High-voltage motor stator frame type coil insulation anti-corona structure and process method thereof

Abstract

The invention discloses a high-voltage motor stator frame-type coil insulation anti-corona structure and a process method thereof, a first insulation layer processed by a mould pressing process is arranged on a straight line edge of a frame-type coil, and a second insulation layer and a first anti-corona layer are sequentially arranged on the first insulation layer. The first insulating layer and the second insulating layer extend to the end part of the frame coil along the two ends of the length direction of the straight line side; the end part and the nose part of the frame type coil are respectively provided with a third insulating layer; the third insulating layers are connected with the second insulating layers positioned on the end part; the first insulating layer is formed by binding a high-glue mica tape, and the second insulating layer and the third insulating layer are both formed by binding a low-glue mica tape. A second anti-corona layer is arranged outside the end part upper insulating layer; and the second anti-corona layer is lapped with the first anti-corona layer. According to the insulation anti-corona structure, the technical problem that winding turn-to-turn dislocation is prone to occurring when the frame type coil is subjected to less-glue VPI insulation treatment is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of generators, and in particular relates to a high-voltage motor stator frame coil insulation anti-corona structure and a process method thereof. Background Art

[0002] At present, motors with a voltage level of 35kV have attracted much attention. In application scenarios such as wind turbines, cost reduction and efficiency improvement can be achieved by eliminating 35kV transformers and reducing the amount of motor cables. In addition, applications in fields such as phase regulators can also reduce system costs. However, there are many problems with high-voltage motors. For example, due to the electric field distortion at the end of the high-voltage winding due to deformation and other factors, the higher the voltage level, the more serious the distortion, which is prone to corona and accompanied by increased heat loss; in addition, the increase in voltage level also puts higher requirements on the safety gap of the motor, and usually requires a larger space size to solve the insulation safety problems caused by the increase in voltage. Therefore, based on the insulation structure and anti-corona structure of traditional motors, the highest voltage used in the industry is 27kV. The main insulation structure of traditional motors usually uses less-glue mica tape or more-glue mica tape, and the anti-corona structure is usually composed of a combination of nonlinear anti-corona tapes. Among them, the insulation structure using less-glue mica tape needs to be processed by vacuum pressure impregnation (VPI), and the insulation structure using more-glue mica tape needs to be processed by molding.

[0003] In terms of structure, the windings of high-voltage motors can be divided into bar-type coils and frame-type coils. Figure 1 As shown, the frame coil includes straight edges arranged approximately in parallel, and ends are provided at both ends of the straight edges. The ends of the two straight edges are connected to each other correspondingly, and a nose is provided at the connection. Among them, the strip-type wire rod can be insulated by a molding process. Usually, after the wire rod is wrapped with a multi-glue mica tape, it is hot-pressed and solidified by a mold, and then the strip-type wire rod is embedded in the core slot for connection and head welding and insulation treatment after welding; the strip-type wire rod can also be insulated by the VPI process, and then the strip-type wire rod is embedded in the core slot for connection and head welding and insulation treatment after welding. The VPI treatment method for the strip coil is called SVPI; and the frame coil is generally processed by the VPI process. The frame coil is first embedded in the core slot, and after the connection and head welding and insulation wrapping are completed, the core slot with the winding is treated by VPI as a whole. This method is called GVPI.

