CN111064288A - Low-iron-loss automobile engine stator core and preparation process thereof - Google Patents
Low-iron-loss automobile engine stator core and preparation process thereof Download PDFInfo
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- CN111064288A CN111064288A CN201911312628.4A CN201911312628A CN111064288A CN 111064288 A CN111064288 A CN 111064288A CN 201911312628 A CN201911312628 A CN 201911312628A CN 111064288 A CN111064288 A CN 111064288A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/08—Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
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- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
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- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
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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
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention has proposed a low iron loss automobile engine stator core and its preparation method, the stator core is the multilayer structure, including silicon steel sheet body, reducing and losing the outer layer, protective paint layer designed sequentially from inside to outside, the silicon steel sheet body adopts the borosilicate steel sheet of rare earth, the thickness of the silicon steel sheet body is 0.28-0.30 mm; the loss-reducing outer layer is made of composite alloy material, and the thickness of the layer is 0.02-0.04 mm; the protective paint layer is compound impregnating varnish, the layer thickness is 0.04-0.08mm, the mechanical property and the corrosion resistance of the stator core are effectively improved by comprehensively improving and proportioning the body material of the silicon steel sheet of the stator core and surface layer treatment and protection, the stator core has excellent low iron loss rate, the hysteresis loss and the eddy current loss are respectively reduced by 22 percent and 19.3 percent, the comprehensive quality of the stator core is stronger, the economic benefit is effectively improved, and the service life is obviously prolonged.
Description
Technical Field
The invention relates to the technical field of engine stator cores, in particular to an automobile engine stator core with low iron loss and a preparation process thereof.
Background
The motor is used as power equipment and widely applied to various industries, particularly in the oil refining chemical industry, and is used as main driving equipment to drive the important links of oil path transportation, cooling circulation, blowing and lifting and the like of the whole oil refinery, so that the normal operation of the motor is ensured to be particularly important. In the using process, because the stator iron core of the alternating-current motor has poor quality or is damaged, the efficiency and the power factor are reduced, the temperature is increased due to local overheating of the iron core, even the armature winding of the whole motor is burnt in serious cases, and shutdown accidents such as short circuit and the like are caused. In the above accident problem, the stator core of the motor is a direct source of the problem, so how to improve the comprehensive quality of the stator core is always one of the popular researches in the industry.
The stator core is an important component for forming a motor magnetic flux loop and fixing a stator coil, and is formed into a whole by pressing a punching sheet and various fasteners. The stator core is mainly used for generating an excitation magnetic field and generating force action on a current conductor in the stator core. The stator core is generally made of a sheet of silicon steel, which is a silicon-containing (silicon is also called silicon) steel having a silicon content of 0.8-4.8%. The iron core of the transformer is made of silicon steel, because the silicon steel is a magnetic substance with strong magnetic conductivity, and in the electrified coil, the silicon steel can generate larger magnetic induction intensity, thereby reducing the volume of the transformer. The basic performance requirements of the stator core are good magnetic conductivity and low loss; the rigidity is good, and the vibration is good; the ventilation effect is good in structural arrangement; the sizes of the inner diameter and the groove shape of the laminated iron core meet the design precision requirement.
In recent years, with the increasing environmental and energy problems, energy conservation and emission reduction are more and more highly valued by countries in the world, and have become the focus of common attention of all human beings. The motor with the motor-driven generator is used as an extremely important power device in industrial production and people's life, the power consumption of the motor in the global range is up to more than 50% of the total power consumption in the world, and accounts for about 70% of the industrial power consumption, the efficiency of the motor in China is generally lower than that of the motor in developed countries at present, and the efficiency of the motor also has a great promotion space, so that researches on reducing the loss of the motor, improving the efficiency of an electrode and the like are imperative.
In order to improve the efficiency of the motor and reduce the loss, the method generally adopted is to reduce the magnetic flux density of the iron core or use low-loss iron core materials to replace the traditional silicon steel sheets. The magnetic core material commonly used at present is high magnetic induction oriented silicon steel, but the electric power of China is in short supply, and the oriented silicon steel is seriously insufficient. Therefore, it is necessary to adopt a new direction of thought, and besides direct substitution of materials, modification and improvement of the materials themselves are one of the important directions for consideration of research. Moreover, the problems of corrosion, dust falling and the like inevitably occur in the using process of the stator core, so that varnish impregnation needs to be carried out on the stator core in the preparation process, thereby improving the protective effect on the stator core. To this end, the invention provides a stator core with low core loss and a preparation process thereof in consideration of multiple aspects.
Disclosure of Invention
Aiming at the existing problems, the invention provides the automobile engine stator core with low iron loss and the preparation process thereof, the mechanical property and the corrosion resistance of the stator core are effectively improved by comprehensively improving the proportion of the silicon steel sheet body material of the stator core and the surface layer treatment and protection, the stator core has excellent low iron loss rate, the hysteresis loss and the eddy current loss are respectively reduced by 22 percent and 19.3 percent, the comprehensive quality of the stator core is stronger, the economic benefit is effectively improved, and the service life is obviously prolonged.
