VPI insulation process system of high-voltage stator coil thinning insulation structure

Abstract

The invention discloses a VPI insulation process system of a high-voltage stator coil thinning insulation structure, a VPI insulation process device comprises a transverse pressure control impregnation tank, and an impregnation bin is arranged in the pressure control impregnation tank; the impregnation device further comprises a supercharging device and an air exhaust negative pressure device, the supercharging device can charge dry air or inert gas into the impregnation bin to pressurize the impregnation bin, and the air exhaust negative pressure device can extract air in the impregnation bin to form vacuum negative pressure in the impregnation bin; the lower part of the dipping bin is a concave arc bottom, and the arc bottom in the dipping bin is a paint dipping pool in which liquid insulating paint is continuously stored; according to the scheme, the whole high-voltage stator coil does not need to be immersed in a paint dipping pool, the consumption of insulating paint is reduced, and waste is avoided.

Description

Technical Field

[0001] The present invention belongs to the field of high-voltage stator coil impregnation varnish. Background Art

[0002] The high-voltage stator coil adopts a reduced-insulation structure. On the one hand, it can reduce the volume of the motor and the manufacturing cost of the motor. More importantly, it can also improve the slot utilization rate. When there is a risk of current turn-to-turn breakdown, therefore, on the basis of the reduced-insulation structure, the high-voltage stator coil also needs to further implement the VPI insulation process. In the existing VPI insulation process, the high-voltage stator coil needs to be completely immersed in the insulation varnish, and the amount of insulation varnish used is large. When the number of batches produced at one time is small, a large amount of insulation varnish is still required, resulting in a large amount of consumption. Summary of the Invention

[0003] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides a VPI insulation process system for a high-voltage stator coil with a reduced-insulation structure. This solution does not require the entire high-voltage stator coil to be immersed in the impregnation tank, reducing the amount of insulation varnish used and avoiding waste.

[0004] Technical Solution: To achieve the above object, the VPI insulation process system for a high-voltage stator coil with a reduced-insulation structure of the present invention, the VPI insulation process device includes a horizontal pressure-controlled impregnation tank, and the inside of the pressure-controlled impregnation tank is an impregnation chamber; it also includes a pressurizing device and a vacuum pumping device. The pressurizing device can fill the impregnation chamber with dry air or inert gas to increase the pressure in the impregnation chamber, and the vacuum pumping device can extract the air in the impregnation chamber to form a vacuum negative pressure in the impregnation chamber; the lower part of the impregnation chamber is a concave arc bottom, and the arc bottom in the impregnation chamber is an impregnation tank filled with liquid insulation varnish.

[0005] Further, the vacuum degree when the impregnation chamber is evacuated: 0.6 - 0.8 mbar; the surface pressure of the workpiece during pressurization: 7 kg / cm2.

[0006] Further, one side of the pressure-controlled impregnation tank is provided with a sealable and openable seal chamber door through a hinge, and a chamber door locking device is provided on the seal chamber door; in the non-impregnation state, the hinge of the seal chamber door is higher than the liquid level of the impregnation tank.

[0007] Further, an a rotating shaft and a b rotating shaft are arranged in parallel up and down in the seal chamber door; when the high-voltage stator coil is horizontally loaded into the impregnation chamber with its axis horizontal, both the a rotating shaft and the b rotating shaft are within the range enclosed by the annular stator core of the high-voltage stator coil.

[0008] Further, the ends of the a rotating shaft and the b rotating shaft away from the seal chamber door are respectively rotationally fitted through sealed bearings with bearing holes on the wall of one end of the pressure-controlled impregnation tank; it also includes a driving device that can respectively drive the a rotating shaft and the b rotating shaft.

