Basically, electrical and electrical equipment are made of conductive materials, magnetic materials, insulating materials and unsaturated polyester glass mat sheet. In addition to insulating materials, the other is metal materials. Motor, electrical appliances in operation, inevitably subject to temperature, electricity, mechanical stress and vibration, harmful gases, chemicals, moisture, dust and radiation and other factors. These factors have a more pronounced effect on insulating materials than other materials. It can be said that the insulation material is more sensitive to these factors, easy to deteriorate deterioration, resulting in damage to electrical equipment. So the insulation material is to determine the motor, electrical operation reliability of the key material. With the continuation of running time, insulation materials must be aging, and its aging faster than other materials, so the choice of motor, electrical life of the key material is insulating material.
insulation transformer pressboard is a key factor in determining the technical and economic indicators of motor and electrical appliances. One of the important technical and economic indicators of the motor is the mass power ratio, that is, the kg / kw value. Reduce the ratio value, the motor is important. According to reports, from 1900 to 1967, 60 years, 1hp (0.75kW) motor quality from 40kg to 10kg, has been reduced to 6kg / kW level. An important reason for this change is the use of insulating materials with high heat resistance. Reduce the kg / kW value can save a lot of metal materials, reduce motor costs. Such as a A-class (105 ℃) motor with H-class (180 ℃) insulation, can reduce the volume of 30% to 50%, saving copper 20%, silicon steel sheet 30% to 50%, cast iron 25%. Of course, using the same model machine, with a higher temperature index insulation material, can improve the power or extend the life of the motor. From the electrical, electrical products, the cost of the situation, the cost of insulating materials in about half of these are that insulating materials in the electrical, electrical industry, the proportion occupied by the very large.

DMD insulation paper is one of the key factors to determine the technical and economic indicators of motor and electrical appliances. One of the important technical and economic indicators of the motor is the mass power ratio, that is, the kg / kw value. Reduce the ratio, the motor has important significance. It is reported that from 1900 to 1967, 1hp (0.75kW) motor quality from 40kg to 10kg, has now been reduced to 6kg / kW level. An important reason for this change is the use of insulating materials with high heat resistance. Reduce the kg / kW value can save a lot of bakelite electrical insulation board, reduce motor costs.
Such as a A-class (105 ℃) motor with H-class (180 ℃) insulation, can reduce the volume of 30% to 50%, saving copper 20%, silicon steel sheet 30% to 50%, cast iron 25%. Of course, using the same model machine, with a higher temperature index insulation material, can improve the power or extend the life of the motor. From the electrical, electrical products, the cost of the situation, the cost of insulating materials in about half of these are the insulating materials in the electrical, electrical industry, the status and role.

Development Trend of Insulation Materials

The development and development of NHN Insulation paper is one of the key factors affecting the development of electrical technology. From the future trend, the requirements of the development of high pressure, heat insulation, impact resistance, environmental insulation, composite insulation, corrosion resistance, water, oil, cryogenic, radiation and flame retardant materials, research and development of environmentally friendly energy-saving materials.
The focus is on the development of high-voltage generators for high-pressure epoxy mica glass cloth tape, such as FR5, phlogopite, etc .; small and medium-sized motor F, H-class insulation series, such as unsaturated polyester resin glass felt board; High-performance insulating oil; synthetic paper composite insulation; flame-retardant rubber and plastic materials and surface protection materials, and to actively promote the traditional use of sulfur hexafluoride gaseous medium; Replacement of insulation materials for electrical equipment.