In order to achieve the above object, the present invention adopts the following technical solutions:
the stator core of the automobile engine with low iron loss is of a multilayer structure and comprises a silicon steel sheet body, a loss reduction outer layer and a protective paint layer which are sequentially designed from inside to outside, wherein the silicon steel sheet body is made of a rare earth borosilicate steel sheet, and the thickness of the silicon steel sheet body is 0.28-0.30 mm; the loss-reducing outer layer is made of composite alloy material, and the thickness of the layer is 0.02-0.04 mm; the protective paint layer is a compound impregnating varnish, and the thickness of the layer is 0.04-0.08 mm.
Preferably, the silicon steel sheet body comprises the following components in percentage by mass: si 1.8-2.2 wt%, RE 0.06-0.1%, B0.05-0.1%, P0.08-0.1%, Mn 0.21-0.23%, Al less than 0.004%, S less than 0.004%, and C less than 0.004%.
Preferably, the composite alloy material comprises iron-cobalt alloy, Fe2Ni alloy, calcium aluminate and copper phosphide, wherein the cobalt content in the iron-cobalt alloy is 48-50 wt%, and 10-15 wt% of the iron source in the iron-containing alloy is from sponge iron.
Preferably, the composite alloy material comprises, by mass, 0.28-0.36% of calcium aluminate, 0.15-0.23% of copper phosphide, 30-40% of Fe2Ni alloy and the balance of iron-cobalt alloy.
Preferably, the preparation method of the composite alloy material comprises the steps of firstly, respectively placing calcium aluminate and copper phosphide in N2Grinding to 1-50 μm under 2Ar mixed atmosphere for later use; respectively hot melting iron-cobalt alloy and Fe2Ni alloy into molten iron, adding micron calcium aluminate into the iron-cobalt alloy for refining for 10-20min, adding micron copper phosphide into the Fe2Ni alloy for refining for 10-20min, then blending the molten iron out of a bag, blending uniformly, and casting to obtain a composite alloy ingot.
Preferably, the compound impregnating varnish comprises the following components in parts by weight: 25-40 parts of epoxy resin coating, 20-30 parts of amino alkyd resin coating, 15-30 parts of water-based polyimide, 1-5 parts of epoxy fatty acid methyl ester, 4-10 parts of curing agent, 2-4 parts of cross-linking agent and 2-5 parts of activating agent.
Preferably, the curing agent is a mixture of zinc naphthenate, diaminodiphenyl sulfone and triethylene tetramine, and the mass ratio of the zinc naphthenate to the diaminodiphenyl sulfone to the triethylene tetramine is 2: 3: 0.3; the cross-linking agent is polydimethylsiloxane, polymethylethoxy siloxane and methyltrimethoxy silane, and the molar ratio of the polydimethylsiloxane to the polymethylethoxy siloxane to the methyltrimethoxy silane is 2:2: 1; the activating agent is ethylene glycol butyl ether acetate and ethylene glycol phenyl ether acetate with the molar ratio of 1: 1.
Preferably, the preparation method of the compound impregnating varnish comprises the steps of taking materials according to parts by weight, stirring and mixing the epoxy resin coating and the amino alkyd resin coating at the temperature of 55-65 ℃, adding the epoxy fatty acid methyl ester, the 1/3 mass cross-linking agent and the 1/2 mass activating agent, continuously stirring and mixing for 10-30min, adding the water-based polyimide, adjusting the temperature to 50 +/-2 ℃, stirring for 5-10min, adding the rest raw materials, stirring for 10-30min under heat preservation, cooling to 40 +/-2 ℃, standing for 1-2h under heat preservation, and naturally cooling to room temperature.
Preferably, the low-iron-loss automobile engine stator core is prepared by sequentially degreasing, washing, pickling, washing and drying a silicon steel sheet body, spraying a composite alloy material on the surface of the silicon steel sheet body by adopting plasma spraying, washing and drying, putting the silicon steel sheet body in composite dipping, carrying out dipping treatment in different times, taking out, drying by hot air and stacking.
Preferably, the multiple impregnation treatment is carried out for 2-4 times, 4-8s each time, and drying is needed after each impregnation to carry out the next impregnation.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: according to the invention, the ratio of the body material of the stator core silicon steel sheet and the surface layer treatment and protection is comprehensively improved, so that the mechanical property and the corrosion resistance of the stator core are effectively improved, the stator core silicon steel sheet has excellent low iron loss rate, the hysteresis loss and the eddy current loss are respectively reduced by 22% and 19.3%, the comprehensive quality of the stator core is stronger, the economic benefit is effectively improved, and the service life is obviously prolonged.
The silicon steel sheet body is added with rare earth, boron, phosphorus, manganese and other elements, and has good matching performance except the effects of deoxidation, decarburization, strengthening and the like which are only possessed by the rare earth during casting, for example, the rare earth forms an intermediate alloy with boron while refining grains, provides nucleation, has good dispersion effect, high metallographic structure uniformity and strong wear resistance, simultaneously the rare earth is subjected to boron-aluminum co-permeation, the hardness deficiency compared with silicon is complemented while the resistivity is improved, and besides the manganese element forms MnS with a harmful element, a proper amount of manganese is combined with the silicon, so that the silicon element has a certain quenching and tempering effect on the inhibition of the grain growth of the silicon element, the mutual promotion and improvement are realized, the addition amount of the silicon element is effectively improved, and the iron loss is reduced.
