstract

The invention relates to a cage asynchronous motor repairing method. The cage asynchronous motor repairing method includes a preparation step, a repairing step and a detection step. The preparation step includes that detecting and confirming open weld positions of a cage bar or copper bar and an end ring; restoring the deformed cage bar or copper bar; detecting the end ring deformation degree, and rounding the deformed end ring. The repairing step includes that placing a rotor on a lathe, and aligning; increasing the sectional area at the open weld break part; welding copper rods at the machining surface of an end ring and copper bar machine along the circumferential angle by 360 degrees. The detection step includes that detecting the open weld break part; confirming the good welding between contact surfaces. According to the cage asynchronous motor repairing method, through analyzing the cage bar or copper bar break to confirm a construction scheme and provide a concrete repairing technique and using copper rods to repair and reinforce the cage bar or copper bar, the cage bar or copper bar is difficult to be damaged again after finishing repairing, the service life is greatly improved, and a lot of time and investment are saved for an enterprise.

Description

technical field [0001] The invention relates to a motor repair method, in particular to a cage-type asynchronous motor repair method. Background technique [0002] The asynchronous motor is an AC motor that generates electromagnetic torque through the interaction of the air gap rotating magnetic field and the induced current of the rotor winding, thereby realizing the conversion of electromechanical energy into mechanical energy. Widely used in power plants, large steel rolling, fans, metallurgy and other equipment. [0003] Asynchronous motors, especially squirrel-cage asynchronous motors, often cause accidents due to open welding and fracture of rotor cage bars (copper bars) and end rings, which affect production. [0004] The squirrel-cage motor of asynchronous motor has a high accident rate due to the better process design of the motor rotor from German Siemens and the slightly worse domestic motor cage (copper bar). [0005] Many manufacturers adopt repair welding or ...

AI Technical Summary

Problems solved by technology

The longer the starting time, the greater the starting current, and the greater the bending deformation. At the same time, if the motor starts frequently and the temperature rises, the deformation of the end ring is more likely to occur.

For a long time, the brazing joint will melt, and the cage or copper bar will be welded to the end ring.

[0008] 2. The cage bar (copper bar) is not only affected by electromagnetic radial force and centrifugal force during the start-up process, but also affected by thermal stress that is difficult to calculate and predict, which causes the cage bar (copper bar) to open welding and break.

[0009] 3. Due to the insufficient mechanical strength of the cage bar (copper bar) itself, it will also cause the bending and fracture of the cage bar (copper bar)