CN115118050A - High-voltage motor stator coil insulation system and preparation method thereof - Google Patents
High-voltage motor stator coil insulation system and preparation method thereof Download PDFInfo
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- CN115118050A CN115118050A CN202210853149.9A CN202210853149A CN115118050A CN 115118050 A CN115118050 A CN 115118050A CN 202210853149 A CN202210853149 A CN 202210853149A CN 115118050 A CN115118050 A CN 115118050A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/10—Applying solid insulation to windings, stators or rotors
- H02K15/105—Applying solid insulation to windings, stators or rotors to the windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/30—Windings characterised by the insulating material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
Abstract
The invention relates to a high-voltage motor stator coil insulation system which comprises a straight line part and an end part, wherein the straight line part and the end part respectively comprise a copper coil, turn-to-turn insulation coated on the outer side of the copper coil, a main insulation layer coated on the outer side of the turn-to-turn insulation, and a protection layer coated on the outer side of the main insulation layer; the main insulating layer is formed by curing a mica tape and epoxy VPI resin, the epoxy VPI resin is prepared from nano powder, a dispersing agent and epoxy resin, and the raw materials of the epoxy VPI resin do not contain anhydride. The high-voltage motor stator coil insulation system has better heat conduction performance and electrical insulation performance, can obviously reduce the temperature rise of a high-voltage motor during operation, prolongs the service life of the high-voltage motor, and has better application manufacturability.
Description
Technical Field
The invention particularly relates to a high-voltage motor stator coil insulation system and a preparation method thereof.
Background
With the development of motor manufacturing technology, the motor is required to have higher power and also required to have a compact structure, which also causes the motor to generate more heat during operation, thereby causing the temperature rise of an insulation system of the motor to be too high, and the high temperature is an important reason for reducing the electrical performance, the mechanical performance and the service life of the insulation system, and also directly influences the working efficiency of the motor. At present, the domestic high-voltage motor mainly reduces the temperature rise by improving the heat dissipation condition, so the volume and the manufacturing cost of the motor are increased, and the single-machine capacity is also greatly limited. How to fundamentally improve the heat dispersion of the motor to reduce the temperature rise, improve the electrical insulation performance of the motor and prolong the service life of the motor becomes the problem which needs to be solved urgently in the technical development of modern motors.
Disclosure of Invention
The invention aims to provide a high-voltage motor stator coil insulation system with high heat conductivity coefficient, good electrical insulation performance and long service life and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-voltage motor stator coil insulation system comprises a straight line part and an end part, wherein the straight line part and the end part respectively comprise a copper coil, an inter-turn insulation layer coated on the outer side of the copper coil, a main insulation layer coated on the outer side of the inter-turn insulation layer and a protective layer coated on the outer side of the main insulation layer; the main insulating layer is formed by curing a mica tape and epoxy VPI resin, the epoxy VPI resin is prepared from nano powder, a dispersing agent and epoxy resin, and the raw materials of the epoxy VPI resin do not contain anhydride.
Preferably, the epoxy resin is selected from epoxy modified polyester imide impregnating resins.
Preferably, the nanopowder is selected from one or more of boron nitride, aluminum oxide and aluminum nitride.
More preferably, the particle size of the nanopowder is 10 to 80nm, such as 10nm, 20nm, 30nm, 40nm, 50nm, 60nm, 70nm, etc.
Preferably, the dispersant is selected from one or more of BYK142 dispersant, BYK110 dispersant, KH550 dispersant and KH560 dispersant.
Preferably, the epoxy resin: nano powder: the feeding mass ratio of the dispersing agent is 100: (15-25): (0.5 to 1.5).
Further preferably, the epoxy resin: nano powder: the feeding mass ratio of the dispersing agent is 100: (18-22): (0.8 to 1.2).
Still further preferably, the epoxy resin: nano powder: the feeding mass ratio of the dispersing agent is 100: (19-21): (0.9-1.1).
Preferably, the mica tape is wrapped in a semi-lap wrapping mode, and the number of the wrapping layers is 5-9.
Further preferably, the thickness of the mica tape is 0.1-0.2 mm, and the heat conductivity coefficient is more than or equal to 0.4W/(m.K).
Still further preferably, the thickness of the mica tape is 0.12-0.17 mm.
Preferably, the thermal conductivity of the main insulating layer is 0.35-0.5W/(m.K).