[0009] Further, a number of iron core supporting wheels are fixedly arranged coaxially and equidistantly on the a rotating shaft, and the outer peripheral surface of the iron core supporting wheels is a rubber wheel surface; an annular pre-rolling groove is formed between any two adjacent iron core supporting wheels;

[0010] A number of winding discs are fixedly arranged coaxially and equidistantly on the b rotating shaft, and the a number of winding discs are respectively located directly below a number of annular pre-rolling grooves; a tape roll is wound on each winding disc, and the end of the tape led out upward from the tape roll of the winding disc is fixedly connected to the bottom of the corresponding annular pre-rolling groove above;

[0011] When the elastic outer wheel surfaces of a number of iron core supporting wheels jointly support the upper end of the inner ring of the annular stator core of the high-voltage stator coil upward, the lower end of the supported high-voltage stator coil is immersed in the dipping paint pool. When a number of iron core supporting wheels rotate synchronously along their own axes, under the drive of rolling friction and the constraint of the self-gravity of the high-voltage stator coil, the high-voltage stator coil rotates along its own axis;

[0012] Further, in step one, the high-voltage stator coil to be dipped with paint that has been pre-baked and dehumidified is horizontally loaded into the impregnation chamber in a horizontal axis posture, and the elastic outer wheel surfaces of a number of iron core supporting wheels jointly support the upper end of the inner ring of the annular stator core of the high-voltage stator coil upward, and the lower end of the supported high-voltage stator coil just dips into the dipping paint pool;

[0013] In step two, close the sealed chamber door, and the air extraction negative pressure device extracts the air in the impregnation chamber to form a vacuum negative pressure in the impregnation chamber;

[0014] In step three, on the basis of maintaining the vacuum negative pressure in the impregnation chamber, actively control the a rotating shaft to slowly rotate counterclockwise, and the b rotating shaft rotates passively with adaptive damping; when any part of the high-voltage stator coil has dipped into the dipping paint pool, immediately control the air extraction negative pressure device to pause, and control the pressurization device to fill the impregnation chamber with dry air or inert gas to increase the pressure in the impregnation chamber;

[0015] Meanwhile, the tapes led out upward from the tape rolls of each winding disc will gradually wind counterclockwise into the corresponding annular pre-rolling grooves, and at the end of this step, each annular pre-rolling groove is just completely filled;

[0016] In step four, on the basis of "step three", the a rotating shaft continues to rotate counterclockwise, and the b rotating shaft continues to rotate passively with adaptive damping; gradually formed outside each annular pre-rolling groove are supporting winding bodies with an outer diameter gradually increasing and an outer diameter greater than that of the iron core supporting wheels. The a number of supporting winding bodies with gradually increasing outer diameters begin to "replace" the iron core supporting wheels and jointly support the upper end of the inner ring of the annular stator core of the high-voltage stator coil upward. During the process of rotating along the axis, the high-voltage stator coil also gradually moves upward, so that the lower end of the high-voltage stator coil gradually moves upward away from the liquid surface of the dipping paint pool;

[0017] After the lower end of the high-voltage stator coil is separated from the liquid level of the dipping paint tank, the excess liquid insulating paint on the surface of the high-voltage stator coil drips under the action of gravity. After the lower end of the high-voltage stator coil is separated from the liquid level of the dipping paint tank, the high-voltage stator coil is still rotating. Therefore, the excess liquid insulating paint on the surface of the high-voltage stator coil can drip more smoothly and efficiently under the action of gravity and rotational centrifugal force, thereby shortening the dripping time of the excess liquid insulating paint and improving the efficiency. After the dripping process is completed, the rotation of the a-axis is paused;

[0018] Step Five: Open the sealed chamber door, take out the high-voltage stator coil that has been fully dipped in paint and dripped off the excess paint, and perform drying and curing treatment on the impregnated high-voltage stator coil to make it take shape and fix the impregnating liquid;

[0019] Step Six: Control the rotation of the a-axis and the b-axis respectively to return the device to its initial position and wait for the next VPI insulation process.

