A split impregnation system and impregnation method for the stator winding of a permanent magnet synchronous motor

Abstract

The present invention discloses a split varnishing system and a varnishing method for a stator winding of a permanent magnet synchronous motor. It mainly includes a varnishing frame, modular stator windings, coil pressing plates, varnishing equipment and liquid level sensors. The entire stator winding is divided into several modular stator windings along the circumferential direction, and the coil pressing plates are installed on both sides of the modular stator windings. According to a specific sequence, the modular stator windings with coil pressing plates are installed on the varnishing frame. The varnishing frame includes square tubes, longitudinal channel steels, transverse channel steels, angle irons and lifting plates, etc., and through holes are provided thereon for installing the modular stator windings. After varnishing is completed, it is disassembled in the reverse order and assembled into the entire stator winding. The structure of the present invention is simple, the operation is convenient, the layout is compact, the production cost is low, while improving the utilization rate of the internal space of the varnishing equipment, it ensures that there is no contact between adjacent modular stator windings, avoids the mutual adhesion of winding coils, and has a good varnishing effect.

Description

Technical Field

[0001] The present invention belongs to the field of manufacturing of motor stator windings, and particularly relates to a split impregnation system and an impregnation method for a permanent magnet synchronous motor stator winding. Background Technique

[0002] The insulation impregnation treatment of the motor stator winding is a very important link in the process of manufacturing the motor stator. Its purpose is to fully fill the gaps inside the winding and the insulation with insulating paint, so that each component in the entire winding insulation structure is bonded into a whole, and a dense, smooth, complete and continuous paint film is formed on the surface of the winding. After the motor stator winding is impregnated, the electrical, mechanical and other protection performances of the stator winding are improved. The quality of the impregnation directly affects the temperature rise and service life of the motor.

[0003] In the prior art, most of the sizes of the impregnation equipment are fixed values, resulting in limited sizes of the stator windings during impregnation. When the cross-sectional size of the stator winding to be impregnated is larger than the size of the impregnation equipment, it is impossible to first assemble the stator winding and then impregnate the whole stator. Instead, each modular stator winding needs to be impregnated first and then assembled into the whole stator winding. However, since the number that can be placed in the impregnation basket each time is limited, if the modular stator windings are stacked, it is easy for the winding coils to stick to each other, causing damage to the winding coils and affecting the impregnation effect. Moreover, when the modular stator winding is placed in the impregnation basket and then hoisted into the impregnation equipment, it is very difficult to ensure the force balance of the impregnation basket. If the impregnation basket is skewed due to unbalanced force, it is easy to make the paint film on the outer surface of the modular stator winding uneven during impregnation, resulting in paint tumors, which not only affect the assembly accuracy but also need to be removed manually, reducing the assembly efficiency.

[0004] To solve this problem in the prior art, the present invention provides a split impregnation system and an impregnation method for a permanent magnet synchronous motor stator winding, impregnating the modular stator windings and then assembling them into the whole stator winding. Summary of the Invention

[0005] The purpose of the present invention is to provide a split impregnation system and an impregnation method for a permanent magnet synchronous motor stator winding to solve the problems raised in the above background technique.

[0006] To achieve the above object, according to one aspect of the present invention, a split dipping system for a permanent magnet synchronous motor stator winding is provided; it includes a dipping frame 1, a modular stator winding 2, a coil pressing plate 3, a dipping device 4 and a liquid level sensor 5; wherein, the dipping frame 1 includes square tubes 101, longitudinal channel steels 102, transverse channel steels 103, angle irons 104, lifting plates 105 and bolts 106; wherein, the modular stator winding 2 includes stator tooth punching sheets 201, stator core fixing keys 202, stator core pressing plates 203, stator insulation end plates 204, winding coils 205 and lifting ring screws 206; wherein, the coil pressing plate 3 includes a pressing plate 301 and fasteners 302.

[0007] Further, the dipping frame 1 is a multi-layer square frame structure, and the four square tubes 101 are located at the four corners of the square frame structure and are vertically arranged; each layer of the square frame is jointly formed by the two longitudinal channel steels 102 and the two transverse channel steels 103 to form the four sides of the square frame.