The loss-reducing outer layer is made of composite alloy materials, and is sprayed by a plasma technology, so that on one hand, the bonding force is good, on the other hand, secondary structure phase change bonding is realized between the loss-reducing outer layer and the surface layer of the silicon steel sheet body in the hot-melt alloy liquid spraying process, the beneficial magnetic function is ensured, meanwhile, the loss-reducing outer layer has a good low expansion coefficient, is a strengthening element of ferrite, the integral hysteresis loss is obviously reduced, and the performance of the magnetic steel is improved. Meanwhile, the wear-resistant and compression-resistant composite material has a mechanical strengthening effect, the wear resistance and the compression strength of the composite material are respectively improved by 2.3 times and 2.1 times, and the effective service life is obviously prolonged.
And finally, the outer paint film is protected, the film forming property is good, the binding force is high, the coating has excellent properties of corrosion resistance, wear resistance, rust prevention, moisture prevention, pollution resistance, insulation and the like, the coating is smooth and compact, and the protection life of the stator core is effectively prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
the stator core of the automobile engine with low iron loss is of a multilayer structure and comprises a silicon steel sheet body, a loss reduction outer layer and a protective paint layer which are sequentially designed from inside to outside, wherein the silicon steel sheet body is a rare earth borosilicate steel sheet, and the thickness of the silicon steel sheet body is 0.28 mm; the loss reduction outer layer is made of composite alloy material, and the thickness of the layer is 0.025 mm; the protective paint layer is a compound impregnating varnish, and the thickness of the layer is 0.06 mm.
The silicon steel sheet body comprises the following components in percentage by mass: si 2.0 wt%, RE 0.06%, B0.1%, P0.1%, Mn 0.22%, Al less than 0.004%, S less than 0.004%, C less than 0.004%.
The composite alloy material comprises iron-cobalt alloy, Fe2Ni alloy, calcium aluminate and copper phosphide, wherein the cobalt content in the iron-cobalt alloy is 48 wt%, and 13 wt% of iron source in the iron-containing alloy is sponge iron; the composite alloy material comprises, by mass, 0.33% of calcium aluminate, 0.18% of copper phosphide, 30% of Fe2Ni alloy and the balance of iron-cobalt alloy. The preparation method of the composite alloy material comprises the steps of respectively adding calcium aluminate and copper phosphide in N2Grinding to 1-50 μm under 2Ar mixed atmosphere for later use; respectively hot melting iron-cobalt alloy and Fe2Ni alloy into molten iron, adding micron calcium aluminate into the iron-cobalt alloy for refining for 20min, adding micron copper phosphide into the Fe2Ni alloy for refining for 10min, then blending the molten iron out of a bag, blending uniformly, and casting to obtain a composite alloy ingot.
The compound impregnating varnish comprises the following components in parts by weight: 35 parts of epoxy resin coating, 25 parts of amino alkyd resin coating, 20 parts of waterborne polyimide, 1 part of epoxy fatty acid methyl ester, 6 parts of curing agent, 3 parts of cross-linking agent and 5 parts of activating agent; the curing agent is a mixture of zinc naphthenate, diaminodiphenyl sulfone and triethylene tetramine, and the mass ratio of the zinc naphthenate to the diaminodiphenyl sulfone to the triethylene tetramine is 2: 3: 0.3; the cross-linking agent is polydimethylsiloxane, polymethylethoxy siloxane and methyltrimethoxy silane, and the molar ratio of the polydimethylsiloxane to the polymethylethoxy siloxane to the methyltrimethoxy silane is 2:2: 1; the activating agent is ethylene glycol butyl ether acetate and ethylene glycol phenyl ether acetate with the molar ratio of 1: 1. The preparation method of the compound impregnating varnish comprises the steps of taking materials according to parts by weight, stirring and mixing an epoxy resin coating and an amino alkyd resin coating at the temperature of 60 ℃, adding epoxy fatty acid methyl ester, a cross-linking agent in the mass of 1/3 and an activating agent in the mass of 1/2, continuously stirring and mixing for 30min, adding water-based polyimide, adjusting the temperature to 50 +/-2 ℃, stirring for 10min, adding the rest raw materials, stirring for 30min under the condition of heat preservation, then cooling to 40 +/-2 ℃, standing for 3h under the condition of heat preservation, and naturally cooling to the room temperature.
The preparation method of the automobile engine stator core with low iron loss comprises the steps of sequentially degreasing, washing, pickling, washing and drying a silicon steel sheet body, then spraying a composite alloy material on the surface of the silicon steel sheet body by adopting plasma spraying, placing the silicon steel sheet body in composite dipping after washing and drying, carrying out immersion treatment in different times, taking out the silicon steel sheet body, drying the silicon steel sheet body by hot air, and stacking the silicon steel sheet body; the multiple dipping treatment is carried out for 3 times, 6s each time, and the next dipping can be carried out only by drying after each dipping.