[0020] Beneficial effects: The dipping process of the present invention does not require the entire high-voltage stator coil to be immersed in the dipping paint tank, reducing the amount of insulating paint used and avoiding waste. At the same time, the pressure paint discharge process is also omitted. Description of the Drawings

[0021] Figure 1 It is an overall schematic diagram when opening the lid of the pressure control impregnation tank;

[0022] Figure 2 It is a schematic diagram when the lower end of the high-voltage stator coil held in "Step One" just dips into the dipping paint tank;

[0023] Figure 3 It is a schematic diagram after the lower end of the high-voltage stator coil in "Step Four" moves upward and separates from the liquid level of the dipping paint tank;

[0024] Figure 4 For " Figure 2 " state, the exploded view along the axis direction, hiding the pressure control impregnation tank;

[0025] Figure 5 For " Figure 3 " state, the exploded view along the axis direction, hiding the pressure control impregnation tank;

[0026] Figure 6 It is a VPI insulation process flow chart. Detailed Embodiments

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] The high-voltage stator coil 12 in this case is semi-overlapped and wrapped with 7 layers of 5442-1D(G) glass cloth-reinforced mica with less resin and 5442-1D(P) film-reinforced mica tape with less resin. The double-sided insulation thickness is 3.64 mm. The manufacturer of the mica tape is Jufeng Co., Ltd., with less resin tapes 5442-1 and S5442-1P. The wire gauge is in accordance with the drawing requirements. The coil wrapping requires being flat and fitting. Mica pads are arranged for interlayer insulation so that the two rows of conductors of the coil can be tightly bonded together during curing. It is operated by skilled employees, with the dimensions meeting the requirements. The dimensions of each coil are measured and numbered and recorded. The winding, bulging, shaping, and inter-turn gelling are carried out according to the current process. This uses Jufeng JF-9965 insulating paint for impregnation.

[0029] Important parameters of the VPI insulation process:

[0030] Coil preheating: 105 ± 5 °C

[0031] Vacuum pumping: Vacuum degree: 0.6 - 0.8 mbar

[0032] Pressurized impregnation: Pressure: 7 kg / cm2

[0033] Drying: 160 - 170 °C;

[0034] The specific process system is as follows:

[0035] Introduction to the process system, as Figures 1 to 6 shown:

[0036] The high-voltage stator coil 12 includes an annular stator core 8, and a wire coil 6 with a surface thinning insulation process is wound on the annular stator core 8; it includes a VPI insulation process device. The VPI insulation process device includes a horizontal pressure control impregnation tank 9, and the inside of the pressure control impregnation tank 9 is an impregnation chamber 1; it also includes a pressurizing device and a vacuum pumping negative pressure device. The pressurizing device can fill the impregnation chamber 1 with dry air or inert gas to increase the pressure of the impregnation chamber 1, and the vacuum pumping negative pressure device can extract the air in the impregnation chamber 1 to form a vacuum negative pressure in the impregnation chamber 1.

[0037] The lower part of the impregnation chamber 1 is a concave arc bottom, and the arc bottom inside the impregnation chamber 1 is an impregnation pool 5 for storing liquid insulating paint; one side of the pressure control impregnation tank 9 is provided with a sealable and openable sealable hatch door 14 through a hinge 15, and a hatch locking device is provided on the sealable hatch door 14; in the non-impregnation state, the hinge 15 of the sealable hatch door 14 is higher than the liquid level of the impregnation pool 5, so that the liquid insulating paint stored in the impregnation pool 5 will not overflow when the sealable hatch door 14 is in the open state; one of the features of this solution is that it is not necessary to immerse the entire high-voltage stator coil 12 into the impregnation pool 5, reducing the usage amount of the insulating paint and avoiding waste.