[0008] Further, the longitudinal channel steels 102 and the transverse channel steels 103 have notches; the longitudinal channel steels 102 and the transverse channel steels 103 respectively have preset lengths; the notches of the longitudinal channel steels 102 and the transverse channel steels 103 are arranged downward, and the longitudinal channel steels 102 and the transverse channel steels 103 are fixed between the two square tubes 101 by welding.

[0009] Further, the dipping frame 1 is a two-layer square frame; each layer of the frame is formed by sequentially welding two longitudinal channel steels 102 and two transverse channel steels 103 on a plane to the four square tubes 101, thereby forming a square frame structure of one layer; another layer of square frame is arranged at a position perpendicular to this layer, and the other two longitudinal channel steels 102 and the other two transverse channel steels 103 are sequentially welded to the four square tubes 101.

[0010] Further, several angle irons 104 are arranged on each layer of the square frame; the angle irons 104 are parallel to the transverse channel steels 103 and are welded inside the longitudinal channel steels 102, and their length is the distance between the inner surfaces of the two longitudinal channel steels 102; after welding the angle irons 104, in one layer of the frame structure of the dipping frame 1, the gear spacing formed by the angle irons 104 should be larger than the width of the modular stator winding 2.

[0011] Further, several mounting holes are provided on the longitudinal channel steels 102, the transverse channel steels 103 and the angle irons 104 for installing bolts 106 to fix the modular stator winding 2 on the dipping frame 1; the lifting plates 105 are arranged at the four top corners of the dipping frame 1 for hoisting and transportation; a liquid level sensor 5 is arranged at the upper part of the dipping frame 1.

[0012] Further, the stator tooth punching sheet 201 is formed by segmentally laminating, snap-riveting, fastening, and welding a plurality of sector-shaped stator tooth punching sheets. A keyway is provided in the middle for passing through the stator core fixing key 202; the two side tooth parts of the stator tooth punching sheet 201 are used for winding the winding coil 205; mounting holes are provided on the side surface of the stator core fixing key 202 for passing through the bolts 106; threaded holes are further provided at both ends of the stator core fixing key 202 for mounting the lifting eye screws 206; the stator core pressing plate 203 is located at both ends of the stator tooth punching sheet 201 for pressing the stator tooth punching sheet 201; the stator insulating end plate 204 is located at both ends of the stator core pressing plate 203 for isolating the stator tooth punching sheets 201 and the winding coils 205 with different electric potentials.

[0013] Further, through holes are provided at the upper and lower ends of the pressing plate 301 for installing the fasteners 302; the fasteners 302 enable the coil pressing plate 3 to be closely attached to the winding coil 205 so as not to cause relative slippage.

[0014] Further, the impregnating frame 1 includes a total of eight regions, namely Region I, Region II, Region III, Region IV, Region V, Region VI, Region VII, and Region VIII; each region is used for installing the modular stator winding 2 onto the impregnating frame 1.

[0015] Among them, Region I, Region II, Region III, and Region IV are located inside the square frame structure, and Region V, Region VI, Region VII, and Region VIII are located outside each side of the square frame structure.

[0016] According to another aspect of the present invention, an impregnating method is proposed, including the following steps:

[0017] S1. Use two pressing plates 301 to press the winding coils 205 on both sides of the modular stator winding 2. The fasteners 302 respectively pass through the through holes at the upper and lower ends of the pressing plates 301, adjust the minimum inner distance between the two pressing plates 301, and use nuts to press and fix them. Finally, place them in the semi-finished winding area.

[0018] S2. Apply silicone grease to the mounting holes and mounting surfaces of the modular stator winding 2 to prevent the insulating paint from entering the mounting holes.

[0019] S3. Align the mounting holes of the modular stator winding 2 with the mounting holes on the impregnating frame in the order of Region I → Region II → Region III → Region IV → Region V → Region VI → Region VII → Region VIII, and screw in the bolts 106 to install the modular stator winding 2 on the impregnating frame 1.

[0020] S4. Lift the impregnating frame 1 with the installed stator winding into the oven for pre-drying and dehumidifying. The pre-drying temperature is 100 °C, and the pre-drying time is 2 h.

