Everyone is no stranger to copper magnet wire. It is very common in electrical appliances, electrical instruments and telecommunications industries. Because of its use in these industries, the performance of enameled wires should meet the design requirements, processing requirements and operating requirements of electrical products. It also requires the enameled wire user unit to require the quality of the enameled wire to be guaranteed through a serious system and scientific means. If the wire is insufficiently toughened, the elongation is too small, and the thin wire may be broken during winding and excessive toughening. , The elongation is too large, it is easy to thin the section, resulting in an increase in resistance. Today we will verify its flexibility test. The paint film on the rear outer edge is stretched, and the paint film on the inner edge is compressed. If the elasticity is not good, the paint film will also crack. In addition, you need to pay attention to the difference of materials. Thin wires are easy to be stretched. Use the elongation method to test. Thick wires are greatly affected by bending. The elongation of the paint film increases with the decrease of the winding diameter. Factors affecting the elasticity of the paint film, the flexibility of the paint film. The shape of a polymer chain is constantly moving, and there are more curls during movement, and the polymer can stretch within a certain range when subjected to external forces. The stronger the curl, the larger the stretch range, the higher the flexibility, and the better the elasticity. Because of the low entry requirements of the cable and wire manufacturing industry in my country, the investment in production scale projects cannot be controlled, the situation of moderately repeated capital construction is relatively serious, the market concentration is not high, and many do not have the necessary methods such as production volume, quality management and inspection. The "manufacturing enterprises" are also mixed in. Companies and agents that manufacture in accordance with regulations are struggling. In addition, foreign-funded enterprises are racing to enter the Chinese sales market and have a relatively dominant market share in the high-end sales market. In my country, there are only a few types of cables that can be accepted by foreign markets and can participate in market competition. There is still a big difference in comparison with international famous brands in the types of cables with excellent performance, high quality and high efficiency. In addition, with the successive implementation of the WEEE orders, ROHS orders, EUP orders, etc. of the European Union countries, a wave of emerald green has been blown around the world, and many Chinese aluminum winding wire manufacturers have suffered a round of trade in the entire import and export process. Barriers and weakened international competitiveness.
In recent years, the development of nanotechnology has created conditions for the improvement and improvement of enameled cca wire used in variable frequency motors. The development of homogeneous, transparent and better coating paint is not only conducive to the production of wires, but also enables the performance of enameled cca wire More excellent, and may produce new characteristics, thereby expanding the application of enameled wire. Faced with foreign advanced technology, many domestic companies have also started, relying on foreign experience, using imported paint, and developing enameled wires for high-frequency motors. Relevant domestic research institutions, Shanghai Electric Institute and Shanghai Electric Cable Research Institute have also carried out research work to varying degrees. Starting from the research on insulating paint, they are preparing for the establishment of test bases and formulating relevant standards for wires and motors. The work is proceeding one after another, and some results have been achieved. Enameled wires for variable frequency motors have made great progress in China through several years of hard work. However, due to factors such as price and application range, it is still in the research and development stage. The development of enameled wire is still waiting for the expansion of the application field. For example, inverter air conditioners and inverter refrigerators, which are very popular in the household appliances market, are developing very fast, but it is not known whether the inverter enameled wire has been used. But it is certain that the high-power variable frequency motors used in metallurgy, steel rolling, mining, railways, transportation and other industries have adopted or are preparing to use variable frequency motor enameled wires, and most of them are imported from abroad. Due to the large increase in aluminum winding wire, aluminum wire has the advantages of small proportion, low price, rich resources, and the needs of special occasions, aluminum as the conductor of the winding wire has risen again. There are already motors in Yantai Dongshan and Tongling in China. Jingda, Wuxi Jufeng, etc. produce fully enameled aluminum wire, Tianjin Jingwei electromagnetic wire produces wrapped aluminum wire, the situation is promising, mainly used in microwave oven transformers, reactors, degaussing coils, electroacoustic devices, lighting rectifiers and other occasions.