Insulation Structure and Production Process of a High-Voltage Motor

Abstract

The present invention discloses an insulation structure and production process for a high-voltage motor, including a stator core. A stator coil is embedded inside the stator core. The stator coil includes a single-glass mica tape and a flat copper wire wrapped with an imide film. The surface of the single-glass mica tape and the flat copper wire wrapped with an imide film is half-overlapped with an F-class epoxy glass low-resin mica tape. The outer surface of the F-class epoxy glass low-resin mica tape is half-overlapped with an F-class epoxy polyester film low-resin mica tape. The surface of the F-class epoxy polyester film low-resin mica tape is half-overlapped with a low-resistance corona-resistant tape. The end face part of the single-glass mica tape and the flat copper wire wrapped with an imide film is half-overlapped with an F-class epoxy polyester film low-resin mica tape. The main insulation of the high-voltage motor uses epoxy glass low-resin mica, low-resistance tape, and high-resistance tape for insulation and corona prevention treatment to reduce dielectric loss. The formed coil uses a self-adhesive glass fiber tape wrapped flat copper wire, and the corners of the coil are manufactured into a circular shape with a radian to achieve the purpose of improving the electric field at the corners.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and particularly relates to an insulation structure for a high-voltage motor. Background Art

[0002] In the existing technology, the stator part of a high-voltage motor adopts a molded coil type, that is, the straight part of the high-voltage stator coil uses a multi-layer mica tape. After hot pressing and curing, it is formed, and then the coils are embedded into the slots one by one. After the wire embedding is completed, normal-pressure immersion is carried out. The disadvantage of this process is that the mica content in the multi-layer mica tape is small, so the insulation thickness is relatively thick, resulting in less effective material in the stator slot, a large volume of the motor, low hot pressing efficiency for the straight part, and due to the use of normal-pressure immersion, there is a certain gap between the stator core and the coil, which makes the motor prone to vibration during operation, thereby damaging the insulation of the motor coil and shortening the service life of the motor.

[0003] In the existing technology, the Chinese invention patent with the patent number CN112564364B discloses an insulation structure for a high-voltage motor, including coil insulation, slot insulation and overall insulation. The coil insulation includes conductor insulation and end insulation. The slot insulation includes in-slot insulation and slot-opening insulation. The conductor insulation is a round copper wire coated with and sintered into an integral body with a polyimide-F46 composite film as the conductor.

[0004] In the above-mentioned existing technology, although the problem that the existing insulation technology cannot meet the conductor insulation requirements of a 10,000V high-voltage motor and there are dangerous situations such as discharge during use is solved, however, there are certain drawbacks in using only a multi-layer mica tape for insulation at the coil end. The electrical performance of the multi-layer mica tape is relatively weak, which may cause the insulation performance to decline when the motor is subjected to overvoltage impact during operation. Summary of the Invention

[0005] In order to solve the technical problem that the electrical performance of the multi-layer mica tape is relatively weak, which may cause the insulation performance to decline when the motor is subjected to overvoltage impact during operation, the present invention provides an insulation structure for a high-voltage motor.

[0006] In order to achieve the above object, the present invention provides the following technical solution: an insulation structure for a high-voltage motor, including a stator core, and a plurality of stator coils are embedded inside the stator core.

[0007] The stator coil includes a single-glass-coated mica tape and a flat copper wire wound with an imide film. The outer surface of the straight part of the single-glass-coated mica tape and the flat copper wire wound with an imide film is half-overlapped with an F-class epoxy glass low-resin mica tape and a glass ribbon. The outer surface of the F-class epoxy glass low-resin mica tape is half-overlapped with an F-class epoxy polyester film low-resin mica tape. The surface of the F-class epoxy polyester film low-resin mica tape is half-overlapped with a low-resistance anti-corona tape.

[0008] The end face part of the single-glass mica tape and the imide film-wrapped flat copper wire is semi-overlapped with an F-class epoxy polyester film mica tape with less glue and a high-resistance corona-resistant tape, and the high-resistance corona-resistant tape and the entire end part are semi-overlapped with a polyester-glass interwoven tape.