[0021] S5. After placing the liquid level sensor of the insulating paint on the dipping frame 1, vertically lift it into the dipping equipment 4 and place it on the placement platform inside the dipping tank of the dipping equipment 4. Press the power switch, close the tank lid until the green indicator light is on, turn on the vacuum pump, evacuate the dipping tank, open the paint supply valve, and let the insulating paint slowly flow into the dipping tank. During this process, constantly observe whether the liquid level height displayed by the liquid level sensor 5 has exceeded the top of the dipping frame 1 and reached the predetermined position.

[0022] S6. Perform dipping treatment on the modular stator winding 2.

[0023] S7. After the dipping treatment, perform drying treatment. After the drying treatment is completed, remove the modular stator winding 2 from the dipping frame 1 in the order of Zone VIII → Zone VII → Zone VI → Zone V → Zone IV → Zone III → Zone II → Zone I; and remove the coil pressing plates 3 on both sides, remove the residual silicone grease, use a spatula or polishing method to remove the unevenness on the mounting surface of the stator core, and perform threading back on the mounting threaded holes. Description of the Drawings

[0024] Figure 1 It is an overall assembly schematic diagram of a split dipping system for a permanent magnet synchronous motor stator winding proposed by the present invention.

[0025] Figure 2 It is a schematic diagram of the sequential numbering of the modular stator winding installation areas of a split dipping system for a permanent magnet synchronous motor stator winding proposed by the present invention.

[0026] Figure 3 It is a schematic diagram of the assembly of the modular stator winding and the dipping frame of a split dipping system for a permanent magnet synchronous motor stator winding proposed by the present invention.

[0027] Figure 4 It is a schematic diagram of the structure of the dipping frame of a split dipping system for a permanent magnet synchronous motor stator winding proposed by the present invention.

[0028] Figure 5 It is a schematic diagram of the structure of the modular stator winding with coil pressing plates of a split dipping system for a permanent magnet synchronous motor stator winding proposed by the present invention.

[0029] In the figure: 1. Dipping frame; 101. Square tube; 102. Longitudinal channel steel; 103. Transverse channel steel; 104. Angle iron; 105. Lifting plate; 106. Bolt; 2. Modular stator winding; 201. Stator tooth punching sheet; 202. Stator core fixing key; 203. Stator core pressing plate; 204. Stator insulation end plate; 205. Winding coil; 206. Lifting ring screw; 3. Coil pressing plate; 301. Pressing plate; 302. Fastener; 4. Dipping equipment; 5. Liquid level sensor. Detailed Embodiment

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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.

[0031] A split-type dipping system for a permanent magnet synchronous motor stator winding proposed by the present invention. Refer to Figure 1 , the split-type dipping system for the permanent magnet synchronous motor stator winding includes a dipping frame 1, a modular stator winding 2, a coil pressing plate 3, a dipping device 4, and a liquid level sensor 5.

[0032] Refer to Figure 3 and 4 , the dipping frame 1 includes square tubes 101, longitudinal channel steels 102, transverse channel steels 103, angle irons 104, lifting plates 105, and bolts 106.

[0033] Refer to Figure 5 , the modular stator winding 2 includes stator tooth punching sheets 201, stator core fixing keys 202, stator core pressing plates 203, stator insulation end plates 204, winding coils 205, and lifting ring screws 206.

[0034] The coil pressing plate 3 includes a pressing plate 301 and fasteners 302.

[0035] Refer to Figure 3 and 4 , the dipping frame 1 is a square frame structure. Four square tubes 101 are located at the four corners of the square frame structure and are vertically arranged, and serve as the four columns of the dipping frame 1. The dipping frame 1 is a multi-layer frame. Each layer of the frame is jointly formed by two of the longitudinal channel steels 102 and two of the transverse channel steels 103 as the four sides of the square frame of this layer.

[0036] The longitudinal channel steels 102 and the transverse channel steels 103 have notches. Preferably, the notches are U-shaped notches. The longitudinal channel steels 102 and the transverse channel steels 103 respectively have preset lengths. In the present invention, the longitudinal channel steels 102 and the transverse channel steels 103 have the same length. The notches of the longitudinal channel steels 102 and the transverse channel steels 103 face downward, and the longitudinal channel steels 102 and the transverse channel steels 103 are fixed between two square tubes 101 by welding.

