High-reliability high-voltage explosion-proof motor winding anti-buckling structure

Abstract

The application relates to the technical field, in particular to a high-reliability high-voltage explosion-proof motor winding anti-corona structure which comprises the following components: an electromagnetic wire, an epoxy impregnated paint, a high-permeability low-gum mica tape, a high-performance low-resistance tape, a dacron glass tape, a coating material, a high-performance high-resistance tape and a single-face air-permeable protective tape; the high-permeability low-gum mica tape is arranged on the electromagnetic wire and forms a mica wrapping layer on the surface of the electromagnetic wire; the high-performance low-resistance tape is arranged on the mica wrapping layer; the dacron glass tape is arranged on the high-performance low-resistance tape; the coating material is arranged on the dacron glass tape; the high-performance high-resistance tape is arranged on the coating material; the single-face air-permeable protective tape is arranged on the high-performance high-resistance tape; the epoxy impregnated paint is impregnated by vacuum pressure, penetrates among the high-permeability low-gum mica tape, the high-performance low-resistance tape, the dacron glass tape, the coating material, the high-performance high-resistance tape and the single-face air-permeable protective tape, and forms a complete toughened insulation layer. The problems of local overheating and insulation damage caused by corona discharge can be avoided.

Description

Technical Field

[0001] This invention relates to the technical field, specifically to a high-reliability anti-corona structure for high-voltage explosion-proof motor windings. Background Technology

[0002] The national standard GB3836.3-2010 "Explosive Atmospheres - Part 3: Equipment Protected by Increased Safety Type 'e'" imposes more stringent requirements on explosion-proof motors, requiring that the insulation system and connecting cables should not generate corona and sparks that could lead to an explosion when subjected to AC withstand voltage tests and impact withstand voltage tests relative to ground in a specified explosive gas mixture.

[0003] When stator windings of high-voltage motors, generators, and special motors operate at voltage levels of 6kV and above, electric field distortion and localized field concentration are prone to occur at the slot exits, ends, and main insulation surfaces of the winding bars, leading to corona discharge. The ozone, nitrogen oxides, and other reactive substances generated by corona discharge continuously corrode the insulation material. Simultaneously, the discharge heat effect and high-energy particle bombardment accelerate the aging of the main insulation, causing insulation breakdown, excessive partial discharge, and other problems, severely shortening the motor's service life and limiting the improvement of motor voltage levels and single-unit capacity. Therefore, installing a reliable anti-corona structure on the outside of the main insulation of the winding to homogenize the electric field and suppress corona discharge has become a key technical aspect of high-voltage motor insulation systems. Existing anti-corona structures typically address problems such as localized overheating and insulation damage caused by corona discharge. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem of local overheating and insulation damage caused by corona discharge in the existing anti-corona structure, thereby providing a highly reliable anti-corona structure for high-voltage explosion-proof motor windings.

[0005] To address the aforementioned technical problems, this invention provides a high-reliability anti-corona structure for high-voltage explosion-proof motor windings, comprising: an electromagnetic wire, an epoxy-based impregnating varnish, a highly permeable, low-resistance mica tape, a high-performance, low-resistance tape, a polyester-glass tape, a coating material, a high-performance, high-resistance tape, and a single-sided ventilated protective tape. The highly permeable, low-resistance mica tape is disposed on the electromagnetic wire, forming a mica wrapping layer on its surface. The high-performance, low-resistance tape is disposed on the mica wrapping layer. The polyester-glass tape is disposed on the high-performance, low-resistance tape, and a coating material is applied to the polyester-glass tape. The high-performance, high-resistance tape is disposed on the coating material. The single-sided ventilated protective tape is disposed on the high-performance, high-resistance tape. The epoxy-based impregnating varnish undergoes vacuum pressure impregnation, permeating between the highly permeable, low-resistance mica tape, the high-performance, low-resistance tape, the polyester-glass tape, the coating material, the high-performance, high-resistance tape, and the single-sided ventilated protective tape, forming a complete toughened insulation layer.