[0009] Optionally, a plurality of iron core slots are provided inside the stator core, the inner surface of the iron core slots is sprayed with a low-resistance corona-resistant paint, the stator coils are embedded inside the iron core slots, a slot wedge is inserted inside the iron core slots, and a spacer is provided between the slot wedge and the stator coils. The overlapping part of the high-resistance corona-resistant tape and the low-resistance corona-resistant tape on the straight extending part of the stator core is 1.8 mm thicker than the part inside the slot wedge.

[0010] Optionally, the two ends of the stator coil are leads, and a layer of polyester conformable felt is cross-padded on both sides at the lead part.

[0011] Optionally, a moisture-proof heating tape is provided at the end part of the stator coil, and a polyester-glass rope 1 is provided on the surface of the moisture-proof heating tape. The moisture-proof heating tape is tied to the stator coil through the polyester-glass rope 1.

[0012] Optionally, a polyester-glass rope 2 is tied between the polyester-glass rope 1 and the end part of the stator coil, a glass-glass rope is tied between the coils at the end part of the stator coil, and an industrial felt is tied on the surface of the polyester-glass rope 2.

[0013] Optionally, the interpolar connecting wire of the stator coil is first coated with an epoxy glass tung oil mica tape and then sleeved with a heat shrinkable tube.

[0014] Optionally, two platinum resistance temperature sensors are embedded on the surface of the stator coil.

[0015] Optionally, the surface of the spacer is wrapped with a polyester conformable felt.

[0016] Optionally, the binding parts of the glass-glass rope and the polyester-glass rope 2 are covered with a heat shrinkable plastic sleeve, an ethylene propylene rubber lead wire is fixedly installed on the surface of the stator coil, and a joint is fixedly connected to the end of the ethylene propylene rubber lead wire.

[0017] A production process for the insulation structure of a high-voltage motor is as follows:

[0018] S1. Coil insulation;

[0019] S11. Insulation of electromagnetic wire: The formed stator coil 1 is made of a self-adhesive single-glass mica tape and an imide film-wrapped flat copper wire 111, and is made by VPI vacuum pressure impregnation. The corners of the stator coil 1 are made into circular shapes with arcs.

[0020] S12. Inter-turn fixation: The straight diameter of the coil is hot-pressed and gelled at 170 - 180 °C for 10 minutes.

[0021] S13. Insulation of the lead wire 117: The lead wire 117 of the stator coil 1 is wrapped with a semi - overlapping seven - layer 0.13×25 single - sided F - class epoxy glass low - resin mica tape 112 and a layer of 0.1×25 alkali - free glass tape;

[0022] S2. Insulation against the ground;

[0023] S21. Reinforced insulation at the slot opening: From the place 20 mm into the straight part to 60 mm at the end, semi - overlap and wrap a layer of 0.13×25 F - class epoxy polyester film low - resin mica tape 113;

[0024] S22. Main insulation: Semi - overlap and wrap a total of eight layers of 0.13×25 F - class epoxy polyester film low - resin mica tape 113, and finally semi - overlap and wrap a layer of 0.08×25 low - resistance corona - resistant tape 114. The length of the low - resistance corona - resistant tape 114 is equal to the length of the straight part of the stator coil 1;

[0025] S3. End insulation;

[0026] Semi - overlap and wrap seven layers of 0.13×25 F - class epoxy polyester film low - resin mica tape 113 and a layer of 0.2×25 high - resistance corona - resistant tape 115. The high - resistance corona - resistant tape 115 overlaps with the low - resistance corona - resistant tape 114 by 20 mm. The wrapping length of the high - resistance corona - resistant tape 115 is 120 mm. The high - resistance corona - resistant tape 115 and the entire end part are semi - overlap and wrapped with a layer of 0.1×25 polyester - glass woven tape. When wrapping the end insulation, a layer of 2×10×100 m polyester conforming felt 17 needs to be cross - padded on both sides at the lead wire 117;