[0038] There are a rotating shaft 2 and a b rotating shaft 4 arranged in parallel up and down in the sealed bin door 14; when the high-voltage stator coil 12 is horizontally loaded into the impregnation bin 1 with its axis horizontal, both the a rotating shaft 2 and the b rotating shaft 4 are within the range enclosed by the annular stator core 8 of the high-voltage stator coil 12.

[0039] One end of the a rotating shaft 2 and the b rotating shaft 4 far from the sealed bin door 14 are respectively rotationally fitted through sealed bearings with bearing holes on the wall of one end of the pressure control impregnation tank 9; there is also a driving device capable of respectively driving the a rotating shaft 2 and the b rotating shaft 4, such as a driving motor; a plurality of iron core supporting wheels 10 are coaxially and equidistantly fixedly arranged on the a rotating shaft 2, and the outer peripheral surface of the iron core supporting wheels 10 is a rubber wheel surface; an annular pre-rolling groove 30 is formed between any two adjacent iron core supporting wheels 10.

[0040] A plurality of winding discs 3 are coaxially and equidistantly fixedly arranged on the b rotating shaft 4, and the plurality of winding discs 3 are respectively corresponding to directly below the plurality of annular pre-rolling grooves 30; a tape coil 20 is wound on each winding disc 3, and the end of the tape body 7 led out upward from the tape coil 20 of the winding disc 3 is fixedly connected to the bottom of the corresponding annular pre-rolling groove 30 above; the tape body 7 in this case is a high-strength metal woven tape with a certain thickness. When the elastic outer wheel surfaces of a plurality of iron core supporting wheels 10 jointly support the upper end of the inner ring of the annular stator core 8 of the high-voltage stator coil 12 upward, the lower end of the supported high-voltage stator coil 12 is immersed in the paint dipping pool 5. When a plurality of iron core supporting wheels 10 rotate synchronously along their own axes, under the drive of the rolling friction force and the restraint of the self-gravity of the high-voltage stator coil 12, the high-voltage stator coil 12 rotates along its own axis.

[0041] VPI insulation process:

[0042] Step 1: Open the sealed bin door 14, inject a certain amount of liquid insulating paint into the paint dipping pool 5 at the arc bottom in the impregnation bin 1, and then horizontally load the pre-baked and dehumidified high-voltage stator coil 12 to be impregnated into the impregnation bin 1 with its axis horizontal through a manipulator or transfer tool, and make the elastic outer wheel surfaces of a plurality of iron core supporting wheels 10 jointly support the upper end of the inner ring of the annular stator core 8 of the high-voltage stator coil 12 upward, and the lower end of the supported high-voltage stator coil 12 just immerses in the paint dipping pool 5, as Figure 2 shown;

[0043] Step 2: Close the sealed bin door 14, make the impregnation bin 1 enter a sealed state, and the air extraction negative pressure device extracts the air in the impregnation bin 1 to form a vacuum negative pressure in the impregnation bin 1, and extracts the air and volatiles inside the high-voltage stator coil 12 to be impregnated.

[0044] Step 3: On the basis of maintaining the vacuum negative pressure in the impregnation chamber 1, actively control the a-rotating shaft 2 to slowly rotate counterclockwise, and the b-rotating shaft 4 adaptively rotates with passive damping; a number of iron core supporting wheels 10 synchronously rotate counterclockwise along their own axes. Driven by the rolling friction and restricted by the self-gravity of the high-voltage stator coil 12, the high-voltage stator coil 12 supported by a number of iron core supporting wheels 10 rotates along its own axis; since the lower end of the supported high-voltage stator coil 12 is immersed in the impregnating paint tank 5, during the process of the high-voltage stator coil 12 rotating along its own axis, any local part of itself will gradually be immersed in the impregnating paint tank 5. When the high-voltage stator coil 12 rotates one full circle along its own axis, any position of the high-voltage stator coil 12 is completely immersed in the impregnating paint tank 5 once. Due to the effect of the vacuum environment, the insulating paint liquid quickly penetrates and fills the inside of the high-voltage stator coil 12;