[0006] Furthermore, the thickness of the high-permeability, low-adhesion mica tape is 0.13 mm, and the total thickness is 2.0 mm.

[0007] Furthermore, the coating material includes a first component and a second component. The first component includes 22% to 25% epoxy resin, 50% to 60% powder, and 15% to 30% first organic solvent. The second component includes 40% to 55% modified polyamide resin and 45% to 60% organic solvent.

[0008] Furthermore, the powder is composed of silicon carbide, a nano-core-shell structure modifier, and fillers.

[0009] Furthermore, the core of the nano-core-shell structure modifier is silicon carbide, and the shell of the nano-core-shell structure modifier is selected from one or more of silicon oxide, aluminum oxide, and titanium oxide.

[0010] Furthermore, the epoxy impregnating varnish is a pure epoxy impregnating varnish.

[0011] Furthermore, the thickness of the toughened insulating layer is 0.26 mm on one side.

[0012] Furthermore, the high-performance, high-resistance band has a resistance of 1×10¹⁰ to 1×10¹² Ω and a conductive component ratio of 30% to 50%.

[0013] Furthermore, the high-performance, low-resistivity band has a resistivity range of 10³ to 10⁴ Ω·cm, and the conductive component comprises 15% to 20% carbon black or silicon carbide microparticles.

[0014] Furthermore, the resistivity of the high-permeability, low-adhesion mica tape ranges from 10⁸ to 10¹⁰ Ω·cm, and the conductive component accounts for ≤5% of nano-antimony-doped tin oxide.

[0015] The technical solution of this invention has the following advantages: The present invention provides a high-reliability high-voltage explosion-proof motor winding anti-corona structure, comprising: an electromagnetic wire, an epoxy impregnation varnish, a high-permeability low-resistance mica tape, a high-performance low-resistance tape, a polyester-glass tape, a coating material, a high-performance high-resistance tape, and a single-sided ventilated protective tape. The high-permeability low-resistance mica tape is disposed on the electromagnetic wire, forming a mica wrapping layer on the surface of the electromagnetic wire. The high-performance low-resistance tape is disposed on the mica wrapping layer. The polyester-glass tape is disposed on the high-performance low-resistance tape, and a coating material is disposed on the polyester-glass tape. The high-performance high-resistance tape is disposed on the coating material. The single-sided ventilated protective tape is disposed on the high-performance high-resistance tape. The epoxy impregnation varnish is impregnated under vacuum pressure, allowing pressure to penetrate between the high-permeability low-resistance mica tape, the high-performance low-resistance tape, the polyester-glass tape, the coating material, the high-performance high-resistance tape, and the single-sided ventilated protective tape, forming a complete toughened insulation layer.

[0016] The electromagnetic wire serves as the conductive carrier, and its self-insulation protects against inter-turn potential difference surges. High-permeability, low-resistance mica tape acts as the main insulation layer, with directional mica scales forming a "labyrinthine" corona-resistant path. High-performance, low-resistance and high-performance, high-resistance tapes balance the internal field strength distribution of the coil, suppressing partial discharge. Polyester glass tape and single-sided breathable protective tape serve as reinforcing materials, further improving the mechanical strength of the insulation structure and reducing the impact of external stress on its interior. Coating materials hydrophobize the surface of the insulation structure, blocking surface creepage. When partial discharge occurs, the high-performance, low-resistance tape preferentially conducts and dissipates energy, the high-permeability, low-resistance mica tape absorbs mechanical stress through interlayer slippage, and the impregnated varnish network prevents the extension of discharge carbonization channels.