[0027] S4. Stator wire insertion;

[0028] S41. Before inserting the stator coil 1, the iron core slots need to be cleaned, the slot - opening chamfers need to be checked. When inserting the wire, slot liners are required, preferably 0.2 - thick 6630 composite paper with a width of 100 mm, used at both ends of the slot opening. After the stator coil 1 is inserted, it is withdrawn;

[0029] S42. Slot wedges 15 and spacer strips 14: The slot wedges 15 are made of epoxy - ester aldehyde glass plates (3240), and the spacer strips 14 (3241). The 3241 semiconductor spacer strip 14 is made of non - alkali glass fiber cloth for electrical engineering impregnated with epoxy resin, and the width is the punching slot width - 0.5;

[0030] S43. End rings;

[0031] Φ20 glass rope EER (glass - sheathed glass rope) is used as a soft end ring;

[0032] S44. Fixing of the end - winding part and the nose part of the end ring;

[0033] After the adjacent coils are tightly padded with polyester conforming felt 17, they are then tightly tied with Φ12 or Φ16 polyester-glass rope 7DER. For smaller gaps between adjacent coils, Φ20 or Φ25 polyester sleeves can be used for tying (the width of the flattened Φ25 sleeve is 30 - 35 mm). The soft end rings are tied with Φ16 or Φ20 polyester-glass rope 7, and the iron end rings are tightly tied with Φ7 polyester sleeves;

[0034] S5. Insulation of connecting wires;

[0035] Half-overlap and wrap eight layers of 0.13×25 F-class epoxy polyester film low-binder mica tape 113 (overlapping the insulation of lead wire 117 by 25 mm) and one layer of 0.1×25 glass fiber tape. The insulation tape must be wrapped to the root. After wrapping, the gap between the inter-pole connecting wires, lead wire 117 and adjacent connecting wires is 6 mm. For smaller wire gauges or for the inner and outer coil lead wire roots of 2- or 4-pole motors, a Φ12 polyester-glass rope 7DER is wound around once around the entire circumference for reinforcement and fixation;

[0036] S6. Stator impregnation;

[0037] After the stator coil 1 is wound and connected, after passing the withstand voltage test, it is impregnated with insulating paint once according to the process code VPI, and then painted on the surface after drying treatment;

[0038] S7. Lead wires;

[0039] Connected with chlorinated ether sheathed lead wire JEM - 10000 volts. At the joint, half-overlap and wrap eight layers of 0.13×25 F-class epoxy glass low-binder mica tape 112 and one layer of 0.1×25 non-alkali glass fiber tape. After completion, at 1 / 3 of the lead wire, it is tightly wound and tied with Φ16 polyester-glass rope 7DER in parallel for several turns (the phase-to-phase and phase-to-ground intervals of the lead wires are 10 mm), and brushed through with room temperature curing epoxy paint.

[0040] In summary, compared with the prior art, an insulation structure of a high-voltage motor provided by the present invention has the following beneficial effects:

[0041] 1. In the present invention, single-glass-wrapped mica tape and polyimide film wrapped flat copper wire are used. Using mica tape improves the corona resistance of the wrapped wire, and polyimide film enhances the withstand voltage breakdown performance of the wrapped wire. In addition, it also has good flexibility and strength, and is suitable for various complex motor winding structures. The outer surface of the single-glass-wrapped mica tape and polyimide film wrapped flat copper wire is half-overlapped and wrapped with seven layers of F-class epoxy glass low-binder mica tape and one layer of glass fiber tape. The outer surface of the F-class epoxy glass low-binder mica tape is coated with F-class epoxy polyester film low-binder mica tape. Using polyester film with excellent electrical properties, low hygroscopicity and low price to replace traditional reinforcing materials reduces the material cost and improves the electrical strength;

[0042] 2. In the present invention, the surface of the high-resistance corona-resistant tape is coated with a heat-shrinkable film interwoven cloth insulation protection tape, which provides excellent electrical insulation effect, ensures the stable operation of electrical equipment, and at the same time has high tensile strength and good flexibility, and is suitable for the bending part of the high-voltage motor coil;