Further preferably, the thermal conductivity of the main insulating layer is 0.4-0.5W/(m.K).
Still more preferably, the thermal conductivity of the main insulating layer is 0.45-0.5W/(m.K).
According to some preferred embodiments, the preparation method of the epoxy VPI resin comprises the steps of firstly homogenizing and emulsifying the nano powder, the dispersing agent and the epoxy resin, and then grinding and dispersing; wherein the rotation speed of the homogeneous emulsification is controlled to be 4000-6000r/min, and the time is controlled to be 1-2 h.
Further preferably, the temperature of the system material is controlled to be lower than 60 ℃ when the homogeneous emulsification and grinding dispersion are carried out.
Further preferably, the nanoparticles dispersed into the system are milled to a particle size of less than 80 nm.
Preferably, the turn-to-turn insulation is formed by wrapping 1-4 layers of polyester film reinforced mica tapes with the thickness of 0.03-0.09 mm in a half-lap wrapping mode.
Further preferably, the turn-to-turn insulation is formed by wrapping 1-3 layers of polyester film reinforced mica tapes with the thickness of 0.04-0.07 mm in a half-lap wrapping mode.
Preferably, the thickness of the turn-to-turn insulation is 0.4-0.45 mm.
Preferably, straight line portion is still including the cladding in proper order the corona layer is prevented to low resistance, the high resistance in the main insulating layer outside prevents the corona layer, the protective layer sets up the outside on corona layer is prevented to the high resistance, the corona layer is prevented by the low resistance that thickness is 0.05~0.11mm and is prevented the corona belt through 1~2 layers of half-lap package around the package and form low resistance, the corona layer is prevented by the high resistance that thickness is 0.1~0.2mm and is prevented the corona belt through 1~2 layers of half-lap package around the package and form high resistance.
Further preferably, the low-resistance corona-preventing tape is a polyester nonwoven fabric-based low-resistance corona-preventing tape.
More preferably, the high-resistance anti-corona belt is a polyester non-woven fabric high-resistance anti-corona belt filled with SiC particle glue solution, and the thickness of the high-resistance anti-corona belt is 0.1-0.2 mm.
Still further preferably, the wrapped region of the high-resistance corona-preventing tape is from an end of the low-resistance corona-preventing tape to an end of the stator coil. The corona prevention effect of the stator coil during operation is further enhanced by the aid of the high-resistance corona prevention layer.
Preferably, the end portion further includes a stator coil lead wire arranged in parallel with the copper coil, the outer side of the stator coil lead wire sequentially covers the inter-turn insulation and the polyester fiber felt, and the main insulation layer is arranged on the outer side of the inter-turn insulation on the polyester fiber felt and the copper coil.
Further preferably, the protective layer is formed by a polyester strapping tape wrap.
More preferably, the protective layer is formed by winding 1-2 layers in a half-lap-wrapping mode. The setting of protective layer makes stator coil in the curing process, can be with the epoxy VPI resin lock in main insulating layer, has reduced epoxy VPI resin and has run off, has strengthened the stability of main insulating layer.
Preferably, the high-voltage motor is a high-voltage motor of 6kV level or above.
Another aspect of the present invention provides a method for preparing an insulation system for a stator coil of a high voltage motor, which comprises the following steps: (1) winding polyester film reinforced mica tapes on a straight line part of the high-voltage motor stator coil, a copper coil at the end part and a stator coil lead at the end part to form inter-turn insulation; (2) winding a mica tape on the outer side of the turn-to-turn insulation, impregnating the mica tape with epoxy VPI resin, and curing the epoxy VPI resin and the mica tape to form a main insulation layer, wherein the raw material of the epoxy VPI resin does not contain anhydride, and the preparation method of the epoxy VPI resin comprises the steps of homogenizing and emulsifying nano powder, a dispersing agent and the epoxy resin, and then grinding and dispersing; controlling the curing temperature to be 160-170 ℃ and the curing time to be 8-13 h; (3) and winding a protective layer on the outer side of the main insulating layer.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the high-voltage motor stator coil insulation system has better heat conduction performance and electrical insulation performance, can obviously reduce the temperature rise of a high-voltage motor during operation, prolongs the service life of the high-voltage motor, and has better application manufacturability.