The main indicators that affect the performance of insulating materials are as follows:

1, phenolic laminated sheet resistance and resistivity
The resistance is the reciprocal of the conductance, and the resistivity is the resistance per unit volume. The smaller the conductivity of the material, the greater the resistance, the reciprocal relationship between the two, for the insulation material, always want the resistivity as high as possible.
2, the relative dielectric constant and dielectric loss tangent
Insulation material uses two: electrical network components of the mutual insulation and capacitor media (energy storage). The former requires a relatively small relative dielectric constant, which requires a relatively large relative dielectric constant, and both require dielectric loss tangent, especially in high frequency and high voltage applications of insulating materials, in order to make dielectric loss is small, are required to use Dielectric loss tangent small insulation material.
3, breakdown voltage and electrical strength
In a strong electric field under the destruction of insulating materials, loss of insulation into a conductive state, known as breakdown. The breakdown voltage is called the breakdown voltage (dielectric strength). Electrical strength is the breakdown of the voltage between the voltage and the two electrodes subjected to the applied voltage under the specified conditions, that is, the breakdown voltage per unit thickness. For insulating materials, the general breakdown voltage, electrical strength of the value of the higher the better.
4, tensile strength
Is the maximum tensile stress that the specimen is subjected to in the tensile test. It is the most widely used and tested test of the mechanical properties of insulation paper.
5, resistance to burning
Refers to the ability of the insulating material to prevent continued combustion when it is in contact with the flame. With the increasing use of insulating materials, its flammability requirements are more important, people through various means to improve and improve the flame resistance of insulating materials. The higher the flame resistance, the better the safety.
6, resistant to arc
Under the specified test conditions, the insulating material is resistant to the arc acting along its surface. Test the use of high voltage AC current, by high pressure between the two electrodes generated by the arc, so that the surface of the insulating material to form the conductive layer of the time required to determine the arc resistance of insulating materials. The greater the time value, the better the arc resistance.
7, the degree of sealing
On the oil, water quality isolation is better.

What are the types of insulating materials?

insulation materials is used to isolate solids from different conductors. Generally require solid insulation material both support. Solid insulation materials due to high density, and therefore the breakdown strength is much higher, solid insulation materials, insulation resistance, dielectric constant and a wide range of changes.
Solid insulating materials can be divided into inorganic and organic two categories.
Inorganic solid NMN Insulating material: mainly powder mica and mica products, glass, glass fiber and its products, as well as porcelain, alumina film. They are resistant to high temperatures, are not aging, have considerable mechanical strength, some of which are materials such as low cost, occupying a certain position in the application.
The glass process is simpler than the ceramic and can be used to make it. Glass fiber can be made of silk, cloth, belt, with much higher than the organic fiber heat resistance, in the insulation structure to the development of high temperature plays an important role.
Organic solid insulation materials: natural in the 19th century, such as paper, cotton, silk, can be cured of vegetable oil. These materials are compliant, to meet the application process requirements, and easy to obtain.
Silicone resin combined with less alkaline glass cloth, greatly improved, the heat resistance grade. Polyethylene formaldehyde made of paint-based enameled wire to open up the broad prospects for enameled wire, instead of silk wire and yarn package line. Polyester film thickness of only a few tens of microns, with it instead of the original paper and cloth, so that motor, electrical technology and economic indicators greatly improved. Polyarylamide fiber paper and polyester film, polyimide film used to make the motor slot insulation heat rating were F and H level. The elastomeric material also has a similar development, such as heat-resistant silicone rubber, oil-resistant nitrile rubber, and subsequent fluororubber, ethylene propylene rubber and the like.

Insulation resistance of insulating materials

mica insulation sheets can prevent current from passing through the material. Its resistivity is very high, usually in the range of 10 ~ 10Ω · m. What is the flame resistance of insulating materials? Here we come together to understand the next:
The flame resistance of mica insulation tape refers to the ability of the insulating material to resist the continued combustion when it is combusted or burned away from the flame. With the increasing use of insulating materials, its flammability requirements are more important, people through various means to improve and improve the flame resistance of insulating materials. The higher the flame resistance, the better the safety.

Flexible composite materials is widly used for small motor

Flexible composite materials is widly used for small motor and electrical insulation slot liner, gasket and turn to turn and layer insulation, liner insulation, insulation transformer pressboard, and other electrical insulation with termperature requirement not exceeding 130, this material has a excellent performance in both electrical and mechanical properties.
Certification: ISO Quality certification; SGS System Certification; Electrical machinery industry by product quality supervision and inspection center material testing.