Example 2:
the stator core of the automobile engine with low iron loss is of a multilayer structure and comprises a silicon steel sheet body, a loss reduction outer layer and a protective paint layer which are sequentially designed from inside to outside, wherein the silicon steel sheet body is a rare earth borosilicate steel sheet, and the thickness of the silicon steel sheet body is 0.28 mm; the loss reduction outer layer is made of composite alloy material, and the thickness of the layer is 0.03 mm; the protective paint layer is a compound impregnating varnish, and the thickness of the layer is 0.04 mm.
The silicon steel sheet body comprises the following components in percentage by mass: si 1.8 wt%, RE 0.1%, B0.07%, P0.08%, Mn 0.23%, Al less than 0.004%, S less than 0.004%, and C less than 0.004%.
The composite alloy material comprises iron-cobalt alloy, Fe2Ni alloy, calcium aluminate and copper phosphide, wherein the cobalt content in the iron-cobalt alloy is 48 wt%, and 15 wt% of iron source in the iron-containing alloy is sponge iron; the composite alloy material comprises, by mass, 0.36% of calcium aluminate, 0.23% of copper phosphide, 30% of Fe2Ni alloy and the balance of iron-cobalt alloy. The preparation method of the composite alloy material comprises the steps of respectively adding calcium aluminate and copper phosphide in N2Grinding to 1-50 μm under 2Ar mixed atmosphere for later use; respectively hot melting iron-cobalt alloy and Fe2Ni alloy into molten iron, adding micron calcium aluminate into the iron-cobalt alloy for refining for 20min, adding micron copper phosphide into the Fe2Ni alloy for refining for 20min, then blending the molten iron out of a bag, blending uniformly, and casting to obtain a composite alloy ingot.
The compound impregnating varnish comprises the following components in parts by weight: 25 parts of epoxy resin coating, 25 parts of amino alkyd resin coating, 20 parts of waterborne polyimide, 2 parts of epoxy fatty acid methyl ester, 8 parts of curing agent, 3 parts of cross-linking agent and 4 parts of activating agent; the curing agent is a mixture of zinc naphthenate, diaminodiphenyl sulfone and triethylene tetramine, and the mass ratio of the zinc naphthenate to the diaminodiphenyl sulfone to the triethylene tetramine is 2: 3: 0.3; the cross-linking agent is polydimethylsiloxane, polymethylethoxy siloxane and methyltrimethoxy silane, and the molar ratio of the polydimethylsiloxane to the polymethylethoxy siloxane to the methyltrimethoxy silane is 2:2: 1; the activating agent is ethylene glycol butyl ether acetate and ethylene glycol phenyl ether acetate with the molar ratio of 1: 1. The preparation method of the compound impregnating varnish comprises the steps of taking materials according to parts by weight, stirring and mixing an epoxy resin coating and an amino alkyd resin coating at the temperature of 65 ℃, adding epoxy fatty acid methyl ester, a cross-linking agent in the mass of 1/3 and an activating agent in the mass of 1/2, continuously stirring and mixing for 20min, adding water-based polyimide, adjusting the temperature to 50 +/-2 ℃, stirring for 10min, adding the rest raw materials, stirring for 10min under the condition of heat preservation, then cooling to 40 +/-2 ℃, standing for 2h under the condition of heat preservation, and naturally cooling to room temperature.
The preparation method of the automobile engine stator core with low iron loss comprises the steps of sequentially degreasing, washing, pickling, washing and drying a silicon steel sheet body, then spraying a composite alloy material on the surface of the silicon steel sheet body by adopting plasma spraying, placing the silicon steel sheet body in composite dipping after washing and drying, carrying out immersion treatment in different times, taking out the silicon steel sheet body, drying the silicon steel sheet body by hot air, and stacking the silicon steel sheet body; the multiple dipping treatment is carried out for 2 times, 6s each time, and the next dipping can be carried out only by drying after each dipping.
Example 3:
the stator core of the automobile engine with low iron loss is of a multilayer structure and comprises a silicon steel sheet body, a loss reduction outer layer and a protective paint layer, wherein the silicon steel sheet body is a rare earth borosilicate steel sheet, and the thickness of the silicon steel sheet body is 0.30 mm; the loss reduction outer layer is made of composite alloy material, and the thickness of the layer is 0.04 mm; the protective paint layer is a compound impregnating varnish, and the thickness of the layer is 0.06 mm.
The silicon steel sheet body comprises the following components in percentage by mass: si 1.8 wt%, RE 0.06%, B0.06%, P0.08%, Mn 0.23%, Al less than 0.004%, S less than 0.004%, C less than 0.004%.
The composite alloy material comprises iron-cobalt alloy, Fe2Ni alloy and aluminumCalcium phosphate and copper phosphide, wherein the cobalt content in the iron-cobalt alloy is 48 wt%, and 10 wt% of iron source in the iron-containing alloy is sponge iron; the composite alloy material comprises, by mass, 0.28% of calcium aluminate, 0.23% of copper phosphide, 30% of Fe2Ni alloy and the balance of iron-cobalt alloy. The preparation method of the composite alloy material comprises the steps of respectively adding calcium aluminate and copper phosphide in N2Grinding to 1-50 μm under 2Ar mixed atmosphere for later use; respectively hot melting iron-cobalt alloy and Fe2Ni alloy into molten iron, adding micron calcium aluminate into the iron-cobalt alloy for refining for 10min, adding micron copper phosphide into the Fe2Ni alloy for refining for 10min, then blending the molten iron out of a bag, blending uniformly, and casting to obtain a composite alloy ingot.