Drawings
FIG. 1 is a block diagram of the stator coil insulation system of a high voltage motor according to the present invention;
FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;
FIG. 3 is a schematic sectional view taken along line B-B in FIG. 1;
wherein, 1, copper coil; 2. inter-turn insulation; 3. a main insulating layer; 4. a low resistance anti-corona layer; 5. a high resistance anti-corona layer; 6. A polyester tie; 7. a stator coil lead wire; 8. polyester fiber blanket.
Detailed Description
At present, no high thermal conductivity insulation system exists for the field of high voltage motors. The inventor finds that the heat-conducting property of the insulating system can be remarkably improved by improving the heat-conducting property of the main insulating layer through research, the main insulating layer is generally formed by curing a mica tape and impregnating resin, and the mica tape and the impregnating resin in the existing main insulating layer with good application manufacturability have poor general heat-conducting property. Although some impregnating resins have certain heat-conducting property, the application manufacturability of the impregnating resins is poor, and the requirements of high-voltage motors cannot be met, so that the practical application of the impregnating resins is limited. For example, the nano modified epoxy vacuum pressure impregnation resin in patent ZL201210187846.1 is easy to absorb moisture in practical application, has fast viscosity increase, and cannot be applied to high-voltage motors.
The inventor prepares the epoxy VPI resin with high heat conductivity by modifying the epoxy resin, so that the epoxy VPI resin and the mica tape are cured to form a main insulating layer, and designs turn-to-turn insulation, a protective layer and the like to obtain the high-voltage motor stator coil insulating system which is not only good in application manufacturability, but also good in heat conductivity and long in service life, is particularly suitable for a high-voltage motor, and further discusses the scheme of the application.
According to some specific and preferred embodiments, a high voltage motor stator coil insulation system comprises a straight portion and an end portion; the straight line part comprises a plurality of copper coils 1 forming the stator coil, turn-to-turn insulation 2 respectively coated on the periphery of each copper coil 1, a main insulation layer 3 coated on the periphery of the turn-to-turn insulation 2, and a low-resistance anti-corona layer 4, a high-resistance anti-corona layer 5 and a polyester binding tape 6 sequentially coated on the periphery of the main insulation layer 3.
The end part comprises a plurality of copper coils 1 forming a stator coil, a stator coil lead 7 arranged in parallel with the copper coils 1, turn-to-turn insulation 2 respectively coated on the peripheral side of each copper coil 1 and the peripheral side of the stator coil lead 7, a polyester fiber blanket 8 coated on the peripheral side of the turn-to-turn insulation 2 on the stator coil lead 7, a main insulation layer 3 coated on the peripheral sides of the turn-to-turn insulation 2 and the polyester fiber blanket 8, and a polyester binding belt 6 coated on the peripheral side of the main insulation layer 3.
The main insulating layer 3 is formed by curing mica tapes and epoxy VPI resin; the preparation method of the epoxy VPI resin comprises the following steps:
(1) adding a certain amount of nano powder, a dispersant and epoxy resin into a high-speed homogeneous emulsification kettle, adjusting the rotating speed to 4000-;
(2) transferring the homogenized and emulsified material obtained in the step (1) into high-efficiency grinding equipment, grinding and dispersing until the average particle size of the nano powder is less than 80nm, filtering to obtain the epoxy VPI resin, introducing cooling water in the grinding process, and controlling the temperature of the material to be lower than 60 ℃.
The scheme of the invention has at least the following advantages:
(1) the insulating system of the stator coil of the high-voltage motor effectively improves the heat conducting performance and the heat radiating performance of the insulating system through the design of inter-turn insulation, a main insulating layer, a protective layer and the like, obviously reduces the temperature rise of the high-voltage motor, prolongs the service life of the high-voltage motor, and has better electric insulating performance and application manufacturability.
(2) The thermal conductivity of the conventional main insulating layer is about 0.20W/(m.K), and the thermal conductivity of the main insulating layer prepared by the method reaches 0.35-0.50W/(m.K), and can be improved by more than one time.
(3) The main insulating layer in the invention has simple preparation process and easily obtained raw materials, and the epoxy VPI resin with high heat conductivity can be obtained by only modifying the existing commercially available epoxy resin by using the nano powder and the dispersing agent, and has good application manufacturability and good infiltration effect.
(4) Compared with the high-voltage motor using the conventional insulation system, the temperature rise of the high-voltage motor using the insulation system can be reduced by about 10K, the dielectric loss and the local discharge energy are reduced by 20-40%, the electric performance and the electrothermal aging life of the high-voltage motor are improved, and the operation reliability of the high-voltage motor is further improved.
