CN114724840B - Annealing process for solving balance characteristic iron core of residual current transformer - Google Patents
Annealing process for solving balance characteristic iron core of residual current transformer Download PDFInfo
- Publication number
- CN114724840B CN114724840B CN202210466814.9A CN202210466814A CN114724840B CN 114724840 B CN114724840 B CN 114724840B CN 202210466814 A CN202210466814 A CN 202210466814A CN 114724840 B CN114724840 B CN 114724840B
- Authority
- CN
- China
- Prior art keywords
- iron core
- temperature
- annular
- furnace
- minutes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000000137 annealing Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 21
- 229910000808 amorphous metal alloy Inorganic materials 0.000 claims abstract description 28
- 230000001681 protective effect Effects 0.000 claims abstract description 17
- 238000011049 filling Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 239000010935 stainless steel Substances 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000010941 cobalt Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 238000011068 loading method Methods 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 239000003292 glue Substances 0.000 abstract description 9
- 239000011261 inert gas Substances 0.000 abstract description 7
- 230000035699 permeability Effects 0.000 abstract description 7
- 239000000956 alloy Substances 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 10
- 229920002379 silicone rubber Polymers 0.000 description 6
- 229910000976 Electrical steel Inorganic materials 0.000 description 5
- 238000004590 computer program Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 239000004944 Liquid Silicone Rubber Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005381 magnetic domain Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000013598 vector Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention provides an annealing process for solving the problem of balance characteristic iron cores of residual current transformers, which comprises the following operation steps: a protective box setting step, namely manufacturing the amorphous alloy into an annular iron core and putting the annular iron core into a protective box; a furnace feeding step, namely placing the protection box into a furnace with the pressure less than a set value and filling inert gas into the furnace; the high temperature treatment step, firstly heating from normal temperature to first temperature and keeping, then heating to second temperature and keeping, finally cooling to third temperature, wherein the size relation among the three temperatures is as follows: the third temperature < the first temperature < the second temperature; discharging, namely discharging when the temperature in the furnace is stabilized at the third temperature; and (3) glue filling, namely glue filling and curing in the protective box. The invention can avoid the generation of internal stress of the iron core and reduce the influence on the magnetic permeability of the iron core.
Description
Technical Field
The invention relates to the technical field of manufacturing processes of transformers, in particular to an annealing process for solving the problem of balance characteristic iron cores of residual current transformers.
Background
The existing transformer manufacturing process comprises the steps of preparing a silicon steel sheet iron core and a nanocrystalline alloy iron core together, such as a preparation method of a current transformer iron core with the application number of CN 202110275421.5;
A1, obtaining a silicon steel sheet iron core;
the preparation method of the silicon steel sheet iron core comprises the following steps:
s1, winding a silicon steel sheet strip material into an annular iron core according to design requirements, and forming a raw material iron core after high-temperature annealing;
S2, immersing the annular iron core in an epoxy resin/curing agent mixed solution under a vacuum environment, taking out, curing, and naturally cooling to room temperature;
s3, performing unilateral incision treatment on the annular iron core by using linear cutting processing equipment, and selecting the diameter of the molybdenum wire according to different products;
S4, cleaning and drying the annular iron core;
S5, according to the width dimension of the designed notch, selecting an insulating and shaping material with corresponding thickness to be added into the notch, wherein the size is the same as the cross section of the iron core; the special nonmagnetic stainless steel ribbon and the matched tension adjustable fastening equipment thereof are designed, the stainless steel ribbon is sleeved on the outer circular surface of the notched iron core in a pair, the stainless steel ribbon is tensioned by the fastening equipment, and the two end surfaces of the notch are pressed on the shaping material, so that the shaping material cannot be pulled out and is not deformed into a standard by compression;
s6, welding the joint parts of the two ends of the stainless steel ribbon firmly by using resistance welding equipment, and fixing the size of the air gap at the notch part of the iron core.
