Enameled wire is the main raw material of products such as motors, electrical appliances and household appliances. Especially in recent years, the electric power industry has achieved sustained and rapid growth, and the rapid development of household appliances has brought a wider field of application of enameled wire, followed by Higher requirements are put forward for enameled wire. For this reason, the product structure adjustment of enameled wire is inevitable, and the raw materials (copper, lacquer), enamelling process, process equipment and testing methods that are matched with it are also in urgent need of development and research. The quality characteristics of various enameled wires are different, but they all have four major properties: mechanical properties, chemical properties, electrical properties, and thermal properties. First of all, let’s take a look at the mechanical properties of enameled wire.
Mechanical properties: including elongation, rebound angle, softness and adhesion, scratch paint, tensile strength and other items. The elongation reflects the plasticity of the material and is used to assess the ductility of the enameled wire. The rebound angle and softness reflect the elastic deformation of the material, which is used to evaluate the softness of the enameled wire. The quality of elongation, rebound angle and softness reflects the quality of copper and the degree of annealing of enameled wire. The main factors affecting the elongation and springback angle of enameled wire are (1) wire quality; (2) the influence of external force; (3) the degree of annealing.
The toughness of the paint film includes winding and stretching, that is, the allowable stretching deformation of the paint film with the stretching deformation of the conductor without cracking. The adhesion of the paint film includes sudden breaking and peeling, and the main assessment is the ability of the paint film to adhere to the conductor. The scratch resistance test of the enameled wire paint film reflects the strength of the paint film against mechanical scratches.
Therefore, the film of the enameled wire should be scratch-resistant, elastic and suitable for softness and elongation, so as to ensure that the paint film can withstand friction, bending, stretching and compression during the process of winding, embedding, stretching and shaping. and so on without causing damage. This has good mechanical properties. It is suitable for coil windings of motors and instrument communication equipment that work under high temperature for a long time.