Inverter surge-resistant insulated wire and method for producing same

Abstract

An inverter surge-resistant insulated wire wherein: at least one baked enamel layer and at least one extrusion coated resin layer, which is arranged on the outer side of the baked enamel layer, are provided around a conductor that has a rectangular cross-sectional shape; an adhesive layer having a thickness of 2-20 μm is provided between the baked enamel layer(s) and the extrusion coated resin layer(s); all of the extrusion coated resin layer(s) on the adhesive layer are formed of a same resin; the baked enamel layer(s) and the extrusion coated resin layer(s) in a cross-section of the inverter surge-resistant insulated wire have a rectangular cross-sectional shape; in the rectangular cross-sectional shape surrounding the conductor in the cross section and formed by the baked enamel layer(s) and the extrusion coated resin layer(s), both sides of at least one pair of sides among two pairs of sides that respectively face each other vertically or horizontally with respect to the conductor have a total thickness of the baked enamel layer(s) and the extrusion coated resin layer(s) of 80 μm or more, a thickness of the baked enamel layer(s) of 60 μm or less, and a thickness of the extrusion coated resin layer(s) of 200 μm or less; and the resin of the extrusion coated resin layer(s) has a melting point of from 300°C to 370°C (inclusive). A method for producing an inverter surge-resistant insulated wire, wherein an adhesive layer is formed around a baked enamel layer and a thermoplastic resin for forming an extrusion coated resin layer, said thermoplastic resin being in a molten state at a temperature that is higher than the glass transition temperature of the resin used for the adhesive layer, is extruded onto and brought into contact with the adhesive layer.

Description

technical field [0001] The invention relates to an anti-frequency converter surge insulated wire and a manufacturing method thereof. Background technique [0002] Frequency converters (inverters) are installed on many electrical equipment as effective variable speed control devices. Inverters perform switching at several kHz to tens of kHz, and surge voltages are generated in response to these pulses. Inverter surge (inverter surge) is a phenomenon in which reflection occurs at a discontinuous point of impedance within its transmission system, such as the beginning or end of the connected wiring, and as a result, a maximum output voltage of the inverter is applied. 2 times the voltage. In particular, the output pulses generated by high-speed conversion elements such as IGBTs have a high voltage steepness, so even if the connecting cable is shortened, the surge voltage is high, and the voltage attenuation caused by the connecting cable is also small. The output voltage is ...

AI Technical Summary

Problems solved by technology

[0021] However, in the method of adding these fine powders, the method of adding the fine powders is complicated and dispersion is difficult, so the method of adding these fine powders dispersed in a solvent to an insulating paint is often used

[0022] These self-lubricating components show improvement in self-lubricating performance (coefficient of friction) due to the lubricating component, but compared with the decrease in electrical insulation maintenance properties before and after processing, there is no improvement in properties such as reciprocating wear, and electrical insulation cannot be maintained.

In addition, various self-lubricating components such as polyethylene and polytetrafluoroethylene are separated in the insulating paint due to the difference in specific gravity with the insulating paint, and the method of using these paints has problems in practice.

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