Permanent magnet motor stator paint dipping method and system

Abstract

The invention relates to a permanent magnet motor stator paint dipping method and system. The method comprises the following steps: S1, cleaning and drying a stator; s2, dipping the pretreated stator in an insulating paint material to form a primary paint layer; s3, the stator after paint dipping is heated and cured, so that the paint forms a firm paint layer on the surface of the stator; and S4, performing quality detection and sorting on the cured stator. The paint dipping device has the beneficial effects that through intelligent and automatic control and treatment, the paint dipping quality and the production efficiency are improved, the production cost is reduced, and the environmental pollution is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motor manufacturing, and in particular to a permanent magnet motor stator varnish dipping method and system. Background Art

[0002] Permanent magnet motors (PMMs) offer advantages such as high efficiency, energy saving, and compact size, making them widely used in industries such as industry, home appliances, and new energy. As the core component of a PMM motor, the stator's insulation and mechanical strength directly impact its performance and lifespan. Varnishing is a key step in stator manufacturing. Its purpose is to form a uniform, dense layer of insulating varnish on the stator winding surface, thereby improving the stator's insulation, moisture resistance, and mechanical strength.

[0003] In the existing technology, in the permanent magnet motor stator varnishing process, the varnishing parameters are mostly set based on experience, which makes it difficult to accurately adjust according to the specific parameters of the stator and the paint characteristics, resulting in unstable varnishing quality. In addition, the degree of automation of the varnishing and curing processes is low, and the production efficiency is not high. The varnishing quality inspection is mostly sampling inspection, which makes it difficult to fully reflect the varnishing quality of the stator. In addition, the feedback of the inspection results is not timely, and closed-loop control cannot be achieved. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, this application proposes a permanent magnet motor stator varnish dipping method and system, which improves the varnish dipping quality and production efficiency, reduces production costs, and reduces environmental pollution through intelligent and automated control and processing.

[0005] The following is the technical solution of the present invention, a permanent magnet motor stator varnish dipping method, comprising the following steps: S1. Clean and dry the stator; S2, dipping the pretreated stator into insulating paint to form a preliminary paint layer; S3, heating and curing the stator after the paint dipping to form a solid paint layer on the stator surface; S4. Perform quality inspection and sorting on the solidified stators.

[0006] As a preferred solution of the present invention, S1 includes the following steps: S101, spraying the stator with a cleaning liquid and scrubbing the stator surface, and after scrubbing is completed, rinsing the stator with clean water; Among them, the cleaning liquid adopts a neutral detergent solution with a concentration of 1-3%, and the brush adopts a soft material; S102, drying the cleaned stator by starting a hot air circulation system, and stopping the drying when the humidity reaches a set threshold; Among them, the drying time is 20-60 minutes; S103, perform a cleanliness test on the dried stator. If the cleanliness is qualified, proceed to S2; if the cleanliness is unqualified, return to S101 and reprocess; Among them, cleanliness detection adopts fluorescence detection method or whiteness detection method.

[0007] As a preferred solution of the present invention, in S101, the spray pressure expression is as follows: In the above formula, is the actual spray pressure, is the base spray pressure, is the pressure-temperature coefficient, is the actual cleaning fluid temperature, is the base cleaning fluid temperature.

[0008] As a preferred solution of the present invention, in S102, the drying temperature is expressed as follows: In the above formula, is the actual drying temperature, is the base drying temperature, is the temperature-humidity coefficient, is the initial humidity of the stator, The base humidity.

[0009] As a preferred solution of the present invention, S2 comprises the following steps: S201, delivering paint to the paint dipping tank according to the stator parameters and the paint dipping requirements, and adjusting the paint temperature and paint viscosity to the set values; S202, placing the pre-treated stator into a paint dipping tank, controlling the dipping time and pressure in the paint dipping tank and stirring; Among them, the stirring speed is 50-150r / min; S203, taking the stator out of the paint dipping tank and draining it, so that excess paint drips into the paint collecting tank; Among them, the draining time is 2-5 minutes.