[0043] 3. In the present invention, the overlapping part of the high-resistance corona-resistant tape and the low-resistance corona-resistant tape that extends straight out of the stator core is 1.8 mm behind the part in the slot wedge. The high-resistance corona-resistant tape has non-linear resistance characteristics, which helps to uniformize the electric field at the connection between the straight part and the bending part of the motor coil. The low-resistance corona-resistant tape further improves the electric field distribution and prevents corona generation. The combined use of the two improves the insulation strength and corona resistance of the coil, and improves the operation stability and service life of the motor;

[0044] 4. In the present invention, the interpolar connection wire of the stator coil is first coated with an epoxy glass tung oil mica tape and then sleeved with a heat-shrinkable tube. The heat-shrinkable tube has excellent electrical insulation performance, can prevent current leakage and short circuit, and ensure the safe operation of the electrical system. Brief Description of the Drawings

[0045] Figure 1 It is a schematic structural diagram of the stator core of the present invention;

[0046] Figure 2 It is a schematic structural diagram of the connection part between the spacer and the stator coil of the present invention;

[0047] Figure 3 It is a schematic structural diagram of the stator coil of the present invention;

[0048] Figure 4 It is a schematic structural diagram of the straight part of the coil of the present invention;

[0049] Figure 5 It is a schematic structural diagram of the bending part of the coil of the present invention;

[0050] Figure 6 It is a schematic structural diagram of the end part of the coil of the present invention;

[0051] Figure 7 It is a schematic structural diagram of the wrapping structure at the connection between the bending part and the straight part of the coil of the present invention;

[0052] Figure 8 It is a schematic structural diagram of the end shape of the coil of the present invention;

[0053] Figure 9 It is a schematic structural diagram of the end binding of the coil of the present invention;

[0054] Figure 10 It is a schematic structural diagram of the joint of the present invention;

[0055] In the figure: 1. Stator coil; 111. Flat copper wire wrapped with single-layer glass mica tape and imide film; 112. F-class epoxy glass mica tape with less resin; 113. F-class epoxy polyester film mica tape with less resin; 114. Low-resistance corona-resistant tape; 115. High-resistance corona-resistant tape; 116. Heat-shrinkable film interwoven cloth insulation protection tape; 117. Lead wire; 2. Moisture-proof heating tape; 3. First polyester glass rope; 4. Platinum thermal resistance sensor; 5. Stator core; 6. Glass rope; 7. Second polyester glass rope; 8. Epoxy glass tung oil mica tape; 9. Heat-shrinkable tube; 10. Industrial felt; 11. Ethylene propylene rubber lead wire; 12. Heat-shrinkable plastic sleeve; 13. Joint; 14. Gasket; 15. Slot wedge; 16. Laminated board; 17. Polyester conforming felt. Detailed implementation mode

[0056] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0057] Embodiment 1:

[0058] Refer to Figure 1 and Figure 2 , an insulation structure of a high-voltage motor, including a stator core 5. Multiple iron core slots are arranged inside the stator core 5. The inner surface of the iron core slot is sprayed with low-resistance corona-resistant paint, and multiple groups of stator coils 1 are embedded inside the iron core slot. A slot wedge 15 is inserted into the iron core slot for fixing the stator coil 1. A gasket 14 is arranged between the slot wedge 15 and the stator coil 1 for padding the gap between the slot wedge 15 and the stator coil 1.

[0059] Refer to Figure 3 and Figure 4 , the stator coil 1 is in a Y connection. The stator coil 1 includes a flat copper wire wrapped with single-layer glass mica tape and imide film 111. Using mica tape improves the corona resistance of the wrapped wire, and polyimide film enhances the voltage breakdown resistance of the wrapped wire. In addition, it also has good flexibility and strength, and is suitable for various complex motor winding structures. Seven layers of F-class epoxy glass mica tape with less resin 112 and one layer of glass ribbon are half-overlapped on the outer surface of the flat copper wire wrapped with single-layer glass mica tape and imide film 111. An F-class epoxy polyester film mica tape with less resin 113 is coated on the outer surface of the F-class epoxy glass mica tape with less resin 112. Using polyester film with excellent electrical performance, low hygroscopicity and low price to replace traditional reinforcing materials reduces the material cost and improves the electrical strength.

