A ceramic aluminum wire winding

Abstract

A ceramic aluminum wire winding comprises a prefabricated aluminum winding, the prefabricated aluminum winding comprises an insulating cylinder, a toothed insulating pad and an aluminum wire, the aluminum wire is wound on the insulating cylinder in several layers, toothed insulating pads are provided between each layer of aluminum wire and between the aluminum wire and the insulating cylinder so that interlayer gaps are formed between each layer of aluminum wire and between the aluminum wire and the insulating cylinder, the turns in each layer of aluminum wire are respectively stuck in the intertooth grooves of the toothed insulating pad so that interturn gaps are formed between the turns in each layer of aluminum wire; the prefabricated aluminum winding is subjected to micro-arc oxidation / thermal electrochemical oxidation treatment to form a ceramic aluminum wire winding. The ceramic aluminum wire winding of the present invention first winds a bare aluminum wire on the insulating cylinder, and then performs an oxidation treatment on the prefabricated aluminum winding, so as to form a complete ceramic aluminum wire winding at one time, fundamentally avoiding the problem of slag falling due to bending of the wire when making a winding with a ceramic aluminum wire.

Description

Technical Field

[0001] The invention relates to a transformer winding, in particular to a winding prepared with a ceramic aluminum conductor. Background Art

[0002] An aluminum conductor with a ceramic film layer is a new type of insulated conductor, but this type of ceramic aluminum conductor is very intolerant to large curvature bending (CN2022107568886). Using this type of ceramic aluminum conductor to generate windings using conventional winding methods will cause the ceramic film layer on the surface of the ceramic aluminum conductor to fall off due to large bending, causing the conductor to be scrapped, which limits the application of this new type of conductor in windings. Summary of the invention

[0003] The object of the present invention is to provide a ceramic aluminum wire winding prepared without bending the ceramic aluminum wire, so as to overcome the defects of the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows:

[0005] A ceramic aluminum wire winding comprises a prefabricated aluminum winding, which comprises an insulating cylinder, a toothed insulating pad and an aluminum wire. The aluminum wire is wound on the insulating cylinder in several layers. Toothed insulating pads are provided between each layer of the aluminum wire and between the aluminum wire and the insulating cylinder to form interlayer gaps between each layer of the aluminum wire and between the aluminum wire and the insulating cylinder. Turns in each layer of the aluminum wire are respectively stuck in intertooth grooves of the toothed insulating pad to form interturn gaps between turns in each layer of the aluminum wire. The prefabricated aluminum winding is subjected to micro-arc oxidation / thermoelectrochemical oxidation treatment to form a ceramic aluminum wire winding.

[0006] Furthermore, the toothed insulating gasket strip is a toothed insulating gasket strip formed by micro-arc oxidation / thermal electrochemical oxidation treatment of a toothed aluminum strip or a toothed aluminum alloy strip.

[0007] Furthermore, the tooth-shaped insulating gasket is a tooth-shaped organic insulating gasket, and the inner edge of the inter-tooth groove is embedded with a U-shaped aluminum gasket or a U-shaped aluminum alloy gasket treated by micro-arc oxidation / thermal electrochemical oxidation.

[0008] Furthermore, the aluminum conductor is a flat bare aluminum wire, and the shape of the inter-tooth groove is a rectangle.

[0009] Furthermore, the tooth-shaped insulating gaskets in the gaps between the layers are distributed at equal intervals.

[0010] Furthermore, the tooth-shaped insulating gaskets in the gaps between adjacent layers are distributed in a staggered manner.

[0011] Furthermore, the inter-tooth grooves on the tooth-shaped insulating gasket strip are distributed at equal intervals.

[0012] Compared with the prior art, the beneficial technical effects of the present invention are:

[0013] The ceramic aluminum wire winding of the present invention first winds a bare aluminum wire on an insulating cylinder, and then performs micro-arc oxidation / thermal electrochemical oxidation treatment on the prefabricated aluminum winding, so as to form a complete ceramic aluminum wire winding at one time, fundamentally avoiding the problem of slag shedding (surface ceramic film shedding phenomenon) caused by bending the ceramic aluminum wire when making the winding; since the instantaneous high-temperature discharge of the surface of the aluminum wire will destroy the organic insulating material when the aluminum wire is subjected to micro-arc oxidation / thermal electrochemical oxidation treatment, the present invention creatively separates the aluminum wire from the organic insulating material (insulating pad and / or insulating cylinder) with an aluminum gasket or gasket subjected to micro-arc oxidation or thermal electrochemical oxidation treatment, thereby avoiding the influence of the prefabricated aluminum winding on the organic insulating material when the oxidation treatment is performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a top view of the ceramic aluminum wire winding in Example 1 of the present invention;

[0015] Figure 2 yes Figure 1 Schematic diagram of the relative positions of the aluminum conductor, toothed insulating strip and insulating tube on the cross section at point A;

[0016] Figure 3 yes Figure 1 Schematic diagram of the relative positions of the aluminum conductor, toothed insulating strip and insulating tube on the cross section at B in the middle;

[0017] Figure 4 is a schematic structural diagram of the toothed insulating gasket in Embodiment 1 of the present invention;

[0018] Figure 5 is a schematic structural diagram of the toothed organic insulating gasket in Example 2 of the present invention;

[0019] Figure 6 It is a schematic diagram of the structure of the U-shaped gasket in Example 2 of the present invention, wherein a is the front view and b is the top view. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1:

[0022] like Figure 1-4As shown, a ceramic aluminum wire winding includes a prefabricated aluminum winding, the prefabricated aluminum winding includes an insulating cylinder 1, a toothed insulating gasket 2 and an aluminum wire 3, and the inter-tooth grooves 201 on the toothed insulating gasket 2 are evenly spaced. The aluminum wire 3 is wound on the insulating cylinder 1 in 5 layers, and there are toothed insulating gaskets 2 between each layer of aluminum wire and between the aluminum wire and the insulating cylinder, so that inter-layer gaps are formed between each layer of aluminum wire and between the aluminum wire and the insulating cylinder. The turns in each layer of aluminum wire are respectively stuck in the inter-tooth grooves 201 of the toothed insulating gasket 2, so that inter-turn gaps are formed between the turns in each layer of aluminum wire. The toothed insulating gaskets 2 in the gaps between each layer are evenly spaced, and the toothed insulating gaskets 2 in the gaps between adjacent layers are staggered.