[0010] As a preferred solution of the present invention, in S202, the immersion time and pressure are automatically adjusted, including the following steps: S2021. Collecting dimensional parameters and material parameters of the stator through sensors; Among them, the size parameters include length, outer diameter and inner diameter; S2022. Calculate the basic immersion time and basic immersion pressure based on the collected parameters. The expressions are as follows: In the above formula, is the basic immersion time, is the material coefficient, is the stator length, is the stator outer diameter, is the inner diameter of the stator, is the basic impregnation pressure, is the pressure coefficient, is the base pressure; S2023. Adjust the dipping time and dipping pressure according to the real-time viscosity and temperature of the paint. The expressions are as follows: In the above formula, is the adjusted immersion time, is the basic immersion time, is the base viscosity, is the reference temperature, is the real-time viscosity, is the real-time temperature, is the adjusted impregnation pressure, is the basic impregnation pressure, is the adjustment factor; S2024. The paint dipping tank performs the paint dipping operation according to the adjusted dipping time and pressure.

[0011] As a preferred solution of the present invention, S3 includes the following steps: S301, sending the drained stator into a curing oven, raising the temperature in the curing oven to the preheating temperature according to a set preheating rate, and maintaining the set preheating time; Among them, the preheating rate is 2-5℃ / min, the preheating temperature is 60-80℃, and the preheating time is 10-30 minutes; S302: After preheating is completed, the temperature in the furnace is raised to the curing temperature according to the set curing temperature curve, and the set curing time is maintained; Among them, the curing temperature is 120-180°C and the curing time is 60-180 minutes; S303: After curing is completed, the temperature in the furnace is lowered to room temperature according to the set cooling rate; The cooling rate is 1-3°C / min.

[0012] As a preferred solution of the present invention, S4 comprises the following steps: S401, using ultrasonic testing or eddy current testing to test the cured stator to determine whether the paint is evenly applied; S402, using a Shore hardness tester to test the curing quality of the stator to determine whether the hardness meets the standard; S403: If both the varnishing uniformity and the curing quality are qualified, the stator is sorted to the qualified product area; if not, proceed to S2.

[0013] A permanent magnet motor stator varnish dipping system, comprising: The pre-treatment module is used to clean and dry the permanent magnet motor stator to remove oil, dust and impurities on the stator surface; The varnish dipping module is used to immerse the pre-treated stator in insulating varnish so that the varnish fully penetrates into the gaps of the stator windings; The curing module is used to heat and cure the stator after the paint is dipped, so that the paint forms a solid paint layer on the stator surface; Inspection module, used to perform quality inspection on the stator after pretreatment, varnishing and curing; Paint circulation and recovery module, used to recover, filter and reuse excess paint generated during the painting process; The central control module is used to receive the detection data of each module and control the operating parameters of each module according to the preset algorithm. It is electrically connected to the pretreatment module, paint dipping module, curing module, detection module and paint circulation and recovery module.

[0014] As a preferred solution of the present invention, the paint circulation and recovery module includes: The paint collecting tank is used to collect excess paint dripping during the stator draining process and is arranged below the paint dipping tank of the paint dipping module; Filtering device, used to remove impurities from paint; A delivery pump is used to deliver the filtered paint to the paint storage tank; Paint storage tanks, used to store recycled paint; The filtering device comprises a filter screen with a pore size of 50-100 μm, a filter element with a pore size of 5-10 μm and an ion exchange resin column.

[0015] The beneficial effects of the present invention are: In the present invention, a central control module is used to uniformly control each module, and a variety of sensors are combined to collect data in real time, thereby achieving precise control of the varnishing process and improving the stability of the varnishing quality. In the present invention, the process parameters can be automatically adjusted according to the stator parameters and environmental conditions, further improving the quality of the varnishing and the adaptability of the process; In the present invention, the paint circulation and recovery module realizes the recovery and reuse of paint, reduces production costs and reduces environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the system of the present invention Figure 1 ; Figure 2Schematic diagram of the system of the present invention Figure 2 ; Figure 3 It is a step diagram of the method of the present invention; Figure 4 Flow chart of the method of the present invention; In the figure: 1. Pretreatment module; 101. Cleaning device; 102. Drying device; 2. Paint dipping module; 201. Paint dipping tank; 202. Paint temperature control device; 203. Viscosity adjustment device; 204. Stirring device; 205. Pressure control device; 3. Curing module; 301. Curing furnace; 302. Temperature control device; 303. Time control device; 4. Detection module; 401. Cleanliness detection device; 402. Paint dipping uniformity detection device; 403. Curing quality detection device; 5. Paint circulation and recovery module; 501. Paint collecting tank; 502. Filtering device; 503. Delivery pump; 504. Paint storage tank; 6. Delivery mechanism. DETAILED DESCRIPTION

