CN115528877A - Integrated insulation treatment method for motor armature resistant to 450 DEG C - Google Patents

Integrated insulation treatment method for motor armature resistant to 450 DEG C Download PDF

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CN115528877A
CN115528877A CN202211357711.5A CN202211357711A CN115528877A CN 115528877 A CN115528877 A CN 115528877A CN 202211357711 A CN202211357711 A CN 202211357711A CN 115528877 A CN115528877 A CN 115528877A
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temperature
armature
armature core
inorganic ceramic
paint
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史培建
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Guizhou Aerospace Linquan Motor Co Ltd
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Guizhou Aerospace Linquan Motor Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
    • H02K15/026—Wound cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/10—Applying solid insulation to windings, stators or rotors

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

The invention belongs to the field of motor processing and manufacturing, in particular to an integrated insulation treatment method of a motor armature resistant to 450 ℃, which comprises the following steps of 1, carrying out oil removal treatment on an armature core by adopting a stage heating mode, and effectively improving the adhesive force between inorganic ceramic insulating paint and the iron core; 2. after the armature core slot is vacuum-varnished, baking and curing are carried out by adopting a heating mode, so that the compactness of the insulating coating and the continuity of the iron core winding are improved; 3. baking and curing the armature core winding and the vacuum paint dipping in a heating mode to sinter the inorganic ceramic insulating paint and the winding together to form an inorganic ceramic insulating layer; the motor armature manufactured by the method has excellent high temperature resistance and temperature change resistance, and meets the requirement of the motor on operation at the high temperature of 450 ℃.

Description

Integrated insulation treatment method for motor armature resistant to 450 DEG C
Technical Field
The invention belongs to the field of motor processing and manufacturing, and particularly relates to an integrated insulation treatment method for a motor armature resistant to 450 ℃.
Background
With the increasing development of new generation missile, torpedo and "TBCC" engine, etc., the power equipment-generator is required to have small volume, high rotation speed, high power density, high insulation stability, etc. and stable running time of not less than 100 hr at 450 deg.c. The armature is the heart of the generator and is one of the key structures of the generator, and the performance of the armature directly influences the stability and the reliability of the motor. The armature generally comprises an armature core, a magnet wire and an insulating material, wherein the insulating material is generally an organic insulating material, the service temperature of the armature is limited below 220 ℃, and obviously the service requirement of a high-temperature high-speed generator with the temperature of 450 ℃ cannot be met. Therefore, the research on the insulation treatment process method of the motor armature with 450 ℃ resistance is of great significance.
The Chinese invention patent CN106549541B discloses a high temperature motor armature insulation treatment process, wherein an armature core and an armature both adopt 400 ℃ high temperature motor impregnating varnish, the varnish is organic silicon modified epoxy varnish added with superfine ceramic micro-peaks and glass powder, and the prepared armature can meet the 400 ℃ high temperature requirement.
Chinese utility model CN215009806 discloses that the coil is encapsulated by using a mixture of nano quartz powder and silicone resin, and after curing, the winding can endure 500 ℃, but the stable operation temperature of the motor does not exceed 350 ℃.
The analysis of the prior art shows that the high-temperature motor insulation system can be divided into two types, one type is an insulation system which takes an organic material as a main body and has the limit tolerance temperature not exceeding 260 ℃, the other type is an organic-inorganic insulation system which is based on a high-temperature-resistant organic insulator system and is prepared by adopting an inorganic binder and an inorganic filler, the tolerance temperature can not exceed 400 ℃, the two technical systems are not separated from the category of the organic insulation system, the armature insulation with the temperature resistance grade of more than 350 ℃ is mostly guided by an organic silicon modified coating, and the scheme for realizing the high-temperature resistance of the armature by the process improvement of dipping or coating an insulating paint is less.
Although the invention of Chinese patent CN103607087A discloses a process for reinforcing the insulation treatment of a motor winding, which adopts a hot air flow-vacuum-hot air flow composite drying process to separate the volatilization of a solvent and the oxidative polymerization of resin and dry oil in a binder, avoids the mutual interference and restriction, uses an advanced composite vacuum impregnation dryer and 1038 melamine alcohol acid impregnating varnish with excellent performance, and recycles the volatilized solvent through white blank pre-drying vacuum dehumidification, primary vacuum impregnation, primary vacuum drying high-temperature curing, secondary vacuum impregnation, secondary vacuum drying high-temperature curing, 8363 melamine epoxy ash enamel paint spraying and high-temperature drying curing procedures and condensation.