[0045] Meanwhile, during the process that the a-rotating shaft 2 slowly rotates counterclockwise and the b-rotating shaft 4 adaptively rotates with passive damping in the above process, the tape 7 led out upward from the tape reel 20 of each tape reel 3 will gradually be wound counterclockwise into the corresponding annular pre-winding groove 30, so that each annular pre-winding groove 30 is gradually filled with the wound tape 7, and the groove depth of each annular pre-winding groove 30 gradually becomes shallower until each annular pre-winding groove 30 is just completely filled at the end of this step; therefore, in this stage, although each annular pre-winding groove 30 is gradually filled with the wound tape 7, since each annular pre-winding groove 30 is not completely filled before the end of this step, the elastic outer wheel surfaces of a number of iron core supporting wheels 10 at a fixed height are always in the state of upwardly supporting the upper inner ring of the annular stator core 8 of the high-voltage stator coil 12 in this stage, so that the supported high-voltage stator coil 12 maintains a constant height during the process of rotating along its own axis in this stage, thus ensuring that the lower end of the high-voltage stator coil 12 supported during the process of rotating along its own axis in this stage is always immersed in the impregnating paint tank 5, so as to fully ensure that any part of the high-voltage stator coil 12 can be orderly immersed in the impregnating paint tank 5 at the end of this step. When any part of the high-voltage stator coil 12 has been immersed in the impregnating paint tank 5, immediately control the air extraction negative pressure device to pause, and control the pressurizing device to fill the impregnation chamber 1 with dry air or inert gas to increase the pressure in the impregnation chamber 1. The liquid insulating paint impregnated on the high-voltage stator coil 12 further promotes the penetration of the paint liquid under the external pressure, ensuring that the paint liquid can completely fill every tiny gap inside the high-voltage stator coil 12. Thus, the impregnation process is completed;

[0046] Step 4: On the basis of "Step 3", the a-rotating shaft 2 continues to rotate counterclockwise, and the b-rotating shaft 4 continues to rotate passively with adaptive damping; since each annular pre-winding groove 30 is just completely filled with the wound tape 7 at the end of "Step 3", the continuous counterclockwise rotation of the a-rotating shaft 2 will cause each annular pre-winding groove 30 filled with the wound tape 7 to continue to wind the tape 7 counterclockwise, so that a supporting winding body 21 with an outer diameter gradually increasing and larger than that of the iron core supporting wheel 10 is gradually formed outside each annular pre-winding groove 30. Since the outer diameter of each supporting winding body 21 is larger than that of the iron core supporting wheel 10, a number of supporting winding bodies 21 with gradually increasing outer diameters begin to "replace" the iron core supporting wheel 10 and jointly hold up the upper end of the inner ring of the annular stator core 8 of the high-voltage stator coil 12 upward. Since the outer diameter of the supporting winding body 21 gradually increases, the high-voltage stator coil 12 also gradually moves upward during the rotation along the axis, so that the lower end of the high-voltage stator coil 12 gradually moves upward away from the liquid level of the dipping tank 5, as Figure 3 shown;

[0047] After the lower end of the high-voltage stator coil 12 moves away from the liquid level of the dipping tank 5, the excess liquid insulating paint on the surface of the high-voltage stator coil 12 drips under the action of gravity. After the lower end of the high-voltage stator coil 12 moves away from the liquid level of the dipping tank 5, the high-voltage stator coil 12 is still rotating. Therefore, the excess liquid insulating paint on the surface of the high-voltage stator coil 12 can drip more smoothly and efficiently under the action of gravity and rotational centrifugal force, thus shortening the dripping time of the excess liquid insulating paint and improving the efficiency; after the dripping process ends, the rotation of the a-rotating shaft 2 is paused;

[0048] Step 5: Open the sealed chamber door 14, take out the high-voltage stator coil 12 that has been fully dipped and had the excess paint dripped off by a manipulator or tool, and perform a drying and curing treatment on the impregnated high-voltage stator coil 12 to form and fix the impregnating liquid;

[0049] Step 6: Control the rotation of the a-rotating shaft 2 and the b-rotating shaft 4 respectively to return the device to the initial position and wait for the next VPI insulation process.