[0037] Preferably, in the present invention, the impregnated paint frame 1 is a two-layer frame. That is, each layer of the frame is composed of two longitudinal channel steels 102 and two transverse channel steels 103 on a plane, which are sequentially welded to four square tubes 101 in turn, thus forming a square frame structure of one layer. Another square frame is arranged at a position perpendicular to this layer, and in the same way, another two longitudinal channel steels 102 and another two transverse channel steels 103 are sequentially welded to the four square tubes 101. After welding, it forms a double-layer frame structure together with the square tubes 101. The spacing between the longitudinal channel steels and transverse channel steels of the upper layer frame and those of the lower layer frame is determined according to the length of the modular stator winding 2, ensuring that there is still a certain distance from the bottom to the placement surface after the winding is installed in the impregnated paint frame 1.

[0038] Several angle irons 104 are arranged on each layer of the double-layer frame structure. The angle irons 104 are parallel to the transverse channel steel 103 and are welded inside the longitudinal channel steel 102, and its length is the distance between the inner surfaces of two longitudinal channel steels 102. The number of angle irons 104 on each layer of the double-layer frame structure can be determined according to the actual situation. In the present invention, two angle irons 104 are arranged on each layer of the double-layer frame structure. After welding the angle irons 104, in one layer of the frame structure of the impregnated paint frame 1, the gear spacing formed by the angle irons 104 should be slightly wider than the width of the modular stator winding 2 to avoid damaging the winding coil 205 during installation and disassembly.

[0039] Continue to refer to Figure 4 , a number of mounting holes are provided on the longitudinal channel steel 102, transverse channel steel 103 and angle iron 104 for installing bolts 106 to fix the modular stator winding 2 on the impregnated paint frame 1. The lifting plates 105 are arranged at the four top corners of the impregnated paint frame 1 for hoisting and transportation.

[0040] Continue to refer to Figure 3 , a liquid level sensor 5 is arranged on the upper part of the impregnated paint frame 1. Based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid, it is used to detect the height of the insulating paint liquid level.

[0041] Refer to Figure 5, the stator tooth punching sheet 201 is formed by segmentally laminating, snap-riveting, fastening, and welding a number of sector-shaped stator tooth punching sheets, with a keyway provided in the middle for passing through the stator core to fix the key 202; the two side tooth parts of the stator tooth punching sheet 201 are used for winding the winding coil 205. When the modular stator winding 2 is energized, an excitation magnetic field will be generated, exerting a force on the rotor located therein; the side surface of the stator core fixing key 202 is provided with mounting holes for passing through the bolts 106; the two ends of the stator core fixing key 202 are also provided with threaded holes for installing the lifting ring screws 206. The stator core pressing plate 203 is located at both ends of the stator tooth punching sheet 201 for pressing the stator tooth punching sheet 201. The stator insulating end plate 204 is located at both ends of the stator core pressing plate 203, having good electrical insulation performance and being used to isolate the stator tooth punching sheet 201 with different electric potentials from the winding coil 205.

[0042] See Figure 5 , the coil pressing plate 3 includes a pressing plate 301 and a fastener 302. Among them, through holes are provided at the upper and lower ends of the pressing plate 301 for installing the fastener 302. The fastener 302 enables the coil pressing plate 3 to be closely attached to the winding coil 205, so as not to have relative slippage. The fastener 302 includes a hexagon head bolt, a flat washer, a spring washer, and a nut.

[0043] See Figure 1 , the impregnating equipment 4 is a VPI vacuum pressure impregnating equipment. The modular stator winding 2 is placed into the impregnating equipment 4. After exhausting the air and volatiles inside the winding coil 205 in a vacuum environment, and then relying on the gravity of the paint liquid and the capillary action in the coil under vacuum conditions, vacuum impregnation enables the paint liquid to quickly penetrate into the modular stator winding, so that the paint liquid is evenly attached to the modular stator winding.

[0044] Next, the impregnating method of a split impregnating system for the stator winding of a permanent magnet synchronous motor proposed by the present invention will be described.