A2, obtaining a nanocrystalline alloy iron core;
The preparation method of the nanocrystalline alloy core comprises the following steps:
K1, winding a closed alloy iron core by adopting a formula-improved 1K107 nanocrystalline alloy material, and obtaining an alloy iron core body with higher initial magnetic conductivity by optimizing the temperature and time of an annealing process;
K2, designing an aluminum alloy protection box with a proper size, placing the annealed alloy iron core body at the bottom of the aluminum alloy protection box, encapsulating liquid silicone rubber until the liquid silicone rubber exceeds the upper end surface of the iron core, and naturally solidifying the liquid silicone rubber into high-elasticity solid;
and A3, loading the processed silicon steel sheet iron core into the upper part of the aluminum alloy protective box, and encapsulating the liquid silicon rubber again until the liquid silicon rubber is close to the upper edge of the aluminum alloy protective box, and naturally solidifying the liquid silicon rubber into high-elasticity solid.
The manufacturing process comprises the steps of firstly carrying out annealing operation on the iron core, brushing glue on the iron core after the iron core is annealed, and solidifying at room temperature.
The relationship between the magnetic permeability U and the magnetization Ms, the magnetocrystalline anisotropy constant K and the saturation magnetostriction coefficient λs of the magnetic material is as follows: U.alpha.Ms 2/Kλs, i.e. permeability U is inversely proportional to magnetocrystalline anisotropy constant K, saturation magnetostriction coefficient λs.
In the process of curing the iron core at room temperature, as the temperature in the furnace is greatly different from the room temperature, the temperature difference is large, so that stress can be generated in the iron core, the saturation magnetostriction coefficient lambdas and the magnetocrystalline anisotropy constant K of the iron core are changed, and the magnetic conductivity of the iron core is reduced.
Disclosure of Invention
The invention aims to provide an annealing process for solving the problem of iron cores with balance characteristics of residual current transformers, which can avoid the generation of internal stress of the iron cores and reduce the influence on the magnetic permeability of the iron cores.
Therefore, the annealing process for solving the balance characteristic iron core of the residual current transformer comprises the following operation steps:
a protective box setting step, namely manufacturing the amorphous alloy into an annular iron core and putting the annular iron core into a protective box;
a glue filling step, namely glue filling is carried out in the protective box, the protective box is placed in a furnace with the pressure less than a set value, and inert gas is filled in the furnace;
A high-temperature curing step, namely heating from normal temperature to a first temperature and keeping, then heating to a second temperature and keeping, and finally cooling to a third temperature, wherein the size relationship among the three temperatures is as follows: the third temperature < the first temperature < the second temperature;
And discharging the furnace when the temperature in the furnace is the third temperature.
Further, the protection box setting step further comprises an iron core manufacturing step, wherein the iron core manufacturing step is to wind the strip-shaped amorphous alloy into an annular iron core, and the inner diameter value and the outer diameter value of the annular iron core are preset values.
Further, the ribbon-shaped amorphous alloy winding mode is that the ribbon-shaped amorphous alloy is wound into a multi-layer structure from a preset inner diameter until the outer diameter of the annular iron core reaches a preset outer diameter value.
Further, the air gap between the layers of ribbon-shaped amorphous alloy is smaller than the thickness of the single sheet of ribbon-shaped amorphous alloy.
Further, the ratio between the second temperature and the first temperature is 1.1, and the ratio between the third temperature and the second temperature is 0.39.
Further, the high-temperature curing step further comprises: heating from normal temperature to first temperature at time A, heating to second temperature at time B, cooling to third temperature at time C, wherein the three times have the following size relations: time B < time C < time a.
Further, the ratio between time a and time B is 2.5, and the ratio between time B and time C is 0.5.
Further, the ratio between the holding time of the first temperature and the holding time of the second temperature is 0.75.
