Multi-layer coated enamelled wire

Abstract

The invention belongs to the technical field of enamelled wires and particularly relates to a multi-layer coated enamelled wire. The multi-layer coated enamelled wire comprises a core wire as a conductor and a protective layer positioned out of the core wire, wherein the protective layer comprises inner insulating layers and an outer coating; the core wire is a poly-metal compound conductor which is composed of an aluminum core and a copper layer wrapped on the outer surface of the aluminum core; multiple insulating layers sequentially comprise a polyester layer, a polyamideimide layer, a polyurethane layer and a polyesterimide layer from inside to outside. The multi-layer coated enamelled wire provided by the invention is relatively high in corona resistance and long in anti-pulse service life, and the service life of a motor is prolonged, so that the demand on the conductive performance of an electrical apparatus element is satisfied; the metal wire core is good in flexibility, malleability and tensile property, the integral heat resistance, the insulativity, the mechanical property and the chemical resistance of an enamelled film are improved, and moreover, the multi-layer coated enamelled wire is good in straight welding performance; when the enamelled wire is welded, the film layer is not removed; the dielectric loss tangent at high frequency is relatively small, the application range is wide, and the multi-layer coated enamelled wire is suitable for being popularized and implemented.

Description

technical field [0001] The invention belongs to the technical field of enameled wires, in particular to a multi-layer coated enameled wire. Background technique [0002] At present, the existing enameled wire coated with a polyester layer has good adhesion, insulation and mechanical properties, but its resistance to high-frequency pulses is poor. In recent years, with the rapid development of frequency conversion speed regulation technology, frequency conversion motors have become more and more widely used, especially AC frequency conversion motors. Since AC variable frequency motors use electrical pulse waves, the waveforms have towering spikes with steep rise times and extremely high frequencies. Existing enameled wire coated with polyester layer is used in this kind of AC variable frequency motor, which has weak resistance to high frequency and instantaneous pulse peak voltage, and the enameled wire winding is prone to turn-to-turn breakdown, which shortens the service l...

AI Technical Summary

Problems solved by technology

Existing enameled wire coated with polyester layer is used in this kind of AC variable frequency motor, the ability to resist high frequency and instantaneous pulse peak voltage is weak, and the enameled wire winding is prone to turn-to-turn breakdown, which shortens the service life of the motor

Moreover, the wire cores of existing enameled wires are mostly made of copper materials, that is, the existing enameled wire cores only have a single layer of copper

The price of copper is higher than that of aluminum, which makes the cost of enameled wire relatively high; but aluminum is used as the core of enameled wire, and its electrical conductivity is poor, which cannot meet the electrical conductivity requirements of electrical components.

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