[0045] This impregnating method includes the following steps:

[0046] S1. Use two pressing plates 301 to press the winding coils 205 on both sides of the modular stator winding 2. The fasteners 302 respectively pass through the through holes at the upper and lower ends of the pressing plates 301, adjust the minimum inner distance between the two pressing plates 301, and use nuts to press and fix. Finally, place it in the semi-finished winding area.

[0047] S2. Apply silicone grease to the mounting holes and mounting surfaces of the modular stator winding 2 to prevent the insulating paint from entering the mounting holes.

[0048] S3. Align the mounting holes of the modular stator winding 2 with the mounting holes on the impregnating frame in the order of Region I → Region II → Region III → Region IV → Region V → Region VI → Region VII → Region VIII, and screw in the bolts 106 to mount the modular stator winding 2 on the impregnating frame 1.

[0049] S4. Lift the impregnating frame 1 with the mounted stator winding into the oven for pre-drying and dehumidifying. The pre-drying temperature is 100 °C and the pre-drying time is 2 h.

[0050] S5. After placing the liquid level sensor of the insulating paint on the impregnating frame 1, vertically lift it into the impregnating equipment 4 and place it on the placement platform in the impregnating tank of the impregnating equipment 4. Press the power switch, close the tank cover until the green indicator light is on, turn on the vacuum pump to evacuate the impregnating tank, open the paint supply valve, and let the insulating paint slowly flow into the impregnating tank. During this process, constantly observe whether the liquid level height shown by the liquid level sensor 5 has exceeded the top of the impregnating frame 1 and reached the predetermined position.

[0051] Preferably, when the impregnating tank is being filled with paint, observe whether the liquid level height has exceeded the top of the winding of the impregnating frame 1 by 500 mm. If the liquid level height has not exceeded the top of the winding by 500 mm, continue to inject the insulating paint until it exceeds the top of the winding by 500 mm.

[0052] S6. Perform impregnation treatment on the modular stator winding 2. After the impregnation treatment, the integrity should be good, without problems such as exposed copper wrinkling, bubble paint tumors, and non-drying stickiness.

[0053] S7. After the impregnation treatment, perform drying treatment. After the drying treatment is completed, remove the modular stator winding 2 from the impregnating frame 1 in the order of Region VIII → Region VII → Region VI → Region V → Region IV → Region III → Region II → Region I; and remove the coil pressing plates 3 on both sides, clean the residual silicone grease, use a spatula or polishing and grinding method to remove the unevenness on the mounting surface of the stator core, and perform wire threading treatment on the mounting threaded holes.

[0054] Among them, Region I, Region II, Region III, Region IV, Region V, Region VI, Region VII, and Region VIII are the regions formed after mounting the modular stator winding 2 on the impregnating frame 1. Among them, Region I, Region II, Region III, and Region IV are inside the square frame structure, and Region V, Region VI, Region VII, and Region VIII are outside each side of the square frame structure. See Figure 1 , these eight regions of Region I, Region II, Region III, Region IV, Region V, Region VI, Region VII, and Region VIII make full use of the internal space of the circular impregnating tank of the impregnating equipment 4, improving the space utilization rate of the impregnating equipment 4.

[0055] Adopting the solution proposed by the present invention can achieve the following technical effects:

[0056] In the present invention, the impregnated paint frame has a simple structure, low production cost, and convenient operation. First, the modular stator winding is installed on the impregnated paint frame and then impregnated. After the impregnation is completed, it is removed from the impregnated paint frame and assembled into the entire stator winding. Compared with impregnating the entire stator winding after it is assembled, it solves the problem that due to the high viscosity and poor fluidity of the insulating paint, it is difficult to impregnate all parts of the coil, resulting in the insulation between the electromagnetic wires of the coil not meeting the requirements.

[0057] In the present invention, it is mainly divided into a total of eight regions, namely Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅵ, Ⅶ, and Ⅷ, but it is not limited to this. For example, it can also be divided into four, five, or six regions. After the modular stator winding is installed on the impregnated paint frame in the order of Ⅰ→Ⅷ regions, the forces at each part are balanced and the overall structure is stable, making the modular stator winding have good integrity after impregnation, with a uniform and smooth paint film and no wrinkles.