[0017] This high-reliability anti-corona structure for high-voltage explosion-proof motor windings optimizes the electric field distribution and ensures good contact between the insulation surface and the stator core. These anti-corona measures prevent localized overheating and insulation damage caused by corona discharge, allowing the motor windings to maintain stable electrical performance during long-term operation. The high-reliability anti-corona insulation structure effectively prevents corona from eroding and aging the insulation of the high-voltage explosion-proof motor windings, extending the service life of the insulation materials, enabling the motor to operate stably for a long time, reducing the frequency of maintenance and replacement, and lowering maintenance costs.

[0018] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or necessary features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the anti-corona structure for high-reliability high-voltage explosion-proof motor windings provided by the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Electromagnetic wire; 2. Epoxy impregnation varnish; 3. High-permeability mica tape with low adhesive powder; 4. High-performance low-resistance tape; 5. Polyester-glass tape; 6. Coating materials; 7. High-performance high-resistance tape; 8. Single-sided breathable protective tape. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0023] The preferred embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0024] Please see Figure 1 As shown, this invention provides a high-reliability anti-corona structure for high-voltage explosion-proof motor windings, comprising: an electromagnetic wire 1, an epoxy impregnation varnish 2, a high-permeability, low-resistance mica tape 3, a high-performance, low-resistance tape 4, a polyester-glass tape 5, a coating material 6, a high-performance, high-resistance tape 7, and a single-sided breathable protective tape 8; the high-permeability, low-resistance mica tape 3 is disposed on the electromagnetic wire 1, and a mica wrapping layer is formed on the surface of the electromagnetic wire 1; the high-performance, low-resistance tape 4 is disposed on the mica wrapping layer; the polyester-glass tape 5 is disposed on the high-performance, low-resistance tape 4; the polyester-glass tape 5 is coated with the coating material 6; the high-performance, high-resistance tape 7 is disposed on the coating material 6; and the single-sided breathable protective tape 8 is disposed on the high-performance, high-resistance tape 7. The epoxy impregnation varnish 2 is impregnated under vacuum pressure, and the pressure penetrates between the high-permeability, low-resistance mica tape 3, the high-performance, low-resistance tape 4, the polyester-glass tape 5, the coating material 6, the high-performance, high-resistance tape 7, and the single-sided breathable protective tape 8, forming a complete toughened insulation layer.

[0025] Electromagnetic wire 1 serves as the conductive carrier, its own insulation protecting against inter-turn potential difference surges. High-permeability, low-resistance mica tape 3 acts as the main insulation layer, its directional arrangement of mica flakes creating a "labyrinthine" corona-resistant path. High-performance, low-resistance tape 4 and high-performance, high-resistance tape 7 balance the internal field strength distribution of the coil, suppressing partial discharge. Polyester glass tape 5 and single-sided breathable protective tape 8 serve as reinforcing materials, further enhancing the mechanical strength of the insulation structure and reducing the impact of external stress on its interior. Coating material 6 hydrophobizes the surface of the insulation structure, preventing surface creepage. When partial discharge occurs, high-performance, low-resistance tape 4 preferentially conducts and dissipates energy, while the high-permeability, low-resistance mica tape 3 absorbs mechanical stress through interlayer slippage, and the impregnated varnish network prevents the extension of discharge carbonization channels.

[0026] This high-reliability anti-corona structure for high-voltage explosion-proof motor windings optimizes the electric field distribution and ensures good contact between the insulation surface and the stator core. These anti-corona measures prevent localized overheating and insulation damage caused by corona discharge, allowing the motor windings to maintain stable electrical performance during long-term operation. The high-reliability anti-corona insulation structure effectively prevents corona from eroding and aging the insulation of the high-voltage explosion-proof motor windings, extending the service life of the insulation materials, enabling the motor to operate stably for a long time, reducing the frequency of maintenance and replacement, and lowering maintenance costs.

[0027] When in use, the electromagnetic wire 1 is shaped by winding, expanding, and pressing, and then wrapped with a highly permeable, low-adhesion mica tape 3 to form a mica wrapping layer on the surface of the electromagnetic wire 1.