Although the chinese invention patent CN104485767B discloses an insulating structure of a stator coil of a high-voltage motor and a dipping and curing process thereof, the voltage level of the coil insulation is 6kV level, the coil is in a strip structure, 240-level aromatic polyimide enameled flat copper wires are selected as folded wires, and each turn of wire is half-overlapped and wrapped by two layers of polyimide film glass cloth glue-less powder mica tapes as an inter-turn insulating layer; the semi-lapped four-layer polyimide film glass cloth dry mica tape is used as a main insulation layer of the coil, the outermost layer is semi-lapped and wrapped with an ET100-25 glass ribbon as a protective layer, VPI vacuum pressure impregnation and curing are carried out on the coil by using organic silicon solvent-free impregnating resin, the impregnated and cured coil is subjected to an insulation structure thermal evaluation test according to the standard GB/T17948, the temperature resistance index of the insulation structure is 244 ℃, the temperature resistance grade is 220 grade, and the maximum operation temperature in the 60-year operation life reaches 191 ℃; however, the technical scheme still does not separate from organic materials, and the operating temperature of the technical scheme cannot reach 450 ℃.
In conclusion, in the prior art, the service life of the high-temperature insulating paint at 450 ℃ is not reported, and the requirement of the motor for operation at 450 ℃ is difficult to meet, so that the research on an insulating method capable of meeting the requirement of the motor for operation at 450 ℃ is very important.
Disclosure of Invention
The invention provides an integrated insulation treatment method of a motor armature resistant to 450 ℃ aiming at the defects of the prior art.
The method is realized by the following technical scheme:
an integrated insulation treatment method of a motor armature resistant to 450 ℃ comprises the following steps:
step one armature core pretreatment
Degreasing the stacked armature core by adopting a staged heating mode, and then carrying out atmospheric plasma cleaning treatment on the degreased armature core;
the stage heating mode is that the heat preservation treatment is carried out for 1.8 to 2.2 hours at 115 to 125 ℃, 175 to 185 ℃, 245 to 255 ℃, 245 to 355 ℃ and 445 to 455 ℃ in sequence, and the heating speed of each temperature section is (5 to 10) DEG C/min;
step two armature core slot insulation treatment
Protecting the inner circle and the outer circle of the armature core by using an adhesive tape, then carrying out vacuum dip coating on the armature core slot for 2-3 times by using inorganic ceramic insulating paint, and after the vacuum dip coating is finished, baking and curing the armature core slot by using a stage heating mode;
the stage heating mode is that the heat preservation treatment is carried out for 1.8 to 2.2 hours at the temperature of 75 to 85 ℃, 145 to 155 ℃, 245 to 255 ℃, 345 to 355 ℃ and 445 to 455 ℃ in sequence, and the temperature rise speed of each temperature section is (10 to 15) ° C/min.
Step three armature integral insulation treatment
Winding an armature core by using an inorganic ceramic high-temperature electromagnetic wire, welding common points by using silver-lead solder in a high-frequency heating mode, and then performing vacuum paint dipping on the armature for 2-3 times by using inorganic ceramic insulating paint; after the vacuum impregnation of the armature is finished, baking and curing the armature core in a stage heating mode, so that the inorganic ceramic insulating paint and the winding are sintered together to form a ceramic insulating layer;
the stage heating mode is that the heat preservation treatment is carried out for 1.8 to 2.2 hours at the temperature of 75 to 85 ℃, 145 to 155 ℃, 245 to 255 ℃, 345 to 355 ℃ and 445 to 455 ℃ in sequence, and the temperature rise speed of each temperature section is (10 to 15) ° C/min.
The stacked armature core is formed by stamping a stamped piece by using silicon steel sheets, stacking the stamped piece into the armature core and performing laser welding on the outer circle of the armature core and the inner teeth of the armature core.
The plasma cleaning process parameters are as follows: the atmosphere was compressed air (CDA) for 15s.
In the second step, the viscosity of the inorganic ceramic insulating paint is 20-30 s, so as to ensure that the paint liquid forms a uniform paint layer in the armature core slot without high points.
In the third step, the viscosity of the inorganic ceramic insulating paint is 40-50 s, so as to ensure the permeability of paint liquid among windings and in the winding and armature core slots and the paint coating amount.
The inorganic ceramic insulating paint is a commercial product.