[0017] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work shall fall within the scope of protection of the present invention.

[0018] Example 1 like Figure 1 and Figure 2 As shown, a permanent magnet motor stator varnish dipping system includes: Pretreatment module 1 is used to clean and dry the permanent magnet motor stator to remove impurities such as oil, dust, etc. on the stator surface in preparation for the subsequent varnishing process; The varnish dipping module 2 is used to immerse the pretreated stator in insulating varnish so that the varnish fully penetrates into the gaps of the stator windings; The curing module 3 is used to heat and cure the stator after the paint is dipped, so that the paint forms a solid paint layer on the stator surface; Inspection module 4 is used to perform quality inspection on the stators after pretreatment, varnishing and curing, to detect unqualified products in time and prevent them from flowing into the next process; The paint circulation and recovery module 5 is used to recover, filter and reuse the excess paint generated during the painting process, thereby improving the utilization rate of the paint, reducing production costs and reducing environmental pollution; The central control module is electrically connected to the pretreatment module 1, the paint dipping module 2, the curing module 3, the detection module 4 and the paint circulation and recovery module 5, receives the detection data of each module, and controls the operating parameters of each module according to the preset program and algorithm to achieve collaborative work between the modules.

[0019] In this embodiment, pretreatment module 1 is used to clean and dry the permanent magnet motor stator, removing impurities such as oil and dust from the stator surface in preparation for the subsequent varnishing process. Pretreatment module 1 includes a cleaning device 101 and a drying device 102. Cleaning device 101 is equipped with a high-pressure spraying device and a scrubbing device. This combination of high-pressure spraying and scrubbing removes stubborn stains from the stator surface. Drying device 102 circulates hot air for rapid and uniform drying, preventing residual moisture on the stator surface from affecting the varnishing quality. Cleaning device 101 and drying device 102 are connected by a conveyor mechanism 6, which drives the stator through the cleaning and drying processes in sequence.

[0020] The high-pressure spray pressure control algorithm expression of the cleaning device 101 of the pre-processing module 1 is as follows: In the above formula, is the actual spray pressure, is the base spray pressure, is the pressure-temperature coefficient, is the actual cleaning fluid temperature, is the reference cleaning fluid temperature. The value range is 0.2-0.4MPa, The value range is 0.005-0.01MPa / ℃, The value range is 40-60℃.

[0021] The hot air temperature control algorithm expression of the drying device 102 of the pre-processing module 1 is as follows: In the above formula, is the actual drying temperature, is the base drying temperature, is the temperature-humidity coefficient, is the initial humidity of the stator, is the reference humidity. The value range is 60-100℃, The value range is 10-20%.

[0022] In this embodiment, the paint dipping module 2 is used to immerse the pretreated stator in insulating paint, allowing the paint to fully penetrate the gaps in the stator windings. The paint dipping module 2 includes a paint dipping tank 201, a paint temperature control device 202, a viscosity adjustment device 203, a stirring device 204, and a pressure control device 205. The paint temperature control device 202 is used to control the paint temperature within an appropriate range to ensure that the paint has good fluidity and permeability; the viscosity adjustment device 203 is used to adjust the viscosity of the paint to meet the paint dipping requirements of stators of different models and specifications; the stirring device 204 is used to maintain the paint uniformity to prevent paint sedimentation or stratification; and the pressure control device 205 is used to control the pressure within the paint dipping tank 201 to improve the paint's penetration ability. The paint dipping tank 201 is connected to the drying device 102 of the pretreatment module 1 via a conveying mechanism 6. Stators that have passed the pretreatment enter the paint dipping tank 201 through the conveying mechanism 6 for paint dipping.