The compound impregnating varnish comprises the following components in parts by weight: 40 parts of epoxy resin coating, 20 parts of amino alkyd resin coating, 20 parts of waterborne polyimide, 3 parts of epoxy fatty acid methyl ester, 10 parts of curing agent, 2 parts of cross-linking agent and 4 parts of activating agent; the curing agent is a mixture of zinc naphthenate, diaminodiphenyl sulfone and triethylene tetramine, and the mass ratio of the zinc naphthenate to the diaminodiphenyl sulfone to the triethylene tetramine is 2: 3: 0.3; the cross-linking agent is polydimethylsiloxane, polymethylethoxy siloxane and methyltrimethoxy silane, and the molar ratio of the polydimethylsiloxane to the polymethylethoxy siloxane to the methyltrimethoxy silane is 2:2: 1; the activating agent is ethylene glycol butyl ether acetate and ethylene glycol phenyl ether acetate with the molar ratio of 1: 1. The preparation method of the compound impregnating varnish comprises the steps of taking materials according to parts by weight, stirring and mixing an epoxy resin coating and an amino alkyd resin coating at the temperature of 65 ℃, adding epoxy fatty acid methyl ester, a cross-linking agent in the mass of 1/3 and an activating agent in the mass of 1/2, continuously stirring and mixing for 20min, adding water-based polyimide, adjusting the temperature to 50 +/-2 ℃, stirring for 10min, adding the rest raw materials, stirring for 20min under the condition of heat preservation, then cooling to 40 +/-2 ℃, standing for 2h under the condition of heat preservation, and naturally cooling to room temperature.
The preparation method of the automobile engine stator core with low iron loss comprises the steps of sequentially degreasing, washing, pickling, washing and drying a silicon steel sheet body, then spraying a composite alloy material on the surface of the silicon steel sheet body by adopting plasma spraying, placing the silicon steel sheet body in composite dipping after washing and drying, carrying out immersion treatment in different times, taking out the silicon steel sheet body, drying the silicon steel sheet body by hot air, and stacking the silicon steel sheet body; the multiple dipping treatment is specifically dipping times of 2 times, each time for 5s, and the next dipping can be carried out only by drying after each dipping.
Example 4:
the stator core of the automobile engine with low iron loss is of a multilayer structure and comprises a silicon steel sheet body, a loss reduction outer layer and a protective paint layer, wherein the silicon steel sheet body is a rare earth borosilicate steel sheet, and the thickness of the silicon steel sheet body is 0.30 mm; the loss reduction outer layer is made of composite alloy material, and the thickness of the layer is 0.03 mm; the protective paint layer is a compound impregnating varnish, and the thickness of the layer is 0.05 mm.
The silicon steel sheet body comprises the following components in percentage by mass: si 1.8 wt%, RE 0.06%, B0.05%, P0.1%, Mn 0.22%, Al less than 0.004%, S less than 0.004%, C less than 0.004%.
The composite alloy material comprises an iron-cobalt alloy, a Fe2Ni alloy, calcium aluminate and copper phosphide, wherein the cobalt content in the iron-cobalt alloy is 50 wt%, and 15 wt% of iron source in the iron-containing alloy is sponge iron; the composite alloy material comprises, by mass, 0.35% of calcium aluminate, 0.15% of copper phosphide, 30-40% of Fe2Ni alloy and the balance of iron-cobalt alloy. The preparation method of the composite alloy material comprises the steps of respectively adding calcium aluminate and copper phosphide in N2Grinding to 1-50 μm under 2Ar mixed atmosphere for later use; respectively hot melting iron-cobalt alloy and Fe2Ni alloy into molten iron, adding micron calcium aluminate into the iron-cobalt alloy for refining for 20min, adding micron copper phosphide into the Fe2Ni alloy for refining for 20min, then blending the molten iron out of a bag, blending uniformly, and casting to obtain a composite alloy ingot.
The compound impregnating varnish comprises the following components in parts by weight: 25 parts of epoxy resin coating, 30 parts of amino alkyd resin coating, 15 parts of waterborne polyimide, 2 parts of epoxy fatty acid methyl ester, 4 parts of curing agent, 4 parts of cross-linking agent and 2 parts of activating agent; the curing agent is a mixture of zinc naphthenate, diaminodiphenyl sulfone and triethylene tetramine, and the mass ratio of the zinc naphthenate to the diaminodiphenyl sulfone to the triethylene tetramine is 2: 3: 0.3; the cross-linking agent is polydimethylsiloxane, polymethylethoxy siloxane and methyltrimethoxy silane, and the molar ratio of the polydimethylsiloxane to the polymethylethoxy siloxane to the methyltrimethoxy silane is 2:2: 1; the activating agent is ethylene glycol butyl ether acetate and ethylene glycol phenyl ether acetate with the molar ratio of 1: 1. The preparation method of the compound impregnating varnish comprises the steps of taking materials according to parts by weight, stirring and mixing an epoxy resin coating and an amino alkyd resin coating at the temperature of 60 ℃, adding epoxy fatty acid methyl ester, a cross-linking agent in the mass of 1/3 and an activating agent in the mass of 1/2, continuously stirring and mixing for 20min, adding water-based polyimide, adjusting the temperature to 50 +/-2 ℃, stirring for 10min, adding the rest raw materials, stirring for 30min under the condition of heat preservation, then cooling to 40 +/-2 ℃, standing for 2h under the condition of heat preservation, and naturally cooling to the room temperature.
