& nbsp; at present, there are three main types of insulating materials: inorganic insulating materials, organic insulating materials and mixed insulating materials. For these three types of insulation materials, their own characteristics are different, and their application fields are also different.
　　(1) Inorganic insulating materials: mica, porcelain, asbestos, marble, glass, sulfur, etc. Used for winding insulation of motor and electrical appliances, switch floor and insulator, etc.
(2) Organic insulating materials: rubber, resin, shellac, cotton yarn, paper, hemp, silk, rayon tube, etc. It is used for manufacturing insulating paint, outer insulation of winding conductor, etc.
(3) Mixed insulating materials: moulded insulating materials processed by two kinds of insulating materials. Used for the base, housing, etc. of electrical appliances.
& nbsp; & nbsp; & nbsp; generally, these different typesInsulating materialsAll of them can be used in electronic devices to block the passage of current. In addition, the resistivity of most insulating materials is relatively high, usually in the range of 10-10_.m. Therefore, in some motor applications, it is better to isolate the insulation material around the conductor from the grounded stator core, so as to ensure the safe and long-term operation of the motor.