An integrated insulation treatment method for a motor armature resistant to 450 °C

Abstract

The present invention belongs to the field of motor processing and manufacturing, and in particular, to an integrated insulation treatment method for a motor armature resistant to 450 °C, including: 1. Using a staged temperature increase method to degrease the armature core, effectively improving the adhesion between the inorganic ceramic insulation paint and the core; 2. After vacuum impregnating the armature core slots with paint, using a temperature increase heating method for baking and curing, improving the density and continuity of the insulation coating of the core winding; 3. After vacuum impregnating the armature core winding with paint, using a temperature increase heating method for baking and curing, enabling the inorganic ceramic insulation paint to sinter with the winding to form an inorganic ceramicized insulation layer; The motor armature made by this method has excellent high-temperature resistance and temperature change resistance, meeting the requirements for the motor to operate under high-temperature conditions of 450 °C.

Description

Technical Field

[0001] The invention belongs to the field of motor processing and manufacturing, and in particular to an integrated insulation processing method for a motor armature resistant to 450°C. Background Art

[0002] With the continuous strengthening of the independent development of major projects such as the new generation of missiles, torpedoes and "TBCC" engines, extremely high requirements are also put forward for power equipment - generators, which are required to have the characteristics of small size, high speed, high power density, high insulation stability, etc., and can run stably for ≮100h under 450℃ environment. The armature is the "heart" of the generator and one of the key structures of the generator. Its performance directly affects the stability and reliability of the motor. The armature is generally composed of armature core, electromagnetic wire and insulating material. The insulating material is generally organic insulating material, and its use temperature is limited to below 220℃, which obviously cannot meet the use requirements of 450℃ high-temperature and high-speed generators. Therefore, it is of great significance to study the insulation treatment process of the armature of the motor resistant to 450℃.

[0003] Chinese invention patent CN106549541B discloses a high-temperature motor armature insulation treatment process. The armature core and the armature are both impregnated with 400°C high-temperature motor varnish, which is a silicone-modified epoxy varnish with ultrafine ceramic micro-peaks and glass powder added. The prepared armature can meet the 400°C high temperature requirement.

[0004] Chinese utility model CN215009806 discloses potting the coil with a mixture of nano-quartz powder and silicone resin. After curing, the winding can withstand 500°C, but the stable operating temperature of the motor does not exceed 350°C.

[0005] Through the analysis of existing technologies, it can be known that high-temperature motor insulation systems can be divided into two types. One is an insulation system with organic materials as the main body, and its maximum tolerance temperature does not exceed 260°C. The other is an organic-inorganic insulation system, which is based on a high-temperature resistant organic insulation system and is prepared with inorganic binders and inorganic fillers. It can withstand no more than 400°C. The above two technical systems are not out of the scope of organic insulation systems, and currently armature insulation with a temperature resistance level of >350°C is mostly oriented towards silicone modified coatings, and there are few solutions to achieve high-temperature resistance of the armature by improving the process of impregnation or coating of insulating varnish.

[0006] Although a process method for strengthening the insulation treatment of motor windings, such as disclosed in Chinese invention patent CN103607087A, adopts a "hot air flow - vacuum - hot air flow" composite drying process to separate the volatilization of solvents and the oxidative polymerization of resins and drying oils in the paint base, avoiding their mutual interference and restriction, uses an advanced composite vacuum impregnation dryer and excellent performance 1038 melamine alkyd impregnating paint, and goes through processes such as white blank pre - drying and vacuum moisture removal, primary vacuum impregnation, primary vacuum drying and high - temperature curing, secondary vacuum impregnation, secondary vacuum drying and high - temperature curing, spraying 8363 melamine alcohol epoxy gray porcelain paint, and high - temperature drying and curing, and recovers and utilizes the volatilized solvents through condensation, the research direction of this technical solution is to improve moisture resistance, chemical stability, insulation performance and save electric energy, without researching the high - temperature performance of the armature.

