Insulating materials are solids used to isolate different conductors. Generally, solid insulating materials are also required to have a supporting role. Because of the high density of solid insulating materials, the breakdown strength is much higher, and the insulation resistance, dielectric constant and the change range of solid insulating materials are very wide.
Solid insulating materials can be divided into two categories: inorganic and organic.
Inorganic solid insulating materials: mainly mica powder and mica products, glass, glass fiber and its products, as well as electric porcelain and alumina film. They are resistant to high temperature, not easy to age, and have considerable mechanical strength. Some materials such as, etc. have low cost and occupy a certain position in application.
The process of glass is simpler than that of ceramics and can be used for manufacturing. Glass fiber can be made into silk, cloth and tape, which has much higher heat resistance than organic fiber and plays an important role in the development of insulation structure to high temperature.
Organic solid insulation materials: in the 19th century, they were mainly natural, such as paper, cotton cloth, silk, curable vegetable oil, etc. These materials are flexible, can meet the requirements of application process, and are easy to obtain.
Silicone resin combined with less alkali glass cloth greatly improves the heat resistance grade of. The enamelled wire made of polyvinyl formal as paint base has opened up a broad prospect of enamelled wire, replacing the wire-covered wire and yarn-covered wire. The thickness of polyester film is only a few tens of microns. Using it to replace the original paper and cloth has greatly improved the technical and economic indicators of motors and electrical appliances. Polyacrylamide fiber paper, polyester film and polyimide film are used together to make the heat resistance grade of motor slot insulation become F grade and H grade respectively. Elastomer materials have a similar development, such as heat-resistant silicone rubber, oil-resistant nitrile rubber, and then fluororubber, ethylene-propylene rubber and so on.
The above is what Xiaobian will introduce to you about the types of insulation materials. If you have any questions, please feel free to inquire.