After the inorganic ceramic insulating paint is cured, the linear expansion coefficient is (10-15) multiplied by 10 -6 Temperature is more than or equal to 450 ℃.
In the second step, the technological parameters of the vacuum dipping paint are that the vacuum degree is 2000 Pa-3000 Pa, the temperature is 25-35 ℃, and the time is 5-10 min.
In the third step, the technological parameters of the vacuum dipping paint are that the vacuum degree is 1500 Pa-2500 Pa, the temperature is 25 ℃ -35 ℃, and the time is 10 min-15 min.
The minimum bending radius performance of the inorganic ceramic high-temperature electromagnetic wire is not less than 7 times of the outer diameter of the electromagnetic wire.
The inorganic ceramic high-temperature electromagnetic wire has the characteristic of high temperature resistance, and the minimum temperature of the high temperature resistance is 450 ℃.
The thickness of the insulating layer of the inorganic ceramic high-temperature electromagnetic wire is 0.01 mm-0.05 mm.
The inorganic ceramic high-temperature electromagnetic wire is a high-temperature electromagnetic wire which is sintered on the surface layer of a conductor after an inorganic ceramic material is subjected to high-temperature treatment.
The conductor is a nickel-plated copper wire.
The key points of the invention are as follows: 1. the armature core is degreased by adopting a staged heating mode, so that the adhesive force between the inorganic ceramic insulating paint and the iron core is effectively improved; 2. after the armature core slot is vacuum-varnished, baking and curing are carried out by adopting a heating mode, so that the compactness of the insulating coating and the continuity of the iron core winding are improved; 3. baking and curing the armature core winding and the vacuum paint dipping in a heating mode to sinter the inorganic ceramic insulating paint and the winding together to form an inorganic ceramic insulating layer; the motor armature manufactured by the method has excellent high temperature resistance and temperature change resistance, and meets the requirement of the motor on operation at the high temperature of 450 ℃. 4. Limiting the linear expansion coefficient of the inorganic ceramic insulating paint to be (10-15) multiplied by 10 -6 The phenomenon that the insulating paint falls off and cracks and the like can be avoided when the operating temperature of the motor armature is more than or equal to 450 ℃ or when the motor armature recovers the non-operating state. When the linear expansion coefficient is less than 10 x 10 -6 The rigidity of a paint film is increased after the insulating paint is cured, the matching of the linear expansion coefficient of the paint film with the linear expansion coefficients of the iron core and the high-temperature electromagnetic wire is poor, and the paint film can crack after high-temperature and low-temperature aging; and when the linear expansion coefficient is higher than 15 multiplied by 10 -6 The toughness of a paint film is increased after the insulating paint is cured, the matching performance of the linear expansion coefficient of the paint film with the linear expansion coefficient of the iron core and the high-temperature electromagnetic wire is poor, and the paint film is cracked due to the expansion of the paint film after high-temperature and low-temperature aging.
Has the advantages that:
the method can be used for the surface insulation treatment of the armature of the motor with the operation temperature of 450 ℃, and the treated armature has excellent high temperature resistance and temperature change resistance;
wherein the high temperature resistance is characterized in that:
1. the motor armature treated by the insulation method of the invention is aged for 100h at the high temperature of 450 ℃, and the insulation performance is not invalid.
2. The insulation resistance of the motor armature treated by the insulation method meets the requirements of no surface arcing and breakdown phenomena under the normal atmospheric environment, the alternating voltage of 1000V and 50Hz and the duration of 1min, and the leakage current is not more than 5mA under the normal atmospheric environment.
3. The dielectric strength of the motor armature treated by the insulation method meets the requirement that the resistance is not less than 2000M omega at the temperature of 450 ℃.
4. The service life of the motor armature treated by the insulation method of the invention reaches 100h at 450 ℃.
The temperature change resistance is shown as follows: after the motor armature treated by the insulation method is treated by the temperature of-60-450 ℃ and the high and low temperatures are respectively preserved for 1h for 10 periods, a paint film is complete and no cracking phenomenon occurs.
In conclusion, the motor armature treated by the insulation method can meet the requirements of a TBCC engine on high temperature, high speed and high power density.
