Insulation properties and characteristics of mica materials

Mica tape manufacturer's mica material is an important insulation material for high-voltage motor windings. It is mainly used for insulation wrapping of high-voltage motor coils. The rated current is different, and the floor difference of the coil wrapping mica material is different.

Mica material of mica tape manufacturer has the advantages of insulation, heat resistance, stable physical quality, etc., and has good fire resistance, toughness and ductility. It is widely used in decoration industry, fire protection industry, welding rod, plastic, electrical insulation, paper industry, asphalt paper, plastic, pearlescent pigment and other industrial products. Insulation of high-voltage motor windings is one of the practical applications of mica materials.

The mica material for high-voltage motor windings is generally strip-shaped and is used for the insulation solution of high-voltage motor coils. The insulation solution is carried out after the high-voltage motor coil is formed and peptized. Compared with the coils of high-rated current motors, the number of superimposed layers of the wrapped mica material will be More.

According to the difference of processing technology of various manufacturing enterprises, the bandaging of mica materials generally adopts manual, semi-manual, semi-mechanical and automatic bandaging methods. Relatively speaking, in the process of manual bandaging, some possible inappropriations of coils or insulating materials can be found early, but the level of tightness and extrusion consistency of the bandaging are not well grasped, and there are many human factors; when semi-automatic and fully automatic assembly lines are selected to carry out wrapping coils, the wrapping efficiency is relatively high, and the wrapping tape extrusion consistency is relatively good. Therefore, automatic wrapping machines and equipment are gradually entering high-voltage motor manufacturing enterprises. However, no matter what kind of wrapping method, the top of the coil is only handmade and wrapped, which is due to the particularity of the top appearance and the difficulty of wrapping. However, the magnetic field strength of the high-voltage motor is very uneven at the top of the winding resistance, which is easy to generate corona discharge parts, which is the key to the production and manufacture of winding resistance.

The mica material of the mica tape manufacturer has its own insulation characteristics and soft characteristics, which can ensure that the coil has a good touch with the iron core and has better insulation characteristics when it is placed in the iron core. In order to ensure better insulation characteristics of winding resistance and reasonably avoid electric corrosion during motor operation, every effort should be made to reduce the probability of voids in the coil wrapping process and ensure the actual effect of the arrangement of mica material layers and layers in the wrapping process. In the soaking and drying process of motor windings, especially for the selection of vacuum pressure equipment technology, the deficiency in the whole process of insulation wrapping can be filled.

In order to strengthen the insulation characteristics of the motor insulation and avoid the corona discharge problem caused by the operation of the high-voltage motor, the resistance tape is wrapped after the mica material is wrapped. Part of the parallel wire edge of the coil is wrapped with low insertion loss, while the top of the coil is wrapped with high insertion loss. In the bandaging process, the socket positions of high insertion loss and low resistance bands must be manipulated in time to prevent bandaging gaps. The resistance band wrapped around the coil can effectively alleviate the contact between the coil and the iron core, reduce the gap between the coil and the iron core, and play a certain buffering effect on the mica insulation material. In the manufacturing process, when the gap between the coil and the iron core is large, the necessary countermeasures should also be used to carry out insulation filling.