[0060] Refer to Figure 4, the outer surface of the Class F epoxy polyester film with less mica powder tape 113 is coated with a low-resistance corona-resistant tape 114, which is an insulating material for corona prevention treatment of motor coils and is also used for the straight part of high-voltage motor coils to prevent corona discharge and improve the operating efficiency and reliability of the motor.

[0061] Reference Figure 5 and Figure 6 , for the bent part of the high-voltage motor coil, a high-resistance corona-resistant tape 115 is coated on the outer surface of the Class F epoxy polyester film with less mica powder tape 113. It has good flexibility and is not easy to break, and is suitable for manual wrapping and machine wrapping processes. It can effectively fix and insulate the bent part of the coil. The surface of the high-resistance corona-resistant tape 115 is coated with a heat-shrinkable film interwoven cloth insulation protection tape 116, which provides excellent electrical insulation effect, ensures the stable operation of electrical equipment, and has high tensile strength and good flexibility, and is suitable for the bent part of high-voltage motor coils.

[0062] Reference Figure 5 and Figure 7 , at the connection between the bent part and the straight part of the high-voltage motor coil, a high-resistance corona-resistant tape 115 is first coated on the outer surface of the Class F epoxy polyester film with less mica powder tape 113 and then a low-resistance corona-resistant tape 114 is coated. For the part of the straight line extending out of the stator core 5, the overlapping part of the high-resistance corona-resistant tape 115 and the low-resistance corona-resistant tape 114 should be 1.8 mm thicker than the part inside the slot wedge 15. The high-resistance corona-resistant tape 115 has non-linear resistance characteristics, which helps to equalize the electric field at the connection between the straight part and the bent part of the motor coil. The low-resistance corona-resistant tape 114 further improves the electric field distribution and prevents corona generation. The two are used in combination to improve the insulation strength and corona resistance of the coil, and improve the operating stability and service life of the motor.

[0063] Reference Figure 3 and Figure 8 , at both ends of each stator coil 1 are leads 117, and the insulation layer of the leads 117 is removed.

[0064] Example Two:

[0065] Reference Figure 1 , a moisture-proof heating tape 2 is provided at the end of the stator coil 1. The moisture-proof heating tape 2 is tied to the stator coil 1 through a polyester glass rope 3, and the two ends of the moisture-proof heating tape 2 do not intersect to prevent uneven heating or local insulation damage. When the motor is not working, the moisture-proof heating tape 2 starts to work, so that the temperature of the motor winding is always higher than the ambient temperature, thereby avoiding condensation of the coil winding and ensuring the normal operation of the motor in a humid environment.

[0066] Reference Figure 1, a polyester glass rope 3 is tied to the end of the stator coil 1 with a polyester glass rope 7 for 2 - 3 turns. A glass - glass rope 6 is tied between the end coils of the stator coil 1 for fixing the end of the stator coil 1. And the glass - glass rope 6 and the end of the stator coil 1 are tied with the polyester glass rope 7 for 2 - 3 turns to further enhance the fixing effect. An industrial felt 10 is tied to the surface of the polyester glass rope 7. The industrial felt 10 can effectively isolate the oil cavity of the motor from the outside world, prevent the lubricating oil from leaking out, and at the same time prevent moisture and dust from falling into the friction area.