Drawings
FIG. 1: a sample of the armature core slot of example 1 after insulation treatment;
FIG. 2: a sample of the armature core slot of example 2 after insulation treatment;
FIG. 3: the invention relates to a sample diagram after integrated insulation treatment of armature ceramic.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
An integrated insulation treatment method of a motor armature resistant to 450 ℃ comprises the following steps:
step one armature core pretreatment
1.1, punching a punching sheet by adopting a silicon steel sheet, stacking the punching sheet into an armature core, and performing laser welding on the outer circle of the armature core and the inner teeth of the armature core to improve the dimensional stability of the armature core;
1.2, taking the stacked armature core, and performing oil removal treatment in a stage heating mode; the stage heating mode is that firstly the temperature is kept at 115-125 ℃ for 1.8-2.2 h, the temperature is kept at 175-185 ℃ for 1.8-2.2 h, the temperature is kept at 245-255 ℃ for 1.8-2.2 h, then the temperature is kept at 345-355 ℃ for 1.8-2.2 h, and finally the temperature is kept at 445-455 ℃ for 1.8-2.2 h, which is abbreviated as: (120 +/-5) ° C/h (2 +/-0.2) + (180 +/-5) ° C/h (2 +/-0.2) + (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 of each temperature section is (5-10) ° C/min; the invention removes oil in a staged heating mode in the iron core pretreatment process, ensures that punching oil between punching sheets is thoroughly discharged, and avoids reducing the adhesive force between the inorganic ceramic insulating paint and the iron core when the punching oil volatilizes at high temperature;
1.3, carrying out plasma cleaning treatment on the deoiled armature core by using compressed air, wherein the treatment time is 15s; according to the invention, the surface activation energy of the armature core can be reduced by adopting atmospheric plasma treatment, and the bonding effect between the inorganic ceramic insulating paint and the iron core is improved;
step two armature core slot insulation treatment
Protecting the inner and outer circles of the armature core by using an adhesive tape, and then adopting a viscosity of 20 to up to 35 ℃ under the conditions that the vacuum degree is 2000-3000 Pa and the temperature is 25-35 DEG C30s and linear expansion coefficient of (10-15) x 10 -6 Carrying out vacuum dip coating on the armature iron core slot for 5-10 min by using inorganic ceramic insulating paint with temperature resistance of more than or equal to 450 ℃, carrying out vacuum dip coating for 2-3 times in total, and baking and curing the armature iron core slot by adopting a stage heating mode after the vacuum dip coating is finished; the stage heating mode is that the temperature is firstly increased to 75-85 ℃ and then is preserved for 1.8-2.2 h, the temperature is increased to 145-155 ℃ and then is preserved for 1.8-2.2 h, the temperature is increased to 245-255 ℃ and then is preserved for 1.8-2.2 h, then the temperature is increased to 345-355 ℃ and then is preserved for 1.8-2.2 h, and finally the temperature is increased to 445-455 ℃ and then is preserved for 1.8-2.2 h, which is abbreviated as: (80 +/-5) ° C/h (2 +/-0.2) + (150 +/-5) ° C/h (2 +/-0.2) + (250 +/-5) ° C/2 +/-0.2) h + (350 +/-5) ° C/2 +/-0.2) h + (450 +/-5) ° C/2 +/-0.2) h, and the heating speed of each temperature section is (10-15) ° C/min; the method adopts a heating mode to bake and solidify the iron core groove, carries out low-temperature treatment at 80-150 ℃, ensures that the diluent and water in the inorganic ceramic insulating paint are fully volatilized, accelerates the film forming effect, gradually raises the temperature to 245-255 ℃, fully volatilizes trace crystal water in the filler in the insulating paint, and finally sinters various disperse phases at high temperature, thereby improving the compactness and the continuity of the insulating coating;
three-step armature integral insulation treatment
Winding the armature core with inorganic ceramic high-temperature electromagnetic wire with temperature resistance higher than or equal to 450 deg.c, welding the common winding point with silver-copper solder in high-frequency heating mode, and welding at 25-35 deg.c and vacuum degree of 1500-2500 Pa to obtain the product with viscosity of 40-50 s and linear expansion coefficient of 10-15 x 10 -6 Carrying out vacuum dip coating on the armature for 10-15 min by using inorganic ceramic insulating paint with temperature resistance of more than or equal to 450 ℃, and carrying out vacuum dip coating for 2-3 times in total; after the vacuum impregnating of the armature is finished, baking and curing the armature core in a stage heating mode to sinter the inorganic ceramic insulating paint and the winding together to form a ceramic insulating layer; the stage heating mode is that the temperature is firstly increased to 75-85 ℃ and is preserved for 1.8-2.2 h, the temperature is increased to 145-155 ℃ and is preserved for 1.8-2.2 h, the temperature is increased to 245-255 ℃ and is preserved for 1.8-2.2 h, the temperature is increased to 345-355 ℃ and is preserved for 1.8-2.2 h, and finally the temperature is increased to 445-455 ℃ and is preserved for 1.8-2.2 h, which is abbreviated as: (80 + -5) ° C/(2 + -0.2) h + (150 + -C)5) The temperature rise speed of each temperature section is (10-15) ° C/min; according to the invention, after vacuum impregnation of the armature, the armature is baked and cured by heating, so that the inorganic ceramic insulating paint and the winding are sintered together to form a ceramic insulating layer.