(5) The stator coil insulation system is suitable for high-voltage motors with the voltage of more than 6kV level, and meets the high-power operation requirement of the high-voltage motors.
The present invention will be further described with reference to the following examples. However, the present invention is not limited to the following examples. The implementation conditions adopted in the embodiments can be further adjusted according to different requirements of specific use, and the implementation conditions not mentioned are conventional conditions in the industry. The technical features according to the embodiments of the present invention may be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1, an insulation system of a high-voltage motor stator coil comprises a straight line part and an end part, wherein a schematic cross-sectional view of the straight line part is shown in fig. 2, the straight line part comprises a plurality of copper coils 1 forming the stator coil, turn-to-turn insulation 2 respectively coated on the outer periphery of each copper coil 1, a main insulation layer 3 coated on the outer periphery of the turn-to-turn insulation 2, and a low-resistance corona-proof layer 4, a high-resistance corona-proof layer 5 and a polyester binding tape 6 sequentially coated on the outer periphery of the main insulation layer 3.
Fig. 3 is a schematic cross-sectional view of an end portion, the end portion includes a plurality of copper coils 1 constituting a stator coil, a stator coil lead 7 disposed in parallel with the copper coils 1, inter-turn insulation 2 respectively covering an outer peripheral side of each of the copper coils 1 and an outer peripheral side of the stator coil lead 7, a polyester fiber blanket 8 covering an outer peripheral side of the inter-turn insulation 2 on the stator coil lead 7, a main insulation layer 3 covering an outer peripheral side of the inter-turn insulation 2 and the polyester fiber blanket 8, and a polyester binding tape 6 covering an outer peripheral side of the main insulation layer 3.
The turn-to-turn insulation 2 is formed by winding a 0.40-0.45 mm thick mica tape reinforced by a 0.06mm thick polyester film through two-layer half-lap winding, wherein the mica tape reinforced by the polyester film is a JF-5442-1D mica tape produced by Suzhou Kyoho electrical insulation systems GmbH.
The main insulating layer 3 is formed by wrapping high-thermal-conductivity mica tapes in a seven-layer half-lap mode, impregnating the mica tapes with high-thermal-conductivity epoxy VPI resin and then curing the mica tapes, wherein the curing temperature is 165 ℃ and the curing time is 12 hours; wherein the high-heat-conductivity mica tape is a 0.14 mm-thick glass cloth reinforced high-heat-conductivity low-resin mica tape produced by Suzhou Kyoho electrical insulation systems GmbH, and the model is JF-5442-1 HTC; the preparation method of the high-thermal-conductivity epoxy VPI resin comprises the following steps: (1) 3kg of aluminum oxide with the grain diameter of about 30nm, 2kg of silicon dioxide with the grain diameter of about 50nm, 0.25kg of BYK142 dispersant and 25kg of epoxy VPI resin (manufactured by Suzhou Kyoho electrical insulation System, Ltd.) with the trade name of JF-9956-3 are weighed and added into a high-speed homogenizing and emulsifying kettle, the rotating speed is adjusted to 5000r/min, homogenizing and emulsifying are carried out for 1.5h, cooling water is introduced in the process, and the temperature of the materials is controlled to be lower than 60 ℃. (2) And (2) transferring the product prepared in the step (1) into high-efficiency grinding equipment, grinding and dispersing until the average particle size of the nano particles is less than 80nm (cooling water is introduced in the process, the temperature of the material is controlled to be lower than 60 ℃), and filtering to obtain the high-thermal-conductivity epoxy VPI resin.
The low-resistance corona-proof layer 4 is formed by winding a layer of low-resistance corona-proof belt with the thickness of 0.08mm on the main insulating layer 3 at the linear part of the coil in a half-lap wrapping manner; wherein, the low-resistance corona-proof belt is a JF-CT low-resistance corona-proof belt produced by Suzhou Kyoho electrical insulation systems GmbH.
The high-resistance corona-proof layer 5 is formed by winding a high-resistance corona-proof belt with the thickness of 0.14mm in a half-lap mode from the end part of the low-resistance corona-proof layer 4 to the end part of the stator coil; wherein, the high-resistance corona-proof belt is a JF-SC high-resistance corona-proof belt produced by Suzhou Kyoho electrical insulation systems GmbH.