[0067] Reference Figure 1 , two platinum thermal resistance sensors 4 are embedded in the surface of the stator coil 1. One is embedded between the coils in the stator core 5, and the other is embedded between the end coils of the stator coil 1. The lead wires of the platinum thermal resistance sensors 4 and the moisture - proof heating tape 2 are sheathed with silica gel glass paint tubes of the same length. The silica gel glass paint tube has good dielectric properties, high heat resistance, and excellent insulation performance when sheathed on the lead wires. It can effectively isolate the high voltage inside the motor from the external environment, prevent electric leakage and mutual interference between electrical equipment, and reduce the risks of electric shock and fire.

[0068] Reference Figure 1 , the inter - pole connecting wire of the stator coil 1 is first coated with epoxy glass tung oil mica tape 8 and then sleeved with a heat - shrinkable tube 9. The heat - shrinkable tube 9 has excellent electrical insulation performance, can prevent current leakage and short - circuit, and ensure the safe operation of the electrical system.

[0069] Reference Figure 1 and Figure 9 , in the bevel part of the stator coil 1, a spacer 14 is inserted between the two sides to make it wedge - tight. And the surface of the spacer 14 is wrapped with a polyester conformable felt 17. A laminated board 16 is arranged on the surface of the bevel part of the stator coil 1 for its fixing, protection and support.

[0070] Reference Figure 10 , the tying parts of the glass - glass rope 6 and the polyester glass rope 7 are covered with heat - shrinkable plastic sleeves 12 for additional protection and insulation effects. An ethylene - propylene rubber lead wire 11 is fixedly installed on the surface of the stator coil 1. The end of the ethylene - propylene rubber lead wire 11 is fixedly connected with a joint 13 for connecting a high - voltage porcelain bottle, which can effectively isolate the live parts inside the motor, prevent current leakage, and ensure the safe operation of the motor.

[0071] A production process for the insulation structure of a high - voltage motor is as follows:

[0072] S1. Coil insulation:

[0073] S11. Insulation of electromagnetic wire: The formed stator coil 1 is made by winding a self-adhesive single-layer glass mica tape and imide film around a flat copper wire 111, and is made by VPI vacuum pressure impregnation. The corners of the stator coil 1 are made into circular arcs.

[0074] S12. Inter-turn fixation: The coil is hot-pressed and gelatinized at 170 - 180 °C for 10 minutes.

[0075] S13. Insulation of lead wire 117: The lead wire 117 of the stator coil 1 is wrapped with a semi-overlapping seven-layer 0.13×25 single-sided F-class epoxy glass mica tape with less adhesive 112 and a layer of 0.1×25 non-alkali glass ribbon.

[0076] S2. Insulation against ground:

[0077] S21. Reinforced insulation at slot opening: A semi-overlapping layer of 0.13×25 F-class epoxy polyester film mica tape with less adhesive 113 is wrapped from 20 mm into the straight part to about 60 mm at the end.

[0078] S22. Main insulation: A total of eight layers of 0.13×25 F-class epoxy polyester film mica tape with less adhesive 113 are semi-overlapped, and finally a semi-overlapping layer of 0.08×25 low-resistance anti-corona tape 114 is wrapped. The length of the low-resistance anti-corona tape 114 is equal to the length of the straight part of the stator coil 1.

[0079] S3. End insulation:

[0080] A semi-overlapping seven-layer 0.13×25 F-class epoxy polyester film mica tape with less adhesive 113 and a layer of 0.2×25 high-resistance anti-corona tape 115 are wrapped. The high-resistance anti-corona tape 115 overlaps with the low-resistance anti-corona tape 114 by 20 mm. The wrapping length of the high-resistance anti-corona tape 115 is 120 mm. A layer of 0.1×25 polyester glass woven tape is semi-overlapped on the high-resistance anti-corona tape 115 and the entire end. When wrapping the end insulation, a 2×10×100 m polyester conformable felt 17 needs to be interleaved on both sides at the lead wire 117.

[0081] S4. Stator wire insertion:

[0082] S41. Before inserting the stator coil 1, the iron core slots need to be cleaned, and the slot chamfers need to be checked. When inserting the wire, slot liners are required, preferably 0.2 thick 6630 composite paper, about 100 mm wide, for both ends of the slot opening. After the stator coil 1 is inserted, it is withdrawn.