The minimum bending radius performance of the inorganic ceramic high-temperature electromagnetic wire with the temperature resistance of not less than 450 ℃ is not less than 7 times of the outer diameter of the electromagnetic wire.
The inorganic ceramic high-temperature electromagnetic wire capable of resisting temperature of not less than 450 ℃ is a high-temperature electromagnetic wire which is sintered on the surface layer of a conductor after inorganic ceramic materials are subjected to high-temperature treatment.
The conductor is a nickel-plated copper wire.
Example 1
An integrated insulation treatment method of a motor armature resistant to 450 ℃, comprising the following steps:
step one armature core pretreatment
1.1, punching 18-tooth armature punching sheets by adopting 50WW310 silicon steel strips, stacking, wherein the stacking coefficient is not less than 98%, the length of an armature core is (25 +/-0.1) mm, and performing 6-channel uniform welding on the inner circle and the outer circle of the armature core by a laser welding process;
1.2, placing the armature core obtained in the step 1.1 in a vacuum furnace, and treating stamping oil remained on the surface of the armature sheet according to a stage heating mode; the stage heating mode is 120 ℃/2h +180 ℃/2h +250 ℃/2h +350 ℃/2h +450 ℃/2h, and the heating speed of each temperature stage is 5 ℃/min; at the temperature of 120-180 ℃, the punching oil begins to burn, decompose and volatilize; continuously heating from 180 ℃ to 250 ℃ to completely decompose and volatilize the punching oil; continuously heating from 250 ℃ to 350 ℃ to ensure that volatile matters of the punching oil are difficult to start carbonization; continuously heating from 350 ℃ to 450 ℃ to ensure that volatile matters in the punching oil are difficult to completely carbonize;
1.3, carrying out plasma cleaning treatment on the armature core obtained in the step 1.2, wherein the gas of the plasma cleaning is CDA and the time is 15s;
step two armature core slot insulation treatment
2.1 adjusting the viscosity of the inorganic ceramic insulating varnish by using a diluent xyleneCoating a 4 viscometer to test the viscosity value of the paint liquid to be 20s for later use; the viscosity of the inorganic ceramic insulating paint is 20s, and the linear expansion coefficient is 10 multiplied by 10 -6 The temperature is more than or equal to 450 ℃;
2.2 protecting the inner circle and the outer circle of the armature core obtained in the step one by using a 3M adhesive tape, suspending the armature core groove in a paint dipping container, pouring inorganic ceramic insulating paint into the paint dipping container, wherein the process liquid level is over 50mm above the highest point of the armature core groove; placing the paint dipping container in a vacuum drying oven, setting the vacuum degree to be 2000Pa, the temperature to be 28 ℃ and the time to be 6min, and starting the vacuum drying oven to carry out vacuum paint dipping; after vacuum paint dipping, placing the armature core in a muffle furnace for curing, cooling the armature core to below 150 ℃ along with the furnace after the curing is finished, and taking out the armature core; the curing adopts a stage heating mode, specifically 80 ℃/2h +150 ℃/2h +250 ℃/2h +350 ℃/2h +450 ℃/2h, and the temperature rise speed of each temperature stage is 10 ℃/min; low-temperature treatment is carried out at 80-150 ℃, so that the diluent and water in the inorganic ceramic insulating paint are fully volatilized, the film forming effect is accelerated, the temperature is gradually raised to 250 ℃, trace crystal water in the filler is fully volatilized in the insulating paint, and finally, each disperse phase is sintered at high temperature, so that the compactness and the continuity of the insulating coating are improved;
2.3, repeating the operation of the step 2.2 to carry out second treatment on the armature core slot, wherein the second treatment comprises vacuum paint dipping and curing, and the performance of the armature core slot after insulation treatment is shown in table 1;
step three armature integral insulation treatment
3.1, adjusting the viscosity of the inorganic ceramic insulating paint by using a diluent xylene, and testing the viscosity value of a paint liquid by using a paint-4 viscometer to be 40s for later use; the viscosity of the inorganic ceramic insulating paint is 40s, and the linear expansion coefficient is 10 multiplied by 10 -6 Temperature resistance is more than or equal to 450 ℃;