[0023] In this embodiment, the curing module 3 is used to heat and cure the stator after paint dipping, so that the paint forms a solid paint layer on the stator surface. The curing module 3 includes a curing oven 301, a temperature control device 302, and a time control device 303. The temperature control device 302 is used to control the temperature within the curing oven 301 to ensure that the paint is cured according to the set curing curve; the time control device 303 is used to control the curing time to ensure that the paint is fully cured. The curing oven 301 is connected to the paint dipping tank 201 of the paint dipping module 2 via the conveying mechanism 6. The stator after paint dipping enters the curing oven 301 through the conveying mechanism 6 for curing.

[0024] In this embodiment, the inspection module 4 is used to perform quality inspections on the stator after pretreatment, paint dipping, and curing, promptly identifying unqualified products and preventing them from entering the next process. The inspection module 4 includes a cleanliness inspection device 401, a paint dipping uniformity inspection device 402, and a curing quality inspection device 403. The cleanliness inspection device 401 is located on the conveying mechanism 6 between the drying device 102 of the pretreatment module 1 and the paint dipping tank 201 of the paint dipping module 2. It is used to inspect the cleanliness of the stator after pretreatment to ensure that the stator surface entering the paint dipping process is free of impurities. The paint dipping uniformity inspection device 402 and the curing quality inspection device 403 are located on the conveying mechanism 6 at the output end of the curing furnace 301 of the curing module 3. They are used to inspect the paint dipping uniformity and curing quality of the stator after curing, respectively.

[0025] In this embodiment, the paint circulation and recovery module 5 is used to recover, filter and reuse the excess paint generated during the paint dipping process, improve the utilization rate of paint, reduce production cost and reduce environmental pollution. The paint circulation and recovery module 5 includes a paint collection tank 501, a filtering device 502, a delivery pump 503 and a paint storage tank 504. The paint collection tank 501 is arranged below the paint dipping tank 201 of the paint dipping module 2 and is used to collect the excess paint dripping during the stator draining process; the filtering device 502 is used to remove impurities in the paint to ensure the quality of the recovered paint; the delivery pump 503 is used to deliver the filtered paint to the paint storage tank 504; and the paint storage tank 504 is used to store the recovered paint for delivery to the paint dipping tank 201 again.

[0026] The paint circulation and recovery module 5 filters and purifies the paint impurities on line, removes impurities in the recovered paint, improves the utilization rate of paint and the quality of paint dipping. The excess paint generated during the paint dipping process is collected by the paint collection tank 501, which is provided with an inclination angle of 5-10° at the bottom to facilitate the convergence of paint. The collected paint enters the filtering device 502 and is subjected to primary filtration through a filter screen with a pore size of 50-100 μm to remove larger particle impurities such as debris falling off the surface of the stator and lumps in the paint. The paint after primary filtration enters a fine filtration unit and is filtered through a filter core with a pore size of 5-10 μm to remove fine particle impurities such as pigment particles and dust in the paint. The filter core is made of sintered metal mesh or a high polymer material. The paint after fine filtration passes through an ion exchange resin column to remove metal ions and other impurities in the paint, thereby avoiding the influence of metal ions on the insulation performance of the paint. The purified paint is delivered to the paint storage tank 504 after its viscosity is adjusted to a set value by adding a diluent or heating. The paint in the paint storage tank 504 is delivered to the paint dipping tank 201 as needed to realize recycling.

[0027] In this embodiment, the central control module is electrically connected with the pretreatment module 1, the paint dipping module 2, the curing module 3, the detection module 4 and the paint circulation and recovery module 5 respectively, receives detection data of the modules and controls the operating parameters of the modules according to preset programs and algorithms to realize the collaborative work of the modules.