[0004] Based on the high-resin molding or low-resin VPI insulation treatment methods, the traditional insulation design cannot meet the performance requirements of the 35kV voltage level. For frame coils, there are mainly the following deficiencies: (1) Based on the low-resin VPI route, the low-resin mica tape has a high mica content and can achieve higher electrical strength at the same thickness. However, for frame coils, during the insulation wrapping and wire embedding process of the coil, it is easy for the winding turns to be misaligned, resulting in the low-resin mica tape being difficult to wrap tightly. After the varnishing treatment, there are problems such as air gaps or mica tape extrusion and wrinkles. Generally, the thicker the wrapping thickness, the more likely the above problems will occur. There are also attempts to complete the insulation wrapping of the straight edges of the high-voltage frame coil first, then embed it into the stator core, and then perform the end insulation wrapping. However, this requires sufficient space at the end to achieve operation. (1) The multi-resin molding process is used to mold the mica tape, which will cause a significant increase in the size of the motor structure; (2) Based on the multi-resin molding route, the mica content of the multi-resin mica tape is relatively low. In order to achieve sufficient electrical strength, the insulation structure using only the multi-resin mica tape needs to be wrapped thicker, and the thicker insulation thickness to the ground means that it is difficult for the conductor to dissipate heat, which also increases the cost; in addition, for frame coils, since the winding ends and noses require certain process adjustments during the wire embedding process, the multi-resin molding process cannot be used for the complete frame coils including straight edges, ends and noses; (3) When the voltage reaches 35kV, the safety clearance requirements between windings, between windings and machine base, etc. are higher, and the end heat dissipation requirements are more urgent; when an air-cooled structure is adopted, the structural size needs to be increased to meet the clearance and heat dissipation requirements, resulting in a significant increase in the overall cost of the whole machine. In view of the above points, for frame-type coils, whether using VPI treatment with less glue or molding treatment with more glue, the existing technical solutions may easily cause misalignment between winding turns, resulting in difficulty in wrapping, air gaps or wrinkles in mica tape after varnishing, or inability to embed wires, etc. At the same time, safety gaps and end heat dissipation are also technical difficulties in the motor design process. Summary of the invention

[0005] In response to the current technical problems, the present invention aims to provide a high-voltage motor stator frame coil insulation anti-corona structure and its process method. The insulation anti-corona structure can solve the technical problem that winding turn misalignment is prone to occur when the frame coil is subjected to low-glue VPI insulation treatment, and is suitable for high-voltage motors with a voltage level of 35KV.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A high-voltage motor stator frame coil insulation anti-corona structure, which has the following structural features: a first insulation layer processed by a molding process is provided on the straight edge of the frame coil, a second insulation layer and a first anti-corona layer are provided on the first insulation layer in sequence, and the first insulation layer and the second insulation layer are extended to the end of the frame coil along both ends of the length direction of the straight edge; a third insulation layer is provided on the end and the nose of the frame coil, and the third insulation layer is connected to the second insulation layer located on the end; the first insulation layer is wrapped with a high-resistance mica tape, and the second insulation layer and the third insulation layer are wrapped with a low-resistance mica tape; a second anti-corona layer is provided outside the insulation layer on the end, and the second anti-corona layer overlaps the first anti-corona layer.

[0008] The straight edges and part of the ends of the high-voltage motor stator frame coil of the present invention are wrapped with high-resin mica tape and molded and cured, so that the winding composed of multiple turns of electromagnetic wire forms a regular and flat structure, providing a regular wrapping basis for the subsequent wrapping of mica tape with less glue, and by fixing the straight edges of the frame coil and the part of the ends connected to the straight edges, an effective constraint is formed on the unmolded part of the coil, preventing the misalignment of the turns of the unmolded part. The frame coil of the present invention only uses the molding process for the straight edges and part of the ends, avoiding the technical difficulty of difficult molding in areas with complex shapes such as the nose, and allowing the nose of the frame coil and the end near the nose to have a certain degree of adjustability, so as not to affect the subsequent embedding of the frame coil, and through the insulation wrapping of the mica tape with less glue, it is convenient for the subsequent vacuum pressure dipping process. After high-resin mica tape is compression molded, it has good mechanical and electrical properties, while low-resin mica tape has better electrical properties after insulation treatment. The high-voltage motor stator frame coil insulation anti-corona structure of the present invention achieves comprehensive optimization of mechanical fixation and electrical properties within a limited insulation thickness range by adopting a combination design of high-resin molding and low-resin mica tape. It not only provides reliable mechanical fixation to ensure the stability of the structure, but also exhibits good electrical properties.

