The Welding Of Motor Windings Determines The Life Of Motor

The Welding of Motor Windings Determines the Life of Motor

Motor winding welding is the key production process of the motor production process, such as the winding of the line and the line of welding, the line and the welding of the lead wire, copper strip rotor guide and end ring welding, etc., all these links will be directly related to the motor's operational reliability and quality level. Types or sizes of different motors, the welding process involved in each of the specificity, often can not simply equal treatment.

 

Welding methods can be divided into two categories: welding and brazing. Welding directly to the two workpieces melt together, the joint must be heated to the melting state of the metal and complete the weld. Brazing uses lower than the melting point of the base material for brazing metal materials, will be welded and brazing material heated to higher than the melting point of the brazing material, lower than the melting temperature of the base material, the use of liquid brazing material to wet the base material, fill the joints gap and diffusion of the base material to achieve the connection of the weld. Most of the motor winding welding brazing, although there are also welding, but in most cases to assist the hard brazing, to make up for the welding defects.

 

The welding method is suitable for, working current, high temperature, high reliability requirements of the occasion, but also most of the motor manufacturers use the welding method. Welding equipment for acetylene oxygen torch. Welding, in order to prevent burns near the head of the motor wire insulation, should be wrapped around the head of the line dipped in water asbestos rope. At the same time to prevent the solder and flux into the coil gap, scalding insulation and short circuit.

 

Tin soldering is easy to operate, solid welding point, so the most common application, but the working temperature is low. Commonly used soldering iron soldering, pouring tin. When the number of welded wires, can be used to pour tin method. Due to the limitations of the low melting point of the brazing material tin, only in small motors and low temperature rise of the motor windings are used.

 

When the winding wire is thin, arc welding can be used for welding. Arc welding is characterized by no flux, fast and convenient, but in parallel, more wires, if the operation is not skilled easy to miss the weld or weld is not secure.

 

 

When soldering, the first copper wire or copper lead to the connection part of the tin, then scrape the clean aluminum wire stranded in the copper wire, and make the aluminum wire slightly higher than the copper wire. Then lay a layer of aluminum welding powder, with gas welding neutral flame melting aluminum wire, so that the aluminum fusion in the top of the copper, forming a spherical welding point. This method is used in many motor factories to weld the wire to the lead wire.

 

Argon arc welding is based on the principle of ordinary arc welding, the use of argon on the protection of metal welding consumables, through the high current so that the welding consumables in the welded substrate melted into a liquid to form a molten pool, so that the welded metal and welding consumables to achieve the metallurgical combination of a welding technology, due to the high-temperature molten weld constantly sent up argon so that the welding consumables can not be contacted with the oxygen in the air, thus preventing the oxidation of the welding consumables. The welding for multi-turn winding welding quality has played a good role.

 

Induction brazing is the need to weld the metal workpiece (generally copper mostly) on the induction coil, through the high-frequency alternating current, generating an induction electromagnetic field, coupled with the surface of the workpiece to produce an induction electromotive force, the formation of induced vortex in the metal surface, relying on the vortex generated on the surface of the metal to generate heat in the welding part will generally be coated with welding powder, to be the workpiece to reach the brazing material melting temperature can be welded, induction brazing is the world's most Induction brazing is currently the world's cleanest and most environmentally friendly way of heating and welding. This type of welding in the copper rotor application more, because the welding at the same time on several welding points for simultaneous operation, process parameters of the consistency of better, but also effective deformation of the welded joints, no matter from the work efficiency, reliability and aesthetics and so on is a better process, but because of the relatively high cost of the equipment, the corresponding cost of the induction coil is also particularly expensive, so not every manufacturer to use the welding technology.

 

Medium-frequency induction brazing equipment is to clean the surface of the workpiece to lap type assembly together, the brazing material is placed near the joint gap or between the joint gap.

 

Medium-frequency induction brazing equipment can replace the backward heating means such as oxyacetylene heating, coal oven heating and box-type electric furnace heating for brazing and quenching heat treatment. It can greatly improve product quality, effectively save electricity and improve labor conditions. When the workpiece and brazing material is heated to a temperature slightly higher than the melting point of the brazing material, the brazing material melts (the workpiece is not melted), and with the help of capillary action is sucked into and filled with solid workpiece gap between the liquid brazing material and the workpiece metal mutual diffusion and dissolution, the cold doubt that is the formation of brazed joints. Medium-frequency induction brazing equipment features: 1, due to the principle of medium-frequency induction heating for electromagnetic induction, the heat is generated by the workpiece itself, the heating method of heating speed, oxidation is very little, high heating efficiency, process repeatability, the metal surface is only a very slight decoloration, a slight polishing can be restored to the surface of the mirror bright, so as to effectively obtain a constant and consistent material properties. 2, uniform heating, temperature control High precision heating uniformity, to ensure that the heating core surface temperature difference is small. Through the temperature control system, the temperature can be precisely controlled to ensure that the product repeatability.

 

Medium-frequency induction brazing ground bare copper rotor guide bar welding on the application of more, the welding method of the guide bar cutting, molding and related and the shape of the head set is more demanding, otherwise the welding effect will be greatly reduced.

 

Comprehensive information content, each motor manufacturer should be combined with their respective equipment characteristics, product characteristics of a comprehensive evaluation, but the reliability of the welding quality is the key technology of manufacturing.