3.2 adhering mica insulation end plates to two ends of the armature core by using an inorganic adhesive, winding by using an inorganic ceramic high-temperature enameled wire with temperature resistance of not less than 450 ℃ according to a single-wire winding mode, wherein each phase of winding is formed by connecting 6 coil elements in series, each element has 18 turns, the tail end of each phase of winding is welded together by adopting silver-lead solder in a high-frequency heating mode, and the central wire is not led out;
3.3 suspending the armature in a paint dipping container, pouring inorganic ceramic insulating paint into the paint dipping container, wherein the process liquid level is not more than 50mm above the highest point of the armature; placing the paint dipping container in a vacuum drying oven, setting the vacuum degree to be 1500Pa, the temperature to be 28 ℃ and the time to be 12min, and starting the vacuum drying oven to carry out vacuum paint dipping; after vacuum paint dipping, wiping redundant paint liquid by using dust-free cloth, then placing the paint liquid in a muffle furnace for curing, cooling the paint liquid to below 150 ℃ along with the furnace after the curing is finished, and taking the paint liquid out; the curing adopts a stage heating mode, specifically 80 ℃/2h +150 ℃/2h +250 ℃/2h +350 ℃/2h +450 ℃/2h, and the temperature rise speed of each temperature stage is 10 ℃/min; low-temperature treatment is carried out at 80-150 ℃ to ensure that the diluent and the water in the inorganic ceramic insulating paint are fully volatilized, the film forming effect is accelerated, the temperature is gradually raised to 250 ℃, so that trace crystal water in the filler is fully volatilized in the insulating paint, and finally, each disperse phase is sintered at high temperature, so that the compactness and the continuity of the insulating coating are improved
3.4 repeating the operation of the step 3.3 to carry out the second treatment on the whole armature, wherein the second treatment comprises vacuum dipping and curing, and the performance of the whole armature after the insulation treatment is shown in the table 1.
Example 2
An integrated insulation treatment method of a motor armature resistant to 450 ℃ comprises the following steps:
step one armature core pretreatment
1.1 stamping 24-tooth armature punching sheets by adopting 50WW310 silicon steel strips, stacking, wherein the stacking coefficient is not less than 98%, the length of an armature core is (37 +/-0.1) mm, and performing 8-channel uniform welding on the inner circle and the outer circle of the armature core by a laser welding process;
1.2 placing the armature core obtained in the step 1.1 in a vacuum furnace, and carrying out oil removal treatment on the armature core according to a stage temperature rise mode, wherein the stage temperature rise mode is 120 ℃/2h +180 ℃/2h +250 ℃/2h +350 ℃/2h +450 ℃/2h, and the temperature rise speed of each temperature stage is 10 ℃/min;
1.3, carrying out plasma cleaning treatment on the armature core obtained in the step 1.2, wherein the gas of the plasma cleaning is CDA and the time is 15s;
step two armature core slot insulation treatment
2.1 use of diluentsAdjusting the viscosity of the inorganic ceramic insulating paint by dimethylbenzene, and testing the viscosity value of paint liquid to be 30s by using a paint-4 viscometer for later use; the viscosity of the inorganic ceramic insulating paint is 30s, and the linear expansion coefficient is 15 multiplied by 10 -6 Temperature resistance is more than or equal to 450 ℃;
2.2 protecting the inner circle and the outer circle of the armature core obtained in the step one by using a 3M adhesive tape, suspending the armature core groove in a paint dipping container, pouring inorganic ceramic insulating paint into the paint dipping container, wherein the process liquid level is over 50mm above the highest point of the armature core groove; placing the dip coating container in a vacuum drying oven, setting the vacuum degree to be 2500Pa, the temperature to be 30 ℃ and the time to be 8min, and starting the vacuum drying oven to carry out vacuum dip coating; after vacuum dip coating, placing the armature core in a muffle furnace for curing, cooling the armature core to below 150 ℃ along with the furnace after curing, and taking out the armature core; the curing adopts a mode of staged heating, specifically 80 ℃/2h +150 ℃/2h +250 ℃/2h +350 ℃/2h +450 ℃/2h, and the temperature rise speed of each temperature section is 15 ℃/min;
2.3, repeating the operation of the step 2.2 to carry out secondary treatment on the armature core slot, wherein the secondary treatment comprises vacuum paint dipping and curing, and the performance of the insulated armature core slot is shown in the table 1;