Further, the protection box is rectangular stainless steel protection box, the stainless steel protection box is provided with an opening for placing the annular iron core, the annular iron core is placed into the stainless steel protection box from the opening, one side wall of the annular iron core is attached to the bottom surface of the opening of the stainless steel protection box, the plane of the other side wall of the annular iron core is lower than the top surface of the opening of the stainless steel protection box, the distance between the side wall of the annular iron core, which is close to the opening, and the top surface of the opening is a distance a, the distance between the inner diameter of the annular iron core and any one corner in the inner wall of the stainless steel protection box is a distance d, and the ratio between the distance a and the distance d is 1.67.
Further, the glue filling step specifically comprises the following steps: vacuumizing the furnace until the pressure in the furnace reaches a set value of the pressure, filling inert gas at a set flow rate, and circularly blasting air in the furnace until the temperature in the furnace is uniformly distributed.
The beneficial effects are that:
The invention provides an annealing process for solving the balance characteristic iron core of a residual current transformer, wherein, as an annular iron core is amorphous alloy and the amorphous alloy does not have magnetocrystalline anisotropy K basically, the magnetic conductivity U of the annular iron core is almost only related to a saturated magnetostriction coefficient lambda s, the annular iron core is made of amorphous alloy, the annular iron core is put into a protection box, then the protection box is put into a furnace with the pressure less than a set value, inert gas is filled into the furnace, the annular iron core in the protection box is processed through the temperature in the furnace for a plurality of times, the annular integral stress reaches balance, and the magnetic conductivity of the annular iron core is not reduced under the condition that a new saturated magnetostriction coefficient lambda s does not appear in the annular iron core.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a flow chart of a control program for an annealing process for solving the balance characteristic iron core of a residual current transformer in the invention;
fig. 2 is a schematic structural view of the annular iron core placed in the protection box;
FIG. 3 is a graph showing the effects of the annealing method according to the present embodiment and the conventional annealing method on the saturation magnetostriction coefficient λs, respectively;
FIG. 4 is a schematic diagram of an electronic device according to the present invention;
fig. 5 is a schematic structural view of a computer readable storage medium of the present invention.
Reference numerals illustrate: 1-a toroidal core; 2-protecting the box; a 21-processor; 22-memory; 23-storage space; 24-program code; 31-program code.
Detailed Description
The invention will be further described with reference to the following examples.
Referring to fig. 1, the annealing process for solving the balance characteristic iron core of the residual current transformer in this embodiment includes the following steps: a protective box 2 setting step, namely manufacturing an amorphous alloy into an annular iron core 1 and putting the annular iron core into the protective box 2; a furnace charging step, namely placing the protection box 2 into a furnace with the pressure less than a set value and charging inert gas into the furnace; the high temperature treatment step, firstly heating from normal temperature to first temperature and keeping, then heating to second temperature and keeping, finally cooling to third temperature, wherein the size relation among the three temperatures is as follows: the third temperature < the first temperature < the second temperature; discharging, namely discharging when the temperature in the furnace is stabilized at the third temperature; and (3) glue filling, namely glue filling and curing in the protective box 2. Wherein, because the annular iron core 1 is amorphous alloy, but the amorphous alloy does not have magnetocrystalline anisotropy K in essence, the magnetic conductivity U of the annular iron core 1 is almost only related to the saturation magnetostriction coefficient λs, the annular iron core 1 is made of amorphous alloy, the annular iron core 1 is put into a protection box, then the protection box is put into a furnace with the pressure less than a set value, inert gas is filled into the furnace, the annular iron core 1 in the protection box is processed through the temperature in the furnace for a plurality of times, the whole stress of the annular iron core 1 reaches balance, and the magnetic conductivity of the annular iron core 1 is not reduced under the condition that the new saturation magnetostriction coefficient λs does not appear in the annular iron core 1.
Further, an annular iron core manufacturing step is further provided before the protective box 2 setting step, the annular iron core manufacturing step is to wind the strip-shaped amorphous alloy into an annular iron core 1, and the inner diameter value and the outer diameter value of the annular iron core 1 are both preset values.