[0009] Preferably, the second anti-corona layer is arranged outside the second insulating layer on the end portion, and along the length direction of the end portion, the length of the second anti-corona layer is smaller than the length of the second insulating layer on the end portion.

[0010] Preferably, the second anti-corona layer includes a medium-resistance band layer, a medium-high resistance band layer and a high resistance band layer which are arranged in sequence along the length direction of the end portion, the medium-resistance band layer overlaps with the first anti-corona layer, the medium-high resistance band layer overlaps with the medium resistance band layer, and the high resistance band layer overlaps with the medium-high resistance band layer.

[0011] Preferably, the medium resistance band layer has a surface resistance value of 10 8 Ω~10 9The middle resistance tape layer is wrapped with a surface resistance value of 10 9 Ω~10 10 The high resistance tape layer is wrapped with a medium resistance tape of 10Ω, the wrapping length of the medium resistance tape layer at the end is 115-155mm, and the overlapping length of the medium resistance tape layer and the medium resistance tape layer is 15-25mm; the high resistance tape layer adopts a surface resistance value of 10 11 Ω~10 13 The high resistance tape layer is wrapped with a high resistance tape of 105 to 135 mm at the end, and the overlapping length of the high resistance tape layer and the medium and high resistance tape layer is 15 to 25 mm; the surface resistance value of the first anti-corona layer is 10 2 Ω~10 3 It is wrapped with a low resistance band of Ω.

[0012] Preferably, the thickness of the first insulating layer is 1 to 3 mm, the thickness of the second insulating layer and the third insulating layer are both 5 to 6 mm, and the second insulating layer and the third insulating layer are integrally connected to form an integral structure. After the multi-glue molding achieves a main insulation thickness of 1 to 3 mm, the wrapping thickness of the mica tape with less glue on the straight edge can be reduced, and the penetration difficulty of the dipping varnish in the subsequent VPI process can be reduced, thereby achieving a more economical insulation treatment process. The main insulation near the nose position on the end is thinned, and the gap at the end of the winding is increased without sacrificing performance requirements, thereby improving the heat dissipation effect of the end; at the same time, it can also save material use, reduce production costs, and improve economic benefits.

[0013] Preferably, the mica content of the low-resin mica tape in the second and third insulating layers is 70% to 80%, and the air permeability is 200s / 100ml to 500s / 100ml; the mica content of the high-resin mica tape in the first insulating layer is 40% to 60%, and the high-resin mica tape and low-resin mica tape are both reinforced with aramid fiber. Reinforcing the mica tape with aramid fiber can increase the mechanical properties of the insulating layer.

[0014] Preferably, the outer surface of the second anti-corona layer is provided with a fourth insulating layer and an outer insulating layer in sequence, and the outer insulating layer extends to the nose, and the fourth insulating layer is wrapped with a low-rubber mica tape. The outer insulating layer is an insulating layer provided in the prior art, and can be a glass fiber cloth reinforced polyester film protective tape or a glass ribbon.

[0015] Based on the same inventive concept, the present invention also provides a high-voltage motor stator frame coil insulation anti-corona process method, using the high-voltage motor stator frame coil insulation anti-corona structure as described above, the process method comprises the following steps:

[0016] S1. The frame coil after the insulation anti-corona wrapping is embedded in the stator core, the lead wires of each coil are welded and insulated, and then vacuum pressure dipping is carried out;

[0017] S2. The stator core with winding processed in step S1 is mounted in the generator casing, and the base is filled with insulating oil.

[0018] Compared with the traditional air heat dissipation or end potting glue solution, the high-voltage motor stator frame coil insulation anti-corona process method of the present invention immerses the winding end in insulating oil, effectively solving the heat dissipation problem caused by thick insulation, and because the insulating oil has good insulation performance, the safety margin of the insulation structure is further improved.

