High heat aging resistant surge insulated enameled wire

2024-03-07 14:04:32

High heat aging resistant surge insulated enameled wire

The inverter surge insulated enameled wire has a high partial discharge starting voltage and excellent heat aging characteristics by thickening the insulating layer without affecting the high temperature insulating properties.

The copper or aluminum conductor is provided with at least one layer of enamel baking enamel around the outer periphery, and at least one layer of extruded coating resin is provided outside the enamel baking enamel layer, which is enamel baked and resin coated by extrusion. . The layer is provided. The thickness of the enamel baking paint layer is ≤60 μm, the thickness of the extrusion coating resin layer is ≤200 μm, and the minimum value of the extrusion tensile modulus at 25-250° C: 100 MPa for the coating resin layer, or other insulating layer formed by combining the enamel baking paint layer and the extrusion coating resin layer, which has a relative permittivity at 25° C of less than 3-.5, and at 250° C of less than 5.0, and the relative permittivity of the enamel baking paint layer at 25°C is less than 3-.5 and at 250°C is less than 5.0 The enamel layer is at 250°C. The inverter surge insulated wire, wherein the ratio between the relative dielectric constant (ε1') at ε and the relative dielectric constant (ε2') at 250°C extruded from the coated resin layer satisfies (ε2'/ε1')>1.

High quality enameled wires are mainly used in
coils of electrical equipment such as high-speed switching elements, inverter motors, and transformers. In addition, since the voltage applied to the inverter-related equipment is about twice the output voltage of the inverter, it is possible to minimize the inverter surge degradation of enameled wires, which are one of the materials constituting these electrical equipment.