[0028] Embodiment Two As shown in Figure 3 and Figure 4 , a method for dipping an insulating paint on a stator of a permanent magnet motor, comprising the following steps: S1, cleaning and drying the stator of the permanent magnet motor; S2, dipping the pretreated stator in insulating paint to form a preliminary paint layer; S3, heating and curing the stator after paint dipping to form a solid paint layer on the surface of the stator; S4, quality detection and sorting of the cured stator.

[0029] In step S1, the permanent magnet motor stator is pretreated. The purpose of pretreatment is to remove oil stains, dust and other impurities on the surface of the stator, to ensure that the surface of the stator is clean and dry, and to create good conditions for the subsequent paint dipping process, including the following steps: S101, the permanent magnet motor stator to be processed is placed in the cleaning device 101 of the pretreatment module 1, the high-pressure spraying device is started, and the stator is sprayed with cleaning liquid. The cleaning liquid is a neutral detergent solution, and the concentration is controlled at 1-3%.

[0030] The spraying pressure is controlled according to At the same time, the brushing device is started to brush the surface of the stator. The brush of the brushing device is made of soft material to avoid scratching the surface of the stator. After brushing, the stator is rinsed with clean water to remove residual cleaning liquid.

[0031] S102, the cleaned stator is sent to the drying device 102, the hot air circulation system is started, the drying temperature is controlled according to The drying time is generally 20-60 minutes. The humidity of the stator is monitored in real time during the drying process, and the drying is stopped when the humidity reaches the set threshold.

[0032] S103, the cleaned stator is detected by the cleanliness detection device 401. The fluorescence detection method or whiteness detection method is adopted. If the detection is qualified, step S2 is entered; if it is not qualified, it is returned to sub-step S101 for reprocessing.

[0033] In step S2, the stator is immersed in insulating paint to allow the paint to fully penetrate into the gap of the stator winding to form a preliminary paint layer, including the following steps: S201, the central control module controls the paint tank 504 to deliver paint to the dipping tank 201 according to the parameters of the stator and the dipping requirements, adjusts the temperature of the paint to the set value through the paint temperature control device 202, and adjusts the viscosity of the paint to the set value through the viscosity adjusting device 203.

[0034] S202, the pretreated stator is placed in the dipping tank 201, and the pressure and dipping time in the dipping tank 201 are controlled. The stirring device 204 is started during the dipping process, and the stirring speed is 50-150 r / min to keep the paint uniform.

[0035] S203, after the dipping is completed, the stator is taken out of the dipping tank 201 and placed in the draining area, and the excess paint is dropped into the paint collection tank 501. The draining time is generally 2-5 minutes.

[0036] In step S202, the dipping parameters are adjusted according to the specific parameters of the stator and the real-time state of the paint to automatically adjust the dipping parameters and improve the stability of the dipping quality, including the following steps: S2021. Collecting dimensional parameters and material parameters of the stator through sensors; Size parameters include length , outer diameter and inner diameter ,Material parameters include the material of the winding wire and the type of insulation layer.

[0037] S2022. Calculate the basic immersion time based on the collected parameters , the expression is as follows: In the above formula, is the basic immersion time, is the material coefficient, is the stator length, is the stator outer diameter, is the inner diameter of the stator.

[0038] Calculation of basic impregnation pressure , the expression is as follows: In the above formula, is the basic impregnation pressure, is the pressure coefficient, is the base pressure, is the stator outer diameter, is the inner diameter of the stator.

[0039] S2023, according to the real-time viscosity of the paint and temperature , adjust the basic immersion time and pressure, the expression is as follows: In the above formula, is the adjusted immersion time, is the basic immersion time, is the base viscosity, is the reference temperature, is the real-time viscosity, is the real-time temperature, is the adjusted pressure, is the basic impregnation pressure, is the adjustment factor.

[0040] S2024, the paint tank 201 is immersed in the paint according to the adjusted dipping time and pressure Carry out the dipping operation.