[0019] Preferably, in step S1, the second insulating layer and the third insulating layer on the frame coil are wrapped with an insulation wrapping tension of 55 to 70 N. A greater wrapping tension is used during the wrapping of the less-glue mica tape, so that the wrapping area of ​​the less-glue mica tape is more compact, and the purpose of increasing the mica content within the same thickness is achieved while improving the wrapping regularity.

[0020] Preferably, in step S2, the long-term heat-resistant temperature of the insulating oil is not less than 130°C.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention provides an anti-corona structure for the insulation of the frame coil of the high-voltage motor stator. The straight edges and part of the ends of the frame coil are wrapped and molded with a 1-3 mm thick multi-resin mica tape, so that the winding composed of multiple turns of electromagnetic wire is formed into a structure with a regular shape and a flat surface, providing a regular wrapping basis for the subsequent wrapping with a small amount of mica tape. By fixing the straight edges of the frame coil and part of the ends connected to the straight edges, an effective constraint is formed on the unmolded part of the coil, thereby preventing the misalignment of the turns of the unmolded part.

[0023] (2) The anti-corona structure and process method of the high-voltage motor stator frame coil of the present invention only adopts the molding process for the straight edge and part of the end of the frame coil. The end and nose of the frame coil have a certain degree of adjustability, which does not affect the wire embedding of the frame coil. The method of wrapping with a small amount of mica tape and then VPI treatment avoids the technical difficulty of using molding for complex shapes such as the nose;

[0024] (3) The anti-corona structure and process method of the stator frame coil insulation of the high-voltage motor of the present invention, after the main insulation thickness of 1 to 3 mm is achieved by multi-glue molding, the wrapping thickness of the mica tape with less glue on the straight edge is reduced, and the penetration difficulty of the impregnation varnish in the VPI treatment process is reduced, thereby achieving a more economical insulation treatment process, so that a greater wrapping tension can be used in the wrapping process of the mica tape with less glue, making the wrapping area of ​​the mica tape with less glue more compact, while improving the wrapping regularity, achieving the purpose of increasing the mica content within the same thickness;

[0025] (4) The anti-corona structure of the high-voltage motor stator frame coil insulation and the process method thereof of the present invention realizes the comprehensive optimization of mechanical fixation and electrical performance within a limited insulation thickness range by adopting a combination design of high-glue molding and low-glue mica tape, which not only provides reliable mechanical fixation and ensures the stability of the structure, but also exhibits excellent electrical performance;

[0026] (5) Compared with the traditional air heat dissipation or end potting glue solution, the anti-corona structure and process method of the stator frame type coil of the high-voltage motor of the present invention immerses the winding end in insulating oil, effectively solving the heat dissipation problem caused by thick insulation. In addition, since the insulating oil has good insulation performance, the safety margin of the insulation structure is further improved.

[0027] (6) The anti-corona structure and process method of the high-voltage motor stator frame coil insulation of the present invention have a thinned design for the main insulation near the nose of the frame coil end, which increases the gap at the winding end without sacrificing performance requirements, thereby improving the heat dissipation effect of the end; at the same time, it saves material usage and reduces production costs, making the design scheme have obvious advantages in economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the frame coil structure;

[0029] Figure 2 It is a schematic diagram of the structure of the first insulating layer in the anti-corona structure of the stator frame type coil of the high-voltage motor of the present invention;

[0030] Figure 3 It is a schematic structural diagram of the first anti-corona layer and the second anti-corona layer in the anti-corona structure of the stator frame type coil of the high-voltage motor of the present invention;

[0031] Figure 4 It is a schematic diagram of the straight-line side cross-sectional structure of the high-voltage motor stator frame coil insulation anti-corona structure of the present invention;

[0032] Figure 5 It is a schematic diagram of the cross-sectional structure of the end portion close to the straight line edge in the anti-corona structure of the stator frame type coil of the high-voltage motor of the present invention;

[0033] Figure 6 It is a schematic diagram of the end portion close to the nose and the nose cross-sectional structure of the high-voltage motor stator frame coil insulation anti-corona structure of the present invention.

