How is electrical insulation paper made? ZTelec Group will tell you the answer. Electrical insulating papers like ...
How is electrical insulation paper made? ZTelec Group will tell you the answer. Electrical insulating papers like dmd/dm/dmdm/dmdp paper and ddp insulation paper are all the main insulating material of motor windings, which can be used for slot insulation, turn insulation, layer insulation and phase insulation of small and medium-sized motors. Take the commonly used DMD insulation paper as an example, the product is a kind of composite insulation material products made of a layer of polyester film coated with adhesive, one side is polyester fiber non-woven composite by calendering. DMD insulating paper has good mechanical strength, dielectric property and high heat resistance. Under normal operating conditions, insulation paper should not appear layering and bubbling problems.
The insulation material in the motor shall be matched with the heat resisting grade of the motor. Insulation materials are particularly vulnerable to accelerated aging and damage by high temperatures. The heat resistance of different insulating materials is different. The motors with different insulating materials have different ability to withstand high temperature. Therefore, the motor product will specify the most high temperature at which it works.
On the premise of ensuring the stable and reliable quality of motor products, improving the breakdown and heat resistance of insulation layer is one of the important measures to improve the insulation performance of motor. To improve the moisture absorption of insulation products, the key to heat resistance is to choose insulation materials with breakdown and heat resistance.
Main properties of electrical insulation materials for motors
The main function of insulating materials like G10/G11 high temperature epoxy resin fiberglass laminated sheet material is to separate the conductors of the different parts of the electrical equipment so that the current can flow in a predetermined direction. Transformer insulation material is the weak link in electrical equipment, many faults occur in the electrical insulation part, so insulation material should have good dielectric performance, high insulation resistance and compressive strength; Good heat resistance will not cause performance by long-term heat performance changes; Good moisture-proof, lightning-proof, mildew-proof and high mechanical strength, and easy to process all are advantages of ZTelec electrical insulation materials like FR4 fiberglass sheet.
Insulation performance of electrical insulation materials will gradually become worse, known as insulation aging in long-term use and under the effect of temperature, electrical, mechanical and other aspects. Temperature has a great influence on the service life and insulation aging of insulating materials. Therefore, in order to ensure the long-term safe operation of electrical equipment like oil immersed type filled transformer, the heat resistance grade and limit working temperature of insulating materials have been clearly stipulated. If the operating temperature of electrical equipment exceeds the limit operating temperature of the electrical insulating material used, the service life of the insulating material will be shortened. Generally more than 6℃, the service life of insulating materials will be shortened by half.