[0028] High-permeability, low-adhesion mica tape 3 is modified with epoxy resin adhesive. By introducing hyperbranched polymers into the epoxy resin network, the hyperbranched polymers, which have highly branched three-dimensional structures, have hydroxyl (-OH), carboxyl (-COOH), and amino (-NH2) groups at the ends of their molecular chains. These groups endow the hyperbranched polymers with reactivity, enabling them to chemically react with the epoxy resin and achieve the modification purpose.

[0029] The ring-opening reaction between the epoxy and hydroxyl groups in epoxy resin is utilized, allowing the epoxy groups to bond with the hydroxyl groups. Carboxyl groups participate in the esterification reaction, attaching the hyperbranched polymer to the epoxy resin molecular chain. The amount of hyperbranched polymer added is 5%-30% of the epoxy resin weight; the actual addition ratio needs to be determined based on the performance requirements of the mica tape, balancing the flexibility and strength properties of the high-permeability, low-adhesion mica tape. The branching degree of the hyperbranched polymer is between 0.5 and 0.8; higher branching results in a more compact molecular structure, but excessively high branching leads to increased viscosity. The functional group density range of the hyperbranched polymer is 0.5-3 mmol / g. The functional group density determines its reactivity with epoxy resin and its effect on improving material properties; higher density indicates higher reactivity and a more significant modification effect on epoxy resin. However, excessively high density may trigger side reactions, affecting the stability of material properties.

[0030] The ends of the molecular chains contain a large number of functional groups. These branched structures have good flexibility and flowability, and can act as internal plasticizers in epoxy resins, increasing the mobility of the molecular chains and thus improving the toughness of the epoxy resins.

[0031] The high-permeability, low-adhesion mica tape 3 made using this epoxy resin exhibits excellent flexibility and good processability for wrapping coils (rods). It solves the problems of ordinary epoxy resin-made mica tapes being hard, brittle, and having poor wrapping processability.

[0032] Chemical reaction principle: Terminal hydroxyl groups react with Lewis acid catalysts (such as BF3). Under the action of OEt2, it acts as a nucleophile to attack the epoxy groups of the epoxy resin, initiating a ring-opening reaction to form ether bonds and secondary hydroxyl groups. The generated secondary hydroxyl groups can further participate in cross-linking reactions, enhancing interfacial bonding. The terminal carboxyl groups undergo esterification reactions with epoxy groups under high temperature (100–150℃) or tertiary amine catalysts (such as DMP-30), generating ester bonds and secondary hydroxyl groups.

[0033] Example 1: Grafting of hydroxyl-terminated hyperbranched polyester polyol (HBP-PG) with bisphenol A type epoxy resin (DGEBA) Raw materials: hyperbranched polyester polyol (HBP-PG, hydroxyl-terminated, branching degree 0.58, Mw=8,000g / mol), bisphenol A type epoxy resin (E-51, epoxy equivalent 185–195g / eq), catalyst: BF3 OEt2 (0.5wt%), HBP-PG (5wt%) and BF3 OEt2 was added to E-51 and stirred at 80°C for 30 minutes to promote the pre-reaction of hydroxyl and epoxy groups.

[0034] Example 2: Epoxy resin modified with carboxyl-terminated hyperbranched polyester (HBPE-COOH) Raw materials: terminal carboxyl hyperbranched polyester (HBPE-COOH, branching degree 0.62, Mw=12,000g / mol, carboxyl equivalent=200g / eq), bisphenol F type epoxy resin (DGEBF, YDF-170, epoxy equivalent=170g / eq), catalyst: DMP-30 (0.8wt%) Reaction steps: HBPE-COOH (15wt%), DMP-30 (0.8wt%) and DGEBF were melt-mixed at 100°C for 30 minutes.