Further, the ribbon-shaped amorphous alloy winding mode is to wind the ribbon-shaped amorphous alloy into a multi-layer structure from a preset inner diameter until the outer diameter of the annular iron core 1 reaches a preset outer diameter value.
Further, the air gap between the layers of ribbon-shaped amorphous alloy is smaller than the thickness of the single sheet of ribbon-shaped amorphous alloy.
Further, the shape of the protection box 2 is annular, an annular groove is formed in the protection box, the annular iron cores 1 are embedded into the annular groove in an opposite mode, and the protection box 2 is rectangular.
See fig. 2, because the transformer with smaller volume needs to be manufactured, the annular iron core 1 is rectangular, and each angle of the rectangle is a chamfer angle R, and the annular iron core 1 and the protection box 2 are made into rectangular structures so as to reduce the space occupied by the iron core and the protection box 2, thereby reducing the volume of the transformer.
Further, the opening is adapted to the structure of the annular iron core 1, the annular iron core 1 is placed into the stainless steel protection box 2 from the opening, one side wall of the annular iron core is attached to the bottom surface of the opening of the stainless steel protection box 2, the plane of the other side wall of the annular iron core 1 is lower than the top surface of the opening of the stainless steel protection box 2, the distance between the side wall of the annular iron core, which is close to the opening, and the top surface of the opening is the distance a, the distance between the inner diameter of the annular iron core 1 and any one of the angles in the inner wall of the stainless steel protection box 2 is the distance d, and the ratio between the distance a and the distance d is 1.67.
Further, the step of setting the protection box 2 further includes an iron core manufacturing step, wherein the iron core manufacturing step is to wind the strip-shaped amorphous alloy into the annular iron core 1, and the inner diameter value and the outer diameter value of the annular iron core 1 are both preset values.
Further, the ribbon-shaped amorphous alloy winding mode is to wind the ribbon-shaped amorphous alloy into a multi-layer structure from a preset inner diameter until the outer diameter of the annular iron core 1 reaches a preset outer diameter value.
Further, the air gap between the layers of ribbon-shaped amorphous alloy is smaller than the thickness of the single sheet of ribbon-shaped amorphous alloy.
Further, the ratio between the second temperature and the first temperature is 1.1, and the ratio between the third temperature and the second temperature is 0.39.
Further, the high-temperature curing step further comprises: heating from normal temperature to first temperature at time A, heating to second temperature at time B, cooling to third temperature at time C, wherein the three times have the following size relations: time B < time C < time a.
Further, the ratio between time a and time B is 2.5, and the ratio between time B and time C is 0.5.
Further, the ratio between the holding time of the first temperature and the holding time of the second temperature is 0.75.
Further, the glue filling step specifically comprises the following steps: vacuumizing the furnace until the pressure in the furnace reaches a set value of the pressure, filling inert gas at a set flow rate, and circularly blasting air in the furnace until the temperature in the furnace is uniformly distributed.
The specific method comprises the following steps:
1. Winding an amorphous strip material containing cobalt (Fe72.82Co0.68Nb3Si13.5B9) into an annular iron core 1 according to the required inner diameter and the stacking thickness;
2. The annular iron core 1 is arranged in a rectangular stainless steel protection box 2, the height of the iron core is required to be lower than the empty height of the protection box 2 by <5mm (distance a), and the inner diameter R angles of the iron core are more than 3mm (distance b) away from the inner wall of the protection box 2, so that after the heat treatment iron core is contracted, the inner diameter perimeter of the iron core is not smaller than the inner diameter perimeter of the protection box 2, and the stress cannot be released;
3. Placing the iron core in a furnace, vacuumizing for 10 minutes, ensuring the pressure in the furnace to be less than-0.02 MPa, closing a vacuumizing valve, and filling nitrogen into the furnace with the flow of about 2L/min;
4. And (3) high-temperature treatment: firstly, 150 minutes (time A) is used for rising from normal temperature to 480 ℃ (first temperature), heat is preserved for 90 minutes, after the first heat preservation is finished, then 60 minutes (time B) is used for rising to 560 ℃ (second temperature), heat is preserved again for 120 minutes, after the heat preservation is finished, 90 minutes is used for reducing the temperature to 420 ℃ and magnetizing for 20 minutes, and finally 30 minutes is used for reducing the temperature to 50 ℃ (third temperature) for discharging, because experiments show that rapid cooling can cause internal stress, and λs cannot be reduced while high magnetic conductivity cannot be ensured.