[0083] S42. Slot wedges 15 and spacer strips 14: The slot wedges 15 are made of epoxy ester aldehyde glass plates (3240), and the spacer strips 14 (3241). The 3241 semiconductor spacer strips 14 are made of non-alkali glass fiber cloth for electrical engineering impregnated with epoxy resin, and the width is the punching slot width - 0.5.

[0084] S43. End rings;

[0085] S431. Use a Φ20 glass rope EER (glass fiber sheathed glass rope) as a soft end hoop (Solution 1);

[0086] S432. Half lap and wrap eight layers of 0.13×25 F-class epoxy polyester film low-resin mica tape 113 on the iron end hoop (Solution 2);

[0087] S44. Fix the end hoop winding at the end and nose;

[0088] After padding tightly between adjacent coils with polyester conforming felt 17, tie them tightly with a Φ12 or Φ16 polyester glass rope 7DER. If the gap between adjacent coils is small, tie them with a Φ20 or Φ25 polyester glass sleeve (the width of the flattened Φ25 sleeve is about 30 - 35 mm). Tie the soft end hoop with a Φ16 or Φ20 polyester glass rope 7, and tie the iron end hoop tightly with a Φ7 polyester glass sleeve;

[0089] S5. Insulation of connecting wires:

[0090] Half lap and wrap eight layers of 0.13×25 F-class epoxy polyester film low-resin mica tape 113 (the overlap insulation with the lead 117 is at least 25 mm) and one layer of 0.1×25 glass tape. The insulation tape must be wrapped to the root. After wrapping, the gap between the inter-pole connecting wires, the lead 117 and the adjacent connecting wires is at least 6 mm. For windings with small wire gauge cross-section or for the inner and outer coil leads at the root of 2- or 4-pole motors, wind a Φ12 polyester glass rope 7DER around the root of the leads for one full circle around the entire circumference for reinforcement and fixation.

[0091] S6. Immerse the stator in paint;

[0092] After the stator coils 1 are wound and connected, after passing the withstand voltage test, immerse them in insulating paint once according to the process code VPI, and then spray paint on the surface after drying treatment.

[0093] S7. Lead wires;

[0094] Connect with a chlorinated ether sheathed lead wire JEM - 10000V. At the joint, half lap and wrap eight layers of 0.13×25 F-class epoxy glass low-resin mica tape 112 and one layer of 0.1×25 alkali-free glass tape. After completion, at 1 / 3 of the lead wire, wind a Φ16 polyester glass rope 7DER in parallel for several turns and tie it tightly (the interval between the lead wires and between the lead wires and the ground is at least 10 mm), and brush it thoroughly with room temperature curing epoxy paint.

[0095] The insulation structure and dimensions are shown in the table:

[0096] Table 1:

[0097]

[0098] Table 2:

[0099]

[0100] Note: 1. x is the number of electromagnetic wires per coil height.

[0101] 2. The ground mica tape shall not be less than 9 layers. If the size is not reached, the number of wrapped layers shall be appropriately increased.

[0102] If certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims of this application do not use the difference in names as a way to distinguish components, but use the difference in the functions of components as the criterion for distinction. As mentioned throughout the specification and claims, the term "comprising" is an open-ended term and should be interpreted as "comprising but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0103] It should be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent in such a commodity or system. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0104] The above description shows and describes several preferred embodiments of the present application. However, as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the application concept described herein through the above teachings or the technology or knowledge in the relevant field. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present application shall fall within the protection scope of the appended claims of the present application.