[0050] Sampling inspection:

[0051] Bake and cure the sampled high-voltage stator coil 12 that has been dipped and dried, then saw off the coil, and observe the impregnation permeability of its cross-section and the filling state of the VPI impregnating paint. The inter-turn insulation of the coil electromagnetic wire made of mica-wrapped flat copper wire and its gaps in the cross-section of the coil are all filled with VPI resin without leaving any air gaps, indicating that the impregnation permeability of the inter-turn insulation after VPI dipping is very good.

[0052] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. VPI insulation process system for high voltage stator coil thinning insulation structure, characterized by: The VPI insulation process device comprises a horizontal pressure-controlled impregnation tank (9), wherein the pressure-controlled impregnation tank (9) contains an impregnation chamber (1); further comprising a pressurizing device and an exhaust negative pressure device, wherein the pressurizing device can fill the impregnation chamber (1) with dry air or inert gas to increase the pressure of the impregnation chamber (1), and the exhaust negative pressure device can extract air from the impregnation chamber (1) to form a vacuum negative pressure in the impregnation chamber (1); The lower part of the impregnation bin (1) is a concave arc bottom, and the arc bottom inside the impregnation bin (1) is a paint immersion pool (5) in which liquid insulating paint continues to be stored.

2. The VPI insulation process system of the high-voltage stator coil thinning insulation structure according to claim 1 is characterized in that: The vacuum degree in the impregnation chamber (1) when evacuating is 0.6-0.8 mbar; the surface pressure of the workpiece when pressurizing is 7 kg / cm2.

3. The VPI insulation process system of the high voltage stator coil thinning insulation structure according to claim 1 is characterized in that: A sealed door (14) capable of sealing and opening is provided on one side of the pressure-controlled dipping tank (9) via a hinge (15), and a door locking device is provided on the sealed door (14); in a non-dipping state, the hinge (15) of the sealed door (14) is higher than the liquid level of the dipping tank (5).

4. The VPI insulation process system of the high-voltage stator coil thinning insulation structure according to claim 3 is characterized in that: A rotating shaft a (2) and a rotating shaft b (4) are arranged in parallel in the upper and lower parts of the sealed chamber door (14); when the high-voltage stator coil (12) is transversely loaded into the impregnation chamber (1) with its axis horizontal, the rotating shaft a (2) and the rotating shaft b (4) are both within the enclosure of the annular columnar stator core (8) of the high-voltage stator coil (12).

5. The VPI insulation process system of the high voltage stator coil thinning insulation structure according to claim 4 is characterized in that: The ends of the a rotating shaft (2) and the b rotating shaft (4) away from the sealed chamber door (14) are respectively rotated through sealed bearings to cooperate with the bearing holes on the wall of one end of the pressure control immersion tank (9); and a driving device capable of driving the a rotating shaft (2) and the b rotating shaft (4) respectively is also included.

6. The VPI insulation process system of the high voltage stator coil thinning insulation structure according to claim 5, characterized in that: A plurality of core support wheels (10) are fixedly arranged coaxially and equidistantly on the a-rotating shaft (2), and the outer peripheral surface of the core support wheel (10) is a rubber wheel surface; an annular pre-rolling groove (30) is formed between any two adjacent core support wheels (10); A plurality of tape reels (3) are fixedly arranged coaxially and equidistantly on the b-rotating shaft (4), and the plurality of tape reels (3) correspond to the positions directly below the plurality of annular pre-roll grooves (30) respectively; a tape reel (20) is wound on each tape reel (3), and the end of the tape body (7) led upward from the tape reel (20) of the tape reel (3) is fixedly connected to the bottom of the corresponding annular pre-roll groove (30) above; When the elastic outer wheel surfaces of a plurality of core supporting wheels (10) jointly support the upper end of the inner ring of the annular columnar stator core (8) of the high-voltage stator coil (12), the lower end of the supported high-voltage stator coil (12) is immersed in the paint immersion pool (5). When the plurality of core supporting wheels (10) rotate synchronously along their own axes, the high-voltage stator coil (12) rotates along its own axis under the drive of rolling friction and the constraint of the high-voltage stator coil (12)'s own weight.