The magnetic field based annealing has the following effect on the saturation magnetostriction coefficient:
the saturation magnetostriction coefficient lambda s is taken as a structural sensitivity and is an important factor influencing the initial permeability of the alloy, and the relationship can be expressed as Where μ 0 is the vacuum permeability, σ is the residual tension, < K > is the effective anisotropy, and M S is the saturation magnetization.
During the magnetic field annealing process, the external magnetic field induces uniaxial anisotropy along the direction of the alloy strip, magnetization vectors tend to align along the direction of the external magnetic field, the original magnetic domains are continuously approaching to 180 degrees, the outside temperature is lowered, and the magnetic domain walls approaching 180 degrees are fixed. The sample after annealing of the magnetic field is placed in an external magnetic field along the axis of the alloy ribbon and this 180 degree domain wall movement that is frozen out will dominate the change in magnetization vector. The 180-degree domain wall movement has little contribution to magnetostriction, almost no larger magnetostriction is caused, and the reduction of the magnetostriction degree of the nanocrystalline alloy after the annealing of the visible magnetic field is caused by the fact.
Meanwhile, the stress of each position in the conventional round iron core is the same, so that the stress balance is ensured, in order to reduce the volume of the transformer, the annular iron core 1 is manufactured into a rectangle with chamfer R angles, the rectangle is provided with 4 straight edges and 4R angles, the stress difference between the R angles and the straight edges is more, the integral stress unbalance of the iron core is caused, the balance characteristic of the iron core is influenced, and in order to improve the balance characteristic of the rectangular iron core with the chamfer R angles in the embodiment, the high-temperature processing step is adopted.
5. After nitrogen is filled, the internal circulation fan is started in the whole process, so that the temperature and atmosphere in the whole furnace are ensured to be uniform.
Through the annealing operation, the maximum magnetic permeability U of the annular iron core 1 is obtained, and meanwhile, the saturation magnetostriction coefficient lambda s of the annular iron core is minimum, so that the stability of the transformer is improved. Referring to fig. 3, the effect of the annealing method of the present embodiment on the saturation magnetostriction coefficient λs compared with the conventional annealing method is shown in the following table 1:
Table 1
It should be noted that:
the method according to the present embodiment can be implemented by being transferred to a program step and a device that can be stored in a computer storage medium, and being called and executed by a controller.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus for the purpose of disclosing the best mode of practicing the invention.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.
