Copper to aluminum considerations, wire diameter change […]
Copper to aluminum considerations, wire diameter changes (because of the difference in conductor resistivity) aluminum wire diameter = copper wire diameter × 1.28 line groove planning changes (line diameter difference). In order to ensure the resistance of the original conductor, which leads to an increase in the wire diameter of the conductor, the groove fullness ratio is also increased to a certain extent.
Compared with copper, aluminum is very simple to oxidize, and welding is very difficult. Therefore, it is impossible to use the original copper wire welding process and materials. It is necessary to use aluminum solder wire for soldering materials and processes. As far as the aluminum enameled wire is concerned, compared with copper, the resistivity is different.
Therefore, the copper-to-aluminum enameled wire only needs to increase the wire diameter of the aluminum wire according to the specific resistance ratio, and the aluminum wire is not in various aspects such as temperature rise, current, energy efficiency and the like. It will be worse than the copper wire, so in terms of planning, there is no problem with copper to aluminum, but because metal aluminum is extremely active, simple oxidation, and tin is very difficult, many companies have a headache for this problem. Therefore, the key to the use of aluminum enameled wire is how to deal with the welding problem of the joint.
Stripping, there are many factories that use high-temperature tin to heat. After the ironing, the Enameled aluminum wire turns yellow and black, the solder can not be used on the bottom, and some use the paint stripper. Because of the conflict, the temperature is very high, so the aluminum after the paint stripping On the one hand, the wire diameter is damaged, on the other hand, the appearance of the aluminum wire becomes black, the oxidation is severe, and it is extremely difficult to apply tin. The connection method is the first terminal riveting, the aluminum wire is quickly oxidized, and the other copper and aluminum potentials are greatly different. During the energization process, potential corrosion will gradually occur, the resistance of the junction point will gradually increase, and the temperature rise will become high, and eventually it will not be energized.