Claims

1. A production process for the insulation structure of a high-voltage motor, characterized in that, The specific steps are as follows: S1. Coil insulation; S11. Insulation of electromagnetic wire: The formed stator coil (1) is wound with a self-adhesive single-layer glass mica tape and imide film around the flat copper wire (111), and is made by VPI vacuum pressure impregnation. The corners of the stator coil (1) are made into circular shapes with arcs; S12. Inter-turn fixation: The coil is hot-pressed and gelled at 170 - 180 °C for 10 minutes for the straight diameter of the coil; S13. Insulation of the lead wire (117): The lead wire (117) of the stator coil (1) is wrapped with a semi-overlapping seven-layer 0.13×25 single-sided F-class epoxy glass mica tape with less adhesive (112) and one layer of 0.1×25 non-alkali glass ribbon; S2. Insulation against the ground; S21. Reinforced insulation at the slot opening: A semi-overlapping layer of 0.13×25 F-class epoxy polyester film mica tape with less adhesive (113) is wrapped from 20 mm into the straight part to 60 mm at the end; S22. Main insulation: A total of eight layers of 0.13×25 F-class epoxy polyester film mica tape with less adhesive (113) are semi-overlapped, and finally a semi-overlapping layer of 0.08×25 low-resistance anti-corona tape (114) is wrapped. The length of the low-resistance anti-corona tape (114) is equal to the length of the straight part of the stator coil (1); S3. End insulation; A semi-overlapping seven-layer 0.13×25 F-class epoxy polyester film mica tape with less adhesive (113) and one layer of 0.2×25 high-resistance anti-corona tape (115) are wrapped. The high-resistance anti-corona tape (115) overlaps with the low-resistance anti-corona tape (114) by 20 mm. The wrapping length of the high-resistance anti-corona tape (115) is 120 mm. The high-resistance anti-corona tape (115) and the entire end are semi-overlapped with one layer of 0.1×25 polyester glass woven tape. When wrapping the end insulation, a layer of 2×10×100 m polyester conformable felt (17) needs to be cross-padded on both sides at the lead wire (117); S4. Stator wire insertion; S41. Before inserting the stator coil (1), the iron core slots need to be cleaned, the slot opening chamfer needs to be checked, and a slot liner is required during wire insertion. After the stator coil (1) is inserted, it is withdrawn; S42. Slot wedges (15) and spacer strips (14): The slot wedges (15) are made of epoxy ester aldehyde glass plates, and the spacer strips (14) are made of 3241 material. The 3241 material semiconductor spacer strips (14) are made of non-alkali glass fiber cloth for electricians impregnated with epoxy resin, and the width is the punching slot width - 0.5; S43. End rings; Φ20 glass ropes are used as soft end rings; S44. Fixation of the end ring winding end and nose; After padding tightly with polyester conformable felt (17) between adjacent coils, they are tied tightly with two (7) Φ12 or Φ16 polyester glass ropes. If the gap between adjacent coils is small, they can be tied with Φ20 or Φ25 polyester sleeves. The soft end rings are tied with two (7) Φ16 or Φ20 polyester glass ropes, and the iron end rings are tied tightly with Φ7 polyester sleeves; S5. Insulation of the connecting wires; A semi-overlapping eight-layer 0.13×25 F-class epoxy polyester film mica tape with less adhesive (113) and one layer of 0.1×25 glass ribbon are wrapped. The insulating tape must be wrapped to the root. After wrapping, the gap between the inter-pole connecting wires, the lead wire (117) and the adjacent connecting wires is 6 mm. For windings with small wire gauge cross-sections or for the inner and outer coil lead wire roots of 2- or 4-pole motors, two (7) Φ12 polyester glass ropes are wound around one circle at the root of the lead wire, for one full circle around the entire circumference, for strengthening and fixation; S6. Stator dipping; After the stator coil (1) is wired and the withstand voltage test is completed, impregnate the insulating paint once according to the process code VPI, and spray paint on the surface after drying treatment; S7. Lead wire; Connect with the chlorinated ether sheath lead wire JEM - 10000V. At the joint, half - lap and wrap eight layers of 0.13×25 F - class epoxy glass mica tape with less glue (112) and one layer of 0.1×25 non - alkali glass tape. After completion, at 1 / 3 of the lead wire, wind several turns tightly in parallel with two Φ16 polyester glass ropes (7), and brush through with room - temperature curing epoxy paint.

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