[0058] In the present invention, the modular stator winding is vertically installed on the impregnated paint frame. The vertical impregnation method can reduce the influence on the internal tolerance of the stator winding and enable the paint liquid to be evenly attached to all directions of the modular stator winding, with high forming quality.

[0059] In the present invention, the cross-sectional dimension of the impregnated paint frame is the size of the largest square equivalent to the bottom of the impregnating equipment on the premise of ensuring that there is no interference between the whole and the surrounding of the impregnating equipment after assembling the modular stator winding. This improves the utilization rate of the equipment space. In a limited equipment space, batch impregnation treatment can be realized, which is simple and practical and improves production efficiency.

[0060] In the present invention, before impregnation, coil pressing plates are installed on both sides of the coils of each modular stator winding. While improving the space utilization rate, it makes a certain distance between adjacent stator windings, avoiding the phenomenon of mutual adhesion of the stator winding coils during the impregnation process and effectively protecting the stator winding coils.

[0061] In the present invention, the liquid level transmitter is a submersible liquid level sensor. Based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid, it uses the piezoresistive effect of a diffused silicon or ceramic sensitive element to convert the static pressure into an electrical signal. After temperature compensation and linear correction, it is converted into a 4-20mADC standard current signal for output. It has the advantages of simple structure, small volume, convenient installation, high sensitivity, corrosion resistance, and high positioning accuracy.

[0062] In the present invention, the modular stator winding becomes a complete whole after VPI vacuum pressure impregnation treatment, having good electrical, mechanical, moisture-proof performance, and thermal stability, shortening the impregnation cycle and having high production efficiency.

[0063] The above has described the solution of the present invention in detail. However, it is obvious that the described embodiments above are only some embodiments of the present invention, rather than all embodiments. The detailed description of the embodiments of the present invention provided above is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts belong to the scope of protection of the present invention.

Claims

1. A split varnishing system for the stator winding of a permanent magnet synchronous motor, characterized in that: The split-type impregnating varnish system for the stator winding of the permanent magnet synchronous motor comprises an impregnating varnish frame (1), a modular stator winding (2), a coil pressing plate (3), an impregnating varnish device (4) and a liquid level sensor (5); Among them, the impregnating varnish frame (1) is a multi-layer square frame structure, and four square tubes (101) are located at the four corners of the square frame structure and are vertically arranged; each layer of the square frame is composed of two longitudinal channel steels (102) and two transverse channel steels (103) which jointly form the four sides of the square frame; several angle irons (104) are arranged on each layer of the square frame; the angle irons (104) are parallel to the transverse channel steels (103) and are welded to the inner sides of the longitudinal channel steels (102); Lifting plates (105) are arranged at the four top corners of the impregnating varnish frame (1); several mounting holes are provided on the longitudinal channel steels (102), the transverse channel steels (103) and the angle irons (104) for mounting bolts (106); A keyway is arranged in the middle of the stator tooth punching sheet (201) of the stator winding (2), which is used for passing through the stator core fixing key (202); the two side tooth parts of the stator tooth punching sheet (201) are used for winding the winding coil (205); threaded holes are further arranged at both ends of the stator core fixing key (202) for mounting lifting ring screws (206); stator core pressing plates (203) are located at both ends of the stator tooth punching sheet (201); stator insulation end plates (204) are located at both ends of the stator core pressing plates (203); Among them, the coil pressing plate (3) comprises a pressing plate (301) and a fastener (302); through holes are arranged at the upper and lower ends of the pressing plate (301) for mounting the fastener (302); the fastener (302) enables the coil pressing plate (3) to be closely attached to the winding coil (205); Among them, the liquid level sensor (5) is arranged at the upper part of the impregnating varnish frame (1), and the height of the impregnating varnish frame (1) immersed in the insulating varnish liquid surface is read through an external display; 2. The split varnishing system for the stator winding of a permanent magnet synchronous motor according to claim 1, wherein: The longitudinal channel steels (102) and the transverse channel steels (103) have notches; the longitudinal channel steels (102) and the transverse channel steels (103) respectively have preset lengths; the notches of the longitudinal channel steels (102) and the transverse channel steels (103) are arranged downward, and the longitudinal channel steels (102) and the transverse channel steels (103) are fixed between the two square tubes (101) by welding; 3. The split-type impregnating varnish system for the stator winding of the permanent magnet synchronous motor according to claim 2, characterized in that: The impregnating varnish frame (1) is a two-layer square frame; each layer of the frame is formed by sequentially welding two longitudinal channel steels (102) and two transverse channel steels (103) on a plane to the four square tubes (101), thereby forming a square frame structure of one layer; another layer of square frame is arranged at a position perpendicular to this layer, and the other two longitudinal channel steels (102) and the other two transverse channel steels (103) are sequentially welded to the four square tubes (101).