[0034] In the figure

[0035] 1-frame coil, 101-straight edge, 102-end, 103-nose, 2-first insulating layer, 3-second insulating layer, 4-first anti-corona layer, 5-third insulating layer, 6-second anti-corona layer, 601-medium resistance band layer, 602-medium high resistance band layer, 603-high resistance band layer, 7-fourth insulating layer, 8-outer insulating layer. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0037] like Figure 2 As shown, this embodiment provides a high-voltage motor stator frame coil insulation anti-corona structure, and a first insulation layer 2 processed by a molding process is provided on the straight edge 101 of the frame coil 1. Figure 4 and Figure 5 As shown, the first insulating layer 2 is provided with a second insulating layer 3 and a first anti-corona layer 4 in sequence, and the first insulating layer 2 and the second insulating layer 3 are extended to the end 102 of the frame coil 1 along both ends of the length direction of the straight line edge 101, and the surface resistance value of the first anti-corona layer 4 is 10 2 Ω~10 3 The first insulating layer 2 is wrapped with a low resistance band of Ω, and the thickness of the first insulating layer 2 is 1 to 3 mm. Figure 6 As shown, a third insulating layer 5 is provided on the end 102 and the nose 103 of the frame coil 1. The third insulating layer 5 is integrally connected with the second insulating layer 3 located on the end 102 to form an integral structure. The thickness of the second insulating layer 3 and the third insulating layer 5 are both 5 to 6 mm. The first insulating layer 3 is wrapped with high-resin mica tape, and the second insulating layer 3 and the third insulating layer 5 are both wrapped with low-resin mica tape. The mica content of the low-resin mica tape in the second insulating layer 3 and the third insulating layer 5 is 70% to 80%, and the air permeability is 200s / 100ml to 500s / 100ml. The mica content of the high-resin mica tape in the first insulating layer 2 is 40% to 60%, and the high-resin mica tape and the low-resin mica tape are both reinforced with aramid fiber. As shown Figure 3 and Figure 5As shown, the second anti-corona layer 6 is provided outside the second insulating layer 3 on the end 102, and the second anti-corona layer 6 overlaps with the first anti-corona layer 4. Along the length direction of the end 102, the length of the second anti-corona layer 6 is less than the length of the second insulating layer 3 on the end 102. The second anti-corona layer 6 includes a medium resistance band layer 601, a medium-high resistance band layer 602 and a high resistance band layer 603 arranged in sequence along the length direction of the end 102, the medium resistance band layer 601 overlaps with the first anti-corona layer 4, the medium-high resistance band layer 602 overlaps with the medium resistance band layer 601, and the high resistance band layer 603 overlaps with the medium-high resistance band layer 602. The medium resistance band layer 601 adopts a surface resistance value of 10 8 Ω~10 9 The middle resistance tape layer 601 is wrapped with a medium resistance tape of Ω, the overlap length between the middle resistance tape layer 601 and the first anti-corona layer 4 is 15-25mm, and the wrapping length of the middle resistance tape layer 601 on the end 102 is 70-90mm. The middle high resistance tape layer 602 adopts a surface resistance value of 10 9 Ω~10 10 The medium-high resistance tape layer 602 is wrapped with a medium-high resistance tape of Ω, the wrapping length of the medium-high resistance tape layer 602 on the end 102 is 115-155mm, and the overlapping length of the medium-high resistance tape layer 602 and the medium resistance tape layer 601 is 15-25mm. The high resistance tape layer 603 adopts a surface resistance value of 10 11 Ω~10 13 The high resistance tape layer 603 is wrapped with a high resistance tape of Ω, the wrapping length of the high resistance tape layer 603 on the end 102 is 105-135mm, and the overlapping length of the high resistance tape layer 603 and the medium and high resistance tape layer 602 is 15-25mm. Figure 5 and Figure 6 As shown, the outer surface of the second anti-corona layer 6 is provided with a fourth insulating layer 7 and an outer insulating layer 8 in sequence, and the outer insulating layer 8 extends to the nose 103. The fourth insulating layer 7 is wrapped with a low-resistance mica tape, and the outer insulating layer 8 is wrapped with a glass fiber cloth reinforced polyester film protective tape or a glass ribbon.