[0007] Although Chinese invention patent CN104485767B discloses a high - voltage motor stator coil insulation structure and its impregnation and curing process, the voltage grade of the coil insulation is 6kV, the coil is in a strip structure, 240 - grade aromatic polyimide enameled copper flat wire is selected as the strand wire, two layers of polyimide film glass cloth less - adhesive mica tape are half - lapped and wound around each turn of wire as the turn - to - turn insulation layer; four layers of polyimide film glass cloth less - adhesive mica tape are half - lapped and wound as the main insulation layer of the coil to the ground, and one layer of ET100 - 25 glass ribbon is half - lapped and wound as the outermost protective layer. The coil is subjected to VPI vacuum pressure impregnation and curing using an organosilicon solvent - free impregnating resin, and the insulation structure thermal evaluation test is carried out on the impregnated and cured coil according to standard GB / T17948. The temperature resistance index of the insulation structure is evaluated as 244°C, the temperature resistance grade is evaluated as 220, and the maximum operating temperature under a 60 - year service life reaches 191°C; however, this technical solution still does not break away from organic materials, and its operating temperature cannot reach 450°C.

[0008] In summary, in the prior art, the life of high - temperature insulating paint at 450°C has not been reported, and it is difficult to meet the requirements for the motor to operate under the condition of 450°C high temperature. Therefore, it is crucial to research an insulating method that can meet the operation of the motor under the condition of 450°C. Summary of the Invention

[0009] The present invention aims at the deficiencies of the prior art and proposes an integrated insulation treatment method for a motor armature resistant to 450°C.

[0010] Specifically, it is realized through the following technical solutions:

[0011] An integrated insulation treatment method for a motor armature resistant to 450°C, comprising the following steps:

[0012] Step 1: Armature core pretreatment

[0013] Take the stacked armature core and perform degreasing treatment by means of staged temperature rise, and then perform atmospheric plasma cleaning treatment on the degreased armature core;

[0014] The staged temperature rise method is to perform heat preservation treatment at 115 - 125 °C, 175 - 185 °C, 245 - 255 °C, 245 - 355 °C, and 445 - 455 °C for 1.8 - 2.2 h in sequence, and the heating rate for each temperature section is (5 - 10) °C / min;

[0015] Step 2: Slot insulation treatment of the armature core

[0016] Protect the inner and outer circles of the armature core with tape, and then use inorganic ceramic insulating paint to perform vacuum impregnation on the slots of the armature core 2 - 3 times. After the vacuum impregnation is completed, use the staged heating method to bake and cure the slots of the armature core;

[0017] The staged heating method is to perform heat preservation treatment at 75 - 85 °C, 145 - 155 °C, 245 - 255 °C, 345 - 355 °C, and 445 - 455 °C for 1.8 - 2.2 h in sequence, and the heating rate for each temperature section is (10 - 15) °C / min.

[0018] Step 3: Overall insulation treatment of the armature

[0019] Wind the armature core with inorganic ceramic high-temperature electromagnetic wire, and weld the common points with silver-lead solder by means of high-frequency heating. Then use inorganic ceramic insulating paint to perform vacuum impregnation on the armature 2 - 3 times; after the vacuum impregnation of the armature is completed, use the staged heating method to bake and cure the armature core, so that the inorganic ceramic insulating paint is sintered together with the winding to form a ceramicized insulating layer;

[0020] The staged heating method is to perform heat preservation treatment at 75 - 85 °C, 145 - 155 °C, 245 - 255 °C, 345 - 355 °C, and 445 - 455 °C for 1.8 - 2.2 h in sequence, and the heating rate for each temperature section is (10 - 15) °C / min.

[0021] The stacked armature core is made by stamping silicon steel sheets into punching pieces, stacking them into an armature core, and performing laser welding on the outer circle and inner teeth of the armature core.

[0022] The process parameters of the plasma cleaning are: the atmosphere is compressed air (CDA), and the time is 15 s.

[0023] In Step 2, the viscosity of the inorganic ceramic insulating paint is 20 - 30 s, and the purpose is to ensure that the paint liquid forms a uniform paint layer in the slots of the armature core without high points.

[0024] In step three, the viscosity of the inorganic ceramic insulating paint is 40 - 50 s, aiming to ensure the permeability of the paint liquid between windings and in the slots between the windings and the armature iron core, as well as the amount of paint adhering.

[0025] The inorganic ceramic insulating paint is a commercially available product.

[0026] After the inorganic ceramic insulating paint is cured, the linear expansion coefficient is (10 - 15)×10 -6 / ℃, and the temperature resistance is ≥450℃.

[0027] In step two, the process parameters of the vacuum impregnation are: the vacuum degree is 2000 Pa - 3000 Pa, the temperature is 25℃ - 35℃, and the time is 5 min - 10 min.

