Layered low-skin-effect enameled round wire

Abstract

The invention relates to a layered low-skin-effect enameled round wire which comprises a center wire, an external insulating layer arranged outside the center wire, a plurality of conductor layers and a plurality of middle insulating layers, the conductor layers and the middle insulating layers are arranged between the center wire and the outermost insulating layer, and the middle insulating layers and the conductor layers are sequentially arranged at intervals. The cable is characterized in that the central lead is a single cylindrical lead manufactured by a drawing process, and the conductor layer is a single cylindrical lead manufactured by a drawing process. Compared with the prior art, the central wire and the conductor layer are single wires manufactured by a stretching process, stress is not generated, and the insulating layer is not scratched, so that the thickness of the insulating layer can be reduced, the volume is reduced, the volume ratio of the insulating layer is reduced, the electrical performance can be improved, and the heating value is reduced.

Description

Technical Field

[0001] The present invention relates to an enameled round wire for a drive motor, and more particularly to a layered enameled round wire with low skin effect. Background Art

[0002] The core power device of an electric vehicle is an electric motor. For an in-vehicle electric drive motor, it is necessary to reduce the skin effect to reduce the energy consumption of the motor.

[0003] In this regard, in the current prior art, a flat wire motor is usually adopted. Compared with a traditional round wire motor, a flat wire motor has the advantage of strong skin effect resistance. However, a flat wire motor also has some defects, such as complex processing technology and high cost.

[0004] Although there are also some existing technologies for reducing the skin effect of round wires, for example, Chinese Patent CN208488999U discloses an enameled profiled wire stranded and segmented conductor, and Chinese Patent CN102682903A discloses a high-frequency cable, but they are all used for cables. There are significant differences between cables and motors. For example, the size of a cable is often large and it is difficult to install in a motor, and there are significant differences in their electrical properties. Therefore, it is difficult to apply them to an electric drive motor. Summary of the Invention

[0005] The purpose of the present invention is to provide a layered enameled round wire with low skin effect. The central conductor and the conductor layer are both single wires made by an oil drawing process, which does not generate stress and will not scratch the insulating layer. Thus, the thickness of the insulating layer can be reduced, the volume can be further reduced, and the volume ratio of the insulating layer is also reduced. It can also improve the electrical performance and reduce the heat generation.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A layered enameled round wire with low skin effect, comprising:

[0008] A central conductor and an outer insulating layer provided outside the central conductor,

[0009] A plurality of conductor layers and a plurality of intermediate insulating layers provided between the central conductor and the outermost insulating layer, and each intermediate insulating layer and conductor layer are arranged at intervals in sequence;

[0010] The central conductor is a single cylindrical wire made by a drawing process, and the conductor layer is a single cylindrical wire made by a drawing process.

[0011] The central conductor and all the conductor layers are concentrically arranged.

[0012] The outer insulating layer and the intermediate insulating layers are both paint layers.

[0013] The paint layer is a single paint layer, and the material is: polyamideimide.

[0014] The paint layer is a composite paint layer, which is composed of one or more of polyester, anti-frequency conversion modified polyester and polyamideimide.

[0015] The surfaces of the central conductor and the conductor layer are smooth.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Both the central conductor and the conductor layer are single conductors made by a stretching process, without generating stress and not scratching the insulating layer, so that the thickness of the insulating layer can be reduced, the volume can be further reduced, and the volume ratio of the insulating layer is reduced, and the electrical performance can also be improved and the heat generation can be reduced.

[0018] 2. The electric field of the conductor is more evenly distributed at high frequencies, which can effectively reduce the skin effect of the enameled wire at high frequencies, improve the utilization rate of the enameled wire at high frequencies, further reduce the heat generation, and improve the efficiency.

[0019] 3. The surfaces of the central conductor and the conductor layer are smooth, which can further protect the insulating layer from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a schematic diagram of a single paint layer;

[0022] Figure 3 is a schematic diagram of a composite paint layer;

[0023] Wherein: 1 is an outer insulating layer, 10 is a central conductor, 2, 4, 6, 8 are conductor layers, and 3, 5, 7, 9 are intermediate insulating layers. DETAILED DESCRIPTION OF THE INVENTION

[0024] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and gives the detailed implementation manner and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0025] A layered enameled round wire with low skin effect, as Figure 1 shown, includes:

[0026] a central conductor 10 and an outer insulating layer 1 provided outside the central conductor 10,

[0027] a plurality of conductor layers and a plurality of intermediate insulating layers provided between the central conductor 10 and the outermost insulating layer 1, and each intermediate insulating layer and conductor layer are arranged at intervals in turn;

[0028] It is characterized in that the central conductor 10 is a single cylindrical conductor made by a stretching process, and the conductor layer is a single cylindrical conductor made by a stretching process.