step three armature integral insulation treatment
3.1, adjusting the viscosity of the inorganic ceramic insulating paint by using a diluent dimethylbenzene, and testing the viscosity value of paint liquid to be 50s by using a paint-4 viscometer for later use; the viscosity of the inorganic ceramic insulating paint is 50s, and the linear expansion coefficient is 15 multiplied by 10 -6 Temperature resistance is more than or equal to 450 ℃;
3.2, adhering mica insulation end plates to two ends of the armature core by using an inorganic adhesive, winding by using a 600 ℃ resistant inorganic ceramic high-temperature enameled wire according to a single-wire winding mode, connecting each phase of winding in series by 8 coil elements, welding the tail ends of each phase of winding together by adopting silver-lead solder in a high-frequency heating mode, and leading out no central wire;
3.3 suspending the armature in a paint dipping container, pouring inorganic ceramic insulating paint into the paint dipping container, wherein the process liquid level is not more than 50mm above the highest point of the armature; placing the paint dipping container in a vacuum drying oven, setting the vacuum degree to be 2000Pa, the temperature to be 30 ℃ and the time to be 15min, and starting the vacuum drying oven to carry out vacuum paint dipping; after vacuum dipping, wiping redundant paint liquid by using dust-free cloth, then placing the paint liquid in a muffle furnace for curing, cooling the paint liquid to below 150 ℃ along with the furnace after the curing is finished, and taking the paint liquid out; the curing adopts a stage heating mode, specifically 80 ℃/2h +150 ℃/2h +250 ℃/2h +350 ℃/2h +450 ℃/2h, and the temperature rise speed of each temperature stage is 15 ℃/min;
3.4, repeating the operation of the step 3.3 to carry out the second and 3 rd processing on the whole armature; the performance of the armature after the whole insulation treatment is shown in table 1.
Comparative example 1
An integrated insulation treatment method of a motor armature resistant to 450 ℃, comprising the following steps:
step one armature core pretreatment
1.1, punching 24-tooth armature punching sheets by adopting 50WW310 silicon steel strips, stacking, wherein the stacking coefficient is not less than 98%, the length of an armature core is (37 +/-0.1) mm, and performing 8-channel uniform welding on the inner circle and the outer circle of the armature core by a laser welding process;
1.2 placing the armature core obtained in the step 1.1 in a vacuum furnace, and carrying out oil removal treatment on the armature core according to a stage temperature rise mode, wherein the stage temperature rise mode is 120 ℃/2h +180 ℃/2h +250 ℃/2h +350 ℃/2h +450 ℃/2h, and the temperature rise speed of each temperature stage is 10 ℃/min;
1.3, carrying out plasma cleaning treatment on the armature core obtained in the step 1.2, wherein the gas of the plasma cleaning is CDA and the time is 15s;
step two armature core slot insulation treatment
2.1 replacing inorganic ceramic insulating paint with ZS-1091600 ℃ high-temperature resistant ceramic insulating paint prepared by inorganic-organic grafting modification, adjusting the viscosity by using a diluent xylene, and testing the viscosity value of paint liquid to be 30s by using a paint-4 viscometer for later use;
2.2 protecting the inner circle and the outer circle of the armature core obtained in the first step by using a 3M adhesive tape, suspending the armature core groove in the air, placing the armature core groove in a paint dipping container, pouring ZS-1091600 ℃ high-temperature resistant ceramic insulating paint into the paint dipping container, and ensuring that the process liquid level does not exceed the highest point of the armature core groove by more than 50 mm; placing the paint dipping container in a vacuum drying oven, setting the vacuum degree to be 2500Pa, the temperature to be 30 ℃ and the time to be 8min, and starting the vacuum drying oven to carry out vacuum paint dipping; after vacuum paint dipping, placing the armature core in an oven for curing, cooling to below 50 ℃ along with the oven after curing, and taking out; the curing adopts a stage heating mode, specifically room temperature/72h +150 ℃/2h;
2.3 repeating the operation of the step 2.2 to carry out secondary treatment on the armature core slot, wherein the secondary treatment comprises vacuum paint dipping and curing, and the performance of the armature core slot after insulation treatment is shown in the table 1.
