Enameled wire and motor comprising same

Abstract

Provided is an enameled wire. The enameled wire comprises a conductive member. In the radial direction of the enameled wire, an adhesion layer, a low-Dk layer, a corona-resistant layer, and a lubricating layer are sequentially arranged surrounding the conductive member, and the adhesion layer is adjacent to the conductive member. The enameled wire has a heat resistance level of more than 220°C, and also has advantages such as high insulation and high corona resistance; thus, the performance requirements of an 800-V asynchronous motor are met. Further provided is a motor comprising the enameled wire.

Description

Enameled wire and motor including the same

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 20, 2023, with application number 202323493006.0 and application name “A kind of enameled wire and a motor comprising the same”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of energy, and specifically provides an enameled wire and a motor comprising the same. Background Art

[0003] Currently, enameled wire used in new energy vehicles is typically designed for 400V / 600V motors. Compared to traditional 400V / 600V new energy vehicle motors, the rated voltage of 800V motors has increased significantly, and the peak power requirements of these upgraded motors have also increased. Therefore, the 800V high-power platform places stringent requirements on the insulation, heat resistance, and corona resistance of the motors and related subcomponents (such as enameled wire).

[0004] Summary of the Invention

[0005] In order to solve the above problems, the purpose of the present application is to provide an enameled wire, which includes a conductive part, wherein in the radial direction of the enameled wire, an adhesion layer, a low DK layer, a corona-resistant layer and a lubricating layer are arranged in sequence around the conductive part, and wherein the adhesion layer is adjacent to the conductive part.

[0006] Preferably, in the radial direction of the enameled wire, the adhesion layer, the low DK layer (low dielectric constant layer), the corona-resistant layer and the lubricating layer have a total thickness T, wherein the thickness T1 of the adhesion layer is 0.04T to 0.08T, the thickness T2 of the low DK layer is 0.1T to 0.4T, the thickness T3 of the corona-resistant layer is 0.6T to 0.9T, and the thickness T4 of the lubricating layer is 0.02T to 0.07T.

[0007] Preferably, the conductive member is made of copper.

[0008] Preferably, the low DK layer has a dielectric constant of less than 2.5.

[0009] Preferably, the corona-resistant layer comprises inorganic particles, and the average particle size of the inorganic particles is 10 nm to 20 nm.

[0010] Preferably, the lubricating layer has a friction coefficient of less than 0.06.

[0011] Preferably, the low DK layer comprises modified polyimide (PI).

[0012] Preferably, the corona-resistant layer comprises modified polyimide (PI).

[0013] Preferably, the adhesive layer comprises modified polyimide (PI).

[0014] Preferably, the lubricating layer comprises polyamideimide (PAI).

[0015] Preferably, the polyimide contained in the adhesion layer, the low DK layer and the corona resistant layer is obtained through different modification methods.

[0016] Preferably, the enameled wire has a diameter of 0.830 mm to 0.840 mm, and the conductive member has a diameter of 0.691 mm to 0.709 mm.

[0017] Preferably, the adhesion layer, low DK layer, corona resistant layer and lubricating layer are continuously and synchronously formed on the same equipment.

[0018] Preferably, the ratio of the maximum thickness to the minimum thickness of the adhesion layer in the circumferential direction does not exceed 1.1, preferably does not exceed 1.05, the ratio of the maximum thickness to the minimum thickness of the low DK layer in the circumferential direction does not exceed 1.1, preferably does not exceed 1.05, the ratio of the maximum thickness to the minimum thickness of the corona-resistant layer in the circumferential direction does not exceed 1.1, preferably does not exceed 1.05, and the ratio of the maximum thickness to the minimum thickness of the lubricating layer in the circumferential direction does not exceed 1.1, preferably does not exceed 1.05.

[0019] Preferably, to ensure that the eccentricity meets the design requirements, the adhesion layer, the low DK layer, the corona-resistant layer and the lubricating layer are coated by a vertical coating machine.

[0020] The present application provides an enameled wire having a heat resistance rating exceeding 220°C, and at the same time having the advantages of high insulation, high corona resistance, etc., and thus meeting the performance requirements of 800V asynchronous motors.

[0021] The present application also provides a motor, which includes the enameled wire according to the present application.

[0022] BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To make the above-mentioned objects, features and advantages of the present application easier to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, many specific details are set forth to fully understand the present application, but the present application can also be implemented in other ways different from those described herein, and therefore the present application is not limited to the specific embodiments disclosed below.

[0024] FIG1 schematically shows a cross-sectional view of an enameled wire according to the present application.

[0025] LIST OF REFERENCE NUMERALS 1 Electrically conductive element 2 Adhesion layer 3 Low-DK layer 4 Corona-resistant layer 5 Lubricating layer DETAILED DESCRIPTION

[0026] In order to make the purpose, features, and advantages of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] The technical solution of the present application is further described below with reference to the accompanying drawings and through specific implementation methods. In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only used to facilitate the description of the present application and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0028] The embodiments of the present application disclose an enameled wire.

[0029] Referring to Figure 1, an embodiment of the present application provides a high-resistance enameled wire. The enameled wire includes a conductive part 1, wherein an adhesion layer 2, a low DK layer 3, a corona-resistant layer 4, and a lubricating layer 5 are sequentially arranged around the conductive part in the radial direction of the enameled wire, and wherein the adhesion layer is adjacent to the conductive part, and the adhesion layer 2, the low DK layer 3, the corona-resistant layer 4, and the lubricating layer 5 are arranged sequentially from the inside to the outside.