Various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functions of some or all of the components in an apparatus for detecting the wearing state of an electronic device according to an embodiment of the present invention may be implemented in practice using a microprocessor or Digital Signal Processor (DSP). The present invention can also be implemented as an apparatus or device program (e.g., a computer program and a computer program product) for performing a portion or all of the methods described herein. Such a program embodying the present invention may be stored on a computer readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
For example, fig. 4 shows a schematic structural diagram of an electronic device according to an embodiment of the present invention. The electronic device conventionally comprises a processor 21 and a memory 22 arranged to store computer executable instructions (program code). The memory 22 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. The memory 22 has a memory space 23 storing program code 24 for performing any of the method steps in the embodiments. For example, the memory space 23 for the program code may include individual program code 24 for implementing the various steps in the above method, respectively. The program code can be read from or written to one or more computer program products. These computer program products comprise a program code carrier such as a hard disk, a Compact Disc (CD), a memory card or a floppy disk. Such a computer program product is typically a computer readable storage medium as described for example in fig. 5. The computer readable storage medium may have memory segments, memory spaces, etc. arranged similarly to the memory 22 in the electronic device of fig. 4. The program code may be compressed, for example, in a suitable form. Typically, the memory unit stores program code 31 for performing the method steps according to the invention, i.e. program code readable by a processor such as 21, which when run by an electronic device causes the electronic device to perform the steps in the method described above.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
Claims (5)
1. An annealing process for solving the problem of balance characteristic iron cores of residual current transformers is characterized by comprising the following operation steps:
The manufacturing step of the iron core, namely winding the strip-shaped amorphous alloy containing cobalt into an annular iron core according to the preset inner diameter required by stacking thickness;
the method comprises the step of setting a protective box, namely, loading an annular iron core into a rectangular stainless steel protective box, wherein the difference between the height of the annular iron core and the empty height in the protective box is less than 5mm, and the distance between the R angles of 4 inner diameters of the annular iron core and the inner wall of the protective box is more than 3mm;
Placing an iron core in a furnace, vacuumizing for 10 minutes, ensuring the pressure in the furnace to be less than-0.02 MPa, closing a vacuumizing valve, and filling nitrogen;
A high-temperature treatment step, namely, firstly raising the temperature from normal temperature to 480 ℃ for 150 minutes, preserving the heat for 90 minutes, firstly raising the temperature to 560 ℃ for 60 minutes after finishing the heat preservation, and then preserving the heat for 120 minutes again, after finishing the heat preservation, lowering the temperature to 420 ℃ for 90 minutes, adding magnetism for 20 minutes, and finally, cooling to 50 ℃ for more than 30 minutes, and discharging;
After nitrogen is filled, the internal circulation fan is started in the whole process, so that the temperature and atmosphere in the whole furnace are ensured to be uniform.
2. The annealing process for solving the balance characteristic iron core of the residual current transformer according to claim 1, wherein the ribbon-shaped amorphous alloy is wound in a multi-layer structure from a preset inner diameter until the outer diameter of the annular iron core reaches a preset outer diameter value.
3. The annealing process for solving the balance characteristic iron core of the residual current transformer according to claim 2, wherein the air gap between the layers of the ribbon-shaped amorphous alloy is smaller than the thickness of the single ribbon-shaped amorphous alloy.
4. The annealing process for solving the problem of balance characteristic iron cores of residual current transformers according to claim 1, wherein the shape of the protection box is annular, an annular groove is formed in the protection box, and the annular iron cores are oppositely embedded in the annular groove.