4. The split-type impregnating varnish system for the stator winding of the permanent magnet synchronous motor according to claim 1, characterized in that: The length of the angle iron (104) is the distance between the inner surfaces of two longitudinal channel steels (102); after the angle iron (104) is welded, in one layer of the frame structure of the dip painting frame (1), the gear spacing formed by the angle iron (104) is larger than the width of the modular stator winding (2).

5. A split dip painting system for a permanent magnet synchronous motor stator winding as described in claim 4, characterized in that: The stator tooth punching sheet (201) is formed by segmentally laminating, riveting, fastening, and welding a plurality of sector-shaped stator tooth punching sheets; mounting holes are provided on the side surface of the stator core fixing key (202) for passing bolts (106); the stator core pressing plate (203) is used to press the stator tooth punching sheet (201); the stator insulating end plate (204) is used to isolate the stator tooth punching sheets (201) and winding coils (205) with different electric potentials.

6. A split dip painting system for a permanent magnet synchronous motor stator winding as described in claim 5, characterized in that: The dip painting frame (1) includes a total of eight regions, namely Region I, Region II, Region III, Region IV, Region V, Region VI, Region VII, and Region VIII; each region is used to install the modular stator winding (2) into the dip painting frame (1); Among them, Region I, Region II, Region III, and Region IV are located inside the square frame structure, and Region V, Region VI, Region VII, and Region VIII are located outside each side of the square frame structure.

7. A dip painting method, including the split dip painting system for a permanent magnet synchronous motor stator winding according to any one of claims 1-6; characterized in that: The dip painting method includes the following steps: S1. Use two pressing plates (301) to press the winding coils (205) on both sides of the modular stator winding (2), the fasteners (302) respectively pass through the through holes at the upper and lower ends of the pressing plates (301), adjust the minimum distance between the inner sides of the two pressing plates (301), and use nuts to press and fix, and finally place it in the semi-finished winding area; S2. Apply silicone grease to the mounting holes and mounting surfaces of the modular stator winding (2) to prevent insulating paint from entering the mounting holes; S3. In the order of Region I → Region II → Region III → Region IV → Region V → Region VI → Region VII → Region VIII, align the mounting holes of the modular stator winding (2) with the mounting holes on the dip painting frame, and screw in the bolts (106) to install the modular stator winding (2) on the dip painting frame (1); S4. Lift the dip painting frame (1) installed with the stator winding into the oven for pre-baking and dehumidifying, the pre-baking temperature is 100 °C, and the pre-baking time is 2 h; S5. After placing the liquid level sensor of the insulating paint on the dip painting frame (1), vertically lift it into the dip painting equipment (4), place it on the placement platform in the dip painting tank of the dip painting equipment (4), press the power switch, close the tank cover until the green indicator light is on, turn on the vacuum pump, evacuate the dip painting tank, open the paint supply valve, and let the insulating paint slowly flow into the dip painting tank. During this process, it is necessary to constantly observe whether the liquid level height displayed by the liquid level sensor (5) has exceeded the top of the dip painting frame (1) and reached the predetermined position; S6. Perform dip painting treatment on the modular stator winding (2); S7. After dip painting treatment, drying treatment is carried out. After the drying treatment is completed, the modular stator winding (2) is removed from the dip painting frame (1) in the order of area VIII → area VII → area VI → area V → area IV → area III → area II → area I; and the coil pressing plates (3) on both sides are removed, the residual silicone grease is removed, the unevenness of the mounting surface of the stator core is removed by using a spatula or by polishing and grinding, and the mounting threaded holes are rethreaded.

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