[0030] In the radial direction of the enameled wire, the adhesion layer, the low DK layer, the corona resistant layer and the lubricating layer have a total thickness T, wherein the thickness T1 of the adhesion layer is 0.05T, the thickness T2 of the low DK layer is 0.25T, the thickness T3 of the corona resistant layer is 0.65T, and the thickness T4 of the lubricating layer is 0.05T.

[0031] The adhesion layer in this embodiment has high adhesion to the conductive member, especially copper. Therefore, after the high adhesion layer is coated on the conductive member, better overall adhesion and stability can be provided for subsequent coating.

[0032] Specifically, the conductive member is made of copper.

[0033] Specifically, the low DK layer has a dielectric constant of less than 2.5, which greatly improves the local performance of the enameled wire.

[0034] Specifically, the corona-resistant layer comprises inorganic particles, and the average particle size of the inorganic particles is 10nm to 20nm. Preferably, based on the gross weight of the corona-resistant layer, the content of the silicon dioxide particles is 1 wt % to 10 wt %. Thus, an organic-inorganic network structure can be constructed in the corona-resistant layer, thereby forming a reverse electric field inside the film, delaying corona aging, and ensuring the corona resistance of the enameled wire. The inorganic particles, for example, include at least one of aluminum oxide, boehmite, magnesium hydroxide, aluminum hydroxide, garnet and silicon dioxide. Preferably, the inorganic particles are silicon dioxide.

[0035] Preferably, the lubricating layer has a coefficient of friction of less than 0.06. Specifically, the lubricating layer contains an excellent lubricating component, such as paraffin wax, which forms a smooth outer layer on the surface of the enameled round wire after molding, thereby reducing wire loss during subsequent stator molding processes such as winding and inserting, and improving the processability of the enameled round wire.

[0036] Specifically, the ratio of the maximum thickness to the minimum thickness of the adhesion layer in the circumferential direction does not exceed 1.1, the ratio of the maximum thickness to the minimum thickness of the low DK layer in the circumferential direction does not exceed 1.1, the ratio of the maximum thickness to the minimum thickness of the corona-resistant layer in the circumferential direction does not exceed 1.1, and the ratio of the maximum thickness to the minimum thickness of the lubricating layer in the circumferential direction does not exceed 1.1.

[0037] As a result, the adhesion layer, low DK layer, corona-resistant layer and lubricating layer sequentially arranged on the conductive part have extremely high dimensional accuracy, thereby ensuring the reliability and stability of the enameled wire performance.

[0038] Although some exemplary embodiments of the present application have been illustrated and described, the present application is not limited to the disclosed embodiments. On the contrary, those skilled in the art will recognize that certain modifications and changes may be made to the described embodiments without departing from the spirit and scope of the present application as described in the appended claims, and such modifications and changes also fall within the scope of protection of the present application.

Claims

1. An enameled wire, characterized in that: The enameled wire comprises a conductive part, wherein an adhesive layer, a low DK layer, a corona-resistant layer and a lubricating layer are sequentially arranged around the conductive part in a radial direction of the enameled wire, and wherein the adhesive layer is adjacent to the conductive part.

2. The enameled wire according to claim 1, characterized in that: In the radial direction of the enameled wire, the adhesion layer, the low DK layer, the corona resistant layer and the lubricating layer have a total thickness T, wherein the thickness T1 of the adhesion layer is 0.04T to 0.08T, the thickness T2 of the low DK layer is 0.1T to 0.4T, the thickness T3 of the corona resistant layer is 0.6T to 0.9T, and the thickness T4 of the lubricating layer is 0.02T to 0.07T.

3. The enameled wire according to claim 1, characterized in that: The conductive member is made of copper.

4. The enameled wire according to claim 1, characterized in that: The low DK layer has a dielectric constant of 2.5 or less.

5. The enameled wire according to claim 1, characterized in that: The corona-resistant layer comprises inorganic particles, and the average particle size of the inorganic particles is 10 nm to 20 nm.

6. The enameled wire according to claim 1, characterized in that: The lubricating layer has a friction coefficient of 0.06 or less.

7. The enameled wire according to claim 1, characterized in that: The low DK layer comprises a modified polyimide, and / or the corona resistant layer comprises a modified polyimide.

8. The enameled wire according to claim 1, characterized in that: The enameled wire has a diameter of 0.830 mm to 0.840 mm, and the conductive member has a diameter of 0.691 mm to 0.709 mm.

9. The enameled wire according to claim 1, characterized in that: The ratio of the maximum thickness to the minimum thickness of the adhesion layer in the circumferential direction does not exceed 1.1, the ratio of the maximum thickness to the minimum thickness of the low DK layer in the circumferential direction does not exceed 1.1, the ratio of the maximum thickness to the minimum thickness of the corona resistant layer in the circumferential direction does not exceed 1.1, and the ratio of the maximum thickness to the minimum thickness of the lubricating layer in the circumferential direction does not exceed 1.

1.

10. A motor, characterized in that: The electric motor comprises the enameled wire according to any one of claims 1 to 9.

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