The preparation method of the automobile engine stator core with low iron loss comprises the steps of sequentially degreasing, washing, pickling, washing and drying a silicon steel sheet body, then spraying a composite alloy material on the surface of the silicon steel sheet body by adopting plasma spraying, placing the silicon steel sheet body in composite dipping after washing and drying, carrying out immersion treatment in different times, taking out the silicon steel sheet body, drying the silicon steel sheet body by hot air, and stacking the silicon steel sheet body; the multiple dipping treatment is specifically dipping times of 2 times, each time for 8s, and the next dipping can be carried out only by drying after each dipping.
Example 5:
the stator core of the automobile engine with low iron loss is of a multilayer structure and comprises a silicon steel sheet body, a loss reduction outer layer and a protective paint layer which are sequentially designed from inside to outside, wherein the silicon steel sheet body is a rare earth borosilicate steel sheet, and the thickness of the silicon steel sheet body is 0.28 mm; the loss reduction outer layer is made of composite alloy material, and the thickness of the layer is 0.04 mm; the protective paint layer is a compound impregnating varnish, and the thickness of the layer is 0.06 mm.
The silicon steel sheet body comprises the following components in percentage by mass: si 2.0 wt%, RE 0.06%, B0.09%, P0.08%, Mn 0.21%, Al less than 0.004%, S less than 0.004%, C less than 0.004%.
The composite alloy material comprises iron-cobalt alloy, Fe2Ni alloy, calcium aluminate and copper phosphide, wherein the cobalt content in the iron-cobalt alloy is 48 wt%, and 15 wt% of iron source in the iron-containing alloy is sponge iron; the composite alloy material comprises, by mass, 0.32% of calcium aluminate, 0.22% of copper phosphide, 30% of Fe2Ni alloy and the balance of iron-cobalt alloy. The preparation method of the composite alloy material comprises the steps of respectively adding calcium aluminate and copper phosphide in N2Grinding to 1-50 μm under 2Ar mixed atmosphere for later use; respectively hot-melting iron-cobalt alloy and Fe2Ni alloy into molten iron, and meltingAnd adding the meter-grade calcium aluminate into the iron-cobalt alloy for refining for 10min, adding the meter-grade copper phosphide into the Fe2Ni alloy for refining for 15min, then blending molten iron out of a bag, uniformly blending, and casting to obtain a composite alloy ingot.
The compound impregnating varnish comprises the following components in parts by weight: 35 parts of epoxy resin coating, 20 parts of amino alkyd resin coating, 15 parts of waterborne polyimide, 2 parts of epoxy fatty acid methyl ester, 8 parts of curing agent, 3 parts of cross-linking agent and 5 parts of activating agent; the curing agent is a mixture of zinc naphthenate, diaminodiphenyl sulfone and triethylene tetramine, and the mass ratio of the zinc naphthenate to the diaminodiphenyl sulfone to the triethylene tetramine is 2: 3: 0.3; the cross-linking agent is polydimethylsiloxane, polymethylethoxy siloxane and methyltrimethoxy silane, and the molar ratio of the polydimethylsiloxane to the polymethylethoxy siloxane to the methyltrimethoxy silane is 2:2: 1; the activating agent is ethylene glycol butyl ether acetate and ethylene glycol phenyl ether acetate with the molar ratio of 1: 1. The preparation method of the compound impregnating varnish comprises the steps of taking materials according to parts by weight, stirring and mixing an epoxy resin coating and an amino alkyd resin coating at 55 ℃, adding epoxy fatty acid methyl ester, a cross-linking agent in the mass of 1/3 and an activating agent in the mass of 1/2, continuously stirring and mixing for 30min, adding water-based polyimide, adjusting the temperature to 50 +/-2 ℃, stirring for 5min, adding the rest raw materials, stirring for 30min under heat preservation, then cooling to 40 +/-2 ℃, standing for 1h under heat preservation, and naturally cooling to room temperature.
The preparation method of the automobile engine stator core with low iron loss comprises the steps of sequentially degreasing, washing, pickling, washing and drying a silicon steel sheet body, then spraying a composite alloy material on the surface of the silicon steel sheet body by adopting plasma spraying, placing the silicon steel sheet body in composite dipping after washing and drying, carrying out immersion treatment in different times, taking out the silicon steel sheet body, drying the silicon steel sheet body by hot air, and stacking the silicon steel sheet body; the multiple dipping treatment is specifically dipping for 4 times, each time for 4s, and the next dipping can be carried out only by drying after each dipping.