[0028] In step three, the process parameters of the vacuum impregnation are: the vacuum degree is 1500 Pa - 2500 Pa, the temperature is 25℃ - 35℃, and the time is 10 min - 15 min.

[0029] The minimum bending radius performance of the inorganic ceramic high - temperature electromagnetic wire is ≥7 times the outer diameter of the electromagnetic wire.

[0030] The inorganic ceramic high - temperature electromagnetic wire has the characteristic of high temperature resistance, and the lowest temperature for high temperature resistance is 450℃.

[0031] The insulation layer thickness of the inorganic ceramic high - temperature electromagnetic wire is 0.01 mm - 0.05 mm.

[0032] The inorganic ceramic high - temperature electromagnetic wire is a high - temperature electromagnetic wire in which inorganic ceramic materials are sintered on the surface layer of the conductor after high - temperature treatment.

[0033] The conductor is a nickel - plated copper wire.

[0034] The key points of the present invention are as follows: 1. Adopting a step - by - step temperature - rising method to degrease the armature iron core, effectively improving the adhesion between the inorganic ceramic insulating paint and the iron core; 2. After vacuum impregnating the armature iron core slots, adopting a temperature - rising heating method for baking and curing, improving the denseness and continuity of the insulation coating of the iron core winding; 3. After vacuum impregnating the armature iron core winding, adopting a temperature - rising heating method for baking and curing, making the inorganic ceramic insulating paint sinter with the winding to form an inorganic ceramicized insulation layer; The motor armature made by this method has excellent high - temperature resistance and temperature change resistance, meeting the requirements for the motor to operate at a high temperature of 450℃. 4. Defining the linear expansion coefficient of the inorganic ceramic insulating paint as (10 - 15)×10 -6 / ℃, which can prevent the insulating paint from peeling off, cracking, etc. when the operating temperature of the motor armature is ≥450℃ or when the motor armature returns to the non - working state. When the linear expansion coefficient is lower than 10×10 -6 / °C, after the insulating paint is cured, the rigidity of the paint film increases, and the matching of the linear expansion coefficient of the paint film with that of the iron core and the high-temperature electromagnetic wire becomes poor. After high and low temperature aging, the paint film will crack; while when the linear expansion coefficient is higher than 15×10 -6 / °C, after the insulating paint is cured, the toughness of the paint film increases, and the matching of the linear expansion coefficient of the paint film with that of the iron core and the high-temperature electromagnetic wire becomes poor. After high and low temperature aging, the paint film cracks due to the expansion of the paint film.

[0035] Beneficial effects:

[0036] The method of the present invention can be used for the surface insulation treatment of the armature of a motor with an operating temperature of 450°C. The treated armature has excellent high-temperature resistance and temperature change resistance;

[0037] Among them, the high-temperature resistance is specifically manifested as:

[0038] 1. The armature of the motor treated by the insulation method of the present invention is aged at 450°C for 100 h, and the insulation performance does not fail.

[0039] 2. The armature of the motor treated by the insulation method of the present invention has an insulation resistance at 450°C that meets the requirements of no more than 5 mA of leakage current, no surface flashover and breakdown phenomenon under an alternating voltage of 1000 V, 50 Hz, and a duration of 1 min in a normal atmospheric environment.

[0040] 3. The armature of the motor treated by the insulation method of the present invention has a dielectric strength at 450°C that meets the requirement of a resistance of not less than 2000 MΩ.

[0041] 4. The armature of the motor treated by the insulation method of the present invention has a life of 100 h at 450°C.

[0042] The temperature change resistance is manifested as: After the armature of the motor treated by the insulation method of the present invention is treated with a cycle of -60°C to 450°C, with 1 h of heat preservation at high and low temperatures each, for a total of 10 cycles, the paint film is intact and no cracking phenomenon occurs.

[0043] In summary, the armature of the motor treated by the insulation method of the present invention can meet the requirements of the TBCC engine for high temperature, high speed, and high power density. Description of the drawings

[0044] Figure 1 : Sample diagram after the insulation treatment of the armature iron core slot in Example 1;

[0045] Figure 2 : Sample diagram after the insulation treatment of the armature iron core slot in Example 2;

[0046] Figure 3 : Sample diagram after the integrated insulation treatment of the armature ceramic of the present invention. Detailed implementation manners

[0047] The following further elaborates on the specific implementation manners of the present invention. However, the present invention is not limited to these implementation manners. Any improvement or substitution based on the basic spirit of this embodiment still falls within the scope protected by the claims of the present invention.

