Application and matching of insulation materials and motor performance
Four characteristics of insulating materials
The characteristics of various insulating materials are also different. The main performance indexes of commonly used insulating materials are breakdown strength, heat resistance, insulation resistance and mechanical strength.
● Breakdown strength. When the insulating material is subjected to an electric field strength higher than a certain value, it will be damaged and lose its insulating properties. This phenomenon is called breakdown. The electric field strength when the insulating material is broken down is called the breakdown strength, and the unit is: kV/mm; this performance check is performed by means of withstand voltage.
● Heat resistance. When the temperature rises, the electrical resistance, breakdown strength, mechanical strength and the like of the insulating material are lowered. Therefore, it is required that the insulating material can work for a long period of time at a prescribed temperature and the insulation performance is ensured to be reliable. The heat resistance of different materials of insulating materials is different. The maximum working temperature of insulating materials with different heat resistance levels is different, and should be selected according to the actual working conditions of the motor.
●Insulation resistance. The resistance value exhibited by the insulating material is the insulation resistance. In general, the insulation resistance is generally several tens of megaohms or more. Insulation resistance varies greatly depending on temperature, thickness, and surface condition (moisture, dirt, etc.).
● Mechanical strength. According to the specific requirements of various insulating materials, the corresponding specified tensile strength, compression resistance, bending resistance, shear resistance, tear resistance, impact resistance and other strength indicators are collectively referred to as mechanical strength.
● Other characteristics indicators. Some insulating materials are presented in liquid form, such as various insulating varnishes, and their characteristics include viscosity, fixed content, acid value, drying time and gelation time. Some insulating material properties also refer to permeability, oil resistance, elongation, shrinkage, solvent resistance, arc resistance, and the like.
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