TABLE 1 armature core and performance after armature insulation treatment
Figure BDA0003920800060000151

Claims (8)

1. An integrated insulation treatment method for a motor armature resistant to 450 ℃ is characterized by comprising the following steps:
step one armature core pretreatment
Degreasing the stacked armature core by adopting a staged heating mode, and then carrying out atmospheric plasma cleaning treatment on the degreased armature core;
the stage heating mode is that the heat preservation treatment is carried out for 1.8 to 2.2 hours at 115 to 125 ℃, 175 to 185 ℃, 245 to 255 ℃, 245 to 355 ℃ and 445 to 455 ℃ in sequence, and the heating speed of each temperature section is (5 to 10) DEG C/min;
step two armature core slot insulation treatment
Protecting the inner circle and the outer circle of the armature core by using an adhesive tape, then carrying out vacuum dip coating on the armature core for 2-3 times by using inorganic ceramic insulating paint, and after the vacuum dip coating is finished, baking and curing the armature core by using a stage heating mode;
the stage heating mode is that the heat preservation treatment is carried out for 1.8 to 2.2 hours at the temperature of 75 to 85 ℃, 145 to 155 ℃, 245 to 255 ℃, 345 to 355 ℃ and 445 to 455 ℃ in sequence, and the temperature rise speed of each temperature section is (10 to 15) ° C/min.
Three-step armature integral insulation treatment
Winding on an armature core by adopting an inorganic ceramic high-temperature electromagnetic wire, welding common points of windings by adopting silver-copper welding flux in a high-frequency heating mode, and then carrying out vacuum paint dipping on the armature for 2-3 times by adopting inorganic ceramic insulating paint; after the vacuum impregnation of the armature is finished, baking and curing the armature core in a stage heating mode, so that the inorganic ceramic insulating paint and the winding are sintered together to form a ceramic insulating layer;
the stage heating mode is that the heat preservation treatment is carried out for 1.8 to 2.2 hours at the temperature of 75 to 85 ℃, 145 to 155 ℃, 245 to 255 ℃, 345 to 355 ℃ and 445 to 455 ℃ in sequence, and the temperature rise speed of each temperature section is (10 to 15) ° C/min.
2. The integrated insulation treatment method for the motor armature resistant to 450 ℃ according to claim 1, wherein the process parameters of the plasma cleaning are as follows: the atmosphere is compressed air, and the time is 15s.
3. The integrated insulation treatment method for motor armatures resistant to 450 ℃ as claimed in claim 1, wherein in the second step, the viscosity of the inorganic ceramic insulating paint is 20-30 s, and the linear expansion coefficient is (10-15) x 10 -6 Temperature is more than or equal to 450 ℃.
4. The integrated insulation treatment method for motor armatures resistant to 450 ℃ according to claim 1, wherein in the third step, the viscosity of the inorganic ceramic insulating paint is 40-50 s, and the linear expansion coefficient is (10-15) multiplied by 10 -6 The temperature is higher than or equal to 450 ℃.
5. The integrated insulation treatment method for the motor armature resistant to 450 ℃ as claimed in claim 1, wherein in the second step, the vacuum dip coating process parameters are that the vacuum degree is 2000 Pa-3000 Pa, the temperature is 25 ℃ -35 ℃, and the time is 5 min-10 min.
6. The integrated insulation treatment method for the motor armature resistant to 450 ℃ according to claim 1, characterized in that in the third step, the vacuum dipping process parameters are that the vacuum degree is 1500 Pa-2500 Pa, the temperature is 25 ℃ -35 ℃, and the time is 10 min-15 min.
7. The integrated insulation treatment method for the motor armature resistant to 450 ℃ according to claim 1, wherein the minimum bending radius performance of the inorganic ceramic high-temperature electromagnetic wire is not less than 7 times the outer diameter of the electromagnetic wire.
8. The integrated insulation treatment method for the motor armature with the temperature resistance of 450 ℃ according to claim 1, wherein the inorganic ceramic high-temperature electromagnetic wire has the characteristic of high temperature resistance, and the minimum temperature of the high temperature resistance is 450 ℃.
CN202211357711.5A 2022-11-01 2022-11-01 Integrated insulation treatment method for motor armature resistant to 450 DEG C Pending CN115528877A (en)

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