5. The annealing process for solving the problem of balance characteristic iron cores of residual current transformers according to claim 1, wherein the toroidal iron core is rectangular, and each corner of the rectangle is a chamfer R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466814.9A CN114724840B (en) | 2022-04-29 | 2022-04-29 | Annealing process for solving balance characteristic iron core of residual current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466814.9A CN114724840B (en) | 2022-04-29 | 2022-04-29 | Annealing process for solving balance characteristic iron core of residual current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114724840A CN114724840A (en) | 2022-07-08 |
| CN114724840B true CN114724840B (en) | 2024-05-28 |
Family
ID=82245846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210466814.9A Active CN114724840B (en) | 2022-04-29 | 2022-04-29 | Annealing process for solving balance characteristic iron core of residual current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114724840B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6345318A (en) * | 1986-08-12 | 1988-02-26 | Daihen Corp | Partially heat insulated annealing method of amorphous alloy |
| CN102361374A (en) * | 2011-10-28 | 2012-02-22 | 安泰科技股份有限公司 | Protective box type amorphous, microcrystal or nano-crystal alloy stator core for motor and preparation method thereof |
| CN106298218A (en) * | 2015-06-11 | 2017-01-04 | 上海煦韵电子科技有限公司 | A kind of rectangle amorphous nano-crystalline magnetic core and preparation method thereof |
| CN107345265A (en) * | 2017-06-22 | 2017-11-14 | 东莞市大忠电子有限公司 | A kind of annealing process for the remanent magnetism for reducing nanocrystalline magnet core |
| CN112927914A (en) * | 2021-01-21 | 2021-06-08 | 广州金磁海纳新材料科技有限公司 | Preparation method of high-permeability iron-based nanocrystalline magnetically soft alloy magnetic core |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004024337A1 (en) * | 2004-05-17 | 2005-12-22 | Vacuumschmelze Gmbh & Co. Kg | Process for producing nanocrystalline current transformer cores, magnetic cores produced by this process, and current transformers with same |
-
2022
- 2022-04-29 CN CN202210466814.9A patent/CN114724840B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6345318A (en) * | 1986-08-12 | 1988-02-26 | Daihen Corp | Partially heat insulated annealing method of amorphous alloy |
| CN102361374A (en) * | 2011-10-28 | 2012-02-22 | 安泰科技股份有限公司 | Protective box type amorphous, microcrystal or nano-crystal alloy stator core for motor and preparation method thereof |
| CN106298218A (en) * | 2015-06-11 | 2017-01-04 | 上海煦韵电子科技有限公司 | A kind of rectangle amorphous nano-crystalline magnetic core and preparation method thereof |
| CN107345265A (en) * | 2017-06-22 | 2017-11-14 | 东莞市大忠电子有限公司 | A kind of annealing process for the remanent magnetism for reducing nanocrystalline magnet core |
| CN112927914A (en) * | 2021-01-21 | 2021-06-08 | 广州金磁海纳新材料科技有限公司 | Preparation method of high-permeability iron-based nanocrystalline magnetically soft alloy magnetic core |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114724840A (en) | 2022-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Luborsky et al. | Magnetic annealing of amorphous alloys | |
| US7861403B2 (en) | Current transformer cores formed from magnetic iron-based alloy including final crystalline particles and method for producing same | |
| US6737951B1 (en) | Bulk amorphous metal inductive device | |
| US4364020A (en) | Amorphous metal core laminations | |
| JP2011171772A (en) | Gapped amorphous metal-based magnetic core | |
| CN101167145A (en) | Iron-based high saturation induction amorphous alloy | |
| KR20180067760A (en) | Method for producing rare earth permanent magnet | |
| CN114724840B (en) | Annealing process for solving balance characteristic iron core of residual current transformer | |
| US20130106559A1 (en) | Method of reducing audible noise in magnetic cores and magnetic cores having reduced audible noise | |
| Negri et al. | Magnetic aging effect losses on electrical steels | |
| US5494534A (en) | Method of heat treating an amorphous soft magnetic article | |
| US6621399B2 (en) | Powder core and high-frequency reactor using the same | |
| Bertotti et al. | Reversible and irreversible magnetization in soft iron‐based polycrystalline materials | |
| CN114678203A (en) | Manufacturing process and medium for solving balance characteristic of residual current transformer | |
| CN110352464B (en) | Magnetic core unit, current transformer, and method for manufacturing the same | |
| US2147791A (en) | Magnetic material having low hysteresis losses | |
| US3125472A (en) | Process for the production of magnetic materials | |
| CN115351429B (en) | Iron-based amorphous and nanocrystalline preparation method | |
| RU2038640C1 (en) | Choke | |
| CN109727764A (en) | A kind of manufacture craft of laminated magnetic core | |
| JPS59158504A (en) | Magnetic core | |
| Frost et al. | Evaluation of magnetic materials for static inverters and converters | |
| Gavrilyuk et al. | Effect of temperature on the Δ E effect in Fe75Si10B15 amorphous metallic wires | |
| JP4688029B2 (en) | Core for common mode choke coil and manufacturing method thereof | |
| CA2337653A1 (en) | Magnetic core insulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |