CN112885593A - Heat treatment method for high-precision current sensor magnetic core - Google Patents
Heat treatment method for high-precision current sensor magnetic core Download PDFInfo
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- CN112885593A CN112885593A CN202110124954.3A CN202110124954A CN112885593A CN 112885593 A CN112885593 A CN 112885593A CN 202110124954 A CN202110124954 A CN 202110124954A CN 112885593 A CN112885593 A CN 112885593A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 title claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 9
- 239000000956 alloy Substances 0.000 claims abstract description 9
- 238000004321 preservation Methods 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 17
- 229910001020 Au alloy Inorganic materials 0.000 abstract description 6
- 239000003353 gold alloy Substances 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000002159 nanocrystal Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005415 magnetization Effects 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
- H01F41/022—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) by winding the strips or ribbons around a coil
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment method for a magnetic core of a high-precision current sensor, which comprises the following steps: winding a nanocrystalline alloy strip into a magnetic core with a magnetic path length larger than 8 cm; placing the magnetic core in a vacuum environment, carrying out heat treatment at the temperature of 150-700 ℃ for 10-1200 minutes, and cooling the magnetic core subjected to heat treatment at normal temperature for 10-60 minutes; and step three, applying a transverse magnetic field to the magnetic core, wherein the duration time of the transverse magnetic field is 10-150 minutes, the magnetic field intensity of the transverse magnetic field is 50-1500 Gs, simultaneously preserving the heat at 150-500 ℃ for 10-120 minutes, and cooling the magnetic core after heat preservation for 10-60 minutes at normal temperature. The invention has the beneficial effects that: the initial permeability mu i of the nano gold alloy magnetic core is improved to be more than 180000, which is improved by 60 percent compared with the initial permeability of the existing nano crystal alloy product with the same magnetic field length of more than 8cm, thereby effectively improving the measurement precision level of the current sensor.
Description
Technical Field
The invention relates to the technical field of magnetic core heat treatment, in particular to a high-precision current sensor magnetic core heat treatment method.
Background
The power battery system is a core part of a new energy vehicle, wherein the SOC (state of charge) calculation of a battery pack is one of key technologies, and not only influences the accuracy of the endurance mileage, but also relates to the safety and the service life of the whole battery pack; the battery pack is prevented from being affected by overcharge and overdischarge, so that accurate determination of the SOC is very important, and the measurement accuracy of the current sensor is a direct factor for accurately determining the SOC.
At present, the initial magnetic permeability of the nano gold alloy magnetic core of the traditional current sensor on the market is insufficient, so that the measurement accuracy of the current sensor cannot meet the requirement well.
Disclosure of Invention
In order to solve the problems, the invention provides a heat treatment method for a high-precision current sensor magnetic core, which mainly solves the problem of insufficient initial permeability of a nano gold alloy magnetic core.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a heat treatment method for a high-precision current sensor magnetic core comprises the following steps:
winding a nanocrystalline alloy strip into a magnetic core with a magnetic path length larger than 8 cm;
secondly, placing the magnetic core in a furnace, vacuumizing, carrying out heat treatment at 150-700 ℃ for 10-1200 minutes, and cooling the magnetic core subjected to heat treatment at normal temperature for 10-60 minutes;
and step three, applying a transverse magnetic field to the magnetic core, wherein the duration time of the transverse magnetic field is 10-150 minutes, the magnetic field intensity of the transverse magnetic field is 50-1500 Gs, simultaneously preserving the heat at 150-500 ℃ for 10-120 minutes, and cooling the magnetic core after heat preservation for 10-60 minutes at normal temperature.
The invention has the beneficial effects that: the initial permeability mu i of the nano gold alloy magnetic core is improved to be more than 180000, which is improved by 60 percent compared with the initial permeability of the existing nano crystal alloy product with the same magnetic field length of more than 8cm, thereby effectively improving the measurement precision level of the current sensor.
Drawings
FIG. 1 is a schematic illustration of the static hysteresis loop and the basic magnetization curve of a heat treated magnetic core;
fig. 2 is a schematic diagram of the basic magnetization curve and permeability curve of a heat-treated magnetic core.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the following detailed description of the present invention is provided with reference to the accompanying drawings and detailed description. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
The embodiment provides a heat treatment method for a high-precision current sensor magnetic core, which comprises the following steps:
winding a nanocrystalline alloy strip into a magnetic core with a magnetic path length larger than 8 cm;
secondly, placing the magnetic core in a furnace, vacuumizing, carrying out heat treatment at 150-700 ℃ for 10-1200 minutes, and cooling the magnetic core subjected to heat treatment at normal temperature for 10-60 minutes;
and step three, applying a transverse magnetic field to the magnetic core, wherein the duration time of the transverse magnetic field is 10-150 minutes, the magnetic field intensity of the transverse magnetic field is 50-1500 Gs, simultaneously preserving the heat at 150-500 ℃ for 10-120 minutes, and cooling the magnetic core after heat preservation for 10-60 minutes at normal temperature.
As shown in fig. 1 and 2, the initial permeability μ i of the nano-gold alloy magnetic core after the heat treatment is raised to 180000(180k) or more.
The initial permeability mu i of the nano gold alloy magnetic core after the heat treatment is improved to be more than 180000(180K), which is improved by 60 percent compared with the initial permeability of the conventional nano crystal alloy product with the same magnetic field length of more than 8cm, thereby effectively improving the measurement precision level of the current sensor.
The specific implementation principle is as follows:
the implementation principle and the process background of the invention refer to the specific magnetization process of a magnetic substance, and a transverse magnetic field corresponding to a corresponding product is provided in the production to enable the material to be magnetized in a reversible segment in three stages (reversible segment → part of reversible segment → completion of irreversible segment) from a zero magnetization state to a saturated magnetization curve, so that the magnetic domain structure and magnetic anisotropy are changed, and the magnetic permeability is further improved;
example one
Winding a nanocrystalline alloy strip into a magnetic core with a magnetic path length of 8 cm;
secondly, placing the magnetic core in a furnace, vacuumizing, carrying out heat treatment at 150 ℃ for 10 minutes, and cooling the magnetic core subjected to heat treatment for 10 minutes at normal temperature;
and step three, applying a transverse magnetic field to the magnetic core, wherein the duration time of the transverse magnetic field is 10 minutes, the magnetic field intensity of the transverse magnetic field is 50Gs, simultaneously preserving the heat at 150 ℃ for 10 minutes, and cooling the magnetic core after heat preservation for 10 minutes at normal temperature.
Example two
Winding a nanocrystalline alloy strip into a magnetic core with a magnetic path length of 8 cm;
secondly, placing the magnetic core in a furnace, vacuumizing, performing heat treatment at 700 ℃ for 1200 minutes, and cooling the magnetic core subjected to heat treatment for 60 minutes at normal temperature;
and step three, applying a transverse magnetic field to the magnetic core, wherein the duration time of the transverse magnetic field is 150 minutes, the magnetic field intensity of the transverse magnetic field is 1500Gs, simultaneously preserving the heat at 500 ℃ for 120 minutes, and cooling the magnetic core after heat preservation for 60 minutes at normal temperature.
Description of the test:
1. test results under different processes
Remarking: the materials, equipment and production batches used in the above tests are all quantitative, and the only variable is the annealing process.
The average value of initial permeability μ i obtained in the process of example one was 194K, and the average value of initial permeability μ i obtained in the process of example two was 164K.
Comparative process 1: only adopting the first step and the second step of the implementation process; the third process step is not implemented, and the average value of the obtained initial magnetic permeability mu i is 94K;
comparative process 2: adopting the first step and the second step of the implementation process; performing transverse magnetic field annealing at a temperature outside the range of 150-500 ℃ in the third step without changing other parameters, wherein the average value of the obtained initial permeability mu i is 114K;
comparative process 3: adopting the first step and the second step of the implementation process; performing transverse magnetic field annealing by adopting the magnetic field intensity outside the range of 50-1500 Gs in the process magnetic field intensity in the third step, wherein other parameters in the third step are unchanged, and the average value of the obtained initial magnetic permeability mu i is 112K;
comparative process 4: adopting the first step and the second step of the implementation process; and (3) carrying out transverse magnetic field annealing by adopting the process in the third step, wherein the transverse magnetic field duration is outside the interval of 10-15 minutes, other parameters in the third step are unchanged, and the average value of the obtained initial permeability mu i is 125K.
2. Example results of different test batches under one Process
Remarking: the process used in the tests is quantitative, and the same grade of material is adopted, and different test batches are tested
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (1)
1. A heat treatment method for a high-precision current sensor magnetic core is characterized by comprising the following steps:
winding a nanocrystalline alloy strip into a magnetic core with a magnetic path length larger than 8 cm;
secondly, placing the magnetic core in a furnace, vacuumizing, carrying out heat treatment at 150-700 ℃ for 10-1200 minutes, and cooling the magnetic core subjected to heat treatment in the furnace for 10-60 minutes;
and step three, applying a transverse magnetic field to the magnetic core, wherein the duration time of the transverse magnetic field is 10-150 minutes, the magnetic field intensity of the transverse magnetic field is 50-1500 Gs, simultaneously preserving the heat at 150-500 ℃ for 10-120 minutes, and cooling the magnetic core after heat preservation for 10-60 minutes at normal temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110124954.3A CN112885593A (en) | 2021-01-29 | 2021-01-29 | Heat treatment method for high-precision current sensor magnetic core |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110124954.3A CN112885593A (en) | 2021-01-29 | 2021-01-29 | Heat treatment method for high-precision current sensor magnetic core |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105702408A (en) * | 2016-03-15 | 2016-06-22 | 徐亚红 | Preparation method of nanocrystalline soft magnetic material |
| CN109706290A (en) * | 2019-01-14 | 2019-05-03 | 杭州曼德新材料有限公司 | A kind of nanocrystalline magnet core magnetic field heat treatment process protected suitable for the leakage of A type |
| CN111354560A (en) * | 2020-03-20 | 2020-06-30 | 杭州曼德新材料有限公司 | Heat treatment method of common-mode inductance nanocrystalline magnetic core |
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2021
- 2021-01-29 CN CN202110124954.3A patent/CN112885593A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105702408A (en) * | 2016-03-15 | 2016-06-22 | 徐亚红 | Preparation method of nanocrystalline soft magnetic material |
| CN109706290A (en) * | 2019-01-14 | 2019-05-03 | 杭州曼德新材料有限公司 | A kind of nanocrystalline magnet core magnetic field heat treatment process protected suitable for the leakage of A type |
| CN111354560A (en) * | 2020-03-20 | 2020-06-30 | 杭州曼德新材料有限公司 | Heat treatment method of common-mode inductance nanocrystalline magnetic core |
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Application publication date: 20210601 |