[0029] Both the central conductor 10 and the conductor layer are single conductors made by a stretching process, which do not generate stress and will not scratch the insulating layer. Therefore, the thickness of the insulating layer can be reduced, the volume can be further reduced, and the volume ratio of the insulating layer is decreased. Also, the electrical performance can be improved and the heat generation can be reduced.

[0030] In the existing field of cables, the soft copper wires comply with the standards of the GB / T 3953 series. Since there are requirements for tensile properties, they are all formed by stranding multiple copper wires. This stranding method can improve their tensile properties. However, due to the relatively large stress and the non-smooth surface, they will damage the insulating layer. In order not to affect the normal use of the cable, the thickness of the insulating layer is relatively thick, and the overall volume, that is, the radial cross-sectional area, is large, resulting in difficulty in application on electric drive motors. And those skilled in the art are restricted by relevant national standards and will not change the forming process under such restrictions.

[0031] Generally, the central conductor 10 and all conductor layers are concentrically arranged. In this way, balance can be achieved, and all insulating layers can also be concentrically arranged.

[0032] In most embodiments, both the outer insulating layer and the intermediate insulating layer are paint layers. In some of these embodiments, as Figure 2 shown, it can be a single paint layer with the material of polyamideimide. In some other embodiments, as Figure 3 shown, it can also be a composite paint layer with the material including one or more of polyester, corona resistant polyester, and polyamideimide. The material of the intermediate insulating layer can be the same as or different from that of the outer paint layer 1. The paint layer is evenly coated outside the copper layer, and the paint layer plays the roles of insulation, corona resistance, and heat transfer.

[0033] Generally, the surfaces of the central conductor and the conductor layer are smooth, which can further protect the insulating layer from being damaged.

[0034] In a certain embodiment, as Figure 1 shown, both the conductor layer and the intermediate insulating layer are provided with 4. Of course, in other embodiments, other quantity settings can also be used.

[0035] In some embodiments, the thicknesses of all the conductor layers are equal, so that the consistency is better. Of course, in other embodiments, the thicknesses of the layers are designed according to specific working conditions. Similarly, the thickness of the conductor layer and the radius of the central wire may be equal or may be determined to be unequal according to the actual working conditions.

[0036] In some embodiments, the thicknesses of all the intermediate insulating layers are equal. Thus, the consistency is better. Of course, in other embodiments, the thicknesses of the layers are designed according to specific working conditions.

[0037] In almost all embodiments, the materials of the central wire 10 and the conductor layer are both copper.

[0038] For the specific processing method of the enameled round wire provided in this application, one method may be to first pre-process the central wire 10 and conductor layers with different diameters through a stretching process, and then, after assembling in a mold, set the paint layer by filling.

[0039] In addition, in some other processing methods, it is also possible to prefabricate both the paint layer and the copper layer (including the central wire 10 and the conductor layer) and assemble them through a thermal difference assembly process.

Claims

1. A layered low skin effect enameled round wire, comprising: A central conductor and an outer insulating layer provided outside the central conductor, a plurality of conductor layers and a plurality of intermediate insulating layers provided between the central conductor and the outermost insulating layer, and the intermediate insulating layers and the conductor layers are arranged at intervals in sequence; It is characterized in that the central conductor is a single cylindrical wire made by a stretching process, and the conductor layer is a single cylindrical wire made by a stretching process.

2. The layered low skin effect enameled round wire according to claim 1, wherein The central conductor and all the conductor layers are concentrically arranged.

3. The layered low skin effect enameled round wire according to claim 1, wherein Both the outer insulating layer and the intermediate insulating layer are paint layers.

4. The layered low skin effect enameled round wire according to claim 3, wherein The paint layer is a single paint layer, and the material is polyamideimide.

5. The layered low skin effect enameled round wire according to claim 3, wherein The paint layer is a composite paint layer, which is composed of one or more of polyester, anti-frequency conversion modified polyester and polyamideimide.

6. The layered low skin effect enameled round wire according to claim 1, wherein The surfaces of the central conductor and the conductor layer are smooth.

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