Example 6:
the stator core of the automobile engine with low iron loss is of a multilayer structure and comprises a silicon steel sheet body, a loss reduction outer layer and a protective paint layer which are sequentially designed from inside to outside, wherein the silicon steel sheet body is a rare earth borosilicate steel sheet, and the thickness of the silicon steel sheet body is 0.28 mm; the loss reduction outer layer is made of composite alloy material, and the thickness of the layer is 0.03 mm; the protective paint layer is a compound impregnating varnish, and the thickness of the layer is 0.08 mm.
The silicon steel sheet body comprises the following components in percentage by mass: si 1.8 wt%, RE 0.07%, B0.05%, P0.08%, Mn 0.22%, Al less than 0.004%, S less than 0.004%, C less than 0.004%.
The composite alloy material comprises an iron-cobalt alloy, a Fe2Ni alloy, calcium aluminate and copper phosphide, wherein the cobalt content in the iron-cobalt alloy is 50 wt%, and 12.7 wt% of iron source in the iron-containing alloy comes from sponge iron; the composite alloy material comprises, by mass, 0.28% of calcium aluminate, 0.15% of copper phosphide, 40% of Fe2Ni alloy and the balance of iron-cobalt alloy. The preparation method of the composite alloy material comprises the steps of respectively adding calcium aluminate and copper phosphide in N2Grinding to 1-50 μm under 2Ar mixed atmosphere for later use; respectively hot melting iron-cobalt alloy and Fe2Ni alloy into molten iron, adding micron calcium aluminate into the iron-cobalt alloy for refining for 10-20min, adding micron copper phosphide into the Fe2Ni alloy for refining for 10-20min, then blending the molten iron out of a bag, blending uniformly, and casting to obtain a composite alloy ingot.
The compound impregnating varnish comprises the following components in parts by weight: 30 parts of epoxy resin coating, 30 parts of amino alkyd resin coating, 120 parts of waterborne polyimide, 3 parts of epoxy fatty acid methyl ester, 10 parts of curing agent, 2 parts of cross-linking agent and 3 parts of activating agent; the curing agent is a mixture of zinc naphthenate, diaminodiphenyl sulfone and triethylene tetramine, and the mass ratio of the zinc naphthenate to the diaminodiphenyl sulfone to the triethylene tetramine is 2: 3: 0.3; the cross-linking agent is polydimethylsiloxane, polymethylethoxy siloxane and methyltrimethoxy silane, and the molar ratio of the polydimethylsiloxane to the polymethylethoxy siloxane to the methyltrimethoxy silane is 2:2: 1; the activating agent is ethylene glycol butyl ether acetate and ethylene glycol phenyl ether acetate with the molar ratio of 1: 1. The preparation method of the compound impregnating varnish comprises the steps of taking materials according to parts by weight, stirring and mixing the epoxy resin coating and the amino alkyd resin coating at the temperature of 60 ℃, adding the epoxy fatty acid methyl ester, the crosslinking agent in the mass of 1/3 and the activating agent in the mass of 1/2, continuously stirring and mixing for 20min, adding the water-based polyimide, adjusting the temperature to 50 +/-2 ℃, stirring for 10min, adding the rest raw materials, stirring for 20min under the condition of heat preservation, then cooling to 40 +/-2 ℃, standing for 1.5h under the condition of heat preservation, and naturally cooling to the room temperature.
The preparation method of the automobile engine stator core with low iron loss comprises the steps of sequentially degreasing, washing, pickling, washing and drying a silicon steel sheet body, then spraying a composite alloy material on the surface of the silicon steel sheet body by adopting plasma spraying, placing the silicon steel sheet body in composite dipping after washing and drying, carrying out immersion treatment in different times, taking out the silicon steel sheet body, drying the silicon steel sheet body by hot air, and stacking the silicon steel sheet body; the multiple dipping treatment is carried out for 3 times, 5s each time, and the next dipping can be carried out only by drying after each dipping.