[0023] The aluminum conductor 3 used in this embodiment is a flat bare aluminum wire, and the corresponding inter-tooth groove 201 is in a rectangular shape. If a round aluminum wire is used, the inter-tooth groove 201 is in a semicircular shape.

[0024] The prefabricated aluminum winding is treated with micro-arc oxidation / thermo-electrochemical oxidation to form a ceramic aluminum wire winding. This micro-arc oxidation / thermo-electrochemical oxidation treatment method is an existing conventional technology. For details, please refer to patent CN2022104775920. The prefabricated aluminum winding is immersed in a stainless steel barrel containing electrolyte. The wire ends on the prefabricated aluminum winding are connected to a power supply. The stainless steel barrel serves as a cathode. After connecting the micro-arc oxidation / thermo-electrochemical oxidation power supply, the aluminum wire on the prefabricated aluminum winding is oxidized into a ceramic aluminum wire. This method can make the ceramic aluminum wire winding fully formed at one time, fundamentally avoiding the problem of slag falling (the surface ceramic film layer falling off) due to bending the wire when making windings with ceramic aluminum wires.

[0025] In this embodiment, the toothed insulating pad 2 is formed by a toothed aluminum strip or a toothed aluminum alloy strip after micro-arc oxidation / thermal electrochemical oxidation treatment. Commonly used organic insulating materials for making windings include epoxy resin, phenolic resin, glass cloth, glass fiber, impregnated paper, etc. These organic insulating materials have limited high temperature resistance and can usually only withstand high temperatures of several hundred degrees Celsius. Since the instantaneous high temperature discharge (the instantaneous high temperature can reach 5000-8000 degrees Celsius) of the surface of the aluminum conductor during micro-arc oxidation / thermal electrochemical oxidation treatment will destroy the organic insulating material, the aluminum conductor 3 is separated from the insulating tube 1 by an aluminum toothed pad that has been subjected to micro-arc oxidation or thermal electrochemical oxidation treatment, thereby avoiding the ablation of the insulating tube 1 by the prefabricated aluminum winding during the oxidation treatment.

[0026] Example 2

[0027] like Figure 5 , 6 As shown, the difference between this embodiment and embodiment 1 is that the toothed insulating gasket 2 is a toothed organic insulating gasket, and the inner edge of its inter-tooth groove 201 is embedded with a U-shaped gasket 202 that has been treated with micro-arc oxidation / thermal electrochemical oxidation, and the U-shaped gasket 202 is an aluminum gasket or an aluminum alloy gasket that has been treated with micro-arc oxidation / thermal electrochemical oxidation.

[0028] Example 3

[0029] This embodiment is similar to Embodiment 1, except that after the prefabricated aluminum winding is subjected to micro-arc oxidation / thermal electrochemical oxidation treatment to form a ceramic aluminum wire winding, an organic insulating material (such as epoxy resin, polyimide, etc.) is further coated, and the interlayer gaps and interturn gaps serve as heat dissipation channels.

Claims

1. A ceramic aluminum wire winding, characterized in that: The invention comprises a prefabricated aluminum winding, which comprises an insulating cylinder, a toothed insulating pad and an aluminum conductor. The aluminum conductor is wound on the insulating cylinder in several layers. A toothed insulating pad is provided between each layer of the aluminum conductor and between the aluminum conductor and the insulating cylinder so that interlayer gaps are formed between each layer of the aluminum conductor and between the aluminum conductor and the insulating cylinder. The turns of the aluminum conductor in each layer are respectively stuck in the intertooth grooves of the toothed insulating pad so that interturn gaps are formed between the turns of the aluminum conductor in each layer. The prefabricated aluminum winding is subjected to micro-arc oxidation / thermal electrochemical oxidation treatment to form a ceramic aluminum conductor winding. The toothed insulating gasket strip is a toothed aluminum strip, a toothed aluminum alloy strip or a toothed organic insulating gasket strip; The toothed aluminum strip or toothed aluminum alloy strip is subjected to micro-arc oxidation / thermal electrochemical oxidation treatment to form a toothed insulating pad strip; The inner edge of the inter-tooth groove of the tooth-shaped organic insulating gasket is embedded with a U-shaped aluminum gasket or a U-shaped aluminum alloy gasket treated by micro-arc oxidation / thermal electrochemical oxidation.

2. A ceramic aluminum wire winding according to claim 1, characterized in that: The aluminum conductor is a flat bare aluminum wire, and the inter-tooth groove is in a rectangular shape.

3. The ceramic aluminum wire winding according to claim 1, characterized in that: The tooth-shaped insulating gaskets in the gaps between the layers are distributed at equal intervals.

4. A ceramic aluminum wire winding according to claim 3, characterized in that: The tooth-shaped insulating gaskets in the gaps between adjacent layers are distributed alternately.

5. The ceramic aluminum wire winding according to claim 1, characterized in that: The inter-tooth grooves on the tooth-shaped insulating gasket are distributed at equal intervals.

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