For insulating materials, it should have high toughness, excellent dielectric properties, high thermal conductivity, easy to insert, a certain hardness, resilience and appropriate heat resistance grade and other performance requirements. Different use environments have different requirements for insulating materials. For corrosive environmental conditions, the corresponding insulating materials must have certain corrosion resistance.

In the actual use process, we should try our best to maintain the original state of the insulating material, and there will be no wrinkles, layering, bubbles and other phenomena that affect the insulation performance. Good insulation materials can effectively improve the service life of the motor. On the contrary, insulation materials that do not meet the requirements will greatly reduce the life of the motor. Insulation paper is a general term for electrical insulation paper. Used as an insulating material for cables, coils and other electrical equipment. In addition to all have good insulation properties and mechanical strength, but also have their own characteristics.

Composition and properties of different insulating materials

● DMD insulation paper (Class B insulation). The product is made of a layer of polyester film coated with adhesive, one side of the polyester fiber non-woven composite, calendered from a composite insulation material products, referred to as DMD.

● NMN insulation paper (Class F insulation). It is a soft composite material composed of a middle layer of polyester film and Nomex paper on both sides. The heat resistance grade is F (155 ℃). It has good mechanical properties, such as tensile strength and edge tear resistance, and good electrical strength. Its smooth surface, when the production of low-voltage motors using automatic off-line machine can ensure trouble-free. Mainly used for low-voltage motor in the slot, slot cover and phase insulation, in addition can also be used as transformer or other electrical insulation layer.

NOMEX paper is also known as Nomex. It is a synthetic aromatic amide polymer insulation paper, which has high mechanical properties, flexibility and good electrical properties, and can maintain its characteristics at high temperatures. It is widely used in generators, transformers, electrical equipment, electromechanical and In household appliances.

The commonly known "DuPont paper" on the market is actually two kinds of materials produced by DuPont: one is high-density polyethylene material, named Tyvek, and the Chinese name is Tyvek; the other is meta-aramid fiber material, named Nomex, and the Chinese name is Nomex.

● NHN insulation paper (Class H insulation). It is a soft composite material composed of a polyimide film in the middle and Nomex paper on both sides. It has a heat resistance grade of H (180 ℃) and has good mechanical properties, such as tensile strength and edge tear resistance, as well as good electrical strength. Its smooth surface, when the production of low-voltage motor using automatic off-line machine to ensure trouble-free NHN is mainly used for high heat-resistant performance of the motor slot, slot cover and phase insulation, in addition can also be used as transformer or other electrical insulation layer.

● TFT composite material. Is a series of high-performance insulation paper composite products. tufQUIN110 and polyester film composite, the typical structure is a layer of thin tufQUIN insulation paper, double-sided composite polyester film, for high temperature insulation system. Typical for H-class motors or engines, for slot insulation and slot insulation, is a product with balanced electrical, object and thermal performance, and improves the reliability of equipment work through the improvement of insulation material performance.