[0038] This embodiment also provides a high-voltage motor stator frame coil insulation anti-corona process method, using the above-mentioned high-voltage motor stator frame coil insulation anti-corona structure, the process method includes the following steps:

[0039] S1. The winding of the frame coil 1 is wound by electromagnetic wire. The electromagnetic wire insulation is first wrapped with a polyimide film coated with F46 resin and sintered. The outer layer is wrapped with glass fiber, and the glass fiber is coated with a self-adhesive with a heat resistance grade of F or above. The thickness of the electromagnetic wire insulation is 0.3mm~0.4mm; the straight edge 101 and part of the end 102 of the frame coil 1 are wrapped with a first insulating layer 2, and the end of the first insulating layer 2 is wrapped with a multi-glue mica tape at the end 102. The end position adopts a conical overlap method, and conical areas are reserved at the four ends 102. The interval between each layer of multi-glue mica tape in the four conical areas is 1mm~3mm; after completing the wrapping of the first insulating layer 2, the wrapped area is cured by a molding process, and the curing temperature is 150℃~170℃, curing time 0.5h~2h; wrap the second insulation layer 2 and the third insulation layer 3 of the frame coil 1, the insulation wrapping adopts a constant tension tape wrapping machine, and the wrapping tension is 55N~70N; the wrapped frame coil 1 is wrapped with the first anti-corona layer 4 on the straight edge 101, and the second anti-corona layer 6 is wrapped on the end 102; the fourth insulation layer 7 and the outer insulation layer 8 are wrapped outside the second anti-corona layer 6; the frame coil 1 after the insulation anti-corona wrapping is embedded in the stator core, the lead wires of each coil are welded, and the connecting wires after welding are insulated and wrapped, and the connecting wires between each coil are wrapped with less-glue mica tape, and the wrapping thickness is 7mm~9mm; the stator core with winding is treated with vacuum pressure varnishing process;

[0040] S2. The stator core with windings treated by vacuum pressure varnishing process is mounted in the generator casing, and the base is filled with insulating oil, the long-term heat resistance temperature of the insulating oil is not less than 130°C.

[0041] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the embodiments made by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. A high voltage motor stator frame coil insulation anti-corona structure, characterized in that: A first insulating layer (2) processed by a molding process is provided on the straight edge (101) of the frame coil (1), and a second insulating layer (3) and a first anti-corona layer (4) are provided on the first insulating layer (2) in sequence, and the first insulating layer (2) and the second insulating layer (3) are both extended along both ends of the length direction of the straight edge (101) to the end (102) of the frame coil (1); a third insulating layer (5) is provided on the end (102) and the nose (103) of the frame coil (1), and the third insulating layer (5) is connected to the second insulating layer (3) located on the end (102); The first insulating layer (3) is wrapped with a high-resistance mica tape, and the second insulating layer (3) and the third insulating layer (5) are both wrapped with a low-resistance mica tape; A second anti-corona layer (6) is provided outside the insulating layer on the end portion (102), and the second anti-corona layer (6) overlaps with the first anti-corona layer (4).

2. The high-voltage motor stator frame coil insulation anti-corona structure according to claim 1 is characterized in that: The second anti-corona layer (6) is arranged outside the second insulating layer (3) on the end (102), and along the length direction of the end (102), the length of the second anti-corona layer (6) is smaller than the length of the second insulating layer (3) on the end (102).

