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...

Examples

Embodiment 1

[0021] see figure 1 , among the figures, the multi-layer coated enameled wire of the present invention includes a multi-metal composite conductor core, an outer covering insulating layer and an outer coating, wherein the multi-metal composite conductor wire consists of an aluminum core 1 and a copper layer 2 coated on its outer surface The coating layer is composed of polyester layer 3, polyamideimide layer 4, polyurethane layer 5 and polyesterimide layer 6 from the inside to the outside. The outer coating layer is made of hot-melt self-adhesive paint layer 7. Heat to form the enameled wire. The ratio of the radius of the aluminum core to the thickness of the copper layer is 1:0.1, and the thickness ratio of the polyester layer, polyamideimide layer, polyurethane layer and polyesterimide layer is 1:0.9:0.9:0.3.

Embodiment 2

[0023] Present embodiment figure is not drawn. This embodiment is similar in structure to Embodiment 1, and the structurally identical parts will not be repeated here. The difference is that the ratio of the radius of the aluminum core to the thickness of the copper layer in this embodiment is 1:0.2, and the polyester layer, polyamide The thickness ratio of the imide layer, polyurethane layer and polyesterimide layer is 1:1:1:0.5.

Embodiment 3

[0025] Present embodiment figure is not drawn. This embodiment is similar in structure to Embodiment 1, and the structurally identical parts will not be repeated here. The difference is that the ratio of the radius of the aluminum core to the thickness of the copper layer in this embodiment is 1:0.4, and the polyester layer, polyamide The thickness ratio of the imide layer, polyurethane layer and polyesterimide layer is 1:1:1.1:0.5.

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...

Examples

Embodiment 1

[0021] see figure 1 , among the figures, the multi-layer coated enameled wire of the present invention includes a multi-metal composite conductor core, an outer covering insulating layer and an outer coating, wherein the multi-metal composite conductor wire consists of an aluminum core 1 and a copper layer 2 coated on its outer surface The coating layer is composed of polyester layer 3, polyamideimide layer 4, polyurethane layer 5 and polyesterimide layer 6 from the inside to the outside. The outer coating layer is made of hot-melt self-adhesive paint layer 7. Heat to form the enameled wire. The ratio of the radius of the aluminum core to the thickness of the copper layer is 1:0.1, and the thickness ratio of the polyester layer, polyamideimide layer, polyurethane layer and polyesterimide layer is 1:0.9:0.9:0.3.

Embodiment 2

[0023] Present embodiment figure is not drawn. This embodiment is similar in structure to Embodiment 1, and the structurally identical parts will not be repeated here. The difference is that the ratio of the radius of the aluminum core to the thickness of the copper layer in this embodiment is 1:0.2, and the polyester layer, polyamide The thickness ratio of the imide layer, polyurethane layer and polyesterimide layer is 1:1:1:0.5.

Embodiment 3

[0025] Present embodiment figure is not drawn. This embodiment is similar in structure to Embodiment 1, and the structurally identical parts will not be repeated here. The difference is that the ratio of the radius of the aluminum core to the thickness of the copper layer in this embodiment is 1:0.4, and the polyester layer, polyamide The thickness ratio of the imide layer, polyurethane layer and polyesterimide layer is 1:1:1.1:0.5.

Images