[0048] An integrated insulation treatment method for a motor armature resistant to 450 °C includes the following steps:

[0049] Step 1: Armature core pretreatment

[0050] 1.1 Stamp silicon steel sheets into punching sheets, stack them into an armature core, and perform laser welding on the outer circle and inner teeth of the armature core to improve the dimensional stability of the armature core;

[0051] 1.2 Take the stacked armature core and perform degreasing treatment in a staged heating manner; the staged heating manner is to keep the temperature at 115 - 125 °C for 1.8 - 2.2 h first, then raise the temperature to 175 - 185 °C and keep it for 1.8 - 2.2 h, then raise the temperature to 245 - 255 °C and keep it for 1.8 - 2.2 h, then raise the temperature to 345 - 355 °C and keep it for 1.8 - 2.2 h, and finally raise the temperature to 445 - 455 °C and keep it for 1.8 - 2.2 h, briefly written as: (120 ± 5) °C / (2 ± 0.2) h + (180 ± 5) °C / (2 ± 0.2) h + (250 ± 5) °C / (2 ± 0.2) h + (350 ± 5) °C / (2 ± 0.2) h + (450 ± 5) °C / (2 ± 0.2) h, and the heating rate for each temperature segment is (5 - 10) °C / min; in the present invention, degreasing is carried out in a staged heating manner during the core pretreatment process to ensure that the stamping oil between the punching sheets is completely discharged, and to avoid the reduction of the adhesion between the inorganic ceramic insulating paint and the core when the stamping oil volatilizes at high temperature;

[0052] 1.3 Perform plasma cleaning treatment on the degreased armature core with compressed air for 15 s; the present invention uses atmospheric plasma treatment, which can reduce the surface activation energy of the armature core and improve the bonding effect between the inorganic ceramic insulating paint and the core;

[0053] Step 2: Armature core slot insulation treatment

[0054] Protect the inner and outer circles of the armature core with tape, and then, under the conditions of a vacuum degree of 2000 Pa - 3000 Pa and a temperature of 25 °C - 35 °C, use an insulating paint with a viscosity of 20 - 30 s and a linear expansion coefficient of (10 - 15) × 10 -6The armature core slots are vacuum impregnated with an inorganic ceramic insulating paint with a temperature resistance of ≥ 450 °C for 5 to 10 minutes, and a total of 2 to 3 times of vacuum impregnation are carried out. After the vacuum impregnation is completed, the armature core slots are baked and cured by a staged heating method; the staged heating method is to first raise the temperature to 75 - 85 °C and hold for 1.8 - 2.2 h, then raise the temperature to 145 - 155 °C and hold for 1.8 - 2.2 h, then raise the temperature to 245 - 255 °C and hold for 1.8 - 2.2 h, then raise the temperature to 345 - 355 °C and hold for 1.8 - 2.2 h, and finally raise the temperature to 445 - 455 °C and hold for 1.8 - 2.2 h, which is abbreviated as: (80 ± 5) °C / (2 ± 0.2) h + (150 ± 5) °C / (2 ± 0.2) h + (250 ± 5) °C / (2 ± 0.2) h + (350 ± 5) °C / (2 ± 0.2) h + (450 ± 5) °C / (2 ± 0.2) h. The heating rate for each temperature segment is (10 - 15) °C / min; in the present invention, the core slots are baked and cured by a heating method. Low-temperature treatment is carried out at 80 °C - 150 °C to ensure that the diluent and moisture in the inorganic ceramic insulating paint are fully volatilized, accelerating the film-forming effect. The temperature is gradually raised to the range of 245 - 255 °C to fully volatilize the trace crystal water in the filler in the insulating paint. Finally, at high temperature, the dispersed phases are sintered to improve the density and continuity of the insulating coating;