The product prepared by the embodiment of the invention is subjected to performance test, wherein the comparative example 1 is a pure silicon steel sheet body; the comparative example 2 is a silicon steel sheet body and a loss reduction outer layer; comparative example 3 is a silicon steel sheet body + protective paint layer; the data are as follows:
wherein, table 1 shows the corrosion resistance and wear resistance; table 2 shows the iron loss case;
moisture and heat resistance: adopting a damp-heat test box, wherein the temperature is 45 ℃, the relative humidity is 98%, and observing the time/h required for the phenomena of foaming, flash point, whitening and the like;
salt spray resistance: adopting 5% sodium chloride solution, adding acetic acid to adjust the pH value to 3.8-4.0 to form acid salt mist, placing the stator core coated with varnish in the acid salt mist, and observing the time required for the stator core to generate phenomena of bubbling, flash point, whitening and the like,/h;
alkali resistance: soaking the stator core coated with the varnish in 3% sodium hydroxide solution, and observing the time required for the stator core to appear the phenomena of whitening, light loss, foaming, falling and the like,/h;
acid resistance: soaking the stator core coated with varnish in 3% hydrogen chloride solution, and observing the time required for the stator core to appear the phenomena of whitening, light loss, foaming, falling and the like,/h;
table 1:
| salt spray resistance, h | Acid resistance h | Alkali resistance, h | Resistance to humidity and heat, h | |
| Example 1 | 53 | 58 | 60 | 1035 |
| Example 2 | 52 | 56 | 58 | 1055 |
| Example 3 | 56 | 57 | 59 | 1042 |
| Example 4 | 52 | 55 | 58 | 1030 |
| Example 5 | 53 | 58 | 61 | 1063 |
| Example 6 | 55 | 59 | 61 | 1057 |
Table 2:
the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a low iron loss's automobile engine stator core which characterized in that: the stator core is of a multilayer structure and comprises a silicon steel sheet body, a loss reduction outer layer and a protective paint layer which are sequentially designed from inside to outside, wherein the silicon steel sheet body is a rare earth borosilicate steel sheet, and the thickness of the silicon steel sheet body is 0.28-0.30 mm; the loss-reducing outer layer is made of composite alloy material, and the thickness of the layer is 0.02-0.04 mm; the protective paint layer is a compound impregnating varnish, and the thickness of the layer is 0.04-0.08 mm.
2. The low core loss automotive engine stator core of claim 1, wherein: the silicon steel sheet body comprises the following components in percentage by mass: si 1.8-2.2 wt%, RE 0.06-0.1%, B0.05-0.1%, P0.08-0.1%, Mn 0.21-0.23%, Al less than 0.004%, S less than 0.004%, and C less than 0.004%.
3. The low core loss automotive engine stator core of claim 1, wherein: the composite alloy material comprises iron-cobalt alloy, Fe2Ni alloy, calcium aluminate and copper phosphide, wherein the cobalt content in the iron-cobalt alloy is 48-50 wt%, and 10-15 wt% of iron source in the iron-containing alloy is sponge iron.
4. The low core loss automotive engine stator core of claim 3, wherein: the composite alloy material comprises, by mass, 0.28-0.36% of calcium aluminate, 0.15-0.23% of copper phosphide, 30-40% of Fe2Ni alloy and the balance of iron-cobalt alloy.
5. The low-core-loss stator core for an automobile engine as claimed in claim 4, wherein the composite alloy material is prepared by first adding calcium aluminate and copper phosphide to N2Grinding to 1-50 μm under 2Ar mixed atmosphere for later use; respectively hot melting iron-cobalt alloy and Fe2Ni alloy into molten iron, adding micron calcium aluminate into the iron-cobalt alloy for refining for 10-20min, adding micron copper phosphide into the Fe2Ni alloy for refining for 10-20min, then blending the molten iron out of a bag, blending uniformly, and casting to obtain a composite alloy ingot.
6. The low core loss automotive engine stator core of claim 1, wherein: the compound impregnating varnish comprises the following components in parts by weight: 25-40 parts of epoxy resin coating, 20-30 parts of amino alkyd resin coating, 15-30 parts of water-based polyimide, 1-5 parts of epoxy fatty acid methyl ester, 4-10 parts of curing agent, 2-4 parts of cross-linking agent and 2-5 parts of activating agent.
7. The low core loss automotive engine stator core of claim 6, wherein: the curing agent is a mixture of zinc naphthenate, diaminodiphenyl sulfone and triethylene tetramine, and the mass ratio of the zinc naphthenate to the diaminodiphenyl sulfone to the triethylene tetramine is 2: 3: 0.3; the cross-linking agent is polydimethylsiloxane, polymethylethoxy siloxane and methyltrimethoxy silane, and the molar ratio of the polydimethylsiloxane to the polymethylethoxy siloxane to the methyltrimethoxy silane is 2:2: 1; the activating agent is ethylene glycol butyl ether acetate and ethylene glycol phenyl ether acetate with the molar ratio of 1: 1.
8. The automobile engine stator core with low iron loss according to claim 7, wherein the compound impregnating varnish is prepared by taking materials according to parts by weight, stirring and mixing an epoxy resin coating and an amino alkyd resin coating at 55-65 ℃, adding epoxy fatty acid methyl ester, a crosslinking agent in the mass of 1/3 and an activating agent in the mass of 1/2, continuously stirring and mixing for 10-30min, adding water-based polyimide, adjusting the temperature to 50 +/-2 ℃, stirring for 5-10min, adding the rest raw materials, stirring for 10-30min at a heat preservation temperature, then cooling to 40 +/-2 ℃, standing for 1-2h at a heat preservation temperature, and naturally cooling to room temperature.
9. The low core loss automotive engine stator core according to any one of claims 1 to 8, characterized in that: the preparation method comprises the steps of sequentially degreasing, washing with water, pickling, washing with water, drying, spraying the composite alloy material on the surface of the silicon steel sheet body by plasma spraying, cleaning, drying, placing in composite impregnation, performing impregnation treatment in multiple times, taking out, drying with hot air, and stacking.
10. The low core loss automotive engine stator core of claim 10, wherein: the multiple dipping treatment is carried out for 2-4 times, each time for 4-8s, and the next dipping can be carried out only by drying after each dipping.
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Application publication date: 20200424 |