[0035] To meet the aging resistance requirements of motor main insulation under long-term high-temperature conditions, a benzene ring structure was introduced into the epoxy resin backbone through molecular design. The hydroxyl groups in the epoxy resin undergo an esterification reaction with phthalic anhydride, allowing the benzene ring groups to be covalently attached to the molecular chain. The addition of benzene ring compounds at 10%-30% of the epoxy resin enhances the interaction between epoxy resin molecular chains, and the rigid structure of the benzene ring restricts the movement of the epoxy resin molecular chains, making them less prone to deformation and relaxation at high temperatures. This increases the glass transition temperature (Tg) and thermal decomposition temperature (Td) of the epoxy resin, resulting in lower hot dielectric losses in the insulation structure and significantly extending the aging life of the main insulation material under long-term motor operation.

[0036] By introducing epoxy resin accelerators (which are one or more mixtures of 2-methylimidazole, dimethylbenzylamine, zinc neodecanoate, and triethylamine, with typical groups including tertiary amino groups and imidazole rings) into the adhesive, the accelerator is added at a rate of 0.3%-3.0% of the epoxy resin. When used in conjunction with VPI impregnation, the accelerator provides catalytically active sites, lowers the activation energy of the reaction between the epoxy resin and the curing agent, and accelerates the curing rate. This increases the coating thickness of the insulation structure, promotes uniform resin distribution within the insulation structure, forms a continuous insulating medium, and reduces the risk of partial discharge. This significantly improves the long-term reliability of motor operation.

[0037] High-permeability, low-adhesive mica tape 3 is made from mica fragments through pulping and papermaking. During the papermaking process, a gradient pressure process is introduced, causing the mica sheets to arrange in parallel layers. This gradient pressure process involves applying gradually changing pressure during the mica papermaking process. Under pressure, the mica sheets are compressed, overcoming the forces between them, and arranging themselves in parallel layers, similar to the neat arrangement of paper in a book. Previously, the mica sheets were randomly arranged and their orientation disordered, resulting in a denser structure in the mica paper. While increasing the mica content, the thickness remains unchanged. This high-density mica paper structure reduces interlayer air gaps and micropores, improving dielectric strength.

[0038] Through molecular design, microstructure regulation, and composite process integration, the bottleneck problems of traditional mica tape in terms of flexibility, heat resistance, and electrical performance have been systematically solved, providing technical support for the upgrading of high-performance motor insulation materials.

[0039] The high-voltage stator coil and winding anti-corona treatment employs a gradient composite insulation process. The straight sections of the stator coil are wrapped with low-resistance tape to reduce the potential gradient, while the ends of the stator coil are wrapped with high-resistance tape. High-resistance anti-corona material is then applied, followed by an inner shield with additional insulation using a high-performance high-resistance tape. This ensures a reasonable voltage gradient structure design. This anti-corona structure can address the most critical areas in high-voltage motor windings prone to corona, such as the slot opening electric field concentration area, the high-potential area at the ends, and the area between the coil surface and the core within the slot.

[0040] The high-permeability, low-adhesion mica tape 3 has a thickness of 0.13 mm and a total thickness of 2.0 mm.

[0041] The coating material 6 includes a nonlinear conductive material as a separately packaged first component and a second component. Based on the total mass of the first component as 100%, the first component includes 22%~25% epoxy resin, 50%~60% powder, and 15%~30% first organic solvent. The powder is composed of silicon carbide, a nano-core-shell structure modifier, and filler. The core of the nano-core-shell structure modifier is silicon carbide, and the shell of the nano-core-shell structure modifier is selected from one or more of silicon oxide, aluminum oxide, and titanium oxide. Based on the total mass of the second component being 100%, the second component includes 40%~55% modified polyamide resin and 45%~60% organic solvent.

[0042] The coating material 6 has high resistance, high corona initiation voltage and high voltage resistance, which can reduce the surface electric field strength and reduce the end field strength distortion rate by more than 60%; the aging resistance is enhanced, and the resistance stability is increased by 3 times after thermal aging at 150℃, thereby reducing the probability of corona occurrence.