[0055] Step Three Armature Overall Insulation Treatment

[0056] Wind the armature core with an inorganic ceramic high-temperature electromagnetic wire with a temperature resistance of ≥ 450 °C. The common point of the winding is welded by a silver-copper solder in a high-frequency heating manner. Then, under the conditions of a vacuum degree of 1500 Pa - 2500 Pa and a temperature of 25 °C - 35 °C, the viscosity is 40 - 50 s, and the linear expansion coefficient is (10 - 15) × 10 -6The armature is vacuum impregnated with an inorganic ceramic insulating paint with a temperature resistance of not less than 450 °C for 10 to 15 minutes, and the vacuum impregnation is carried out 2 to 3 times in total; after the armature is vacuum impregnated, the armature core is baked and cured by a stage heating method, so that the inorganic ceramic insulating paint is sintered with the winding to form a ceramicized insulating layer; the stage heating method is to first raise the temperature to 75 - 85 °C and keep it warm for 1.8 - 2.2 h, then raise the temperature to 145 - 155 °C and keep it warm for 1.8 - 2.2 h, then raise the temperature to 245 - 255 °C and keep it warm for 1.8 - 2.2 h, then raise the temperature to 345 - 355 °C and keep it warm for 1.8 - 2.2 h, and finally raise the temperature to 445 - 455 °C and keep it warm for 1.8 - 2.2 h, abbreviated as: (80 ± 5) °C / (2 ± 0.2) h + (150 ± 5) °C / (2 ± 0.2) h + (250 ± 5) °C / (2 ± 0.2) h + (350 ± 5) °C / (2 ± 0.2) h + (450 ± 5) °C / (2 ± 0.2) h, and the heating rate for each temperature segment is (10 - 15) °C / min; in the present invention, after the armature is vacuum impregnated, the armature is baked and cured by a heating method, so that the inorganic ceramic insulating paint is sintered with the winding to form a ceramicized insulating layer.

[0057] The minimum bending radius performance of the inorganic ceramic high-temperature electromagnetic wire with a temperature resistance of not less than 450 °C is ≥ 7 times the outer diameter of the electromagnetic wire.

[0058] The inorganic ceramic high-temperature electromagnetic wire with a temperature resistance of not less than 450 °C is a high-temperature electromagnetic wire obtained by sintering an inorganic ceramic material on the surface of a conductor after high-temperature treatment.

[0059] The conductor is a nickel-plated copper wire.

[0060] Example 1

[0061] An integrated insulation treatment method for a 450 °C-resistant motor armature includes the following steps:

[0062] Step 1 Armature core pretreatment

[0063] 1.1 Use 50WW310 silicon steel strips to punch 18-tooth armature laminations, stack them, and the stacking factor is not less than 98%. The length of the armature core is (25 ± 0.1) mm, and 6 equally distributed welds are made on the inner and outer circles of the armature core by laser welding technology;

[0064] 1.2 Place the armature core obtained in step 1.1 in a vacuum furnace, and treat the stamping oil remaining on the surface of the armature punching sheet in a staged heating method; the staged heating method is 120℃ / 2h+180℃ / 2h+250℃ / 2h+350℃ / 2h+450℃ / 2h, and the heating rate of each temperature section is 5℃ / min; between 120℃ and 180℃, the stamping oil begins to burn, decompose and volatilize; continue to heat from 180℃ to 250℃ to completely decompose and volatilize the stamping oil; continue to heat from 250℃ to 350℃ to start carbonizing the non-volatile matter of the stamping oil; continue to heat from 350℃ to 450℃ to completely carbonize the non-volatile matter of the stamping oil;

[0065] 1.3 The armature core obtained in step 1.2 is subjected to plasma cleaning, the plasma cleaning gas is CDA, and the time is 15s;

[0066] Step 2: Insulation treatment of armature core slots

[0067] 2.1 Use diluent xylene to adjust the viscosity of the inorganic ceramic insulating paint, and use a Tu-4 viscometer to test the viscosity of the paint liquid for 20s, and then set it aside; the viscosity of the inorganic ceramic insulating paint is 20s, and the linear expansion coefficient is 10×10 -6 / ℃, temperature resistance ≥450℃;

[0068] 2.2 Protect the inner and outer circles of the armature core obtained in step 1 with 3M tape, suspend the armature core slot in the paint immersion container, pour inorganic ceramic insulating paint into the paint immersion container, and the process liquid level should be more than 50mm above the highest point of the armature core slot; place the paint immersion container in a vacuum drying oven, set the vacuum degree to 2000Pa, the temperature to 28℃, and the time to 6min, and start the vacuum drying oven for vacuum immersion; after vacuum immersion, place the armature core in a muffle furnace for curing. After curing, cool it down to below 150℃ with the furnace and take it out ; The curing adopts a stage heating mode, specifically 80℃ / 2h+150℃ / 2h+250℃ / 2h+350℃ / 2h+450℃ / 2h, and the heating rate of each temperature section is 10℃ / min; low-temperature treatment is carried out at 80℃~150℃ to ensure that the diluent and water in the inorganic ceramic insulating paint are fully volatilized, accelerate the film-forming effect, and gradually increase the temperature to 250℃ to fully volatilize the trace crystalline water in the filler in the insulating paint, and finally sinter the dispersed phases at high temperature to improve the density and continuity of the insulating coating;