The polyester fiber sleeve felt 8 is sleeved on the outer peripheral side of the stator coil lead 7, so that the root of the stator coil lead 7 is more tightly attached to the end part of the stator coil, and air gap discharge caused by gaps in the running process of the motor is prevented; among them, the polyester fiber blanket 8 is commercially available.
After the high-resistance corona-proof layer 5 at the straight line part and the main insulating layer 3 at the end part of the polyester binding band 6 are wound, a layer of polyester binding band 6 is wound on the outer peripheral side, and after the stator coil is impregnated by vacuum pressure, the polyester binding band 6 can tightly lock impregnating resin between the high-resistance corona-proof layer 5 and the inter-turn insulation 2 and between the polyester binding band 6 and the inter-turn insulation 2 and between the polyester fiber blanket 8, so that the resin loss is reduced, and the stability of the motor can be enhanced; the polyester binding belt 6 is purchased from Xinmao electrical materials Co., Ltd, Nanyang, the model is YF0502, and the specification is 0.2 × 25 mm.
Comparative example 1
The difference from embodiment 1 is a main insulating layer 3.
The main insulating layer 3 in the comparative example is formed by wrapping high-thermal-conductivity mica tapes in a seven-layer half-lap mode, impregnating the mica tapes with nano particle modified vacuum pressure impregnating resin and then curing the impregnated mica tapes; wherein the high-heat-conductivity mica tape is a 0.14 mm-thick glass cloth reinforced high-heat-conductivity dry mica tape produced by Suzhou Kyoho electrical insulation systems GmbH, and the model is JF-5442-1 HTC; the preparation method of the nanoparticle modified vacuum pressure impregnation resin refers to ZL201210187846.1 example 3.
Comparative example 2
The difference from embodiment 1 is a main insulating layer 3.
The main insulating layer 3 in the comparative example is formed by performing seven-layer half-lap coating on a conventional commercially available 0.14mm glass cloth reinforcing dry mica tape and curing the glass cloth reinforcing dry mica tape by using commercially available epoxy VPI (vacuum pressure impregnation) resin; wherein the glass cloth reinforced little-glue mica is JF-5442-1T mica tape produced by Suzhou Kyoho electrical insulation systems GmbH; the epoxy VPI impregnating resin is JF-9956-3 epoxy VPI resin manufactured by Suzhou Kyoho electrical insulation systems GmbH.
Performance test
The high-voltage motor stator coil insulation systems in example 1 and comparative examples 1 and 2 were subjected to performance tests, and the results are shown in table 1; wherein, the test method of the thermal conductivity coefficient is based on GB/T29313-; the breakdown voltage strength and electrical aging life test method is based on JB/T12685 and 2016 mechanical industry Standard "technical conditions of stator coils of high-voltage motors"; the evaluation standard of application manufacturability is in accordance with GB/T15022.2017 resin-based active compound for electrical insulation part 2: test methods the viscosity increase times for storage stability were examined.
TABLE 1
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (11)
1. The utility model provides a high voltage motor stator coil insulation system which characterized in that: the high-voltage motor stator coil insulation system comprises a straight line part and an end part, wherein the straight line part and the end part respectively comprise a copper coil, an inter-turn insulation layer coated on the outer side of the copper coil, a main insulation layer coated on the outer side of the inter-turn insulation layer and a protective layer coated on the outer side of the main insulation layer;
the main insulating layer is formed by curing a mica tape and epoxy VPI resin, the epoxy VPI resin is prepared from nano powder, a dispersing agent and epoxy resin, and the raw materials of the epoxy VPI resin do not contain anhydride.
2. The high voltage motor stator coil insulation system of claim 1, wherein: the epoxy resin is selected from epoxy modified polyester imide impregnating resin; and/or the presence of a gas in the gas,
the nano powder is selected from one or more of boron nitride, aluminum oxide and aluminum nitride, and the particle size of the nano powder is 10-80 nm;
the dispersant is one or more selected from BYK142 dispersant, BYK110 dispersant, KH550 dispersant and KH560 dispersant; and/or the presence of a gas in the gas,
the epoxy resin: nano powder: the feeding mass ratio of the dispersing agent is 100: (15-25): (0.5 to 1.5).
3. The high voltage motor stator coil insulation system of claim 1 or 2, wherein: the mica tape is wrapped in a semi-lap wrapping mode, and the number of the wrapping layers is 5-9; and/or the presence of a gas in the gas,
the thickness of the mica tape is 0.1-0.2 mm, and the heat conductivity coefficient is not less than 0.4W/(m.K).
4. The high voltage motor stator coil insulation system of claim 1, wherein: the thermal conductivity coefficient of the main insulating layer is 0.35-0.5W/(m.K).
5. The high voltage motor stator coil insulation system of claim 1, wherein: the preparation method of the epoxy VPI resin comprises the steps of homogenizing and emulsifying the nano powder, the dispersing agent and the epoxy resin, and then grinding and dispersing; wherein the rotation speed of the homogeneous emulsification is controlled to be 4000-6000r/min, and the time is 1-2 h; controlling the temperature of the system material to be lower than 60 ℃ when the homogeneous emulsification and the grinding dispersion are carried out; grinding the nano particles dispersed in the system until the particle size of the nano particles is less than 80 nm.
6. The high voltage motor stator coil insulation system of claim 1, wherein: the turn-to-turn insulation is formed by wrapping 1-4 layers of polyester film reinforced mica tapes with the thickness of 0.03-0.09 mm in a half-lap wrapping manner; and/or the presence of a gas in the gas,
the thickness of the turn-to-turn insulation is 0.4-0.45 mm.
7. The high voltage motor stator coil insulation system of claim 1, wherein: the straight line portion is still including the cladding in proper order the corona layer is prevented to the low resistance in the main insulation layer outside, the corona layer is prevented to the high resistance, the protective layer sets up the outside on corona layer is prevented to the high resistance, the corona layer is prevented by the low resistance that thickness is 0.05~0.11mm and is prevented the corona belt through 1~2 layers of half-lap package around the package formation, the corona layer is prevented by the high resistance that thickness is 0.1~0.2mm and is prevented the corona belt through 1~2 layers of half-lap package around the package formation to the high resistance.
8. The high voltage motor stator coil insulation system of claim 1, wherein: the end part also comprises a stator coil lead wire arranged in parallel with the copper coil, the outer side of the stator coil lead wire is sequentially coated with the inter-turn insulation and the polyester fiber blanket, and the main insulation layer is arranged on the outer sides of the inter-turn insulation on the polyester fiber blanket and the copper coil.
9. The high voltage motor stator coil insulation system of claim 7 or 8, wherein: the protective layer is formed by wrapping polyester binding tapes.
10. The high voltage motor stator coil insulation system of claim 1, wherein: the high-voltage motor is a high-voltage motor with the voltage of more than 6kV level.
11. A method for preparing a stator coil insulation system of a high voltage motor according to any one of claims 1 to 10, characterized in that: the preparation method comprises the following preparation steps:
(1) winding polyester film reinforced mica tapes on a straight line part of the high-voltage motor stator coil, a copper coil at the end part and a stator coil lead at the end part to form inter-turn insulation;
(2) winding a mica tape on the outer side of the turn-to-turn insulation, impregnating the mica tape with epoxy VPI resin, and curing the impregnated mica tape and the epoxy VPI resin into a main insulation layer, wherein the epoxy VPI resin does not contain anhydride, and the preparation method of the epoxy VPI resin comprises the steps of homogenizing and emulsifying nano powder, a dispersing agent and the epoxy resin, and then grinding and dispersing; controlling the curing temperature to be 160-170 ℃ and the curing time to be 8-13 h;
(3) and winding a protective layer on the outer side of the main insulating layer.
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| CN202210853149.9A CN115118050A (en) | 2022-07-07 | 2022-07-07 | High-voltage motor stator coil insulation system and preparation method thereof |
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| CN202210853149.9A CN115118050A (en) | 2022-07-07 | 2022-07-07 | High-voltage motor stator coil insulation system and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116683682A (en) * | 2023-07-27 | 2023-09-01 | 北京金风科创风电设备有限公司 | Stator, generator, wind generating set and encapsulation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116683682A (en) * | 2023-07-27 | 2023-09-01 | 北京金风科创风电设备有限公司 | Stator, generator, wind generating set and encapsulation method |
| CN116683682B (en) * | 2023-07-27 | 2024-02-23 | 北京金风科创风电设备有限公司 | Stator, generator, wind generating set and encapsulation method |
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