[0043] Specifically, epoxy impregnating varnish 2 is a pure epoxy impregnating varnish.

[0044] The thickness of the toughened insulation layer is 0.26 mm on one side.

[0045] The high-performance, high-resistance band 7 has a resistance of 1×10¹⁰~1×10¹²Ω and a conductive component ratio of 30%~50%.

[0046] The high-performance, low-resistivity band 4 has a resistivity range of 10³ to 10⁴ Ω·cm and a conductive component ratio of 15% to 20% carbon black or silicon carbide microparticles.

[0047] The resistivity of the high-permeability, low-adhesion mica tape 3 is in the range of 108~1010 Ω·cm, and the conductive component accounts for ≤5% of nano-antimony-doped tin oxide.

[0048] Polyester-glass tape 5 is a composite tape composed of polyester and glass fiber; The anti-corona coating consists of a nonlinear conductive material (40%-50%, such as silicon carbide powder, used to achieve nonlinear volt-ampere characteristics), an epoxy resin matrix (30%-40%, bisphenol A type epoxy resin E-51 or E-44, as the main body for film formation and bonding), a solvent (15%-20%, one or more of xylene, n-butanol or acetone, used to adjust the application viscosity and evaporation rate), and a dispersant (2%-5%, such as BYK-110 or polyacrylate dispersants, used to improve powder dispersibility and system stability). It effectively suppresses local electric field concentration and improves the anti-corona performance of motors or high-voltage equipment.

[0049] 1. Experimental Grouping Control group 1: The coating was applied according to the preset process, in the following order: high performance low resistance tape 4 - polyester glass tape 5 - coating - high performance high resistance tape 7 - high permeability low adhesive powder mica tape 3 - single-sided breathable protective tape 8. Experimental Group 2: The sequence is as follows: High-performance low-resistance tape 4 - Coating - Polyester glass tape 5 - High-performance high-resistance tape 7 - High-permeability low-adhesive mica tape 3 - Single-sided breathable protective tape 8; Experimental Group 3: The sequence is as follows: High-performance low-resistance tape 4 - Polyester glass tape 5 - High-performance high-resistance tape 7 - Coating - High-permeability low-adhesive mica tape 3 - Single-sided breathable protective tape 8; Experimental Group 4: The sequence is as follows: High-performance low-resistance tape 4 - Polyester glass tape 5 - High-performance high-resistance tape 7 - High-permeability low-adhesive mica tape 3 - Coating - Single-sided breathable protective tape 8; Experimental group 5: The sequence is as follows: high performance low resistance tape 4-polyester glass tape 5-high performance high resistance tape 7-high permeability low adhesive powder mica tape 3-single-sided breathable protective tape 8-coating; Experimental group 6: No coating, in the following order: high performance low resistance tape 4-polyester glass tape 5-high performance high resistance tape 7-high permeability low adhesive powder mica tape 3-single-sided breathable protective tape 8; Indicator Comparison Data

[0050] In each experimental group, the parameters of each film layer determined in the experiment are as follows: The low-resistance band has an average resistance of 330 ohms and a thickness of 0.08 mm.

[0051] The high-resistance band has an average resistance of 5 x 10¹¹ and a thickness of 0.2 mm.

[0052] The mica tape has a thickness of 0.13 mm and a mica basis weight of (167-175) g / m2. The dielectric strength of the thin film-reinforced low-resin mica tape is ≥54MV / m, and the dielectric strength of the glass cloth-reinforced low-resin mica tape is ≥54MV / m.

[0053] The single-sided breathable protective tape has a thickness of 0.09mm and a dielectric strength of ≥45MV / m; The coating significantly improves the uniformity of the electric field at the end and the corona resistance. The optimal choice for coating position is the outer side of the polyester-glass strip 5, which can maximize the nonlinear conductivity of the coating.