[0069] 2.3 Repeat the operation of step 2.2 to treat the armature core slot for the second time, including vacuum varnishing and curing. The performance of the armature core slot after insulation treatment is shown in Table 1;

[0070] Step 3: Overall insulation treatment of armature

[0071] 3.1 Use diluent xylene to adjust the viscosity of the inorganic ceramic insulating paint. Use a Tu-4 viscometer to test the viscosity of the paint liquid. After the value is 40s, it is ready for use. The viscosity of the inorganic ceramic insulating paint is 40s, and the linear expansion coefficient is 10×10 -6 / ℃, temperature resistance ≥450℃;

[0072] 3.2 The mica insulation end plates are bonded to both ends of the armature core with inorganic adhesives, and the inorganic ceramic high-temperature enameled wire with a temperature resistance of not less than 450°C is used for single-wire winding. Each phase winding consists of 6 coil elements connected in series, each element has 18 turns, and the ends of each phase winding are welded together by high-frequency heating with silver-lead solder, and the neutral line is not led out;

[0073] 3.3 Place the armature in the paint dipping container in the air, pour inorganic ceramic insulating paint into the paint dipping container, and the process liquid level should be more than 50mm above the highest point of the armature; place the paint dipping container in a vacuum drying oven, set the vacuum degree to 1500Pa, the temperature to 28℃, and the time to 12min, and start the vacuum drying oven for vacuum dipping; after vacuum dipping, wipe the excess paint liquid with a dust-free cloth, and then place it in a muffle furnace for curing. After curing, cool it down to below 150℃ with the furnace and take it out; the curing adopts stage heating The thermal mode is specifically 80℃ / 2h+150℃ / 2h+250℃ / 2h+350℃ / 2h+450℃ / 2h, and the heating rate of each temperature section is 10℃ / min; low-temperature treatment is carried out at 80℃~150℃ to ensure that the diluent and water in the inorganic ceramic insulating paint are fully volatilized, accelerate the film-forming effect, and gradually increase the temperature to 250℃ to fully volatilize the trace crystalline water in the filler in the insulating paint, and finally sinter the dispersed phases at high temperature to improve the density and continuity of the insulating coating.

[0074] 3.4 Repeat the operation in step 3.3 to treat the armature as a whole for the second time, including vacuum dipping and curing. The performance of the armature as a whole after insulation treatment is shown in Table 1.

[0075] Example 2

[0076] An integrated insulation treatment method for a 450°C resistant motor armature comprises the following steps:

[0077] Step 1: Armature core pretreatment

[0078] 1.1 Use 50WW310 silicon steel strip to punch 24-tooth armature punchings, stack them, and the stacking coefficient is not less than 98%. The length of the armature core is (37±0.1) mm. The inner and outer circles of the armature core are evenly welded in 8 passes by laser welding process;

[0079] 1.2 Place the armature core obtained in step 1.1 in a vacuum furnace, and degrease the armature core in a staged heating method, wherein the staged heating method is 120°C / 2h+180°C / 2h+250°C / 2h+350°C / 2h+450°C / 2h, and the heating rate of each temperature section is 10°C / min;

[0080] 1.3 The armature core obtained in step 1.2 is subjected to plasma cleaning, the plasma cleaning gas is CDA, and the time is 15s;

[0081] Step 2: Insulation treatment of armature core slots

[0082] 2.1 Use diluent xylene to adjust the viscosity of the inorganic ceramic insulating paint, and use a Tu-4 viscometer to test the viscosity of the paint for 30s, and then set it aside; the viscosity of the inorganic ceramic insulating paint is 30s, and the linear expansion coefficient is 15×10 -6 / ℃, temperature resistance ≥450℃;