7. The VPI insulation process system of the high voltage stator coil thinning insulation structure according to claim 6, characterized in that: Step 1: The pre-baked and dehumidified high-voltage stator coil (12) to be dipped in paint is placed horizontally in the dipping chamber (1) with its axis horizontal, and the elastic outer surfaces of a plurality of core supporting wheels (10) are used to support the upper end of the inner ring of the annular columnar stator core (8) of the high-voltage stator coil (12) upward, so that the lower end of the supported high-voltage stator coil (12) is just immersed in the dip painting pool (5); Step 2: closing the sealed chamber door (14), and using a vacuum negative pressure device to extract air from the impregnation chamber (1), so that a vacuum negative pressure is formed in the impregnation chamber (1); Step three, on the basis of maintaining the vacuum negative pressure in the impregnation chamber (1), actively control the a rotating shaft (2) to rotate slowly counterclockwise, and the b rotating shaft (4) to rotate adaptively with passive damping; when any part of the high-voltage stator coil (12) is immersed in the paint dip tank (5), immediately control the vacuum suction device to pause, and control the boosting device to fill the impregnation chamber (1) with dry air or inert gas to increase the pressure of the impregnation chamber (1); At the same time, the tape body (7) led upward from the tape roll (20) of each tape reel (3) is gradually wound into the corresponding annular pre-roll groove (30) in a counterclockwise direction. At the end of this step, each annular pre-roll groove (30) is completely filled. Step 4, on the basis of "Step 3", the a-rotating shaft (2) continues to rotate counterclockwise, and the b-rotating shaft (4) continues to rotate with adaptive passive damping; a supporting winding body (21) with a gradually increasing outer diameter and an outer diameter greater than the core supporting wheel (10) is gradually formed outside each annular pre-rolling groove (30), and a plurality of supporting winding bodies (21) with gradually increasing outer diameters begin to "replace" the core supporting wheel (10), and together support the upper end of the inner ring of the annular columnar stator core (8) of the high-voltage stator coil (12) upward, and the high-voltage stator coil (12) is gradually displaced upward during the process of rotating along the axis, so that the lower end of the high-voltage stator coil (12) gradually separates upward from the liquid surface of the varnish immersion pool (5); After the lower end of the high-voltage stator coil (12) is separated from the liquid surface of the varnish immersion pool (5), the excess liquid insulating paint on the surface of the high-voltage stator coil (12) drips down under the action of gravity. After the lower end of the high-voltage stator coil (12) is separated from the liquid surface of the varnish immersion pool (5), the high-voltage stator coil (12) is still rotating. Therefore, the excess liquid insulating paint on the surface of the high-voltage stator coil (12) can drip down more smoothly and efficiently under the action of gravity and rotating centrifugal force, thereby shortening the dripping time of the excess liquid insulating paint and improving efficiency. After the dripping process is completed, the rotation of the a rotating shaft (2) is suspended; Step 5, opening the sealed compartment door (14), taking out the high-voltage stator coil (12) that has been fully dipped in paint and dripped with excess paint, and drying and curing the dipped high-voltage stator coil (12) to shape it and fix the dip liquid; Step six, respectively controlling the rotation of the a-shaft (2) and the b-shaft (4) to restore the device to its initial position and wait for the next VPI insulation process.

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