[0041] In step S3, the stator after the paint dip is heated and cured. Curing is to form a strong and dense insulating paint layer on the stator surface by heating to cause a chemical reaction in the paint. The curing process includes the following steps: S301, the drained stator is sent to the curing oven 301, the temperature control device 302 is started, the temperature in the curing oven 301 is raised to the preheating temperature according to the set preheating rate, and the preheating time is maintained to remove the solvent in the paint; The preheating rate is 2-5°C / min, the preheating temperature is 60-80°C, and the preheating time is 10-30 minutes.

[0042] S302: After preheating is completed, the temperature in the furnace is raised to the curing temperature according to the set curing temperature curve, and the set curing time is maintained to fully cure the paint; The curing temperature is 120-180° C., and the curing time is 60-180 minutes.

[0043] S303. After solidification is completed, the temperature in the furnace is lowered to room temperature according to the set cooling rate to avoid stress in the stator due to rapid cooling; The cooling rate is 1-3°C / min.

[0044] In step S4, the quality of the solidified stators is inspected and sorted to promptly detect unqualified products and prevent them from flowing into the next process, thereby ensuring that the products meet the requirements. The steps include: S401, the paint uniformity detection device 402 detects the stator after curing, and can use ultrasonic detection method or eddy current detection method to determine whether the paint is uniform.

[0045] S402 , the curing quality detection device 403 detects the curing quality of the stator, and uses a Shore hardness tester to detect the hardness to determine whether the hardness meets the standard.

[0046] S403: If both the varnishing uniformity and the curing quality are qualified, the stator varnishing process is completed and sorted to the qualified product area; if it is unqualified, it is reworked according to the test results and re-varnished and re-cured in step S2.

[0047] The system of the present invention integrates functions such as pretreatment, painting, curing, detection and paint recovery, realizes the automated and integrated processing of permanent magnet motor stator painting, and improves production efficiency; adopts a central control module to uniformly control each module, and combines multiple sensors to collect data in real time, realizes precise control of the painting process, and improves the stability of the painting quality; can automatically adjust the process parameters according to stator parameters and environmental conditions, further improves the painting quality and process adaptability; the paint circulation and recovery module 5 realizes the recycling and reuse of paint, reduces production costs, and reduces environmental pollution.

[0048] Although preferred embodiments of the present invention have been described, further changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are understood. It is apparent that various changes and modifications may be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. Thus, the present invention is intended to encompass such changes and modifications as fall within the scope of equivalents of the present invention.

Claims

1. A permanent magnet motor stator varnish dipping method, characterized in that: The following steps are involved: S1. Clean and dry the stator; S2, dipping the pretreated stator into insulating paint to form a preliminary paint layer; S3, heating and curing the stator after the paint dipping to form a solid paint layer on the stator surface; S4. Perform quality inspection and sorting on the solidified stators.

2. A permanent magnet motor stator varnishing method according to claim 1, characterized in that: S1 includes the following steps: S101, spraying the stator with a cleaning liquid and scrubbing the stator surface, and after scrubbing is completed, rinsing the stator with clean water; Among them, the cleaning liquid adopts a neutral detergent solution with a concentration of 1-3%, and the brush adopts a soft material; S102, drying the cleaned stator by starting a hot air circulation system, and stopping the drying when the humidity reaches a set threshold; Among them, the drying time is 20-60 minutes; S103, perform a cleanliness test on the dried stator. If the cleanliness is qualified, proceed to S2; if the cleanliness is unqualified, return to S101 and reprocess; Among them, cleanliness detection adopts fluorescence detection method or whiteness detection method.

3. A permanent magnet motor stator varnishing method according to claim 2, characterized in that: In S101, the spray pressure expression is as follows: In the above formula, is the actual spray pressure, is the base spray pressure, is the pressure-temperature coefficient, is the actual cleaning fluid temperature, is the base cleaning fluid temperature.

4. A permanent magnet motor stator varnishing method according to claim 2, characterized in that: In S102, the drying temperature expression is as follows: In the above formula, is the actual drying temperature, is the base drying temperature, is the temperature-humidity coefficient, is the initial humidity of the stator, The base humidity.