[0083] 2.2 Protect the inner and outer circles of the armature core obtained in step 1 with 3M tape, suspend the armature core slot in a paint immersion container, pour inorganic ceramic insulating paint into the paint immersion container, and the process liquid level should be more than 50mm above the highest point of the armature core slot; place the paint immersion container in a vacuum drying oven, set the vacuum degree to 2500Pa, the temperature to 30°C, and the time to 8min, and start the vacuum drying oven for vacuum immersion; after vacuum immersion, place the armature core in a muffle furnace for curing, and after curing, cool it down to below 150°C with the furnace and take it out; the curing adopts a stage heating mode, specifically 80°C / 2h+150°C / 2h+250°C / 2h+350°C / 2h+450°C / 2h, and the heating rate of each temperature section is 15°C / min;

[0084] 2.3 Repeat the operation of step 2.2 to treat the armature core slot for the second time, including vacuum varnishing and curing. The performance of the armature core slot after insulation treatment is shown in Table 1;

[0085] Step 3: Overall insulation treatment of armature

[0086] 3.1 Use diluent xylene to adjust the viscosity of the inorganic ceramic insulating paint, and use a Tu-4 viscometer to test the viscosity of the paint liquid. After 50s, it is ready for use; the viscosity of the inorganic ceramic insulating paint is 50s, and the linear expansion coefficient is 15×10 -6 / ℃, temperature resistance ≥450℃;

[0087] 3.2 The mica insulation end plates are bonded to both ends of the armature core with inorganic adhesives, and the 600℃ resistant inorganic ceramic high temperature enameled wire is used for single wire winding. Each phase winding consists of 8 coil elements connected in series, each element has 24 turns, and the ends of each phase winding are welded together by high frequency heating with silver-lead solder, and the neutral line is not led out;

[0088] 3.3 Suspend the armature in the impregnating varnish container, pour inorganic ceramic insulating varnish into the impregnating varnish container, and the process liquid level should be more than 50 mm above the highest point of the armature; place the impregnating varnish container in a vacuum drying oven, set the vacuum degree to 2000 Pa, the temperature to 30 °C, and the time to 15 min, and start the vacuum drying oven for vacuum impregnation; after vacuum impregnation, wipe off the excess varnish with a lint-free cloth, then place it in a muffle furnace for curing. After curing is completed, cool it down with the furnace to below 150 °C and take it out; the curing adopts a stage heating mode, specifically 80 °C / 2 h + 150 °C / 2 h + 250 °C / 2 h + 350 °C / 2 h + 450 °C / 2 h, and the heating rate for each temperature section is 15 °C / min;

[0089] 3.4 Repeat the operation in step 3.3 to perform the second and third treatments on the whole armature; the performance after the overall insulation treatment of the armature is shown in Table 1.

[0090] Comparative Example 1

[0091] An integrated insulation treatment method for a 450 °C-resistant motor armature includes the following steps:

[0092] Step 1 Armature core pretreatment

[0093] 1.1 Use 50WW310 silicon steel strip to stamp 24-tooth armature punching sheets, stack them, and the stacking coefficient is not less than 98%. The length of the armature core is (37 ± 0.1) mm, and 8 equally distributed welds are made on the inner and outer circles of the armature core through a laser welding process;

[0094] 1.2 Place the armature core obtained in step 1.1 in a vacuum furnace and perform degreasing treatment on the armature core in a stage heating manner. The stage heating manner is 120 °C / 2 h + 180 °C / 2 h + 250 °C / 2 h + 350 °C / 2 h + 450 °C / 2 h, and the heating rate for each temperature section is 10 °C / min;

[0095] 1.3 Perform plasma cleaning treatment on the armature core obtained in step 1.2. The gas for plasma cleaning is CDA, and the time is 15 s;

[0096] Step 2 Armature core slot insulation treatment

[0097] 2.1 Use the ZS-1091 600 °C high-temperature resistant ceramic insulating coating prepared by inorganic-organic graft modification to replace the inorganic ceramic insulating varnish, adjust the viscosity with the diluent xylene, and after testing the viscosity value of the varnish liquid with a coating-4 viscometer to be 30 s, set it aside;

[0098] 2.2 Protect the inner and outer circles of the armature core obtained in Step 1 with 3M tape, suspend the armature core slots in the dipping container, pour ZS-1091 high-temperature ceramic insulation paint resistant to 600 °C into the dipping container, and the process liquid level should exceed the highest point of the armature core slots by more than 50 mm; place the dipping container in a vacuum drying oven, set the vacuum degree to 2500 Pa, the temperature to 30 °C, and the time to 8 min, and start the vacuum drying oven for vacuum dipping; after vacuum dipping, place the armature core in an oven for curing, and after curing, cool it down with the furnace to below 50 °C and take it out; the curing adopts a stage heating mode, specifically room temperature / 72 h + 150 °C / 2 h;

[0099] 2.3 Repeat the operation in Step 2.2 to perform the second treatment on the armature core slots, including vacuum dipping and curing. The performance after the insulation treatment of the armature core slots is shown in Table 1.