3. The high-voltage motor stator frame coil insulation anti-corona structure according to claim 2 is characterized in that: The second anti-corona layer (6) comprises a medium resistance band layer (601), a medium-high resistance band layer (602) and a high resistance band layer (603) which are sequentially arranged along the length direction of the end portion (102); the medium resistance band layer (601) overlaps with the first anti-corona layer (4); the medium-high resistance band layer (602) overlaps with the medium resistance band layer (601); and the high resistance band layer (603) overlaps with the medium-high resistance band layer (602).

4. The high-voltage motor stator frame coil insulation anti-corona structure according to claim 3 is characterized in that: The medium resistance band layer (601) has a surface resistance value of 10 8 Ω~10 9 The middle resistance tape layer (601) is wrapped with a medium resistance tape of Ω, the overlap length between the middle resistance tape layer (601) and the first anti-corona layer (4) is 15 to 25 mm, and the wrapping length of the middle resistance tape layer (601) on the end portion (102) is 70 to 90 mm; the middle high resistance tape layer (602) is made of a material with a surface resistance value of 10 9 Ω~10 10 The medium-high resistance tape (602) is wrapped with a medium-high resistance tape of Ω, the wrapping length of the medium-high resistance tape layer (602) on the end (102) is 115-155mm, and the overlapping length of the medium-high resistance tape layer (602) and the medium resistance tape layer (601) is 15-25mm; the high resistance tape layer (603) adopts a surface resistance value of 10 11 Ω~10 13 The high resistance tape layer (603) is wrapped with a high resistance tape of 100 Ω, the wrapping length of the high resistance tape layer (603) on the end portion (102) is 105-135 mm, and the overlapping length of the high resistance tape layer (603) and the medium and high resistance tape layer (602) is 15-25 mm; the surface resistance value of the first anti-corona layer (4) is 10 2 Ω~10 3 It is wrapped with a low resistance band of Ω.

5. The high-voltage motor stator frame coil insulation anti-corona structure according to any one of claims 1 to 4, characterized in that: The thickness of the first insulating layer (2) is 1 to 3 mm, the thickness of the second insulating layer (3) and the third insulating layer (5) are both 5 to 6 mm, and the second insulating layer (3) and the third insulating layer (5) are integrally connected to form an integral structure.

6. The high-voltage motor stator frame coil insulation anti-corona structure according to any one of claims 1 to 4, characterized in that: The mica content of the low-resin mica tape in the second insulating layer (3) and the third insulating layer (5) is 70% to 80%, and the air permeability is 200s / 100ml to 500s / 100ml; the mica content of the high-resin mica tape in the first insulating layer (2) is 40% to 60%, and both the high-resin mica tape and the low-resin mica tape are reinforced with aramid fibers.

7. The high-voltage motor stator frame coil insulation anti-corona structure according to any one of claims 1 to 4, characterized in that: The outer surface of the second anti-corona layer (6) is provided with a fourth insulating layer (7) and an outer insulating layer (8) in sequence, and the outer insulating layer (8) extends to the nose (103), and the fourth insulating layer (7) is wrapped with a low-resistance mica tape.

8. A high-voltage motor stator frame coil insulation anti-corona process method, characterized in that: The high-voltage motor stator frame coil insulation anti-corona structure according to any one of claims 1 to 7 is adopted, and the process method comprises the following steps: S1. After the insulation corona-proof wrapping is completed, the frame coil (1) is embedded in the stator core, the lead wires of each coil are welded and insulated, and then vacuum pressure dipping is performed; S2. The stator core with winding processed in step S1 is mounted in the generator casing, and the base is filled with insulating oil.

9. The high-voltage motor stator frame coil insulation anti-corona process method according to claim 8, characterized in that: In step S1, the second insulating layer (3) and the third insulating layer (5) on the frame coil (1) are wrapped with insulation with a wrapping tension of 55 to 70N.

10. The high-voltage motor stator frame coil insulation anti-corona process method according to claim 8, characterized in that: In step S2, the long-term heat-resistant temperature of the insulating oil is not less than 130°C.

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