5. The method for varnishing a permanent magnet motor stator according to claim 1, characterized in that: S2 includes the following steps: S201, delivering paint to the paint dipping tank according to the stator parameters and the paint dipping requirements, and adjusting the paint temperature and paint viscosity to the set values; S202, placing the pre-treated stator into a paint dipping tank, controlling the dipping time and pressure in the paint dipping tank and stirring; Among them, the stirring speed is 50-150r / min; S203, taking the stator out of the paint dipping tank and draining it, so that excess paint drips into the paint collecting tank; Among them, the draining time is 2-5 minutes.

6. A permanent magnet motor stator varnish dipping method according to claim 5, characterized in that: In S202, the immersion time and pressure are automatically adjusted, including the following steps: S2021. Collecting dimensional parameters and material parameters of the stator through sensors; Among them, the size parameters include length, outer diameter and inner diameter; S2022. Calculate the basic immersion time and basic immersion pressure based on the collected parameters. The expressions are as follows: In the above formula, is the basic immersion time, is the material coefficient, is the stator length, is the stator outer diameter, is the inner diameter of the stator, is the basic impregnation pressure, is the pressure coefficient, is the base pressure; S2023. Adjust the dipping time and dipping pressure according to the real-time viscosity and temperature of the paint. The expressions are as follows: In the above formula, is the adjusted immersion time, is the basic immersion time, is the base viscosity, is the reference temperature, is the real-time viscosity, is the real-time temperature, is the adjusted impregnation pressure, is the basic impregnation pressure, is the adjustment factor; S2024. The paint dipping tank performs the paint dipping operation according to the adjusted dipping time and pressure.

7. The method for varnishing a permanent magnet motor stator according to claim 1, characterized in that: S3 includes the following steps: S301, sending the drained stator into a curing oven, raising the temperature in the curing oven to the preheating temperature according to a set preheating rate, and maintaining the set preheating time; Among them, the preheating rate is 2-5℃ / min, the preheating temperature is 60-80℃, and the preheating time is 10-30 minutes; S302: After preheating is completed, the temperature in the furnace is raised to the curing temperature according to the set curing temperature curve, and the set curing time is maintained; Among them, the curing temperature is 120-180°C and the curing time is 60-180 minutes; S303: After curing is completed, the temperature in the furnace is lowered to room temperature according to the set cooling rate; The cooling rate is 1-3°C / min.

8. The method for varnishing a permanent magnet motor stator according to claim 1, characterized in that: S4 includes the following steps: S401, using ultrasonic testing or eddy current testing to test the cured stator to determine whether the paint is evenly applied; S402, using a Shore hardness tester to test the curing quality of the stator to determine whether the hardness meets the standard; S403: If both the varnishing uniformity and the curing quality are qualified, the stator is sorted to the qualified product area; if not, proceed to S2.

9. A permanent magnet motor stator varnishing system, suitable for a permanent magnet motor stator varnishing method according to any one of claims 1 to 8, characterized in that: include: The pre-treatment module is used to clean and dry the permanent magnet motor stator to remove oil, dust and impurities on the stator surface; The varnish dipping module is used to immerse the pre-treated stator in insulating varnish so that the varnish fully penetrates into the gaps of the stator windings; The curing module is used to heat and cure the stator after the paint is dipped, so that the paint forms a solid paint layer on the stator surface; Inspection module, used to perform quality inspection on the stator after pretreatment, varnishing and curing; Paint circulation and recovery module, used to recover, filter and reuse excess paint generated during the painting process; The central control module is used to receive the detection data of each module and control the operating parameters of each module according to the preset algorithm. It is electrically connected to the pretreatment module, paint dipping module, curing module, detection module and paint circulation and recovery module.

10. A permanent magnet motor stator varnishing system according to claim 9, characterized in that: The paint recycling and recovery module includes: The paint collecting tank is used to collect excess paint dripping during the stator draining process and is arranged below the paint dipping tank of the paint dipping module; Filtering device, used to remove impurities from paint; A delivery pump is used to deliver the filtered paint to the paint storage tank; Paint storage tanks, used to store recycled paint; The filtering device comprises a filter screen with a pore size of 50-100 μm, a filter element with a pore size of 5-10 μm and an ion exchange resin column.

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