[0100] Table 1 Performance of the armature core and armature after insulation treatment

[0101]

Claims

1. An integrated insulation treatment method for a motor armature resistant to 450 °C, characterized in that, It includes the following steps: Step 1: Pretreatment of the armature core Take the stacked armature core and carry out degreasing treatment by means of staged heating, and then carry out atmospheric plasma cleaning treatment on the degreased armature core; The staged heating method is to carry out heat preservation treatment at 115 - 125°C, 175 - 185°C, 245 - 255°C, 245 - 355°C, and 445 - 455°C for 1.8 - 2.2 h in sequence, and the heating rate for each temperature section is (5 - 10)°C / min; Step 2: Insulation treatment of the armature core slots Protect the inner and outer circles of the armature core with tape, and then carry out vacuum impregnation of the armature core with inorganic ceramic insulating paint 2 - 3 times. After the vacuum impregnation is completed, carry out baking and curing on the armature core by means of staged heating; The staged heating method is to carry out heat preservation treatment at 75 - 85°C, 145 - 155°C, 245 - 255°C, 345 - 355°C, and 445 - 455°C for 1.8 - 2.2 h in sequence, and the heating rate for each temperature section is (10 - 15)°C / min; Step 3: Overall insulation treatment of the armature Wind the armature core with inorganic ceramic high-temperature electromagnetic wire, and weld the common points of the windings with silver-copper solder by means of high-frequency heating. Then carry out vacuum impregnation of the armature with inorganic ceramic insulating paint 2 - 3 times; after the vacuum impregnation of the armature is completed, carry out baking and curing on the armature core by means of staged heating, so that the inorganic ceramic insulating paint is sintered together with the windings to form a ceramicized insulation layer; The staged heating method is to carry out heat preservation treatment at 75 - 85°C, 145 - 155°C, 245 - 255°C, 345 - 355°C, and 445 - 455°C for 1.8 - 2.2 h in sequence, and the heating rate for each temperature section is (10 - 15)°C / min.

2. The integrated insulation treatment method for a motor armature resistant to 450°C as described in claim 1, wherein The process parameters of the plasma cleaning are: the atmosphere is compressed air and the time is 15 s.

3. The integrated insulation treatment method for a motor armature resistant to 450 °C as described in claim 1, characterized in that, In step two, the viscosity of the inorganic ceramic insulating paint is 20 to 30 s, the linear expansion coefficient is (10 to 15) × 10 -6 / °C, and the temperature resistance is ≥ 450 °C.

4. The integrated insulation treatment method for a motor armature resistant to 450 °C as claimed in claim 1, wherein, In step three, the viscosity of the inorganic ceramic insulating paint is 40 to 50 s, the linear expansion coefficient is (10 to 15)×10 -6 / °C, and the temperature resistance is ≥450°C.

5. The integrated insulation treatment method for a motor armature resistant to 450 °C as described in claim 1, characterized in that, In Step 2, the process parameters of the vacuum impregnation are: the vacuum degree is 2000 Pa - 3000 Pa, the temperature is 25°C - 35°C, and the time is 5 min - 10 min.

6. The integrated insulation treatment method for a 450°C-resistant motor armature as described in claim 1, characterized in that, In Step 3, the process parameters of the vacuum impregnation are: the vacuum degree is 1500 Pa - 2500 Pa, the temperature is 25°C - 35°C, and the time is 10 min - 15 min.

7. The integrated insulation treatment method for a motor armature resistant to 450 °C as described in claim 1, characterized in that, The minimum bending radius performance of the inorganic ceramic high-temperature electromagnetic wire ≥ 7 times the outer diameter of the electromagnetic wire.

8. The integrated insulation treatment method for a motor armature resistant to 450 °C as described in claim 1, characterized in that, The inorganic ceramic high-temperature electromagnetic wire has the characteristic of high temperature resistance, and the lowest temperature of high temperature resistance is 450°C.

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