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.