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Insulation Materials
Release time:
2019-10-18 15:37
Insulating materials, also known as dielectrics, refer to materials that are non-conductive or extremely conductive under the action of DC voltage, and their resistivity is generally greater than 10 10 Ω·m. The main function of insulating materials is to separate charged conductors of different potentials in electrical equipment so that current can flow along a certain path. They can also provide mechanical support and fixation, as well as arc extinguishing, heat dissipation, energy storage, moisture resistance, mildew resistance, or improve the potential distribution of the electric field and protect the conductor. Therefore, insulating materials are required to have the highest possible insulation resistance, heat resistance, moisture resistance, and a certain mechanical strength.
Insulating materials are materials that are non-conductive under the allowable voltage, but they are not absolutely non-conductive. Under a certain external electric field strength, they will also undergo processes such as conduction, polarization, loss, and breakdown, and they will also age after long-term use.
Its resistivity is very high, usually in the range of 10 10 to 10 22 Ω·m. For example, in a motor, the insulating material around the conductor isolates the turns and the grounded stator core to ensure the safe operation of the motor.