[0054] After the coil is inserted into the iron core, it is impregnated with epoxy varnish and then subjected to VPI vacuum pressure impregnation. The varnish penetrates under pressure into the conductor, mica tape and anti-corona material to form a complete toughened insulation layer.

[0055] This approach ensures a uniform electric field distribution on the winding surface during high-voltage motor operation, preventing the generation of high field strength in localized areas. By increasing the electric field distribution and installing corona suppression rings, the electric field strength can be altered, thereby reducing the likelihood of corona generation.

[0056] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high-reliability anti-corona structure for high-voltage explosion-proof motor windings, characterized in that, include: Electromagnetic wire (1), epoxy impregnation varnish (2), high-permeability low-adhesion mica tape (3), high-performance low-resistance tape (4), polyester glass tape (5), coating material (6), high-performance high-resistance tape (7), single-sided breathable protective tape (8); The high-permeability low-resistance mica tape (3) is disposed on the electromagnetic wire (1) and a mica wrapping layer is formed on the surface of the electromagnetic wire (1). The high-performance low-resistance tape (4) is disposed on the mica wrapping layer. The polyester glass tape (5) is disposed on the high-performance low-resistance tape (4). The polyester glass tape (5) is coated with a coating material (6). The high-performance high-resistance tape (7) is disposed on the coating material (6). The single-sided breathable protective tape (8) is disposed on the high-performance high-resistance tape (7). The epoxy impregnation varnish (2) is impregnated under vacuum pressure, and the pressure penetrates between the high-permeability low-resistance mica tape (3), the high-performance low-resistance tape (4), the polyester glass tape (5), the coating material (6), the high-performance high-resistance tape (7), and the single-sided breathable protective tape (8), forming a complete toughened insulation layer.

2. The high-reliability high-voltage explosion-proof motor winding anti-corona structure according to claim 1, characterized in that, The thickness of the high-permeability low-adhesion mica tape (3) is 0.13 mm, and the total thickness is 2.0 mm.

3. The high-reliability high-voltage explosion-proof motor winding anti-corona structure according to claim 1, characterized in that, The coating material (6) includes a first component and a second component. The first component includes 22%~25% epoxy resin, 50%~60% powder, and 15%~30% first organic solvent. The second component includes 40%~55% modified polyamide resin and 45%~60% organic solvent.

4. The high-reliability high-voltage explosion-proof motor winding anti-corona structure according to claim 3, characterized in that, The powder is composed of silicon carbide, a nano-core-shell structure modifier, and fillers.

5. The high-reliability high-voltage explosion-proof motor winding anti-corona structure according to claim 4, characterized in that, The core of the nano-core-shell structure modifier is silicon carbide, and the shell of the nano-core-shell structure modifier is selected from one or more of silicon oxide, aluminum oxide, and titanium oxide.

6. The high-reliability high-voltage explosion-proof motor winding anti-corona structure according to claim 1, characterized in that, The epoxy impregnation varnish (2) is a pure epoxy impregnation varnish.

7. The high-reliability high-voltage explosion-proof motor winding anti-corona structure according to claim 1, characterized in that, The single-sided insulation thickness of the toughened insulation layer is 0.26 mm.

8. The high-reliability high-voltage explosion-proof motor winding anti-corona structure according to claim 1, characterized in that, The high-performance high-resistance band (7) has a resistance of 1×10¹⁰~1×10¹²Ω and a conductive component ratio of 30%~50%.

9. The high-reliability high-voltage explosion-proof motor winding anti-corona structure according to claim 1, characterized in that, The high-performance low-resistivity band (4) has a resistivity range of 103~104 Ω·cm and a conductive component ratio of 15%~20% carbon black or silicon carbide particles.

10. The high-reliability high-voltage explosion-proof motor winding anti-corona structure according to claim 1, characterized in that, The resistivity range of the high-permeability low-adhesion mica tape (3) is 108~1010 Ω·cm, and the proportion of conductive components is ≤5% nano-antimony doped tin oxide.

Images